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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On Sale
Wiseco Piston Kit 54.00 mm Oversize for Honda XR100R 1985-2003 4666M05400
WISECO
MSRP: $154.95Now: $132.00Was: $154.95Revitalize your Honda's performance with the Wiseco Piston Kit, meticulously crafted for riders who prioritize power and reliability. This advanced piston kit is engineered to enhance your bike's efficiency, ensuring a thrilling ride every time. Premium...09100329- SKU:
- 09100329
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- COMPRESSION RATIO IMPERIAL:
- 9.4:1
- BORE - OVERSIZE:
- +1,00 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 103,00 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 45.00 MM
MSRP: $154.95Now: $132.00Was: $154.95Qty in Cart: 0Quantity:Price:MSRP: $154.95Now: $132.00Was: $154.95Subtotal: -
On Sale
Wiseco Piston Kit for KTM 85 SX 17/14 2003-2025 RE918M05200
WISECO
MSRP: $149.95Now: $127.00Was: $149.95Wiseco Racer Elite 2-Stroke Series Piston Kit - RE918M05200 Transform your ride with the Wiseco Racer Elite 2-Stroke Series Piston Kit, engineered for riders who prioritize performance and durability. This kit enhances your bike's efficiency, delivering...09105102- SKU:
- 09105102
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 52.00 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
MSRP: $149.95Now: $127.00Was: $149.95Qty in Cart: 0Quantity:Price:MSRP: $149.95Now: $127.00Was: $149.95Subtotal: -
Wossner Connecting Rod Honda CRF250R 2004-2017 P4001
WOSSNER
$174.00Elevate your engine's performance with the WOSSNER Connecting Rod Kit, meticulously engineered for the CRF250. This comprehensive kit includes all necessary components for a seamless crankshaft rebuild, ensuring optimal compatibility and durability...09230428- SKU:
- 09230428
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- STYLE:
- STANDARD
$174.00Qty in Cart: 0Quantity:Price:$174.00Subtotal: -
Wossner Connecting Rod for Suzuki RM-Z250 2007-2025 P4004
WOSSNER
$174.00Elevate your engine's performance with the WOSSNER Connecting Rod RMZ250 P4004. This premium connecting rod kit is meticulously engineered to provide exceptional strength and durability, ensuring your crankshaft rebuild is both reliable and efficient...09230431- SKU:
- 09230431
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- STYLE:
- STANDARD
$174.00Qty in Cart: 0Quantity:Price:$174.00Subtotal: -
Wossner Connecting Rod Suzuki DR-Z400 2000-2023 P4009
WOSSNER
$174.00Upgrade your motorcycle's performance with the WOSSNER Connecting Rod Kit, meticulously engineered for durability and precision. This kit includes all necessary components for a complete crankshaft rebuild, ensuring a perfect fit with OEM bearings and...09230435- SKU:
- 09230435
- Availability:
- Ships Same Business Day
- Weight:
- 1.80 LBS
- RIDING STYLE:
- STREET
- STYLE:
- STANDARD
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- RIDING STYLE:
- ATV
- ENGINE TYPE:
- 4-STROKE
$174.00Qty in Cart: 0Quantity:Price:$174.00Subtotal: -
Wossner Piston Kit 53.94mm Honda CR125R 1988-1989 8125DA
WOSSNER
$132.00Experience unparalleled performance with the WOSSNER Piston Kit 8125DA, designed specifically for 2-stroke engines. This premium kit combines advanced engineering and high-quality materials to deliver superior power and efficiency. Elevate your engine's...09104838- SKU:
- 09104838
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE SIZE METRIC:
- 54.00 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- SINGLE RING
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 124 CC
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON SIZE METRIC:
- 53.94 MM
$132.00 -
Wossner Honda CR125R 1987 Single Ring Piston Kit 8126DA
WOSSNER
$122.95Elevate your engine's performance with the WOSSNER Piston Kit 8126DA, designed specifically for 2-stroke applications. Crafted from high-quality 4032 T6 forged aluminum alloy, this piston kit ensures optimal durability and efficiency, featuring advanced...09104839- SKU:
- 09104839
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 124 CC
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- SINGLE RING
- BORE SIZE METRIC:
- 54.00 MM
- PISTON SIZE METRIC:
- 53.94 MM
$122.95Qty in Cart: 0Quantity:Price:$122.95Subtotal: -
Wossner Piston Kit KTM 350 EXC-F 2012-2016 12.3:1 CR 8885DA
WOSSNER
$214.00Upgrade your KTM EXC-F 350 with the WOSSNER Piston Kit, designed for superior performance and longevity. Crafted from high-quality materials and engineered with precision, this piston kit ensures optimal efficiency and reliability for your 2-stroke...09106127- SKU:
- 09106127
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE SIZE METRIC:
- 88.00 MM
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 87.95 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.3:1
- UNITS:
- KIT
$214.00Qty in Cart: 0Quantity:Price:$214.00Subtotal: -
Wossner Piston Kit KTM 250 SX 2019 8898DB
WOSSNER
$214.00Elevate your engine's performance with the WOSSNER Piston Kit, meticulously engineered for KTM and Husqvarna 2-stroke models. This high-performance piston kit combines advanced materials and innovative design to ensure optimal efficiency and durability,...09106132- SKU:
- 09106132
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE - OVERSIZE:
- +0,01 MM
- BORE SIZE METRIC:
- 95.01 MM
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 94.96 MM
- RIDING STYLE:
- STREET
- BORE - OVERSIZE METRIC:
- +0.01 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- MODEL:
- PREMIUM SERIES
