The legendary 6MIK Booster back plate is back, now revised to fit the latest generation of OS XZ-B Spec II, III B2102, B2103 and OS based engines including the Bullitt B-221.
The 6MIK back plate is designed to create low pressure energy in the ball pockets located at the top of the back plate. When your exhaust port opens it rushes out creating low pressure behind it. As fresh fuel is drawn up from the crankcase these pockets become energised pulling fuel through the back plate runners into the crankcase runners. This is more effective in the mid -> high rpm. In the low rpm the plate is only effective in pulling fuel into the crankcase at a higher velocity through the carburettor and crankshaft.
So in essence you get:-
- Faster return to idle
- Increased Fuel efficiency
- Increased Mid-High RPM Power