OzVMX Forum

Marque Remarks => Yamaha => Topic started by: YZ250H on February 12, 2012, 07:39:01 pm

Title: What's going on with this ?
Post by: YZ250H on February 12, 2012, 07:39:01 pm
Obviously a mod, but what is the shock from and why would you do it  :-\

(http://i202.photobucket.com/albums/aa49/tbarsby/010.jpg)
(http://i202.photobucket.com/albums/aa49/tbarsby/007-3.jpg)
(http://i202.photobucket.com/albums/aa49/tbarsby/009-1.jpg)
Title: Re: What's going on with this ?
Post by: maico police on February 12, 2012, 07:45:41 pm
I'd say it's not the standard shock for the bike and that bit on the end is to make up the difference. I had the same thing on the 80 J that I bought. Beware other such modification..... ::)
Title: Re: What's going on with this ?
Post by: YZ250H on February 12, 2012, 08:02:41 pm
thanks Ross,

Thankfully whoever did it had the good sense to make it removable  8)

I will give it a chance as it is and see how it goes.  250C shocks don't exactly grow on trees ::)
Title: Re: What's going on with this ?
Post by: motomaniac on February 12, 2012, 08:05:14 pm
You need to show the other end of the shock but Im calling it a DT shock , similar to later yz 's but no dampening adjuster on the shaft
Title: Re: What's going on with this ?
Post by: Iain Cameron on February 12, 2012, 08:09:27 pm
Yeh the YZB /C and mx b's shock had a long shaft though the end and two nuts and 3or2 rubber bushes the shock in the photo looks like a 77 plus dt shock ( no adjustment )
Iain
Title: Re: What's going on with this ?
Post by: YZ250H on February 12, 2012, 08:18:35 pm
It does have some sort of weird adjustment as per below  :-\

regardless of all that it certainly isn't a C shock as there is no reservoir anywhere to be seen

(http://i202.photobucket.com/albums/aa49/tbarsby/011-2.jpg)
Title: Re: What's going on with this ?
Post by: David Lahey on February 12, 2012, 08:31:06 pm
That one will make an almighty bang if it bottoms out. The standard YZC shock uses the rubber mounting cushions at the front end to absorb the impact when the shock bottoms (spring coils all touch when it bottoms). That set up in the photo has no cushion on the mounting or on the shock shaft so something may well bend if it ever bottoms hard.
Title: Re: What's going on with this ?
Post by: YZ250H on February 12, 2012, 08:35:54 pm
I see Walter has one for sale.  I will investigate that ;).

Would be good to know what the other one is as it works very well and is in very good nick.  No leaks or rust on the shaft.
Title: Re: What's going on with this ?
Post by: steveo247 on February 12, 2012, 09:10:03 pm
pretty sure dad has a surplus rear shock he may let go!

i dont know what that is, but it looks like a few years later model yz80 to me.
Title: Re: What's going on with this ?
Post by: steveo247 on February 12, 2012, 09:14:20 pm
as for why would you do it.

becuase the rear shocks would have been really hard to come by before the internet was around, and it would have been easier/cheaper to make that one fit rather than get the correct item. or fix the correct item.

and as you would likely know -
here is the standard setup (tho the 125 version)
(http://i389.photobucket.com/albums/oo331/steveophotos/yz125x/barscontrolseft.jpg)

FWIW this is 125X shock on top and 125C model on bottom
(http://i389.photobucket.com/albums/oo331/steveophotos/yz125x/shock3.jpg)
Title: Re: What's going on with this ?
Post by: mainline on February 12, 2012, 10:27:58 pm
Obviously a mod, but what is the shock from and why would you do it  :-\

(http://i202.photobucket.com/albums/aa49/tbarsby/010.jpg)
(http://i202.photobucket.com/albums/aa49/tbarsby/007-3.jpg)
(http://i202.photobucket.com/albums/aa49/tbarsby/009-1.jpg)

considering the bastardry seen on other resto's/paddock bashers, that mod seems rather well engineering by comparison. I'm not saying you should chrome plate it (as you've been known to do) just saying it's not complete shite relatively speaking
Title: Re: What's going on with this ?
Post by: Nathan S on February 13, 2012, 01:05:47 pm
As motomaniac said, 99% sure that's a DT125/175 monoshock shock. That IS a dampening adjustment, but I've never felt any difference, even when they weren't seized solid.

