first off, i just replaced every part of the head, except the head itself all valves guides, full top end everything. valves are in spec and everything checks out fine. 1. my first problem is its white smoking bad! its oil, not antifreeze i can tell. i put new valve oil seals, piston oil seals, and my cylinder is pretty new. any ideas? 2. my bike is backfiring really bad its back firing a little on acceleration and alot on decellaration. when i have the choke on it runs awesome, so i went up a pilot jet froma 40 to a 42. didnt fix a thing. any ideas? thanks in advance. let me know if i need to clarify anything.