Williams Motowerx offers over 20 years of tuning in this department. Every aspect of our cylinder head designs has been covered with field testing by scrutinous top riders and a water brake dyno. This is the same dynamometer that NASCAR teams use for this simple reason, you can steady state the engine for true jetting and horsepower data... not typically found in the motocross industry because of cost and set-up time.

Our porting works hand in hand with our patent pending valves to give you an unmatched edge over the competition!

Only $299.95
 
 
 
 

It is a “flat” hot rolled wire design that drastically reduces oscillation, dramatically prevents valve bounce which loses horsepower, and valve float at higher rpm's. 

This design greatly improves the life of the valves and seats, improves performance, and current tests show no fatigue even after 40 hrs of use. Flat wire design offers many advantages in full lift design, no more over working the spring causing fatigue (especially useful in performance cams).
 

STOCK SPECS:
21.8lbs installed
89.0lbs. stock cam full lift

WILLIAMS MOTOWERX
25.6lbs installed
105.4lbs stock cam full lift
 
Only $139.95 for a set of 4.