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Author Topic: ID this head please.  (Read 7503 times)

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Offline YZ250H

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Re: ID this head please.
« Reply #15 on: February 19, 2012, 05:56:21 pm »
Ok - I've got a photo of that head from the front. See if this helps.  I found some pictures of Wayne's C on here.  The shape looks to be the same.  Wonder where the second plug came from  :-\



I have another one that came with the bike.  What is that from ??

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"My inability to use emoticins in the right context is really getting me down :)
Quote from: GMC on May 03, 2014, 10:35:22 am
The only triple jumps he would have been doing are the hop, skip & jump.

Offline Iain Cameron

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Re: ID this head please.
« Reply #16 on: February 20, 2012, 07:19:34 pm »
Sorry YZ250H its not a yzc 250 head the C did not have any cut aways on any of the fins . the fins are to large the C ones are about 1'' max long on the ctr fin   Ill post photo over the next couple of days . the single plug head looks like a YZ 250 D 1977 .
Iain
« Last Edit: February 20, 2012, 07:22:18 pm by iainyz »
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Yamaha tragic ; dt1, rt1, dt2, rt2, dt2mx , rt2mx , mx250, mx360,sc500, 74dt125, yzx125, yzc250, yzc400, yzd250, yzd400, yzh250, yzh80 , dt100 , xr75 ko xr80 03 , it175 82 . Not a member of any club

mainline

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Re: ID this head please.
« Reply #17 on: February 20, 2012, 07:49:24 pm »
Tentpeg, sounds like this bike of yours was some sort of factory prototype/rolling testbed. You should see how much Yamaha will buy it back for.
« Last Edit: February 20, 2012, 09:45:41 pm by mainline »
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Offline Ted

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Re: ID this head please.
« Reply #18 on: February 20, 2012, 08:58:52 pm »
Yammy won't be interested. I think it was made in North Korea or Honduras or somewhere using the early jap psyche of copy and improve, unfortunately lack of funds ruined the project

Buy a canoe
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Offline YZ250H

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Re: ID this head please.
« Reply #19 on: February 21, 2012, 07:02:40 am »
Quote from: iainyz on February 20, 2012, 07:19:34 pm
Sorry YZ250H its not a yzc 250 head the C did not have any cut aways on any of the fins . the fins are to large the C ones are about 1'' max long on the ctr fin   Ill post photo over the next couple of days . the single plug head looks like a YZ 250 D 1977 .
Iain

Yeah, thanks Iain.
I was pretty sure that second one was all wrong.  That was a spare anyway so you might just see it for sale soon  ;) ;D

The twin plugger, although not the correct one may just do the job.  Plus I will have the bonus of the "warm up plug" system.  Not building a nut and bolt resto, just a good clean rider.

Quote from: mainline on February 20, 2012, 07:49:24 pm
Tentpeg, sounds like this bike of yours was some sort of factory prototype/rolling testbed. You should see how much Yamaha will buy it back for.

Unfortunately it looks like it might be a bitsa.  Hopefully most of the remining stuff is correct or I will get crankier than I already am  >:( >:( >:(

Maybe I should just sell it now and cut my losses  :-\
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Looking for YZ250C parts NOS if possible

"My inability to use emoticins in the right context is really getting me down :)
Quote from: GMC on May 03, 2014, 10:35:22 am
The only triple jumps he would have been doing are the hop, skip & jump.

mainline

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Re: ID this head please.
« Reply #20 on: February 21, 2012, 07:24:22 am »
Nah, it's a well known fact that you need to buy 3 extra 'parts' bikes to restore the one you start with
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Offline YZ250H

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Re: ID this head please.
« Reply #21 on: February 21, 2012, 07:38:12 am »
True, I suppose.

At least it will be a runner once assembled  ;D ;D ;D
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Looking for YZ250C parts NOS if possible

"My inability to use emoticins in the right context is really getting me down :)
Quote from: GMC on May 03, 2014, 10:35:22 am
The only triple jumps he would have been doing are the hop, skip & jump.

