i bought a 02 big bear about a year ago. when i bought it, it smoked like crazy and had oil coming out of the end of the exhaust pipe, but ran good, so i took it apart and honed the cylinder and put new rings and all gaskets. also seated the valves and put new oil seals. I put it back together and no smoking or anything but it wouldnt run with out the choke, put new carb kit in and readjusted the valves. now it still doesnt run with out the choke and now backfires and it smokes again like when i first bought it and oil is coming out of the exhaust, im just fed up and looking for any suggestions,
Sounds like u know alot more than me to do all that. Would the schematics help? Make sure your gas cap vent is not plugged. Dirt in tank? Maybe the guy before u did some carb work and put someting in backwards .
Try this link for the schematics: http://216.37.204.203/Yamaha_OEM/YamahaATV.asp
Good luck
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