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- 11.8:1
- UNITS:
- KIT
$214.00Qty in Cart: 0Quantity:Price:$214.00Subtotal: -
Wossner Piston Kit 67.4mm Kawasaki KX250 1990-1991 8109DA
WOSSNER
$152.00Experience unparalleled performance with the WOSSNER Piston Kit 8109DA, designed specifically for 2-stroke engines. Crafted from premium materials and engineered for precision, this piston kit enhances your engine's efficiency while ensuring durability...09105532- SKU:
- 09105532
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 67.40 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 249 CC
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 67.34 MM
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
$152.00Qty in Cart: 0Quantity:Price:$152.00Subtotal: -
Wossner Piston Kit Kawasaki KX250 1990-1991 8109DB
WOSSNER
$152.00Experience unparalleled performance with the WOSSNER Piston Kit 8109DB, engineered specifically for 2-stroke engines. This premium kit combines advanced materials and innovative design to enhance efficiency and reduce friction, ensuring a quieter ride...09105533- SKU:
- 09105533
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- UNITS:
- KIT
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 67.35 MM
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +0.01 MM
- BORE SIZE METRIC:
- 67.41 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,01 MM
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- FORGED
- TYPE:
- DUAL RING
$152.00Qty in Cart: 0Quantity:Price:$152.00Subtotal: -
Wossner 54mm Piston Kit for 1981-1984 Suzuki RM125 8124DA
WOSSNER
$132.00Experience unparalleled performance with the WOSSNER Piston Kit 8124DA, designed specifically for 2-stroke engines. Crafted from high-quality 4032 T6 forged aluminum alloy, this piston kit ensures optimal durability and efficiency. With advanced...09105541- SKU:
- 09105541
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 54.00 MM
- TYPE:
- DUAL RING
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 124 CC
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 53.94 MM
- PRODUCT NAME:
- PISTON KIT
$132.00Qty in Cart: 0Quantity:Price:$132.00Subtotal: -
WSM Ring Set 010-925-07
WSM
$23.31Order one per cylinder09120081- SKU:
- 09120081
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- PISTON RING
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- SET
- BORE - OVERSIZE:
- +1,00 MM
$23.31Qty in Cart: 0Quantity:Price:$23.31Subtotal: -
WSM Crankshaft Assembly 010-1018-01WSM
WSM
$810.90Complete crankshaft assembly with connecting rod, Will meet or exceed OEM performance, Trued to OEM specifications, Multi-cylinder applications include main bearings, Rebuildable, Ready for installation09210226- SKU:
- 09210226
- Availability:
- Ships Same Business Day
- Weight:
- 25.30 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MATERIAL:
- STEEL
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$810.90Qty in Cart: 0Quantity:Price:$810.90Subtotal: -
WSM Crankshaft Assembly 010-1019-01WSM
WSM
$803.20Complete crankshaft assembly with connecting rod, Will meet or exceed OEM performance, Trued to OEM specifications, Multi-cylinder applications include main bearings, Rebuildable, Ready for installation09210228- SKU:
- 09210228
- Availability:
- Ships Same Business Day
- Weight:
- 28.59 LBS
- MATERIAL:
- STEEL
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- RIDING STYLE:
- WATERCRAFT
$803.20Qty in Cart: 0Quantity:Price:$803.20Subtotal: -
WSM Crankshaft Assembly 010-1025WSM
WSM
$754.95Complete crankshaft assembly with connecting rod, Will meet or exceed OEM performance, Trued to OEM specifications, Multi-cylinder applications include main bearings, Rebuildable, Ready for installation09210229- SKU:
- 09210229
- Availability:
- Ships Same Business Day
- Weight:
- 20.60 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- RIDING STYLE:
- WATERCRAFT
- MATERIAL:
- STEEL
- UNITS:
- KIT
$754.95Qty in Cart: 0Quantity:Price:$754.95Subtotal: -
WSM Piston Assembly - Yamaha - Standard 010-871K
WSM
$100.50Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...09101984- SKU:
- 09101984
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 75.90 MM
- MODEL:
- ORIGINAL
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
$100.50Qty in Cart: 0Quantity:Price:$100.50Subtotal: -
WSM Piston Assembly - Sea-Doo - +1 mm 010-818-07PK
WSM
$93.60Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...09101263- SKU:
- 09101263
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 82.00 MM
- MODEL:
- PLATINUM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$93.60Qty in Cart: 0Quantity:Price:$93.60Subtotal: -
WSM Top-End Rebuild Kit - Platinum Series - Standard 010-808-10P
WSM
$238.39Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets09030743- SKU:
- 09030743
- Availability:
- Ships Same Business Day
- Weight:
- 3.45 LBS
- MODEL:
- PLATINUM SERIES
- PISTON MATERIAL:
- ALUMINUM
- PISTON SIZE METRIC:
- STANDARD
- UNITS:
- EACH
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- WATERCRAFT
- BORE SIZE METRIC:
- 82.00 MM
- TYPE:
- TOP END
$238.39Qty in Cart: 0Quantity:Price:$238.39Subtotal: -
WSM Top-End Rebuild Kit - Platinum Series - 1 mm 010-809-14P
WSM
$323.56Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets09030748- SKU:
- 09030748
- Availability:
- Ships Same Business Day
- Weight:
- 4.10 LBS
- BORE SIZE METRIC:
- 88.91 MM
- PISTON MATERIAL:
- ALUMINUM
- MODEL:
- PLATINUM SERIES
- PISTON SIZE METRIC:
- +1.00 MM
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
$323.56Qty in Cart: 0Quantity:Price:$323.56Subtotal:
