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
Wossner Piston Kit Yamaha YZ250 1976-1979 72mm 8179D200
WOSSNER
MSRP: $182.00Now: $172.90Was: $182.00The Wossner Piston Kit 8179D200 is engineered specifically for Yamaha YZ250 models from 1976-1979, delivering the precision and durability your 2-stroke demands during aggressive riding conditions...09105571- SKU:
- 09105571
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
- DISPLACEMENT:
- 246 CC
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- TYPE:
- DUAL RING
- BORE - OVERSIZE:
- +2,00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 71.94 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 72.00 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $182.00Now: $172.90Was: $182.00 -
On Sale
Wossner Piston Kit Kawasaki KX80 1988-2000 47.95mm 8197DA
WOSSNER
MSRP: $112.00Now: $106.40Was: $112.00Your KX80's longevity depends on a piston that can handle the demands of 2-stroke performance without sacrificing reliability. The Wossner 8197DA delivers the durability and precision engineering...09105572- SKU:
- 09105572
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 47.95 MM
- BORE SIZE METRIC:
- 48.00 MM
- DISPLACEMENT:
- 79 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SINGLE RING
- UNITS:
- KIT
MSRP: $112.00Now: $106.40Was: $112.00Qty in Cart: 0Quantity:Price:MSRP: $112.00Now: $106.40Was: $112.00Subtotal: -
On Sale
Wossner Piston Kit 57.95mm for 2016-2022 KTM 150 SX 8299DA
WOSSNER
MSRP: $142.00Now: $134.90Was: $142.00A worn or stock piston compromises your 150 SX's power delivery and longevity, especially under sustained high-RPM racing loads. The Wossner 8299DA delivers the durability and precision your engine...09105589- SKU:
- 09105589
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 143 CC
- MODEL:
- STANDARD SERIES
- BORE SIZE METRIC:
- 58.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 57.95 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SINGLE RING
- UNITS:
- KIT
MSRP: $142.00Now: $134.90Was: $142.00 -
On Sale
Wossner Yamaha YZ65 2018-2025 Piston Kit 8306DA
WOSSNER
MSRP: $112.00Now: $106.40Was: $112.00The Wossner YZ65 piston kit is engineered for 2-stroke engines that demand reliability and consistent power delivery. If you're rebuilding after ring wear or preparing for competitive riding, this...09105590- SKU:
- 09105590
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- BORE SIZE METRIC:
- 43.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON SIZE METRIC:
- 43.45 MM
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- SINGLE RING
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 65 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
MSRP: $112.00Now: $106.40Was: $112.00Qty in Cart: 0Quantity:Price:MSRP: $112.00Now: $106.40Was: $112.00Subtotal: -
On Sale
Wossner Piston Kit 67.34mm Kawasaki KX250 1987-1989 8129DA
WOSSNER
MSRP: $162.00Now: $153.90Was: $162.00When you're pushing a 2-stroke KX250 to its limits, piston reliability directly impacts your lap times and engine longevity. The Wossner 8129DA delivers the precision engineering and material quality...09105544- SKU:
- 09105544
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- BORE SIZE METRIC:
- 67.40 MM
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON SIZE METRIC:
- 67.34 MM
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
MSRP: $162.00Now: $153.90Was: $162.00Qty in Cart: 0Quantity:Price:MSRP: $162.00Now: $153.90Was: $162.00Subtotal: -
On Sale
Wossner Piston Kit 55.94mm Kawasaki KX125 1988-1989 8130DA
WOSSNER
MSRP: $132.00Now: $125.40Was: $132.00When you're pushing a KX125 to its limits, piston quality directly determines whether you're winning races or rebuilding engines. The Wossner 8130DA delivers the reliability and power output that...09105546- SKU:
- 09105546
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SINGLE RING
- UNITS:
- KIT
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 55.94 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
MSRP: $132.00Now: $125.40Was: $132.00Qty in Cart: 0Quantity:Price:MSRP: $132.00Now: $125.40Was: $132.00Subtotal: -
Wrench Rabbit Complete Engine Rebuild Kit for 2006-2008 KTM 50 SX WR00003
WRENCH RABBIT
$592.95Engine wear is inevitable on a high-use pit bike like the 2006-2008 KTM 50 SX, but premature failure doesn't have to be. The Wrench Rabbit Complete Engine Rebuild Kit WR00003 supplies every critical...09031630- SKU:
- 09031630
- Availability:
- Ships Same Business Day
- Weight:
- 5.70 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$592.95Qty in Cart: 0Quantity:Price:$592.95Subtotal: -
WRENCH RABBIT Engine Kit - Kawasaki WR00004
WRENCH RABBIT
$1,013.95When your engine reaches the end of its service life, a complete rebuild kit eliminates the guesswork and ensures you're installing quality OEM-equivalent components throughout the entire engine. The...09031631- SKU:
- 09031631
- Availability:
- Ships Same Business Day
- Weight:
- 15.65 LBS
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$1,013.95 -
Wrench Rabbit Complete Engine Rebuild Kit for Kawasaki KX60 1985-2003 WR00005
WRENCH RABBIT
$564.95A worn or damaged engine can rob your KX60 of reliability and performance—and a partial rebuild often leads to premature failure of related components. The Wrench Rabbit Complete Engine Rebuild Kit...09031632- SKU:
- 09031632
- Availability:
- Ships Same Business Day
- Weight:
- 7.50 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$564.95Qty in Cart: 0Quantity:Price:$564.95Subtotal: -
