[ejcycles]

Hi Jonathan
I just posted this to the Yahoo Jetmoto group also.
I looked at the pic you posted. Is this stuff soft & rubbery? or is it hard? I have seen something like this before on a Honda TRX250EX 4-wheeler, except it definitely was a rubber o-ring that ended up down in the internal engine filter area. The o-ring was almost complete but some of it was shredded like yours. I talked to a friend/technician of mine at a local Honda dealer, he looked at the piece that came out of this engine and neither of us with the book or microfiche could find where it went. I put the engine back together and it hasn't had a problem since, {about a year ago}.
There are no rubber o-rings in between the transmission gears or any place by the crankshaft. To split the cases you don't need to remove the flywheel. You will need to remove the clutch assembly but be careful, without the correct tools you can break parts. If you have any questions feel free to contact me.

Ride Wild and Fly Like an Eagle! 8O
Bruce