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
-
Wossner 1984-1985 Honda CR250R 2.00mm Oversize Piston Kit 8156D200
WOSSNER
$182.00Experience unparalleled performance with the WOSSNER Piston Kit 8156D200, engineered for 2-stroke engines. This premium kit combines cutting-edge technology and high-quality materials to deliver exceptional durability and efficiency, ensuring your engine...09105562- SKU:
- 09105562
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 68.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON SIZE METRIC:
- 67.94 MM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- +2,00 MM
- DISPLACEMENT:
- 250 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
$182.00Qty in Cart: 0Quantity:Price:$182.00Subtotal: -
Wossner Piston Kit Honda CR250R 1997-2001 8161DA
WOSSNER
$150.96Experience unparalleled performance with the WOSSNER Piston Kit 8161DA, engineered for high efficiency and durability. This premium 2-stroke piston kit is designed to enhance your engine's performance while minimizing friction and noise, ensuring a...09105563- SKU:
- 09105563
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE SIZE METRIC:
- 66.40 MM
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 66.34 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- SINGLE RING
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
$150.96Qty in Cart: 0Quantity:Price:$150.96Subtotal: -
Wossner Piston Kit Yamaha 49cc 2000 8267DA
WOSSNER
$102.00Experience unparalleled performance and reliability with the WOSSNER Piston Kit 8267DA, designed specifically for 2-stroke engines. Crafted from premium materials and engineered with precision, this piston kit ensures optimal power delivery and...09105587- SKU:
- 09105587
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 40.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 39.95 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 49 CC
- TYPE:
- SINGLE RING
$102.00Qty in Cart: 0Quantity:Price:$102.00Subtotal: -
Wrench Rabbit Complete Engine Rebuild Kit for 2004-2005 KTM 300 EXC WR00002
WRENCH RABBIT
$1,052.95Revitalize your KTM engine with the WRENCH RABBIT Engine Kit WR00002, designed for a comprehensive rebuild. This all-inclusive kit ensures optimal performance and durability, featuring high-quality components tailored for your specific model. Whether...09031629- SKU:
- 09031629
- Availability:
- Ships Same Business Day
- Weight:
- 15.35 LBS
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- STREET
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$1,052.95Qty in Cart: 0Quantity:Price:$1,052.95Subtotal: -
Wrench Rabbit Complete Engine Rebuild Kit for 2016-2017 Honda CRF250R WR101-219
WRENCH RABBIT
$1,092.95Transform your Honda's performance with the WRENCH RABBIT Engine Kit, designed for a seamless and professional rebuild. This comprehensive kit includes all essential components to ensure your engine runs like new, making it the perfect choice for...09031549- SKU:
- 09031549
- Availability:
- Ships Same Business Day
- Weight:
- 13.20 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- UNITS:
- KIT
$1,092.95Qty in Cart: 0Quantity:Price:$1,092.95Subtotal: -
Wrench Rabbit Complete Engine Rebuild Kit for 2010-2013 Honda CRF250R WR101-024
WRENCH RABBIT
$1,092.95Revitalize your Honda engine with the WRENCH RABBIT Engine Kit, designed for a seamless and professional rebuild. This comprehensive kit includes all essential components, ensuring you have everything needed for a successful restoration, from pistons to...09030964- SKU:
- 09030964
- Availability:
- Ships Same Business Day
- Weight:
- 12.91 LBS
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- REBUILD KIT
$1,092.95 -
Wrench Rabbit Engine Rebuild Kit for 2008 Kawasaki KX450F WR101-044
WRENCH RABBIT
$1,211.95Transform your Kawasaki with the WRENCH RABBIT Engine Kit, designed for a seamless and professional rebuild. This comprehensive kit includes everything you need to restore your engine to peak performance, ensuring reliability and durability on every ride...09030981- SKU:
- 09030981
- Availability:
- Ships Same Business Day
- Weight:
- 17.25 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- MODEL:
- WRENCH RABBIT
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
$1,211.95 -
Wrench Rabbit Engine Rebuild Kit for Kawasaki KX65 2002-2004 WR101-049
WRENCH RABBIT
$1,211.95Revitalize your Kawasaki with the WRENCH RABBIT Engine Kit, a comprehensive solution designed for a seamless and professional rebuild. This all-in-one kit includes high-quality components that ensure your engine runs smoothly and efficiently, making it...09030983- SKU:
- 09030983
- Availability:
- Ships Same Business Day
- Weight:
- 16.30 LBS
- PRODUCT NAME:
- REBUILD KIT
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$1,211.95 -
Wrench Rabbit Complete Engine Rebuild Kit for 2004-2011 KTM 105 SX WR101-053
WRENCH RABBIT
$767.95Revitalize your KTM with the WRENCH RABBIT Engine Kit, a comprehensive solution for a professional-grade rebuild. This all-in-one kit includes everything you need to restore your engine's performance, ensuring reliability and longevity for your ride. ...09030991- SKU:
- 09030991
- Availability:
- Ships Same Business Day
- Weight:
- 8.35 LBS
- ENGINE TYPE:
- 2-STROKE
- FEATURES:
- STANDARD COMPRESSION PISTON
- TYPE:
- ENGINE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$767.95Qty in Cart: 0Quantity:Price:$767.95Subtotal: -
Wrench Rabbit Engine Rebuild Kit Kawasaki KX100 2006-2013 WR101-134
WRENCH RABBIT
$711.95Revitalize your Kawasaki with the WRENCH RABBIT Engine Kit, designed for a comprehensive and professional rebuild. This all-in-one solution includes high-quality components to ensure optimal performance and durability, making it the perfect choice for...09031108- SKU:
- 09031108
- Availability:
- Ships Same Business Day
- Weight:
- 8.15 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$711.95Qty in Cart: 0Quantity:Price:$711.95Subtotal: -
Wrench Rabbit Complete Engine Rebuild Kit for 2013-2014 Kawasaki KX450F WR101-144
WRENCH RABBIT
$1,156.95Revitalize your Kawasaki WR101-144 with the WRENCH RABBIT Engine Kit, designed for a seamless and professional rebuild. This comprehensive kit includes all the essential components, ensuring your engine performs at its best. Experience unmatched...09031114- SKU:
- 09031114
- Availability:
- Ships Same Business Day
- Weight:
- 16.05 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- UNITS:
- KIT
$1,156.95Qty in Cart: 0Quantity:Price:$1,156.95Subtotal: -
WSM Motor Mount - XL1200 011-125
WSM
$56.48Replacements for broken or worn-out OEM motor mounts09330007- SKU:
- 09330007
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- ENGINE
- UNITS:
- EACH
- PRODUCT NAME:
- MOUNT
$56.48Qty in Cart: 0Quantity:Price:$56.48Subtotal: -
WSM Pump Plate Cover - Sea-Doo 010-095
WSM
$29.51Replacement long shaft for WSM oil pumps09320081- SKU:
- 09320081
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- PLATE
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- PUMP COVER
- UNITS:
- EACH
$29.51Qty in Cart: 0Quantity:Price:$29.51Subtotal: -
WSM Crankshaft Assembly 010-1061WSM
WSM
$764.06Complete crankshaft assembly with connecting rod, Will meet or exceed OEM performance, Trued to OEM specifications, Multi-cylinder applications include main bearings, Rebuildable, Ready for installation09210486- SKU:
- 09210486
- Availability:
- Ships Same Business Day
- Weight:
- 24.30 LBS
- PRODUCT NAME:
- CRANKSHAFT
- RIDING STYLE:
- WATERCRAFT
- MATERIAL:
- STEEL
- UNITS:
- EACH
$764.06Qty in Cart: 0Quantity:Price:$764.06Subtotal: -
WSM Ring Set 010-920-07
WSM
$35.12Order one per cylinder09120076- SKU:
- 09120076
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE - OVERSIZE:
- +1,00 MM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- SET
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
$35.12Qty in Cart: 0Quantity:Price:$35.12Subtotal: -
XCELDYNE Valve Guide Kit - Exhaust CVGM13005
XCELDYNE
$36.63Highest tolerances for correct valve stem support and fitment in cylinder head, Built from Xceldyne's specified blend of Manganese-bronze, Heat dissipation (thermal conductivity) and valve stem lubrication are substantially increased, which leads to...09260608- SKU:
- 09260608
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- VALVE GUIDE
- MATERIAL:
- MANGANESE-BRONZE
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- UNITS:
- 2 PIECE
$36.63Qty in Cart: 0Quantity:Price:$36.63Subtotal: -
On Sale
Twin Air Oil Filter for KTM 250 EXC 4-Stroke 2003-2005 450 EXC 2003-2005 450 SX-F 2003-2006 450 XC 2008-2010 140014
TWIN AIR
MSRP: $14.95Now: $13.00Was: $14.95Twin Air Oil Filter 140014 Enhance your KTM's performance with the Twin Air Oil Filter 140014, meticulously designed to provide exceptional engine protection for a variety of models. Engineered with cutting-edge materials and technology, this filter...140014- SKU:
- 140014
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- FILTER MEDIA MATERIAL:
- PAPER
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- SECOND FILTER FOR DUAL FILTER APPLICATIONS
- TYPE:
- CARTRIDGE
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
MSRP: $14.95Now: $13.00Was: $14.95Qty in Cart: 0Quantity:Price:MSRP: $14.95Now: $13.00Was: $14.95Subtotal: -
On Sale
VERTEX Piston Kit 23621050
VERTEX
MSRP: $208.95Now: $188.06Was: $208.95All pistons are heat treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life, Cast piston kits are gravity cast aluminum alloy (not...09102053- SKU:
- 09102053
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
- DISPLACEMENT:
- 100 CC
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- CYLINDER DIAMETER METRIC:
- 53.00 MM
- PISTON DIAMETER METRIC:
- 52.95 MM
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
MSRP: $208.95Now: $188.06Was: $208.95Qty in Cart: 0Quantity:Price:MSRP: $208.95Now: $188.06Was: $208.95Subtotal: -
On Sale
VERTEX Piston Kit 23646A
VERTEX
MSRP: $256.95Now: $231.26Was: $256.95All pistons are heat treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life, Cast piston kits are gravity cast aluminum alloy (not...09102055- SKU:
- 09102055
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
MSRP: $256.95Now: $231.26Was: $256.95 -
On Sale
VERTEX Piston Kit - Standard 22809B
VERTEX
MSRP: $189.95Now: $170.96Was: $189.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09101034- SKU:
- 09101034
- Availability:
- Ships Same Business Day
- Weight:
- 0.73 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 250 CC
- PISTON DIAMETER METRIC:
- 66.35 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 66.40 MM
MSRP: $189.95Now: $170.96Was: $189.95
