OzVMX Forum

Marque Remarks => Suzuki => Topic started by: crankpin on January 04, 2012, 01:58:17 am

Title: RM125N
Post by: crankpin on January 04, 2012, 01:58:17 am

Latest member of the stable...

Q: Can you increase the capacity i.e. PE175 crank and barrel?

(http://i846.photobucket.com/albums/ab30/crankpin/006.jpg)

Title: Re: RM125N
Post by: VMX247 on January 12, 2012, 12:21:49 pm

Q: Can you increase the capacity i.e. PE175 crank and barrel?

dont know-hijack-back at you !!..did the "N" series come in an 80cc ??
cheers A
ps sweet blue frame you got
Title: Re: RM125N
Post by: crankpin on January 12, 2012, 07:11:18 pm

Sure they did an 80N

The blue frame hurt my eyes at first, it's growing on me though  :)
Title: Re: RM125N
Post by: JohnnyO on January 12, 2012, 07:13:40 pm
The blue frame hurt my eyes at first, it's growing on me though  :)
It still hurts my eyes..!
Title: Re: RM125N
Post by: crankpin on January 12, 2012, 07:26:01 pm

 :(

I'd have it powdercoated by now but not sure what I'm doing with it yet???
Title: Re: RM125N
Post by: JohnnyO on January 12, 2012, 07:36:39 pm
One of the best 125's in the twinshock class.
Title: Re: RM125N
Post by: crankpin on January 12, 2012, 07:37:39 pm

Possibly, but at 16 stone in my gear, do I have any right to be on one?
Title: Re: RM125N
Post by: JohnnyO on January 12, 2012, 07:46:52 pm
Ok i'd probably stick to 250/500's... extra weight seems to kill a 125
Title: Re: RM125N
Post by: crankpin on January 12, 2012, 07:47:55 pm

Hence the original question  ;D
Title: Re: RM125N
Post by: JohnnyO on January 12, 2012, 07:54:39 pm
I'd say a 175 engine would bolt straight in but not sure about the 175 parts fitting the 125 cases.
Title: Re: RM125N
Post by: crankpin on January 12, 2012, 07:56:35 pm

Exactly what I thought.

Anyone else tried this mod?

Title: Re: RM125N
Post by: JohnnyO on January 12, 2012, 08:13:51 pm
You might have to start a new thread with that question...
Title: Re: RM125N
Post by: oldfart on January 12, 2012, 08:34:54 pm
In short the distance between studs vary.... Rm 125 N at reed  = 90mm  and the  T  are 68 mm where as the Pe are 72 mm    
There is no way you are going to fit a PE 175 barrel in Rm 125 N/T cases  without a lot of welding and Milling ;)
                  
Title: Re: RM125N
Post by: JohnnyO on January 12, 2012, 09:19:44 pm
Hey Stew wouldn't the 125N & T be the same?
Title: Re: RM125N
Post by: Davey Crocket on January 12, 2012, 10:38:53 pm
You would think so but there diferent....cases, crank.....probably why you dont see many around...I think the N's closer to the ABC but the T's on its own.
Title: Re: RM125N
Post by: JohnnyO on January 12, 2012, 10:48:53 pm
I had a 125N back in the day and don't remember it being much different to the T other than the guards and swingarm chain guide.
Title: Re: RM125N
Post by: mainline on January 12, 2012, 11:21:23 pm
I thought the n/t were basically the same too
Title: Re: RM125N
Post by: crankpin on January 13, 2012, 07:17:35 am

Thanks for the info.

Looks like I'm after a Full PE175 engine then  ???
Title: Re: RM125N
Post by: mainline on January 13, 2012, 07:44:52 am
Yep, i've got a pe175x I use in mx. Really nice motor
Title: Re: RM125N
Post by: YZ250H on January 13, 2012, 08:04:55 am
Yep, Mainlines PE is too much bike for Hoony and Roger HArvey  :o :o :o ;D
Title: Re: RM125N
Post by: mainline on January 13, 2012, 10:37:28 am
I knew the pe was too powerful for Hoony, didn't know that Rog was scared off as well?
Title: Re: RM125N
Post by: YZ250H on January 13, 2012, 11:24:06 am
He was too scared to take it out I think  ::) ::)  You were out getting mud on some other poor blokes bike  ;D
Title: Re: RM125N
Post by: monaro308 on January 13, 2012, 03:44:51 pm
Here is some homework i've done for you although its an RM100X frame,its basically the same frame as the N,T 125s
(http://i199.photobucket.com/albums/aa250/hjcoupe/RM100Xframe.jpg)

With the RM100X cases in the frame.....its natural home
(http://i199.photobucket.com/albums/aa250/hjcoupe/RM100Xframewith100xmotor.jpg)

Now with the PE175C engine,similar engine design to your 125N but the cases are wider by approx 5mm
so your frame case  mounts need to be widened.
(http://i199.photobucket.com/albums/aa250/hjcoupe/RM100Xframewith175cmotor2.jpg)

Same 175C engine in the frame
(http://i199.photobucket.com/albums/aa250/hjcoupe/RM100Xframewith175cmotor.jpg)

Now we move onto the later PE175Z-E floater motors which is again 5mm wider to your 125N motor
(http://i199.photobucket.com/albums/aa250/hjcoupe/RM100Xframewith175zmotor2.jpg)