DT250/400 monoshocks have a wider top/front mount, I think.
Title: Re: What's going on with this ?
Post by: Rossvickicampbell on February 13, 2012, 04:16:17 pm
if you get stuck the Works Performance MX B (?) shocks fit the YZ Bs with only a small mod.

cheers
Title: Re: What's going on with this ?
Post by: YZ250H on February 13, 2012, 05:22:46 pm
Looking for YZC Rosco, so it should go straight on.
Title: Re: What's going on with this ?
Post by: KB171 on February 13, 2012, 07:27:12 pm
Gday Tony, this blokes got a couple for sale ATM 75 and 76,
Cheers KB

http://www.ebay.com.au/itm/VINTAGE-1976-YZ-Yamaha-250-400-mono-shock-REBUILT-/290668565470?pt=Motorcycles_Parts_Accessories&hash=item43ad3253de

http://www.ebay.com.au/itm/VINTAGE-1975-MX-YZ-Yamaha-250-360-400-mono-shock-REBUILT-/250991725863?pt=Motorcycles_Parts_Accessories&hash=item3a7045cd27
Title: Re: What's going on with this ?
Post by: Viper666 on February 13, 2012, 08:59:33 pm
YZ100G, I have one!  Actually two! The shock I mean.

They are in other models, just cant remember what?

YZ100H, IT125G/H

Very similar to YZ100E/F but they dont have the locking ring (14).

Looks like a heavier spring from something else?


  (http://i989.photobucket.com/albums/af17/Viper_666/YZ100G-HIT125G-H-1.gif) (http://i989.photobucket.com/albums/af17/Viper_666/YZ100E-F.gif)
Title: Re: What's going on with this ?
Post by: Nathan S on February 14, 2012, 08:03:37 pm
I assume that you can't read the prefix on the sticker?

Title: Re: What's going on with this ?
Post by: Viper666 on February 15, 2012, 12:10:54 am

What sticker? What prefix?
Title: Re: What's going on with this ?
Post by: Viper666 on February 15, 2012, 12:33:51 am
It is not a dampening adjustment, it is preload. Thus the locking ring. If you like I'll take a photo of the 2 I have with the 3R9 prefix  (IT125G) or 3R2 (YZ100G) I cant remember

Did I miss something or is this a contest?

Thought we were adding our 2 cents?

I realise the shock may be in other models but I know it is in a YZ100G.

The list of the same or similar parts that Yamaha use in other models use is endless.
Title: Re: What's going on with this ?
Post by: YZ250H on February 15, 2012, 06:52:04 am
Thanks Viper.  Hopefully it is the same one on the 100H (that I don't have yet) so I will have a spare shock.
This one is in very good condition.

The hunt continues for a good 250C shock.  I will follow up those leads KB and Rossco and see what I can come up with.

Cheers lads  8)
Title: Re: What's going on with this ?
Post by: Nathan S on February 15, 2012, 11:25:31 am
Neale, I was asking Tony. You can see a remnant of the sticker in his most recent photo, but you can also see that it's torn and has probably been painted over.
Relax!  :)

And you're right about the adjustment - my bad.
Title: Re: What's going on with this ?
Post by: Viper666 on February 15, 2012, 12:08:59 pm
Sorry, misread. But they are not the shocks in the 1st pics? Which one is Tony?
Title: Re: What's going on with this ?
Post by: Viper666 on February 15, 2012, 12:14:20 pm

By the way I have a set of C forks for sale. Have got round to posting yet.

Good chrome no rust or pitting, straight, seem to be intact & working. Legs need attention (Polishing etc.)

One is misiing the bolt that srews into the lower leg at the bottom.

Have pics somewhere will post tonight if I get time.
Title: Re: What's going on with this ?
Post by: YZ250H on February 15, 2012, 01:06:50 pm
Tony is me  ;D ;D

Thanks Viper, the set of forks I have on the bike are in good nick.  That's one thing I am OK for.  A lot of other stuff I will still need to source.

I will have a look at the sticker to see if the model is still on it Nathan.  Would have been the obvious thing to look at in hindsight  ::)
Title: Re: What's going on with this ?
Post by: YZ250H on February 17, 2012, 10:02:12 am
Gday Tony, this blokes got a couple for sale ATM 75 and 76,
Cheers KB

http://www.ebay.com.au/itm/VINTAGE-1976-YZ-Yamaha-250-400-mono-shock-REBUILT-/290668565470?pt=Motorcycles_Parts_Accessories&hash=item43ad3253de


On it's way thanks KB
Title: Re: What's going on with this ?
Post by: KB171 on February 17, 2012, 10:22:53 am
No worries Tony, glad to help.
Title: Re: What's going on with this ?
Post by: YZ250H on February 19, 2012, 06:00:24 pm
Now it seems the swing arm is all wrong too ... CRAP  >:(

While I have the attention of the older model Yamaha Gurus.  What is this arm off ?

