Dirt Bike Engine
Dirt Bike Engine Parts at JJ Motorsports
Discover a full range of dirt bike engine components for rebuilding or upgrading your performance from JJ Motorsports. From crankshafts to cylinder heads and piston kits, these precision-engineered components ensure reliable performance. For additional upgrades, check out our full selection of off-road dirt bike parts to keep your engine running at peak efficiency on the track or trails.
Shop trusted brands like Wiseco for forged piston kits and K&N for high-flow oil filters. Explore related categories such as Dirt Bike Air and Fuel for intake upgrades or Dirt Bike Exhaust for complete systems.
Browse our in-stock inventory below with same-day shipping and expert support. Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
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WORKS CONNECTION Engine Timing Plug - Red 24-575
WORKS CONNECTION
$49.95Precision-machined from 6061 T-6 aluminum, Simple positive installation with an Allen wrench, Set of two plugs replaces the stock plugs, Polished to a mirror finish prior to anodizing, resulting in a brilliant look, Anodized finish, Made in the U.S.A.09500111- SKU:
- 09500111
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- RED
- PRODUCT NAME:
- PLUG
- RIDING STYLE:
- STREET
- TYPE:
- ENGINE
- UNITS:
- SET
- MATERIAL:
- 6061 T-6 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
$49.95Qty in Cart: 0Quantity:Price:$49.95Subtotal: -
Wossner Connecting Rod KTM 250 EXC 2000-2005 P2023
WOSSNER
$122.00Upgrade your engine's performance with the WOSSNER Connecting Rod Kit, meticulously engineered for optimal compatibility and durability. This comprehensive kit includes all necessary components for a complete crankshaft rebuild, ensuring a perfect fit...09230410- SKU:
- 09230410
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- STYLE:
- STANDARD
$122.00 -
Wossner Connecting Rod Suzuki RM250 2003-2010 P2025
WOSSNER
$122.00Elevate your motorcycle's performance with the WOSSNER Connecting Rod RM250 P2025, meticulously crafted for durability and precision. This connecting rod kit is engineered to seamlessly integrate with your OEM components, ensuring a reliable rebuild of...09230411- SKU:
- 09230411
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- STYLE:
- STANDARD
$122.00Qty in Cart: 0Quantity:Price:$122.00Subtotal: -
Wossner Connecting Rod for Honda CRF450R 2002-2008 P4026
WOSSNER
$174.00The WOSSNER Connecting Rod Kit for the CRF450 is meticulously engineered to provide unparalleled performance and durability for your crankshaft rebuild. Crafted from high-quality 8620 forged alloy and designed to fit OEM bearings and crank pins, this...09230441- SKU:
- 09230441
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
- PRODUCT NAME:
- CONNECTING ROD KIT
- STYLE:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$174.00Qty in Cart: 0Quantity:Price:$174.00Subtotal: -
Wossner Connecting Rod Honda CRF450R 2009-2016 P4027
WOSSNER
$174.00Enhance the performance and durability of your CRF450 with the WOSSNER Connecting Rod Kit. This meticulously engineered kit includes everything necessary for a complete crankshaft rebuild, ensuring a perfect fit with OEM components. Crafted from premium...09230442- SKU:
- 09230442
- Availability:
- Ships Same Business Day
- Weight:
- 1.60 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- STYLE:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$174.00Qty in Cart: 0Quantity:Price:$174.00Subtotal: -
Wossner Connecting Rod for KTM 250 EXC 2001-2006 P4048
WOSSNER
$174.00Elevate your engine performance with the WOSSNER Connecting Rod Kit, meticulously crafted for the EXC250. This kit includes everything necessary for a comprehensive crankshaft rebuild, ensuring a perfect fit with OEM components for optimal reliability...09230450- SKU:
- 09230450
- Availability:
- Ships Same Business Day
- Weight:
- 2.05 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- STANDARD
- UNITS:
- KIT
$174.00Qty in Cart: 0Quantity:Price:$174.00Subtotal: -
Wossner Piston Kit KTM 250 SX-F 2016-2022 8923DB
WOSSNER
$224.00Enhance your bike's performance with the WOSSNER Piston Kit, meticulously engineered for 2-stroke engines. This high-performance piston kit is designed to provide superior durability and efficiency, ensuring a smoother ride and improved power delivery. ...09106135- SKU:
- 09106135
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 78.01 MM
- COMPRESSION RATIO IMPERIAL:
- 14.4:1
- BORE - OVERSIZE:
- +0,01 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PREMIUM SERIES
- PISTON SIZE METRIC:
- 77.97 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$224.00 -
Wossner Piston Kit Yamaha YZ450F 2018-2019 12.9:1 8949DA
WOSSNER
$204.00Enhance your Yamaha YZ 450 F's performance with the WOSSNER Piston Kit, expertly engineered for superior durability and efficiency. This high-quality piston kit is designed to deliver optimal power and smooth operation, ensuring your ride is both...09106137- SKU:
- 09106137
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE - OVERSIZE:
- STANDARD
- PISTON SIZE METRIC:
- 96.96 MM
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 97.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.9:1
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PRO SERIES
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
$204.00Qty in Cart: 0Quantity:Price:$204.00Subtotal: -
Wossner Piston Ring Set KTM 250 SX-F 2006-2012 TPR76.00
WOSSNER
$38.50Upgrade your engine's performance with the WOSSNER Piston Ring Set designed specifically for KTM models. This replacement ring set ensures optimal sealing and enhances the efficiency of your engine, providing improved power and reliability. Crafted with...09120863- SKU:
- 09120863
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON RING SET
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- BORE SIZE METRIC:
- 76.00 MM
$38.50Qty in Cart: 0Quantity:Price:$38.50Subtotal: -
MOOSE RACING Crank Bearing - KDX/JR50 24-1067
MOOSE RACING
$43.95Precision crank bearings, Kits contain right and left crankshaft bearings, Seals designed with a fluorocarbon lip to reduce dry start friction on 2-stroke engines09240102- SKU:
- 09240102
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- ATV
- TYPE:
- BALL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- CRANKSHAFT
- RIDING STYLE:
- STREET
$43.95 -
On Sale
PROX Exhaust Valve 28.1227-1
PROX
MSRP: $29.95Now: $25.00Was: $29.95Manufactured to the highest precision and quality, Constructed to meet OEM specifications, Available in standard sizes only09260668- SKU:
- 09260668
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- UNITS:
- EACH
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
MSRP: $29.95Now: $25.00Was: $29.95 -
On Sale
PROX Exhaust Valve 28.1407-1
PROX
MSRP: $44.95Now: $38.00Was: $44.95Manufactured to the highest precision and quality, Constructed to meet OEM specifications, Available in standard sizes only09260677- SKU:
- 09260677
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
MSRP: $44.95Now: $38.00Was: $44.95Qty in Cart: 0Quantity:Price:MSRP: $44.95Now: $38.00Was: $44.95Subtotal: -
On Sale
PROX Intake Valve and Spring Kit 28.SIS3338-2
PROX
MSRP: $149.95Now: $127.00Was: $149.95Replaces 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 made from premium chrome vanadium steel...09261461- SKU:
- 09261461
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- SPRING KIT
- TYPE:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- TI-STEEL
MSRP: $149.95Now: $127.00Was: $149.95 -
On Sale
PROX Valve and Spring Kit 28.SIS4341-2
PROX
MSRP: $149.95Now: $127.00Was: $149.95Replaces 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 made from premium chrome vanadium steel...09261465- SKU:
- 09261465
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- SPRING KIT
- TYPE:
- VALVE
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $149.95Now: $127.00Was: $149.95 -
On Sale
PROX Top End Gasket Set - Yamaha 35.2418
PROX
MSRP: $69.95Now: $59.00Was: $69.95PROX Top End Gasket Set - Yamaha09345708- SKU:
- 09345708
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
MSRP: $69.95Now: $59.00Was: $69.95Qty in Cart: 0Quantity:Price:MSRP: $69.95Now: $59.00Was: $69.95Subtotal: -
On Sale
PROX Top End Gasket Set - Suzuki 35.3122
PROX
MSRP: $19.95Now: $17.00Was: $19.95PROX Top End Gasket Set - Suzuki09345717- SKU:
- 09345717
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
MSRP: $19.95Now: $17.00Was: $19.95Qty in Cart: 0Quantity:Price:MSRP: $19.95Now: $17.00Was: $19.95Subtotal: -
On Sale
PROX Top End Gasket Set - Suzuki 35.3311
PROX
MSRP: $34.95Now: $30.00Was: $34.95PROX Top End Gasket Set - Suzuki09345728- SKU:
- 09345728
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- SET
MSRP: $34.95Now: $30.00Was: $34.95Qty in Cart: 0Quantity:Price:MSRP: $34.95Now: $30.00Was: $34.95Subtotal: -
On Sale
PROX Top End Gasket Set - Suzuki 35.3337
PROX
MSRP: $70.96Now: $60.00Was: $70.96PROX Top End Gasket Set - Suzuki09345737- SKU:
- 09345737
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- SET
MSRP: $70.96Now: $60.00Was: $70.96Qty in Cart: 0Quantity:Price:MSRP: $70.96Now: $60.00Was: $70.96Subtotal: -
On Sale
PROX Top End Gasket Set - Kawasaki 35.4215
PROX
MSRP: $39.95Now: $34.00Was: $39.95PROX Top End Gasket Set - Kawasaki09345756- SKU:
- 09345756
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
- UNITS:
- SET
MSRP: $39.95Now: $34.00Was: $39.95Qty in Cart: 0Quantity:Price:MSRP: $39.95Now: $34.00Was: $39.95Subtotal: -
On Sale
PROX Top End Gasket Set - Kawasaki 35.4409
PROX
MSRP: $44.95Now: $38.00Was: $44.95PROX Top End Gasket Set - Kawasaki09345770- SKU:
- 09345770
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
MSRP: $44.95Now: $38.00Was: $44.95Qty in Cart: 0Quantity:Price:MSRP: $44.95Now: $38.00Was: $44.95Subtotal:
