96 ski doo formula sls 500 engine trouble
Anyone familiar with this engine, doesnt seem to be in too many sleds, Rotax type 494. Just got it so dont know much history besides it was running when it cut out and guy hasnt touched it in almost a year but sled hasnt been formerly registered since 01. Its hard to turn over even without spark plugs so I took the engine out, pistons look ok excpet the one must have sucked something in cuz it has a bunch of little dings and chips on the top of the piston and head. The other piston is darker and seems to have a depression in the middle of it, either designed or its about to burn through. I see this engine has rotary valve which is cool I guess, but just more to go wrong. The disc has a good groove going all the way around but still seems to work ok. The engine turns over a little better now but still seems like a crank bearing or rod is rubbing and when I turn over the engine slowly the clutch makes a popping/pinging noise at least once a turn. I want to strip it down to the crank to get a good look but dont have experience in this area, only have taken off the jugs on engines before, plus its best if I have a manual to know how to put it back together correctly, where should I look for one?