Dirt Bike Engine
Explore our selection for dirt bike parts for adding horsepower or reliability to a dirt bike's engine. We feature engine parts from Wiseco, Vertex, and more common engine part manufacturers. Get new pistons and gasket kits for re-freshening engines to withstand any conditions you put your bike through!
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- Qty in Cart
- Quantity
- Price
- Subtotal
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PROX Crank Bearing and Seal Kit 23.CBS41088
PROX
$34.43PROX Crank Bearing and Seal Kit 23.CBS41088Made to exact OEM specifications for maximum performance and durability, Includes all necessary bearings/seals for a component's replacement, For use with OEM or Pro X crankshafts09240349- SKU:
- 09240349
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- PRODUCT NAME:
- BEARING AND SEAL KIT
- TYPE:
- BALL
- STYLE:
- 2-STROKE
- APPLICATION:
- CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$34.43 -
PROX Valve Shim Kit 29.VSA948
PROX
$119.74PROX Valve Shim Kit 29.VSA948Made using a specific heat-treatment to ensure hardness for maximum durability and less wear, Precision machined to match exact size, Inexpensive and easy replacement for expensive OEM shims09260941- SKU:
- 09260941
- Availability:
- Ships Same Business Day
- Weight:
- 1.14 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- SHIM KIT
- TYPE:
- VALVE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- STREET
- VALVE SHIM THICKNESS METRIC:
- 1.20 MM - 3.50 MM
$119.74 -
PROX Valve Shim Kit 29.VSA748
PROX
$119.74PROX Valve Shim Kit 29.VSA748Made using a specific heat-treatment to ensure hardness for maximum durability and less wear, Precision machined to match exact size, Inexpensive and easy replacement for expensive OEM shims09261018- SKU:
- 09261018
- Availability:
- Ships Same Business Day
- Weight:
- 0.93 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SHIM KIT
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 1.20 MM - 3.50 MM
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
$119.74 -
PROX Valve and Spring Kit 28.SIS2424-2
PROX
$218.58PROX Valve and Spring Kit 28.SIS2424-2Replaces the OEM valves and valve springs, Steel, nitrided valves for increased durability and less wear under extreme conditions, Stronger valve springs deal with the extra weight of the steel valves, Springs are...09261024- SKU:
- 09261024
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- PRODUCT NAME:
- SPRING KIT
- TYPE:
- VALVE
- MATERIAL:
- STEEL
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$218.58 -
PROX Valve and Spring Kit 28.SIS6329-2
PROX
$161.82PROX Valve and Spring Kit 28.SIS6329-2Replaces the OEM valves and valve springs, Steel, nitrided valves for increased durability and less wear under extreme conditions, Stronger valve springs deal with the extra weight of the steel valves, Springs are...09261436- SKU:
- 09261436
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- SPRING KIT
- TYPE:
- VALVE
$161.82 -
PROX Valve and Spring Kit 28.SES4335-1
PROX
$161.82PROX Valve and Spring Kit 28.SES4335-1Replaces the OEM valves and valve springs, Steel, nitrided valves for increased durability and less wear under extreme conditions, Stronger valve springs deal with the extra weight of the steel valves, Springs are...09261457- SKU:
- 09261457
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- SPRING KIT
- MATERIAL:
- STEEL
- APPLICATION:
- EXHAUST
- TYPE:
- VALVE
$161.82 -
PROX Valve and Spring Kit 28.SIS2402-2
PROX
$234.18PROX Valve and Spring Kit 28.SIS2402-2Replaces the OEM valves and valve springs, Steel, nitrided valves for increased durability and less wear under extreme conditions, Stronger valve springs deal with the extra weight of the steel valves, Springs are...09261460- SKU:
- 09261460
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- PRODUCT NAME:
- SPRING KIT
- TYPE:
- VALVE
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
- UNITS:
- KIT
$234.18 -
PROX Piston Kit 01.1320.A2
PROX
$151.02PROX Piston Kit 01.1320.A2Manufactured in Japan and designed to be OEM replacement, Cast from a high-silicon-content aluminum alloy that meets or exceeds OEM specifications, then CNC-machined to extremely close tolerances, Pistons supplied in a kit...PX4430C- SKU:
- PX4430C
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- RIDING STYLE:
- OFF-ROAD
- PISTON DIAMETER METRIC:
- 66.36 MM
- PISTON SIZE METRIC:
- STANDARD SIZE A
- BORE SIZE METRIC:
- 66.36 MM
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
$151.02 -
PROX Exhaust Valve 28.6520-1
PROX
$54.95PROX Exhaust Valve 28.6520-1Manufactured to the highest precision and quality, Constructed to meet OEM specifications, Available in standard sizes only09260688- SKU:
- 09260688
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$54.95 -