Has the snail cam adjusters.  No bearing etc for the swingarm pivot like the YZ, just bushes.
(http://i202.photobucket.com/albums/aa49/tbarsby/006-4.jpg)
(http://i202.photobucket.com/albums/aa49/tbarsby/005-4.jpg)
(http://i202.photobucket.com/albums/aa49/tbarsby/004-5.jpg)

Anyone got the real thing laying around, or know where I would find one  ???
Title: Re: What's going on with this ?
Post by: vandy010 on February 19, 2012, 06:40:10 pm
at a quick guess,
DT400D
Title: Re: What's going on with this ?
Post by: Nathan S on February 19, 2012, 07:26:40 pm
The steel arms had bushes - thry only went to bearings for the alloy arms.

I reckon Vany's nailed it - monoshock DT250/400. Shock would probably be from the same bike.
Title: Re: What's going on with this ?
Post by: YZ250H on February 19, 2012, 07:46:26 pm
The steel arms had bushes - thry only went to bearings for the alloy arms.

I reckon Vany's nailed it - monoshock DT250/400. Shock would probably be from the same bike.

That's odd.  The yammy parts diagram shows bearings and all sorts in the swingarm pivot  :-\.

So that makes the swingarm I have worth absolutely nothing and puts me on a search for the correct one ::).

This project is starting to become frustrating  >:(

Edit : having looked at some parts diagrams, I reckon DT400D is very close to the mark, right down to the bushes (only) in the swingarm pivot.
Even the shock looks pretty close  :-\  Maybe someone has grafted the DT400D onto the back of this beast  :-\  Brake backing plate matches the swingarm also - something else to locate  >:(
Title: Re: What's going on with this ?
Post by: mainline on February 19, 2012, 08:06:59 pm
Maybe GMC could make you a chrome swingarm?
Title: Re: What's going on with this ?
Post by: GMC on February 19, 2012, 08:41:37 pm
Maybe GMC could make you a chrome swingarm?

Would he want it to suit just one model do you think or would he want it designed from several different models to match the bike??
Title: Re: What's going on with this ?
Post by: YZ250H on February 19, 2012, 09:07:26 pm
 :D :D :D
Title: Re: What's going on with this ?
Post by: vandy010 on February 19, 2012, 11:19:37 pm
Edit : having looked at some parts diagrams, I reckon DT400D is very close to the mark, right down to the bushes (only) in the swingarm pivot.
Even the shock looks pretty close  :-\  Maybe someone has grafted the DT400D onto the back of this beast  :-\  Brake backing plate matches the swingarm also - something else to locate  >:(
or did they just put a YZ tank onto a Monoshock DT and you fell hook line and sinker?
just a thought. ???
Title: Re: What's going on with this ?
Post by: YZ250H on February 20, 2012, 09:32:27 am
Frame and motor numbers are 509- .......   :-\
Title: Re: What's going on with this ?
Post by: Marc.com on February 20, 2012, 10:54:00 am
Maybe GMC could make you a chrome swingarm?

Just chrome what you have, and then slip it into an XL250 chassis  ;) they fit like a glove

(http://i245.photobucket.com/albums/gg71/marcFX_photo/MarcsFrame012.jpg)
Title: Re: What's going on with this ?
Post by: Ted on February 20, 2012, 05:52:06 pm
Buy a canoe...no moving parts ;)
Title: Re: What's going on with this ?
Post by: KB171 on February 20, 2012, 09:29:38 pm
(http://i39.tinypic.com/2enqna1.jpg)

Is this what your sposed to have Tony?
Title: Re: What's going on with this ?
Post by: mainline on February 20, 2012, 10:00:46 pm
(http://i39.tinypic.com/2enqna1.jpg)

Is this what your sposed to have Tony?


except his has the optional girder forks from a 1937 Excelsior
Title: Re: What's going on with this ?
Post by: YZ250H on February 21, 2012, 06:56:28 am
Yeah, that's the one KB.  The numbers on the frame and the motor are correct.  i have the forks with the Tacho and Speedo.   I've even got the bars with the high cross bar.

Looks like someone has done a dodgy with the swingarm and shock >:(.  I've got  a shock on the way (thanks for finding it).

