Just got a 1991 Lt250r for $500 complete not missing anything. It starts up and runs, with that said it does not run well. I am new to this hobby and need some insight. While running it seems to leak oil from the exhaust manifold area, i also have a leak at the sprocket that I'm sure is the seal needing replaced. It also smokes a lot of white with a hint of blue and smells very strong like fuel. It does have a full fmf series exhaust and owner said its been bored .20 over with new piston rings and crank as well. My question is what is going on with oil dripping out of exhaust port and what is going on with the excessive smoke? maybe jetting,bad seal some where? i don't know where to start with the jetting and i also need to know how to make sure the power valve is doing what it is suppose to. Any help would be great