seeing how your posting in the mud section , chances are, you sank it ?, and instead of splitting the cases ( pulling the motor ), and cleaning it out real good, you just changed the oil a few times maybe ?, and now its smoking..right ?, welllllllllllllll, guess what !, its not that simple, if your gonna play ?, your gonna pay !..lol. this calls for a motor removal, split, cleaning/flushing out/rinsing ..nice and clean, putting back together with new rings, maybe new crank ?, maybe new cylinder ?, maybe new piston kit ?, maybe all of this ?. there is no cheap way to play in mud/water/lakes..or anywhere the motor goes under ?. hate to tell you this, but in order to fix the smoking ?, yu'll need to do/check/replace all of what i am saying.