Need a swingarm and a brake backing plate.  Or I could just use what I have and clobber all the train spotters that point out that the swingarm and backing plate is wrong  ;D :o
Title: Re: What's going on with this ?
Post by: GMC on February 21, 2012, 08:19:13 am
I think this is the backing plate, bloody hard to tell sometimes with the official part names

Part # = 483-25321-00-98
Part Description = PLATE,BRAKE SHOE
Model Count = 9
IT400C 1976 400 IT400 Dual-Purpose
MX250B 1975 250 MX250 Off-Road
MX400B 1975 400 MX400 Off-Road
TT500C 1976 500 TT500 Off-Road
TT500D 1977 500 TT500 Off-Road
YZ250B 1975 250 YZ250 Competition Motocross
YZ250C 1976 250 YZ250 Competition Motocross
YZ360B 1975 360 YZ360 Competition Motocross
YZ400C 1976 400 YZ400 Competition Motocross


And the rear hub if you need it

Part # = 483-25311-13-98
Part Description = HUB,REAR
Model Count = 22
IT250F 1979 250 IT250 Dual-Purpose
IT250G 1980 250 IT250 Dual-Purpose
IT400C 1976 400 IT400 Dual-Purpose
IT400F 1979 400 IT400 Dual-Purpose
IT425G 1980 425 IT425 Dual-Purpose
MX250B 1975 250 MX250 Off-Road
MX400B 1975 400 MX400 Off-Road
TT500C 1976 500 TT500 Off-Road
TT500D 1977 500 TT500 Off-Road
TT500F 1979 500 TT500 Off-Road
TT500G 1980 500 TT500 Off-Road
TT500H 1981 500 TT500 Off-Road
YZ250A 1974 250 YZ250 Competition Motocross
YZ250C 1976 250 YZ250 Competition Motocross
YZ250D 1977 250 YZ250 Competition Motocross
YZ250E 1978 250 YZ250 Competition Motocross
YZ250F 1979 250 YZ250 Competition Motocross
YZ360A 1974 360 YZ360 Competition Motocross
YZ400C 1976 400 YZ400 Competition Motocross
YZ400D 1977 400 YZ400 Competition Motocross
YZ400E 1978 400 YZ400 Competition Motocross
YZ400F 1979 400 YZ400 Competition Motocross



This should be the swingarm
Part # = 509-22110-00-33
Part Description = REAR ARM COMPLETE YAMAHA BLACK
Model Count = 3
IT400C 1976 400 IT400 Dual-Purpose
YZ250C 1976 250 YZ250 Competition Motocross
YZ400C 1976 400 YZ400 Competition Motocross
Title: Re: What's going on with this ?
Post by: vandy010 on February 21, 2012, 08:48:50 am
Tony,
if you've got a DT250D rear wheel, they're a pretty sweet thing and still pre~78 legal and if you weld a tab on the swingarm to take the "slipper" style backing plate (if thats how it is) then i'd be going with that.
much easier to remove the rear wheel being a bonus ;)
but if it's the "cush drive" DT400 unit, then toss it.
Title: Re: What's going on with this ?
Post by: YZ250H on February 21, 2012, 09:03:55 am
Thanks guys.  My Zedder died along with my old computer and I can't find the email that unlocks it.  Must look again as I find it very handy  8)

The swingarm and backing plate are slipper style, so maybe that is actually an improvement  :-\.  As you say Mick it would still be pre 78 legal.  Not sure how anal I want to be with the whole YZ thing.  Maybe I just wack it together as is and take my time looking for the correct swingarm.

I will have to take some photos on the week-end of the hub and post them up.  From memory I don't think it is a cush drive jobbie.  Has three holes drilled between each sprocket bolt.  Maybe that will help identify it  :-\
Title: Re: What's going on with this ?
Post by: Nathan S on February 21, 2012, 03:54:08 pm
I've got a couple of 483 hubs if you want one. They've been close to hitting Ebay for about a month now.
Title: Re: What's going on with this ?
Post by: YZ250H on February 21, 2012, 04:26:29 pm
Thanks Nathan,

I will see what I've got first and get back to you
Title: Re: What's going on with this ?
Post by: YZ250H on February 24, 2012, 05:55:55 pm
So this is the hub and the backing plate.
What have I got here ?

(http://i202.photobucket.com/albums/aa49/tbarsby/004-6.jpg)

(http://i202.photobucket.com/albums/aa49/tbarsby/003-4.jpg)

(http://i202.photobucket.com/albums/aa49/tbarsby/002-5.jpg)

(http://i202.photobucket.com/albums/aa49/tbarsby/001-5.jpg)
Title: Re: What's going on with this ?
Post by: Iain Cameron on February 24, 2012, 06:45:19 pm
Im thinking IT or DT  more towards IT with the cam chain adjusters Iain
Title: Re: What's going on with this ?
Post by: YZ250H on February 24, 2012, 07:06:02 pm
Yeah who knows man :-\.  The cam chain adjusters may have come with the swingarm and backing plat
Title: Re: What's going on with this ?
Post by: Ted on February 24, 2012, 09:18:06 pm
Hey Gearlever, No council pick up where you are living now? :-*
Title: Re: What's going on with this ?
Post by: mainline on February 24, 2012, 11:08:36 pm
Ouch!
Title: Re: What's going on with this ?
Post by: Nathan S on February 25, 2012, 12:49:31 am
Rear hub is a 483 one - a correct part for the bike!

