Just finished rebuilding my brothers blaster and doing 3 heat cycles. I got on it for a test ride and noticed it vibrates alot at higher rpms. I didnt pass 2nd gear. The mods are ken oconnor rechambered head, diy port job, v force reeds, 66.5mm wiseco, airbox lid removed, stock carb, stock filter, full fmf exhaust, 290 main jet. Needle on second position. It seem to have power. Did not feel weak. Also it smoked a bit around the head and cylinder fins. I did spray wd40 to clean them a bit before i installed, and kens rechambered head was just painted so maybe it was that. All bolts are tight. I took the spark plug out just to see what it looked like andthe tip was a dark grayish color. But that wasnt at full throttle so.