Same 175Z-E motor in frame BUT is also wider at the sprocket side (further out) by about 8mm to the other engines.
These also had an extra case mount hole at the bottom.
I'm not 100% sure if the PE175T-X engines were the same design as the Floater engines (Leith and Luke would know)
even though i owned an X for 9 years,but i'm leaning towards a yes.
(http://i199.photobucket.com/albums/aa250/hjcoupe/RM100Xframewith175zmotor.jpg)

To add to that as well was that these engines had a bracket that is held/mounted between the swingarm
(http://i199.photobucket.com/albums/aa250/hjcoupe/PE175zbracket.jpg)

As the others also said,cylinder/reed spacings are all different as well.
All said and done,it will still be that engine mount brackets and chain alignment plus the fiddly time consuming
pipe,muffler stuff to do.
Title: Re: RM125N
Post by: oldfart on January 13, 2012, 04:23:05 pm
I  will post up some pics latter on of the difference in cases from N to T with Pe 175 motor......Need a Cuppa and a nanny nap first  ;)
Title: Re: RM125N
Post by: vmx42 on January 13, 2012, 04:54:46 pm
125T with PE175. 1984 RM125 rear wheel and complete 43mm, twin leading shoe, front end.

(http://i154.photobucket.com/albums/s255/vmx42/RM175.jpg)
Title: Re: RM125N
Post by: oldfart on January 13, 2012, 05:09:03 pm
Ok I'm back  you will notice the cases have had a complete redesign from 79 to 80 on Rm 125
left to right are  Rm 125   1979  -  Rm  125 1980   and  a Pe 175 1981
(http://i72.photobucket.com/albums/i180/mutchoo/001-1.jpg)
Title: Re: RM125N
Post by: crankpin on January 13, 2012, 06:48:25 pm
Here is some homework i've done for you although its an RM100X frame,its basically the same frame as the N,T 125s

Ok I'm back  you will notice the cases have had a complete redesign from 79 to 80 on Rm 125

Wow, great info. Thanks.

oldfart, have you any closer images or info on the frame mods at the rear engine mounts?

Thanks again.

Simon.
Title: Re: RM125N
Post by: crankpin on January 13, 2012, 07:03:57 pm
125T with PE175. 1984 RM125 rear wheel and complete 43mm, twin leading shoe, front end.

Very neat.

Any specifics on the mods?

Title: Re: RM125N
Post by: crankpin on January 13, 2012, 07:08:53 pm
Yep, i've got a pe175x I use in mx. Really nice motor

Any closeups?

Cheers.
Title: Re: RM125N
Post by: oldfart on January 13, 2012, 08:34:53 pm
Simon, larger pics sent.
Title: Re: RM125N
Post by: crankpin on January 14, 2012, 07:35:41 am

Got them, cheers  :)
Title: Re: RM125N
Post by: mainline on January 15, 2012, 08:44:58 am
Yep, i've got a pe175x I use in mx. Really nice motor

Any closeups?

Cheers.

Sorry, what I meant was I have an actual PE175X that I use in MX, not a PE motor in an RM frame. I did plan to swap the motor into an RM125 frame that I had, but at the end of the day I couldn't see the benefit given the frame dimensions seemed so similar when I had them side by side. I ended up just stripping gear off the PE and using it as is.

(http://i300.photobucket.com/albums/nn38/mainline_bucket/leggyegg.jpg)
Title: Re: RM125N
Post by: mainline on January 15, 2012, 08:51:02 am
also, the rear engine mount span on the '81 175X motor is 74.5 mm if that helps? I'd assume the 1980 model used the same cases, not sure if 79 was a follow on from the 78 RM though, and different as a result.
Title: Re: RM125N
Post by: crankpin on January 15, 2012, 09:01:11 am

&9/80 RM125 was the same.

I'll measure up my rear engine mounts tomorrow.

Title: Re: RM125N
Post by: lukeb1961 on January 15, 2012, 02:23:23 pm

Sorry, what I meant was I have an actual PE175X that I use in MX, not a PE motor in an RM frame. I did plan to swap the motor into an RM125 frame that I had, but at the end of the day I couldn't see the benefit given the frame dimensions seemed so similar when I had them side by side. I ended up just stripping gear off the PE and using it as is.

I have recently been discussing (via e-mail) the PE with John Morgan and Drew Smith of Team Suzuki fame from back then. Drew (or John, maybe it was John) makes it clear they took the RM125 frames and tweaked for the PE model. So yeah, the dimensions are likely to be very similar.  Here is his description of the PE175Z full-floater:

 "With the PE 175, we decided to build the full floater which we revised the frame from a RM 125, built the swing arm to incorporate the quick change hub, ported the engine for performance and crated it up and shipped it to California.  We met with a group of engineers and went over the bike in minute detail.  They made one change.  We had made a rod actuated rear brake going through the swing arm bolt to eliminate any feedback due to the swing arm movement.  They were afraid of that for safety reasons and stayed with the cable actuated brake."

Luke
Title: Re: RM125N
Post by: mainline on January 15, 2012, 03:09:57 pm
Yeah, there was very little difference between the pe175x frame and rm125n frame that I could see. Mostly brackets and ancilliary stuff.
The only major thing was the frame upright and shock bracing area on the LH side.
Title: Re: RM125N
Post by: vmx42 on January 16, 2012, 09:02:56 am
I wonder what the weight difference is between the PE and RM frames? 
Title: Re: RM125N
Post by: mainline on January 16, 2012, 09:13:53 am
Probably a couple of pies and a beer or two?
One minor thing I found peculiar, the PE used 10mm shock bolts, while the RM used 8mm?
I would have thought it'd be the other way around if anything