I use interceptor and dont smoke at all in the banshee. I bet your jetting is messed up or it just needs broke in.

 

im not doubting you, but what does breaking it have to do with it?

 

the cylinder was bored about 7 over due to detonation, aftermarket exhaust, and k&n airfilter. do any of these things require rejetting?

 

Did you use alot of oil on the cylinder walls and wrist pin and bearings when you put it together? All the excess oil may still be in the crankcase. Last week didn't you mixed the oil wrong. Maybe all that extra oil is still in the crankcase. Also didn't you have a problem with it not starting, was it the sparkplug.

 

You have to rejet for aftermarket exhaust and air filter. You have to get more fuel in to account for the extra air coming in from a better exhaust and air filter. For the detonation either to low of octane fuel was used, too hot of spark plug, or ignition was advanced too much. I would ride it some and take the spark out and see how it looks.