I reckon the backing plate is DT or XT, based on the rubber inspection plug. It may be IT or TT. YZ had a torque arm.
There will probably be a prefix code cast into the inside of the backing plate, in among the webs.

Is there a prefix code and/or date on the rim?
Title: Re: What's going on with this ?
Post by: YZ250H on February 25, 2012, 08:29:34 am
Hey Gearlever, No council pick up where you are living now? :-*

Just what are you trying to say Ted ??
Rear hub is a 483 one - a correct part for the bike!

Is there a prefix code and/or date on the rim?

Good news thanks Nathan.  Apart from "DID" and the rim size, the only markings on the rim are "5DB" and "587R".

5DB could be 508 ?
Title: Re: What's going on with this ?
Post by: mainline on February 25, 2012, 10:51:49 am
here you go Tony

http://www.ebay.com.au/itm/YAMAHA-YZ250C-CLASSIC-RACER-VMX-DIRT-TRACK-AHRMA-/280832420372?pt=AU_Motorcycles&hash=item4162eaaa14
Title: Re: What's going on with this ?
Post by: YZ250H on February 25, 2012, 10:54:52 am
Cool, maybe I should just spring for that and sell mine  :-\ 

The stuff I've got is all pretty good, NOS airbox, crank, barrel, piston etc.  It's just the swingarm that's an issue.

Moral dilemna - do I use what I've got and have a Frankenbike or go to the effort of getting the correct bits  ::)

OR -  I could buy that one and use it for a parts bike  ;D ;D

If everything was as it should be that should go for about $3600.
Title: Re: What's going on with this ?
Post by: mainline on February 25, 2012, 11:07:19 am


Moral dilemna - do I use what I've got and have a Frankenbike or go to the effort of getting the correct bits  ::)


get the right bits, no question
Title: Re: What's going on with this ?
Post by: YZ250H on February 25, 2012, 11:11:14 am
Yeah, kind of makes sense.

Frame and engine numbers are about 50 apart, but that's not a really big deal i don't think.
Title: Re: What's going on with this ?
Post by: Iain Cameron on February 25, 2012, 02:10:11 pm
I agree with Mainline go the right parts stock is always  the best Iain
Title: Re: What's going on with this ?
Post by: YZ250H on February 25, 2012, 03:19:43 pm
Done deal  ;)

I will source a swing arm  :o
Title: Re: What's going on with this ?
Post by: steveo247 on February 25, 2012, 04:12:45 pm
shipping might kill you, but it would be worth shooting off a few messages to these guys.


http://www.ebay.com/itm/1976-Yamaha-YZ-250-C-YZ250-Frame-Swingarm-Clamps-/110802405182?pt=Motorcycles_Parts_Accessories&vxp=mtr&hash=item19cc56873e#ht_1755wt_952

http://www.ebay.com/itm/1976-Yamaha-YZ-400-rear-swing-arm-have-lots-more-parts-bike-others-/320809230422?pt=Motorcycles_Parts_Accessories&vxp=mtr&hash=item4ab1b86056#ht_1809wt_952

Title: Re: What's going on with this ?
Post by: YZ250H on February 25, 2012, 04:27:35 pm
Thanks Steve,

I searched yz 250 76 and nothing came up  ??? ???

I will drop them a line and see what shipping would be.  The $99 one has free postage  ::) ;D

The other one has both chain guides.  Possible worth the extraordinary postage to get those  :-\
Title: Re: What's going on with this ?
Post by: Nathan S on February 25, 2012, 06:00:43 pm

Good news thanks Nathan.  Apart from "DID" and the rim size, the only markings on the rim are "5DB" and "587R".

5DB could be 508 ?

587 is the one. Forked if I know what that is, though.
Title: Re: What's going on with this ?
Post by: YZ250H on February 25, 2012, 07:41:36 pm
Yeah, in my traditional style I will probably spend a few days trying to polish the rims, get the sh1ts and buy new ones anyway.
I put a value on the amount of swearing things cause me.  Polishing rims to a decent standard is one thing that has high "swear value".   It is so much easier to get new ones and just lace them up.  Having said that the rims that are on the bike are in pretty good nick and still have the original DID stickers on them.  I'll give them a shot ... for a few days  ::)
Title: Re: What's going on with this ?
Post by: mainline on February 25, 2012, 10:01:04 pm
Make sure you let me know when the swearing threshold is reached
Title: Re: What's going on with this ?
Post by: YZ250H on February 26, 2012, 09:17:26 am
You'll be first in line for the old ones  ;)
Title: Re: What's going on with this ?
Post by: Ted on February 26, 2012, 05:39:55 pm
WOW....5 pages discussing a shock, hub, and a  wheel with no apparent work being done.