Wrench Rabbit Complete Engine Rebuild Kit for Yamaha YZ250F 2016-2018 WR00008
WRENCH RABBIT
$1,132.95When your YZ250F's engine shows signs of wear—whether from high-mileage racing, a catastrophic failure, or routine maintenance—a complete rebuild is your path back to factory-spec reliability and...09031634- SKU:
- 09031634
- Availability:
- Ships Same Business Day
- Weight:
- 12.30 LBS
- RIDING STYLE:
- UTV
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ATV
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$1,132.95 -
Wrench Rabbit Engine Rebuild Kit for 2014-2015 KTM 250 SX-F WR101-161
WRENCH RABBIT
$1,315.95When your KTM 250 SX-F engine shows signs of wear—whether from hard racing, trail riding, or age—a complete rebuild restores it to like-new performance and reliability. The Wrench Rabbit WR101-161...09031262- SKU:
- 09031262
- Availability:
- Ships Same Business Day
- Weight:
- 12.75 LBS
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$1,315.95 -
Wrench Rabbit Engine Rebuild Kit for Kawasaki KX100 2014-2016 WR101-163
WRENCH RABBIT
$711.95When your Kawasaki KX100 needs a full rebuild, settling for incomplete kits wastes time and invites reliability issues. The Wrench Rabbit Engine Rebuild Kit delivers everything you need to restore...09031264- SKU:
- 09031264
- Availability:
- Ships Same Business Day
- Weight:
- 8.10 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- TYPE:
- ENGINE
- PRODUCT NAME:
- REBUILD KIT
$711.95Qty in Cart: 0Quantity:Price:$711.95Subtotal: -
Wrench Rabbit Engine Rebuild Kit for KTM 200 EXC 2000-2002 WR101-180
WRENCH RABBIT
$1,013.95When your KTM 200 EXC engine has reached the end of its service life, a complete rebuild is the most cost-effective way to restore full performance and reliability. The Wrench Rabbit WR101-180...09031436- SKU:
- 09031436
- Availability:
- Ships Same Business Day
- Weight:
- 11.70 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$1,013.95 -
Wrench Rabbit Engine Rebuild Kit 2014-2016 Yamaha YZ450F WR101-181
WRENCH RABBIT
$1,249.95When your YZ450F needs more than a quick fix, a full engine rebuild restores it to factory specifications and renewed reliability. The Wrench Rabbit Engine Rebuild Kit WR101-181 consolidates every...09031437- SKU:
- 09031437
- Availability:
- Ships Same Business Day
- Weight:
- 16.25 LBS
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$1,249.95 -
Wrench Rabbit Engine Rebuild Kit 2004-2007 Yamaha YFZ450 WR101-186
WRENCH RABBIT
$1,052.95When your YFZ450 engine reaches the end of its service life, a quality rebuild kit saves time and eliminates the guesswork of sourcing individual components. The Wrench Rabbit WR101-186 bundles all...09031438- SKU:
- 09031438
- Availability:
- Ships Same Business Day
- Weight:
- 10.70 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$1,052.95 -
Wrench Rabbit Engine Rebuild Kit for Suzuki RM125 2004-2007 WR101-187
WRENCH RABBIT
$1,013.95Two-stroke engines don't rebuild themselves—and using a piecemeal approach to sourcing gaskets, bearings, and pistons invites compatibility issues and wasted time. The Wrench Rabbit WR101-187...09031439- SKU:
- 09031439
- Availability:
- Ships Same Business Day
- Weight:
- 10.85 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
$1,013.95Qty in Cart: 0Quantity:Price:$1,013.95Subtotal: -
Wrench Rabbit Complete Engine Rebuild Kit for 1995-1996 Honda CR250R WR101-013
WRENCH RABBIT
$828.95A two-stroke engine rebuild demands precision and quality components—this Wrench Rabbit kit delivers both with OEM-equivalent parts engineered specifically for 1995-1996 Honda CR250R motors. Rather...09030953- SKU:
- 09030953
- Availability:
- Ships Same Business Day
- Weight:
- 14.65 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- REBUILD KIT
- MODEL:
- WRENCH RABBIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 2-STROKE
- FEATURES:
- STANDARD COMPRESSION PISTON
- UNITS:
- KIT
$828.95 -
Wrench Rabbit Engine Rebuild Kit for 1997-2001 Honda CR250R WR101-014
WRENCH RABBIT
$867.95A two-stroke engine rebuild demands precision—missing even one component can compromise performance and reliability. The Wrench Rabbit Engine Rebuild Kit for your 1997-2001 Honda CR250R eliminates...09030954- SKU:
- 09030954
- Availability:
- Ships Same Business Day
- Weight:
- 14.65 LBS
- MODEL:
- WRENCH RABBIT
- UNITS:
- KIT
- TYPE:
- ENGINE
- PRODUCT NAME:
- REBUILD KIT
- ENGINE TYPE:
- 2-STROKE
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
$867.95 -
WRENCH RABBIT Engine Kit - Honda WR101-016
WRENCH RABBIT
$867.95A complete engine rebuild requires precision components and meticulous attention to detail—which is why sourcing parts individually from multiple vendors introduces unnecessary risk and delays. The...09030956- SKU:
- 09030956
- Availability:
- Ships Same Business Day
- Weight:
- 13.64 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 2-STROKE
- FEATURES:
- STANDARD COMPRESSION PISTON
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
$867.95Qty in Cart: 0Quantity:Price:$867.95Subtotal: -
Wrench Rabbit Complete Engine Rebuild Kit for 1989-2001 Honda CR500R WR101-017
WRENCH RABBIT
$920.95When your Honda CR500R two-stroke demands a complete overhaul, settling for partial kits means risking engine reliability and performance. The Wrench Rabbit Complete Engine Rebuild Kit eliminates...09030957- SKU:
- 09030957
- Availability:
- Ships Same Business Day
- Weight:
- 18.70 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
$920.95
