Engine

WE RACE ON THE TRACK, NOT THE DYNO! Most camshaft designs are developed only on a dyno. Good camshaft designs not only increase power, they also improve throttle response. However, more power and better throttle response is a difficult design problem...

Includes cylinder, piston kit and gasketsMatched with vertex pistons to ensure longevity, performance and reduce engine noiseReplacement piston, gaskets, and ring sets availableCylinder looks just like stockNickel silicon carbide plated for longer...

Bronco® offers OEM replacement valves for both ATV and UTV modelsOEM replacement valves are made of durable SUH35B heat resistant steel that also comes with fill Nitride finish for further durability and resistance to corrosionPerformance valves receive...

Bronco® offers OEM replacement valves for both ATV and UTV modelsOEM replacement valves are made of durable SUH35B heat resistant steel that also comes with fill Nitride finish for further durability and resistance to corrosionPerformance valves receive...

Bronco® offers OEM replacement valves for both ATV and UTV modelsOEM replacement valves are made of durable SUH35B heat resistant steel that also comes with fill Nitride finish for further durability and resistance to corrosionPerformance valves receive...

Feature Koyo and Nachi precision Japanese crank bearingsThe crankshaft seals feature a carbon/fluorocarbon pad on the seal lip and stainless steel garter springsReduces startup friction enhancing dry start performance and reducing crank pin wear

ATV/UTV Cooling Fan Assemblies Complete Fan and Motor Assemblies that are direct OEM replacements and ready to mount.

Includes inner clutch cover gasket, water pump cover gasket and all bearings, seals and washers required to rebuild water pumpMechanical seal included!Meets or exceeds OEM quality

Convenient one stop shop in a box! Nearly all components required for a complete and professional rebuild.Includes:Vertex Piston Kit (standard compression piston, rings, pin and clips)Hot Rods Heavy Duty crank (stock stroke - includes wrist pin bearing...

Convenient one stop shop in a box! Nearly all components required for a complete and professional rebuild.Includes:Vertex Piston Kit (standard compression piston, rings, pin and clips)Hot Rods Heavy Duty crank (stock stroke - includes wrist pin bearing...

High Quality OEM type replacement valve setsSave $$$ over OEM pricesValve Stem Hard Coated for improved wearMade in JapanSet contains one intake valve and one exhaust valve

Complete rotating and reciprocating rebuild kit including crankshaft assembly, main bearings and seals, pistons and components, and a complete engine gasket kitAll components were developed through extensive research and development on ProX’s in-house...