Looking for some help. I am having the dreaded popping on decel like tons of others. I started by taking the bike to get the valves checked, still popping. After getting the bike back I started smelling some burning oil. Could the mechanic have done anything to cause this? I recently bought a "carb rebuild" kit and exhuast gaskets to try to stop the popping. My buddy was telling me that due to the smell and noises, he seems to think I am due for a rebuild. Is this true? Any help would be greatly appreciated! Thanks.