ok here goes, my blaster had a small crack in the bottom left side of the crankcase. so i tipped her up and but some jb weld on it.left it tipped over night and put another coat on at lunch today.i noticed some oil dripped out of the tailpipe tho. changed the oil in the motor and filled it up tp 650 ml. she turned over just fine. now it doesnt sound right to me tho. think there is a rattle or ping comin from inside the moter. smoking like a you kno what to. whitle smoke. idle is horrible to.when u take off in first it has no power and is bogged down. i shifted to 2nd and same thing. so is it burnin off excess oil thats in the exhaust or did i blow a head gasket. maybe a rod broke loose and thats what made the crack in the crankcase. anyways im lost and dont kno if i should run it and try to burn the oil off or what i should do for my next step.thanks alot for who ever can help me out.