Offline Ted

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Re: ID this head please.
« Reply #22 on: February 21, 2012, 09:22:32 am »
Quote from: mainline on February 21, 2012, 07:24:22 am
Nah, it's a well known fact that you need to buy 3 extra 'parts' bikes to restore the one you start with

Or you could farm it out to someone that can actually fit a gear lever correctly :'(
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81 YZ 465 H   77 RM 125 B

Offline YZ250H

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Re: ID this head please.
« Reply #23 on: February 21, 2012, 09:35:13 am »
Nah, that would make my resto's too expensive Ted  ::).  Touche  ;D ;D ;D

Gear lever lesson learnt well and truly.  When you've got half a day to spare I will tell you all the other lessons I have learnt from screwing up things on projects  ::)

Generally it is "always check the easy things first".  Like checking for a leaking valve before you grab the tyre levers to pull the tyre off  ::)  Gear lever is another example.

Maybe I should write a book.  "VMX restoration for the mechanically challenged"  ;D
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Looking for YZ250C parts NOS if possible

"My inability to use emoticins in the right context is really getting me down :)
Quote from: GMC on May 03, 2014, 10:35:22 am
The only triple jumps he would have been doing are the hop, skip & jump.

Offline Iain Cameron

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Re: ID this head please.
« Reply #24 on: February 27, 2012, 08:43:21 pm »
OK Ive given you a bum steer ,finaly got to the shed mmmmm forked up Iain ( note to self check first before opening trap hole ) the Yz c 250 only has one plug hole its the 400 that has two . sorry for the bum steer YZ250H . Iain  :-X :-X :-X :-X :-X
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Yamaha tragic ; dt1, rt1, dt2, rt2, dt2mx , rt2mx , mx250, mx360,sc500, 74dt125, yzx125, yzc250, yzc400, yzd250, yzd400, yzh250, yzh80 , dt100 , xr75 ko xr80 03 , it175 82 . Not a member of any club

Offline YZ250H

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Re: ID this head please.
« Reply #25 on: February 28, 2012, 06:53:42 am »
No worries whatsoever Iain.  Thanks for your help.

Now confirmed 250 C is one plug hole.  400 has 2.

First head is ???  Second one is YZ250D ??
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Looking for YZ250C parts NOS if possible

"My inability to use emoticins in the right context is really getting me down :)
Quote from: GMC on May 03, 2014, 10:35:22 am
The only triple jumps he would have been doing are the hop, skip & jump.

Offline Nathan S

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Re: ID this head please.
« Reply #26 on: February 28, 2012, 09:06:27 am »
Quote from: Nathan S on February 15, 2012, 11:21:20 am
Was the head originally a twin-plug head, or a single plug head that's modified?

???

The way the second plug sits under the long fin suggests its modified - usually Yamaha would give lots of clearance around the fin - which would cut the fin entirely.

Edit: Ignore the above. It's MX250B.

The parts picture at Yamaha-motor.com clearly shows two plugs (with one slipping under the long fin), and no fins cut for exhaust clearance.
The pic is here: http://partstream.arinet.com/Image?arik=BuIO8rMsKpZ4DQ063ygX&arib=YAM&arim=iPJ6VgYfK1nym6YvnClJQw2&aria=zDANmFQpUd7dhdhylcHqvQ2&ariz=1&ariv=http%3A%2F%2Fwww.yamaha-motor.com%2Fpartviewer%2Fdefault.aspx%3Fls%3Dsport , but it will some up as "bad request" if you click on the link...

DT250B+ are all sinlge plug, and have fins cut for the exhaust.
YZ250C is single plug.

Same source confrims that the second head is YZ250D.
« Last Edit: February 28, 2012, 09:16:29 am by Nathan S »
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The good thing about telling the truth is that you don't have to remember what you said.

Offline YZ250H

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Re: ID this head please.
« Reply #27 on: February 28, 2012, 06:40:59 pm »
Mystery solved.  Thanks guys.

I might clean them both up and sell them for a deposit on a 250C head  ;D ;D
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Looking for YZ250C parts NOS if possible

"My inability to use emoticins in the right context is really getting me down :)
Quote from: GMC on May 03, 2014, 10:35:22 am
The only triple jumps he would have been doing are the hop, skip & jump.
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