Hello all, my first post, I just replaced valve seals, lapped valves, set clearance on a 1997 trx250, trying to make it stop smoking, burning oil, engine has 175LBS compression also have a 2000 foreman 400 seems to have good power but smokes and burns oil, My question is there anything besides piston&rings valve seals to make these machines stop smoking?, I never did the piston and rings in the 250, figured the compression was fine.