Dirt Bike Engine

Prox - PX4221A - Piston Kit - 53.96 mm - Kawasaki KX125FeaturesCast from a high-silicon-content aluminum alloy that meets or exceeds OEM specifications, then CNC-machined to extremely close tolerancesKit includes piston, ring kit, wrist pin, and...

Prox - PX4041 - Piston Kit - 89.25 mm - Honda CR500RFeaturesPrecision machined on state of the art CNC equipmentMade with low expansion, low friction alloyKit includes piston, rings, circlips and wrist pinSpecsBore - Oversize+0,25 mmRiding...

Prox - PX4040 - Piston Kit - 89.00 mm - Honda CR500RFeaturesPrecision machined on state of the art CNC equipmentMade with low expansion, low friction alloyKit includes piston, rings, circlips and wrist pinSpecsBore - OversizeStandardCompression Ratio...

Prox - PX7080C - Piston Kit - 67.96 mm - Yamaha WR250/YZ250FeaturesCast from a high-silicon-content aluminum alloy that meets or exceeds OEM specifications, then CNC-machined to extremely close tolerancesKit includes piston, ring kit, wrist pin, and...

Prox - PX7080D - Piston Kit - 67.97 mm - Yamaha WR250/YZ250FeaturesCast from a high-silicon-content aluminum alloy that meets or exceeds OEM specifications, then CNC-machined to extremely close tolerancesKit includes piston, ring kit, wrist pin, and...

Prox - PX7080B - Piston Kit - 67.95 mm - Yamaha WR250/YZ250FeaturesCast from a high-silicon-content aluminum alloy that meets or exceeds OEM specifications, then CNC-machined to extremely close tolerancesKit includes piston, ring kit, wrist pin, and...

Prox - 09240346 - Crank Bearing Kit - SuzukiFeaturesIncludes all necessary bearings/seals for a component’s replacementFor use with OEM or Pro-X crankshafts.SpecsRiding StyleOff-RoadApplicationCrankshaftProduct NameBearing...

Prox - 09230331 - Connecting Rod Kit - Gas Gas | Husqvarna | KTMFeaturesEasy to installSpecsRiding StyleOff-RoadProduct NameConnecting Rod KitUnitsKitEngine Type2-StrokeMaterialForged SteelFitment2021Gas GasMC 852014-2025HusqvarnaTC85 17/142013-2025KTM85...

Prox - 09230461 - Connecting Rod Kit - KawasakiFeaturesEasy to installSpecsUnitsKitEngine Type4-StrokeMaterialForged SteelProduct NameConnecting Rod KitRiding StyleOff-RoadFitment2019-2020KawasakiKX2502017-2018KawasakiKX250F

Prox - 09262725 - Valve and Spring Kit - Exhaust - YamahaFeaturesSteel, nitrided valves for increased durability and less wear under extreme conditionsStronger valve springs deal with the extra weight of the steel valvesSprings are made from premium...

Prox - 09240325 - Crank Bearing and Seal Kit - YamahaFeaturesIncludes all necessary bearings/seals for a component’s replacementFor use with OEM or Pro-X crankshafts.SpecsApplicationCrankshaftProduct NameBearing and Seal...

Prox - 09106097 - Piston Kit - 40.00 mm - Yamaha MJ50/PW50FeaturesOversized options follow manufacturer piston to cylinder wall clearancesKit includes piston, ring kit, wrist pin, and circlipsSpecsCompression Ratio ImperialStandardEngine...

Prox - 09230614 - Connecting Rod Kit - YamahaFeaturesEasy to installSpecsProduct NameConnecting Rod KitRiding StyleOff-RoadEngine Type2-StrokeMaterialForged SteelUnitsKitFitment2019-2025YamahaYZ85

Prox - 09230471 - Connecting Rod Kit - Gas Gas | Husqvarna | KTMFeaturesEasy to installSpecsProduct NameConnecting Rod KitRiding StyleOff-RoadUnitsKitEngine Type2-StrokeMaterialForged SteelFitment2016-2022, 2025KTM150 SX2021-2025Gas GasMC...

Prox - 09230365 - Connecting Rod Kit - YamahaFeaturesEasy to installSpecsEngine Type4-StrokeProduct NameConnecting Rod KitUnitsKitRiding StyleOff-RoadMaterialForged SteelFitment2015-2025YamahaWR250F2014-2025YamahaYZ250F2021-2023, 2025YamahaYZ250F Monster...

Prox - 09105694 - Piston Kit - 43.44 mm - Yamaha YZ65FeaturesOversized options follow manufacturer piston to cylinder wall clearancesKit includes piston, ring kit, wrist pin, and circlipsSpecsCompression Ratio ImperialStandardUnitsKitBore Size Metric44...

Prox - 09106105 - Piston Kit - 44.97 mm - KTM 65SXFeaturesOversized options follow manufacturer piston to cylinder wall clearancesKit includes piston, ring kit, wrist pin, and circlipsSpecsCompression Ratio ImperialStandardUnitsKitBore Size Metric45.00...

Prox - 09106104 - Piston Kit - 44.96 mm - KTM 65SXFeaturesOversized options follow manufacturer piston to cylinder wall clearancesKit includes piston, ring kit, wrist pin, and circlipsSpecsBore - OversizeStandardProduct NamePiston KitBore - Oversize...

Prox - 09105696 - Piston Kit - 43.46 mm - Yamaha YZ65FeaturesOversized options follow manufacturer piston to cylinder wall clearancesKit includes piston, ring kit, wrist pin, and circlipsSpecsBore - OversizeStandardDisplacement65 ccRiding...