Welcome to the worlds first 3,000 page resto

Hey Tentpeg, Are you and Jai one in the same?
Title: Re: What's going on with this ?
Post by: Curly3 on February 26, 2012, 06:31:55 pm
If the neighbours are far enough away, buy a pot & hang a tarp.
The more you want to do in one hit, the better off you'll be.
Oh yeah, wear a mask.
Title: Re: What's going on with this ?
Post by: YZ250H on February 26, 2012, 07:36:46 pm
WOW....5 pages discussing a shock, hub, and a  wheel with no apparent work being done.

Welcome to the worlds first 3,000 page resto

Hey Tentpeg, Are you and Jai one in the same?

How does piss off sound  ;D ;D ;D ;D ;D

I think you are cutting me short on 3000 pages  ::)
So far I have found out I have the wrong swingarm and shock and the right rear hub.  The resto is practically finished now  ::)
Wait till I start asking questions about tags on the frame.  Will be riveting stuff.  Right up your alley  ;) 

Slidey the next door neighbours are a fair way away.  We all have an acre each where I am at the moment, so it's free reign  ;D.

At least we had something Yamaha to talk about for a change  8)
Title: Re: What's going on with this ?
Post by: Ted on February 26, 2012, 08:46:52 pm
Ok I'll go. Be back on page 1500 to check progress,k ;)


Did you get that bearing out of the 125 steering head?
Title: Re: What's going on with this ?
Post by: YZ250H on February 28, 2012, 06:43:44 pm
Yep, getting a new stem turned from stainless.  Using easy to get standard type/size seals - not those back to front OEM things made of unobtainium.

I just hope it works  :o.  Haven't heard yet wether he broke the triple clame getting the old stem out.  I'm sure it will all go smoothly  ::) ::)
Title: Re: What's going on with this ?
Post by: Ted on February 29, 2012, 07:27:50 pm
Stainless huh. You will get at least 12 months out of that before you will have to CHROME it. ;)
Title: Re: What's going on with this ?
Post by: YZ250H on March 01, 2012, 06:42:41 am
Polished stainless.  Kills 2 birds with one stone  ;D ;D ;D
Title: The YZ250C saga continues
Post by: YZ250H on March 07, 2012, 07:46:15 pm
So I have had a closer look at the frame that came with the dodgy swingarm and shock.  Looks like the rot continues.

I was given another frame when I purchased the "bike"

There are a number of differences, so I will defer to the experts on here as to which frame is more correct.
Pictures tell the best story.

Frame loops at the back

(http://i202.photobucket.com/albums/aa49/tbarsby/P1010806.jpg)

Airbox/chain guide
Frame A
(http://i202.photobucket.com/albums/aa49/tbarsby/P1010809.jpg)

Frame B

(http://i202.photobucket.com/albums/aa49/tbarsby/P1010808.jpg)

Frame Gusset Frame A

(http://i202.photobucket.com/albums/aa49/tbarsby/P1010819.jpg)

Frame Gusset Frame B - note slotted hole
(http://i202.photobucket.com/albums/aa49/tbarsby/P1010818.jpg)

I suspect Frame B is closer to the correct one, athough I note that the gusset part of frame A is the same as a YZ250B I have in the shed at the moment.  The serial number is very early as well.  Is it possible the frames evolved through the C model ???

Sadly frame B has had all the engine mounts carefully hacked off with an oxy torch  :'( :'(  just need to swap the mounts from the other frame.

Is Frame B the way to go ?

Title: Re: What's going on with this ?
Post by: YZ250H on March 07, 2012, 07:48:58 pm
Something going on with the top of the steering head as well.
Overall shot here

(http://i202.photobucket.com/albums/aa49/tbarsby/P1010822.jpg)

Also note the 2 things that look like oxy torch lighters are on Frame A (and the YZ250B frame), but not on Frame B  :-\
Title: Re: What's going on with this ?
Post by: Nathan S on March 07, 2012, 08:46:53 pm
First pic: left frame (Frame B?) looks right.

Second/third pics: Frame B is right, frame A is hacked.

Fourth/fifth pics: Don't know, but am inclined to say Frame B is right.

