My new 1987 RM 125
I think that I shall never see
A triple jump as big as the
Next time I won't try them as three
I had one last Summer 08
Check the far right side of the crank for wear.
The crank doubles as the waterpump shaft and loves to groove. All the new waterpump seals in the world won't fix it.
If it's grooved, weld it and then turn it down on a lathe.
Trust me, It will be easier to do that than find a good crank.
My first "old" bike pickup was a '87 RM250. Really fun bike to ride.
Thanks ahead of time! I want to race it this weekend!
a faster bike just means you'll be shutting off sooner
In a 125, you should run no higher than 32:1. contrary to popular belief, more oil in the fuel produces more horsepower. The theory is that it improves ring seal but in practice it makes more power on he dyno and decreases blow-by and piston wear. In fact, I'm running 28:1 with 100LL in my RM250 and the exhaust produces zero spooge and a perfect grey exhaust color in the silencer.
cpracing519 wrote: Thanks Motogeeze, that helps out a lot! I will try mixing it at 40:1 and then go from there!
For a good premix oil that is easy to find and priced right, try Lucas semi-synthetic. You can buy it 7 days a week at any O'Reilly or Autozone auto parts store for just $5.99 a quart.
The Shell Rotella T 15w40 holds up to the meshing tranny gears better than their 5w40 synthetic. It's cheaper also.
Question on graphics? Dont need them yet, cause thats the last thing I need to do, but just trying to find info on my bike.
The vin on my bike says its a 1987. Code H
1. Is it suppose to have Full Floater on the swing arm or Suzuki? Mine says Suzuki.
2. On the radiator shrouds are they suppose to say RM125 or just RM? Mine just says RM.
I've been looking at other pictures online and havent been able to figure out what I need yet. Any help would be appreciated!
Looking at buying another 87 RM125 Tuesday to buy for a parts bike, but it doesnt have any graphics on it to compare to mine.
So far 1 motor had a ton of dirt in it from a torn reed cage boot, plus it had a stock piston in it with a bored out cylinder. You would think the person would have put the correct piston in it after borring it out. The other motor looks pretty good. Both cranks/rods appear to be in good shape. Looks like I only need to do top ends on them.
What is the best way to flush out the bottom end with out splitting the cases? Can I just hose them out with water or should I use a engine degreaser or mineral spirits?
How bout painting the frame/motor? Powder coat or paint?
Are the 87 motors and 88 motors basicley the same. I have a ton of 88 motor parts, but own 2 87's.
Can I put a 88 jug,cylinder, and piston onto my 87 motor? I have a modded jug that is borred over from an 88 with the correct oem piston. I want to use it on my 87 motor. Looking at everything they seem to be the same, but I dont want to put it all together and then blow it up right away.