Prox - 09105695 - Piston Kit - 43.45 mm - Yamaha YZ65FeaturesOversized options follow manufacturer piston to cylinder wall clearancesKit includes piston, ring kit, wrist pin, and circlipsSpecsProduct NamePiston KitDisplacement65 ccEngine...

Prox - 09262731 - Valve and Spring Kit - Intake - Husaberg | Husqvarna | KTMFeaturesSteel, nitrided valves for increased durability and less wear under extreme conditionsStronger valve springs deal with the extra weight of the steel valvesSprings are...

Prox - 09262730 - Valve and Spring Kit - Intake - Husqvarna | KTMFeaturesSteel, nitrided valves for increased durability and less wear under extreme conditionsStronger valve springs deal with the extra weight of the steel valvesSprings are made from...

Prox - 09262892 - Valve and Spring Kit - Intake - HondaFeaturesSteel, nitrided valves for increased durability and less wear under extreme conditionsStronger valve springs deal with the extra weight of the steel valvesSprings are made from premium chrome...

Prox - 09262729 - Valve and Spring Kit - Intake - YamahaFeaturesSteel, nitrided valves for increased durability and less wear under extreme conditionsStronger valve springs deal with the extra weight of the steel valvesSprings are made from premium...

Prox - 09262728 - Valve and Spring Kit - Intake - YamahaFeaturesSteel, nitrided valves for increased durability and less wear under extreme conditionsStronger valve springs deal with the extra weight of the steel valvesSprings are made from premium...

Prox - 09262727 - Valve and Spring Kit - Exhaust - Husaberg | Husqvarna | KTMFeaturesSteel, nitrided valves for increased durability and less wear under extreme conditionsStronger valve springs deal with the extra weight of the steel valvesSprings are...

Prox - 09262726 - Valve and Spring Kit - Exhaust - Husqvarna | KTMFeaturesSteel, nitrided valves for increased durability and less wear under extreme conditionsStronger valve springs deal with the extra weight of the steel valvesSprings are made from...

Prox - 09262724 - Valve and Spring Kit - Exhaust - YamahaFeaturesSteel, nitrided valves for increased durability and less wear under extreme conditionsStronger valve springs deal with the extra weight of the steel valvesSprings are made from premium...

Pro Circuit - 09401993 - Engine Plug Kit - Yamaha YZ 450F/250FFeaturesMachined from aircraft-grade aluminumPolished to a mirror finish, then anodized for a one-of-a-kind lookSpecsMaterialAluminumColor/FinishMirrorProduct NamePlug KitRiding...

Pro Circuit - 09401985 - Ignition Cover - Kawasaki KLX 110/LFeaturesCNC-machined from aircraft quality aluminum for strength and durabilityAnodized for surface hardness and reduced normal wearSpecsUnitsEachProduct...

Rekluse - 11313730 - RadiusCX Clutch Kit Replacement - KX 450FeaturesIncludes TorqDrive friction disks, steel drive plates, EXP bases (two halves) and PTFE pads for wedge serviceAvailable for most Offroad and ATV modelsMade in the USANot compatible with...

Rekluse - 11313729 - RadiusCX Clutch Kit Replacement - CRF 450FeaturesIncludes TorqDrive friction disks, steel drive plates, EXP bases (two halves) and PTFE pads for wedge serviceAvailable for most Offroad and ATV modelsMade in the USANot compatible with...

Prox - 09347150 - Top End Gasket Set - Husqvarna/KTMFeaturesPrecision engineering and the use of first-class materials guarantee the quality you demandSpecsRiding StyleStreetEngine Type2-StrokeProduct NameGasket SetUnitsSetRiding StyleOff-RoadTypeTop...

Rekluse - 11313586 - RadiusCX Clutch Kit Replacement - Gas Gas/Husqvarna/KTMFeaturesIncludes TorqDrive friction disks, steel drive plates, EXP bases (two halves) and PTFE pads for wedge serviceAvailable for most Offroad and ATV modelsMade in the USANot...

Rekluse - 11313579 - RadiusCX Clutch Kit Replacement - YZ125FeaturesIncludes TorqDrive friction disks, steel drive plates, EXP bases (two halves) and PTFE pads for wedge serviceAvailable for most Offroad and ATV modelsMade in the USANot compatible with...

Rekluse - 11313577 - RadiusCX Clutch Kit Replacement - KawasakiFeaturesIncludes TorqDrive friction disks, steel drive plates, EXP bases (two halves) and PTFE pads for wedge serviceAvailable for most Offroad and ATV modelsMade in the USANot compatible...

Prox - 09347148 - Top End Gasket Set - Husqvarna/KTMFeaturesPrecision engineering and the use of first-class materials guarantee the quality you demandSpecsEngine Type4-StrokeRiding StyleOff-RoadRiding StyleStreetUnitsSetProduct NameGasket SetTypeTop...

Prox - 09347146 - Top End Gasket Set - Gas Gas/Husqvarna/KTMFeaturesPrecision engineering and the use of first-class materials guarantee the quality you demandSpecsEngine Type2-StrokeProduct NameGasket SetTypeTop EndUnitsSetEngine Type4-StrokeRiding...

Prox - 09347127 - Top End Gasket Set - YamahaFeaturesPrecision engineering and the use of first-class materials guarantee the quality you demandSpecsProduct NameGasket SetTypeTop EndEngine Type4-StrokeUnitsSetRiding...

Prox - 09347140 - Top End Gasket Set - KawasakiFeaturesPrecision engineering and the use of first-class materials guarantee the quality you demandSpecsProduct NameGasket SetTypeTop EndEngine Type4-StrokeRiding...