NFI about Frame B's steering head?! Well weird! More photos please...
The 'oxy flints' are part of the tank mounts - the stop the tank rocking and fatiguing the rear mount (not always successfully...). They are the first casualty if a different tank is fitted.
Title: Re: What's going on with this ?
Post by: YZ250H on March 07, 2012, 09:30:31 pm
I will get some more photos and report back.  All very mysterious  :-\
Title: Re: What's going on with this ?
Post by: GMC on March 07, 2012, 09:37:15 pm
Thought you had checked the frame No??
Title: Re: What's going on with this ?
Post by: Ted on March 07, 2012, 09:51:50 pm
2,994 pages to go :o
Title: Re: What's going on with this ?
Post by: Nathan S on March 07, 2012, 10:28:39 pm
I will get some more photos and report back.  All very mysterious  :-\

Also of both rear tank mounts.

Shame that some moron hacked the motor mounts off Frame B...
Title: Re: What's going on with this ?
Post by: YZ250H on March 08, 2012, 06:35:05 am
Thought you had checked the frame No??


Both 509  :-\

Frame A
(http://i202.photobucket.com/albums/aa49/tbarsby/P1010821.jpg)

Frame B
(http://i202.photobucket.com/albums/aa49/tbarsby/P1010820.jpg)

Title: Re: What's going on with this ?
Post by: Nathan S on March 08, 2012, 07:51:33 am
Hazy memory of this... but didn't both MX250B and YZ250C start with 509? That difference in the numbers (particularly the one starting in 10xxxxx) suggests one of each, yes?
Title: Re: What's going on with this ?
Post by: GMC on March 08, 2012, 08:30:34 am
As if Tony is not confused enough already…

Part # = 509-21110-05-33
Part Description = FRAME COMPLETE YAMAHA BLACK
Model Count = 5
IT400C 1976 400 IT400 Dual-Purpose
MX250B 1975 250 MX250 Off-Road
MX400B 1975 400 MX400 Off-Road
YZ250C 1976 250 YZ250 Competition Motocross
YZ400C 1976 400 YZ400 Competition Motocross
Title: Re: What's going on with this ?
Post by: Davey Crocket on March 08, 2012, 08:53:34 am
If my memory serves me correct....
509-00xxxxxx= MX250B
509-10xxxxxx=YZ250C
509-20xxxxxx=IT400C......but I might be wrong on this, could be 510
Works the same for MX400B and YZ400C....510...
Looks like you'll be making 1 frame from 2 going by those pickies, I only sold all that stuff 6 months ago, frames, swingarms, airboxes, bla bla.
Lots of NOS too....minter tank...still have a NOS seat, but thats not for sale. ;D
Title: Re: What's going on with this ?
Post by: TM BILL on March 08, 2012, 09:04:46 am
Looks like you'll be making 1 frame from 2 going by those pickies, I only sold all that stuff 6 months ago, frames, swingarms, airboxes, bla bla.
Lots of NOS too....minter tank...still have a NOS seat, but thats not for sale. ;D

Thats it Joan rub the mans nose in it  ::) ::)

Have you booked those tickets yet ?

Maybe Mr Bam bam wants a come over with you and Brad  for a ride  ;D we can find him a bike  :)
Title: Re: What's going on with this ?
Post by: Davey Crocket on March 08, 2012, 09:30:10 am
Booking today,fly on Thursday to Jaffatown and out following Saturday, so a week and a bit should be enough time to get all your new MNZ VMX class rules in. ;D...he has a big nose Bill. ;D
Title: Re: What's going on with this ?
Post by: YZ250H on March 08, 2012, 03:17:34 pm
If my memory serves me correct....
509-00xxxxxx= MX250B
509-10xxxxxx=YZ250C
509-20xxxxxx=IT400C......but I might be wrong on this, could be 510
Works the same for MX400B and YZ400C....510...
Looks like you'll be making 1 frame from 2 going by those pickies, I only sold all that stuff 6 months ago, frames, swingarms, airboxes, bla bla.
Lots of NOS too....minter tank...still have a NOS seat, but thats not for sale. ;D

Yeah, thanks for all the good news John  ::) ::) ;D

You got any bits left  ::)

Just had onther closer look at a parts diagram it looks like the oxy starters are not on the 250C  :-\ so maybe just the engine mounts and bash plate mounts need to be transferred to Frame B


 
Title: Re: What's going on with this ?
Post by: YZ250H on March 08, 2012, 07:41:17 pm
PLEASE, PLEASE, PLEASE tell me the motors are not numbered in the same way as the frames :o :o :o :o. 
Motor number 509-000545 or something like that.
Title: Re: What's going on with this ?
Post by: Nathan S on March 08, 2012, 09:36:56 pm
"The motors are not numbered the same way as the frames".
Are you happy that I've lied to you?

