China girl 66/80cc on cruiser, 200 miles or so 40:1 mc-1 oil which is 50:1 recommend. bike rode fine up until next morning I went to go for a ride and the clutch wouldn't catch but every other grab and only slightly. took off clutch cover and a dark gas oil mix dumped out now what? rebuild or buy new. I do have anothe engine that the mounting bolts are snapped off In?
headache
- Thread starter aarcher30
- Start date
Kioshk
Active Member
Well, if you want a reliable happy ride, now's a good time to start!
The only practical way of fixing that seal is to split the case. You MIGHT be able to extract it after only removing the crank's beveled-gear, but I sure have never had luck doing it that way. In any case, if it's as you described, you'll need to buy a new seal...they come in pairs, and it'll put you back about $10. You'll also probably need new bottom-end cylinder and case gaskets ... another $15? If you don't have the proprietary gear-puller, that's another $10 delivered. Assuming you're not too mechanically inclined up to this point, you'll also need proper tools...$$$. I think the investment's worth it, but as a beginner, you'd better get used to the headaches of becoming an expert...I think it's worth it.
MotorBicycleRacing
Well-Known Member
There is absolutely no need to split the case to install a seal on these motors!
You can buy seals individually at $3 from many places.
The right side bevel gear side seal is the thick one. The thinner one goes on the magneto side behind the magnet.
You will also need the gear puller tool.
Use a sharp pointed tool to extract the old seal.
Use a socket that is a bit smaller than the diameter of the seal
to push it straight into the case.
Lube the seal with oil.
Check the shaft that it has no sharp edges that may damage the seal.
Might be easier to replace if you pull the clutch off.
Do you have mechanic tools in metric?
If fuel is "literally dumping out" your problem isn't a crankshaft seal. I'd start looking at a stuck float valve in the carburetor, a leak from the fuel tank/petcock/fuel line.
I bad seal will not allow that much fuel to get into the clutch area.
You can clean up the clutch with Brake Clean, a spray solvent and dry it with compressed air.
If crank seals need replacing they aren't difficult t do but I'd make very sure where the fuel is coming from before getting into that job.
Tom
I bad seal will not allow that much fuel to get into the clutch area.
You can clean up the clutch with Brake Clean, a spray solvent and dry it with compressed air.
If crank seals need replacing they aren't difficult t do but I'd make very sure where the fuel is coming from before getting into that job.
Tom
KCvale
Well-Known Member
Should you have to spit the case, this is a pretty good video of how everything comes apart and goes back together, just turn your sound off unless you are a big 'Rocky' fan ;-}
https://www.youtube.com/watch?feature=player_embedded&v=sYcbPD5r-0o
This is helpful for anyone with a 2-stroke engine.
https://www.youtube.com/watch?feature=player_embedded&v=sYcbPD5r-0o
This is helpful for anyone with a 2-stroke engine.
Crankshaft seals are not reusable. You can't use the seals from a "Parts motor". You won't get one out without damaging it.
Seals are cheap.
Tom