PROX Top End Gasket Set - Kawasaki/Suzuki 35.4334
PROX
$59.95PROX Top End Gasket Set Kawasaki/Suzuki 35.4334PROX Top End Gasket Set - Kawasaki/Suzuki09345766- SKU:
- 09345766
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET SET
- UNITS:
- SET
$59.95Qty in Cart: 0Quantity:Price:$59.95Subtotal: -
PROX Valve and Spring Kit 28.SIS1403-2
PROX
$157.34PROX Valve and Spring Kit 28.SIS1403-2Replaces the OEM valves and valve springs, Steel, nitrided valves for increased durability and less wear under extreme conditions, Stronger valve springs deal with the extra weight of the steel valves, Springs are...09261020- SKU:
- 09261020
- Availability:
- Ships Same Business Day
- Weight:
- 0.34 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SPRING KIT
- UNITS:
- KIT
- TYPE:
- VALVE
$157.34 -
PROX Connecting Rod Kit 03.6011
PROX
$109.95PROX Connecting Rod Kit 03.6011Come complete with crankpin, big-end bearing, small-end bearing and washers, Easy to install09230625- SKU:
- 09230625
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- CONNECTING ROD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$109.95 -
PROX Crank Bearing and Seal Kit 23.CBS61003
PROX
$93.98PROX Crank Bearing and Seal Kit 23.CBS61003Made to exact OEM specifications for maximum performance and durability, Includes all necessary bearings/seals for a component's replacement, For use with OEM or Pro X crankshafts09240360- SKU:
- 09240360
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- PRODUCT NAME:
- BEARING AND SEAL KIT
- TYPE:
- BALL
- APPLICATION:
- CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- 2-STROKE
- UNITS:
- KIT
$93.98 -
On Sale
PROX Piston Kit 01.2109.B
PROX
MSRP: $98.44Now: $59.00Was: $98.44PROX Piston Kit 01.2109.BManufactured in Japan and designed to be OEM replacement, Cast from a high-silicon-content aluminum alloy that meets or exceeds OEM specifications, then CNC-machined to extremely close tolerances, Pistons supplied in a kit...PX7109B- SKU:
- PX7109B
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE SIZE METRIC:
- 46.94 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- ENGINE TYPE:
- 2-STROKE
- PISTON SIZE METRIC:
- +0.01 MM
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- EACH
- PISTON DIAMETER METRIC:
- 46.94 MM
- RIDING STYLE:
- OFF-ROAD
MSRP: $98.44Now: $59.00Was: $98.44Qty in Cart: 0Quantity:Price:MSRP: $98.44Now: $59.00Was: $98.44Subtotal: -
PROX Gasket Kit - Complete - KTM 34.6019
PROX
$96.10PROX Gasket Kit Complete KTM 34.6019PROX Gasket Kit - Complete - KTM09345614- SKU:
- 09345614
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
$96.10Qty in Cart: 0Quantity:Price:$96.10Subtotal: -
HINSON RACING Engine Plug Kit - Honda EPK489
HINSON RACING
$69.99HINSON RACING Engine Plug Kit Honda EPK489Precision-machined from billet aluminum, Machined Hinson logos, Made in the U.S.A.09500539- SKU:
- 09500539
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- PLUG KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- BILLET ALUMINUM
- TYPE:
- ENGINE
$69.99 -
HINSON RACING Engine Plug Kit - Honda EPK494
HINSON RACING
$69.99HINSON RACING Engine Plug Kit Honda EPK494Precision-machined from billet aluminum, Machined Hinson logos, Made in the U.S.A.09500540- SKU:
- 09500540
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BILLET ALUMINUM
- PRODUCT NAME:
- PLUG KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- ENGINE
$69.99Qty in Cart: 0Quantity:Price:$69.99Subtotal: -
HINSON RACING Oil Filler Cap - Honda OC154X
HINSON RACING
$19.99HINSON RACING Oil Filler Cap Honda OC154XMachined from T-6 aluminum, Replace the stock plastic plug, Give your ATV that "factory" look, Used by race teams worldwide, Made in the U.S.A.09500614- SKU:
- 09500614
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- CAP
- TYPE:
- OIL FILLER
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$19.99Qty in Cart: 0Quantity:Price:$19.99Subtotal: -
HINSON RACING Oil Filler Cap - Yamaha OC213
HINSON RACING
$19.99HINSON RACING Oil Filler Cap Yamaha OC213Machined from T-6 aluminum, Replace the stock plastic plug, Give your ATV that "factory" look, Used by race teams worldwide, Made in the U.S.A.09500615- SKU:
- 09500615
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- CAP
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- OIL FILLER
$19.99Qty in Cart: 0Quantity:Price:$19.99Subtotal: -
HINSON RACING Oil Filler Cap - RMZ/LTR OC230
HINSON RACING
$19.99HINSON RACING Oil Filler Cap RMZ/LTR OC230Machined from T-6 aluminum, Replace the stock plastic plug, Give your ATV that "factory" look, Used by race teams worldwide, Made in the U.S.A.09500617- SKU:
- 09500617
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- UNITS:
- EACH
- COLOR/FINISH:
- POLISHED
- PRODUCT NAME:
- CAP
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- OIL FILLER
$19.99Qty in Cart: 0Quantity:Price:$19.99Subtotal:
