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Author Topic: RM125 Rebuild  (Read 19401 times)

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Offline cnrcpla

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RM125 Rebuild
« Reply #15 on: February 11, 2012, 11:36:15 PM »
Oh, ok. I was thinking of restoring a 500, but its in pieces and most likely missing a ton, but the guys wants $550  :o The most I will go is $200...
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline 2T Institute

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« Reply #16 on: February 13, 2012, 11:19:06 AM »
The full reed 82 motor is best, you could buy DG or whoever arms that had welded on a threaded part to take a stock rod end. Also look at spherical bearings  ;D
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline TMKIWI

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« Reply #17 on: February 14, 2012, 07:21:47 AM »
Quote from: 2T Institute on February 13, 2012, 07:19:06 PM
The full reed 82 motor is best, you could buy DG or whoever arms that had welded on a threaded part to take a stock rod end. Also look at spherical bearings  ;D

All sorted on the link arms. The 84's are perfect and I will machine up some inserts when I build the other.
2T do you have any knowledge on squish clearence/ratio/compression on these older bikes.?
Any improvements I can make over 80's tech would be good.
I will clean up the ports a little ( which are very good anyway ) and just set up everything as good as I can.

Quote from: cnrcpla on February 12, 2012, 07:36:15 AM
Oh, ok. I was thinking of restoring a 500, but its in pieces and most likely missing a ton, but the guys wants $550  :o The most I will go is $200...

If you want to buy it for a project go ahead.
Just be prepared for lots of work for no financial gain.
But you will be very satisfied at the end. ;D
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline cnrcpla

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RM125 Rebuild
« Reply #18 on: February 14, 2012, 01:53:22 PM »
Quote
If you want to buy it for a project go ahead.
Just be prepared for lots of work for no financial gain.
But you will be very satisfied at the end. Grin
  That's the thing, I don't have a ton of money to replace parts on it, and it would be a blast, but I would have to sell it to break even with my restoring expenses. It would be different if I had a high paying job with tons of money, then I would keep it  :D
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline 2T Institute

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« Reply #19 on: February 15, 2012, 08:02:35 AM »
Quote from: TMKIWI on February 14, 2012, 03:21:47 PM

All sorted on the link arms. The 84's are perfect and I will machine up some inserts when I build the other.
2T do you have any knowledge on squish clearence/ratio/compression on these older bikes.?
Any improvements I can make over 80's tech would be good.
I will clean up the ports a little ( which are very good anyway ) and just set up everything as good as I can.

Ports are pretty shit actualy, the head has a angled plug making machining the squish a tricky job. I am doing a similar engine for a fellow here, I think a better cylinder would be the TF/TS 100/125 
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline TMKIWI

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« Reply #20 on: February 15, 2012, 08:39:36 AM »
Angled plug ?
Plug is vertical.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline 2T Institute

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« Reply #21 on: February 16, 2012, 01:50:17 AM »
Arrrrrgh silly me I was thinking of the air cooled engine, which is essentialy the same, except for the obvious. Machine the head to get 0.8mm squish 6mm wide. Think on a 82 road race engine we will O ring the head in order to get away from the head gasket thickness. Failing that a copper head gasket would be the go.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline TMKIWI

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« Reply #22 on: February 16, 2012, 07:04:28 AM »
When you mentioned a TS cylinder I thought , he is thinking 74' not 84'. :)
I will cc the head and get my comppression ratio and might get one of the machinists at work to o-ring the head.
Cheers.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline SachsGS

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« Reply #23 on: February 16, 2012, 03:53:25 PM »
I think a custom exhaust would work wonders on that engine. ;D
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline ford832

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« Reply #24 on: February 16, 2012, 05:48:53 PM »
Tsk,tsk 2t institute,that's a sign of old age.I'm glad I'm too young to have brain farts :-X  ;)
Hurry the H up TMKIWI,I want a full floater as compared to modern day riding impressions. 8)
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline TMKIWI

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« Reply #25 on: February 17, 2012, 06:15:58 AM »
Yeh Yeh, hold your horses. ;)
I have been busy the last 2 weeks compiling a list of parts and where to get them.
I have comming from the states new clutch and throttle cables, DG exhaust system, Guards and front plate,reeds, gasket set,engine bolt kit from DC Plastics and new .46kg fork springs & emulators from Race Tech.
The standard fork spring rate is .282kg so with the heavier springs, emulators and custom shock the bike will handle way better then they ever did new. ;D
I already have all the bearings and seals for motor and frame.
I am waiting to get the frames sandblasted next week and then I can paint them.2 pot suzuki metalic blue.
The rear shock is being rebuilt by BT's mechanic next week as well.
I need to get the engine cases soda blasted and then I am not sure weather to paint the engine black as they were standard or leave them bare. :-  Open to ideas.
I found a stock of NOS piston's at my local Yamaha dealer  :o so am sorted for pistons.
I was trying to figure out the best way to modify some pegs to fit so I could get rid of the 1/2" wide crap standard one's when I had a brain storm yesterday and I will copy my TM pegs and make some out of stainless steel at work. Should look the part. :)
Won't take long to put together when everything arrives it's just a matter of finding the time.
I have a mate who will print me up a set of these replica graphics I found on an Aussie vmx site. Thank you very much who ever you are.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline ford832

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« Reply #26 on: February 17, 2012, 01:27:13 PM »
This is a cool project-I've always had a thing for RM's.It will likely be hard to get a true impression once you're done over there.If you want to ship it over here,I'll give it a North American test for you  :D
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline 2T Institute

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« Reply #27 on: February 18, 2012, 01:32:00 AM »
Quote from: ford832 on February 17, 2012, 01:48:53 AM
Tsk,tsk 2t institute,that's a sign of old age.I'm glad I'm too young to have brain farts :-X  ;)

To get old and wise I had to be young and stupid once ;D
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline ford832

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« Reply #28 on: February 18, 2012, 01:32:11 PM »
Quote from: 2T Institute on February 18, 2012, 09:32:00 AM
Quote from: ford832 on February 17, 2012, 01:48:53 AM
Tsk,tsk 2t institute,that's a sign of old age.I'm glad I'm too young to have brain farts :-X  ;)

To get old and wise I had to be young and stupid once ;D

I'm old,I'm still waiting for the wise to kick in  :<img src=" title="Roll Eyes" class="smiley"> I actually thought I was reasonably knowledgeable but I've recently learned that my preteen daughter knows far more than me about absolutely everything. ;D
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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I'd rather a full bottle in front of me than a full frontal lobotomy.

Offline SachsGS

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« Reply #29 on: February 18, 2012, 11:33:42 PM »
Mark Twain once said at age 15 he couldn't believe how stupid his father was.By age 18 his father had improved enough to be considered acceptable. :<img src=" title="Roll Eyes" class="smiley">
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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