well, i found my oil leak (http://www.gstwins.com/forum/viewtopic.php?t=4842). it's actually a far worse leak than i had thought. i was out riding for about 20 minutes the other night, and i got home to find that my entire rear wheel had a nice slippery coat of oil on it. rest assured, i will not be riding until i fix the leak.
it turns out that it's the seals around the output shaft of the transmission. i took the chain off, and it was fine, but once i put the chain back on, i guess the tension is enough to create a gap in the seal.
anyhoo, i took the sprocket off and noticed that the shaft had some wobble to it. i assume this is a bad thing.
my questions are:
how much wobble is normal if any?
if it shouldn't be wobbling at all, which is what i suspect, what is the cause of the wobble? bent shaft? worn out bushing? i'll take any guesses here. i'm thinking this is gonna be a big headache.
if there's no need to worry about the wobble, can i replace those seals without taking my whole damn bike apart? clymer says to pull the engine and split the crancase open. i'd rather not do that.
and one more thing... is the engine block aluminum? i was tring to tighten down some of the bolts on the oil pan, but they were just turning. didn't feel like they were getting any tighter. my guess is that the holes are stripped.
any and all help is appreciated.
thanks,
Ahh, that is bad. The transmission shaft runs in ball bearings, and there should be no play. It is very unusual for those bearings to fail. Running the chain much too tight might do it.
Fixing the seal or the bearing requires splitting the cases.
Yes, the cases are aluminium. You have stripped the bolts. This bad also. A torque wrench should be used.
You should have a manual.
Quote from: KevinCAhh, that is bad. The transmission shaft runs in ball bearings, and there should be no play. It is very unusual for those bearings to fail. Running the chain much too tight might do it.
Fixing the seal or the bearing requires splitting the cases.
Yes, the cases are aluminium. You have stripped the bolts. This bad also. A torque wrench should be used.
You should have a manual.
fwiw, they holes were already stripped, and *i* never tightened the chain. i just bought the bike a month or so ago.
guess i am screwed.
anyone got a tranny they wanna sell me?
I've got way too many main shafts laying in my workshop. But putting one in requires removing the engine, dismantling it entirely, and splitting the cases. You may be better off finding a used engine for $200 or $300.
Steel bolts fitted directly to threaded holes in alloy cases are the curse of the motorcycle industry. It's done because it's much cheaper and quicker than doing the right thing, i.e. steel bolts in threaded steel inserts fitted into alloy cases.
This cheap-skate approach has two alarming side effects. First, the different metals in contact cause electroltyic corrosion. This causes the dreaded stell/alloy 'death grip' which means that over time the steel fixing become 'welded' into the alloy with corrosion, and those suckers just won't come out. Particularly bad news with small fixings where the heads will break off before you can get enough torque on them to break the grip.
Second, the alloy is MUCH softer then the steel, and the threads in the holes will strip at the first teensy-weeny hint that they are being over-tightened. If you work on a m/c you must, before you do anything else, get yourself a good, accurate torque wrench.
Quote from: KevinCI've got way too many main shafts laying in my workshop. But putting one in requires removing the engine, dismantling it entirely, and splitting the cases. You may be better off finding a used engine for $200 or $300.
BTW what is the shaft made of... how hard is it to drill a hole down the center off it...I want to tap it and run a bolt... as step 1 to belt drive.
Cool.
Srinath.
It's definitley steel, with at least surface hardening. I'd have to try drilling one.
srinath, if you can figure out how to do a belt drive, post and share the info? :mrgreen: :thumb: thanks
kevin,
exactly what parts do you have lying around in your garage? any you want to sell me? like an assembled output shaft maybe? it's looking like the engine is coming apart. i've got all winter to do it. looks like i will have to entertain myself with my supra for the remainder of the fall.
Yep, I can probably part with one of my precious output shafts! I presently have 3 GS engines laying in my shop, in various degrees of destruction. The trannies are fine though.
PM me, and we can work out a deal.