I bought an R off eBay. Its a 310cc flat track set up.

I have a question about the motor. It has AV gas right now mixed at 40:1 and smokes A LOT! I warmed it up and it still smokes a lot. The jetting is spot on too. Why does it smoke so much?

The guy told me it leaks a little oil from crankcase, but I dont think this could cause all the smoke I see. I am getting a lot of spooge out the silencer too, even though jetting is good.

Is it possible that the excessive smoke I see is from the oil leak from crankcase? Getting sucked into motor? I doubt it could be the collar/seal on clutch side because the leak is visible on the floor...

Any takes on this?