Title: Re: What's going on with this ?
Post by: YZ250H on March 08, 2012, 09:48:51 pm
FAAAAAARRRK.  So now I have an MX250 bottom end as well.  >:( >:( >:( >:( >:(

I am almost ready to part this thing out.
Title: Re: What's going on with this ?
Post by: Viper666 on March 13, 2012, 11:22:01 am

Appology time.

Have not read entire thread so sorry if alrady covered.

Nathan was right, I didn't look at the bottom mount. It is off a DT125/175 1978 model. The spare I have at home has the same lower mount and has 2A6 on it (DT125E). The rest is identical to the YZ100G apart from the replacable lower bush.

Never too old to learn.
Title: Re: What's going on with this ?
Post by: Ted on March 13, 2012, 02:16:47 pm
FAAAAAARRRK.  So now I have an MX250 bottom end as well.  >:( >:( >:( >:( >:(

I am almost ready to part this thing out.

Don`t do that. It will only run to 20 or 30 pages if you do that
Title: Re: What's going on with this ?
Post by: YZ250H on March 13, 2012, 07:14:02 pm
Most issues resolved now, so I will shut up and post a photo when I'm finished  ;)

Still a bit cranky about being sold a pup (apparently  :-\  )
Title: Re: What's going on with this ?
Post by: YZ250H on March 23, 2012, 07:16:29 pm
So.... I got my new right hand case with the YZ250C engine number on it.  Awesome I thought  ;).

Engine number ... 509-002666  :'( :'( :'( :'( :'( :'( :'( :'( :'( :'(
I now get to see if this seller is truly deserving of the feedback he has got so far.

I swear to god this project is cursed  >:( >:( >:(
Title: Re: What's going on with this ?
Post by: Ted on March 23, 2012, 07:41:29 pm
Heeee's back.....3,000 pages for sure
Title: Re: What's going on with this ?
Post by: mudguard on March 23, 2012, 08:39:09 pm
Hey Tony.
Your bitsa is looking more like a MX than a YZ. I have a parts manual for the YZ250C if you need any numbers, or compare what you have, against my YZ250C. Call me if you need anymore help.
Title: Re: What's going on with this ?
Post by: YZ250H on March 23, 2012, 08:59:01 pm
Thanks Wayne.  You're a lot more help than Ted  ;) ;D
I am starting the get the hang of the C model now.  I could tell you every nut and bolt on a H model of any size.  C model - NFI, but I'm working on it ::)
I do have some cool hard to get parts for this bike - top cable guide, muffler, chain guide. dent free tank. mint speedo and tacho.  And I do have an attachment to this model.
When I was a kid I had a DT100 (early) I went to visit a mate and some of his mates were banging around on this old YZ.  They gave me a ride and I crapped myself almost literally  ;D  My first taste of decent 2 stroke power :o  And the rest is history  8)
Title: Re: What's going on with this ?
Post by: Husk72 on March 24, 2012, 01:27:04 pm
Dont suppose you have a YZ360A frame,and swingarm sitting around down there Tony?  ;)

                                                     Cheers,Mark.
Title: Re: What's going on with this ?
Post by: YZ250H on March 24, 2012, 05:30:11 pm
What a coincidence :o :o.  I do Mark.  Not for sale though unfortunately.
If you bring 6 beers to share you can have it - can't get more reasonable than that  ;D
Title: Re: What's going on with this ?
Post by: YZ250H on May 14, 2012, 07:01:01 pm
OK - frame is all fixed.  Engine mounts now on the correct frame.  All ready for the blasters apart from this bracket.

(http://i202.photobucket.com/albums/aa49/tbarsby/065.jpg)

As a side note if anyone wants any of the tags or brackets off this frame now is your last chance before it goes to the recyclers
Title: Re: What's going on with this ?
Post by: YZ250H on May 16, 2012, 02:40:36 pm
Forgot to ask - if anyone has one of these brackets off a frame they have lying around that they would be prepared to sell I would be very grateful.

I need the bracket only.  Maybe a DT or Ag or someting has a similar bracket  :-\
Title: Re: What's going on with this ?
Post by: Iain Cameron on May 16, 2012, 09:32:14 pm
got a cpl of frames in the junk pile will have a look on the weekend Iain
Title: Re: What's going on with this ?
Post by: YZ250H on May 17, 2012, 05:27:46 am
Thanks man, much appreciated
Title: Re: What's going on with this ?
Post by: Ted on May 17, 2012, 08:05:30 pm
Have you started work on it yet?

Hope this post sends it to 8 pages :o

If it don`t, i may have to post again