Alright guys i searched but no answers to my problem. When i drive around for a bit, i notice smoke coming out the exhaust and it smokes only when i let off the throttle even on the freeway. I did a compression test and the compression is 240psi on all cylinder. The motor have less than 20k after rebuild. Anybody have a clue, I think it might be my valve stem seal.

 

valve stem seal...plus its a rebuilt...thats why...should of done a complete type-R swap! thats what im doing next when my GS-R motor cant run no more!