Creating usable and reliable horsepower isn’t easy. Hours of track and dyno testing are only part of what makes championship winning performance.
At Pro Circuit, we have more than three decades of building and tuning performance engines that help our customers win races. From minis to
full-size bikes, we take pride in building some of the fastest and most dependable racing engines in the world.
In addition to our legendary engine tuning, we also offer a line of high-performance engine components such as camshafts, titanium valves, high-compression pistons and more that not only add performance but can increase the life of your race motor.
Will not chip like the stock seats
Helps increase the lifespan of your valves
(PER SEAT) FROM $129.95
FROM $349.95 FROM $549.95
FROM $39.95 FROM $649.95
FROM $89.95 FROM $359.95
FROM $74.95 FROM $99.95
(PER SEAT) FROM $39.95
VALVESEATS COPPER BERYLLIUM
TWO-STROKEENGINE MODIFICATIONS & SERVICES*
HEAD & CYLINDER MODIFICATIONSHEAD MODIFICATIONS (PORT & POLISH)
CARBURETOR SERVICECNC-MACHINE HEAD MODIFICATIONS
BORE & HONE STEEL CYLINDERREMOVE & REPLACE HEAD/CYLINDER
REMOVE & REPLACE POWER VALVE CRANKSHAFT REBUILD
RECUT VALVE SEATS
*Listed above are only a few services/modifications Pro Circuit offers. Please call for more details.
Increases lifespan of transmission parts
Improves shifting and lowers operating temperatures
FOUR-STROKEENGINE MODIFICATIONS & SERVICES*
ENGINE MODIFICATIONS & SERVICE
FROM $349.95 TRANSMISSION REM ISOTROPIC FINISHING