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 Connecting Rod Kit for Kawasaki KX125 1998-2002 P2034
WOSSNER
$122.00A worn or damaged connecting rod directly impacts your KX125's reliability, throttle response, and overall engine longevity. The Wössner P2034 kit delivers a complete crankshaft rebuild solution using proven German engineering and 8620 forged alloy...09230395- SKU:
- 09230395
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- PRODUCT NAME:
- CONNECTING ROD KIT
- STYLE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$122.00 -
Wossner Connecting Rod Kit for 2002-2007 Honda CR250R P2020
WOSSNER
$122.00When you're rebuilding a CR250R engine, you need connecting rods engineered to handle sustained high RPM loads without compromise. The Wossner P2020 kit eliminates the guesswork by pairing precision-forged construction with shot-peened durability, giving...09230396- SKU:
- 09230396
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- STREET
- UNITS:
- KIT
$122.00 -
Wossner Connecting Rod Honda CR80R 1986-2002 P2003
WOSSNER
$112.00If you're rebuilding a CR80R engine, the Wössner Connecting Rod P2003 is the precision component that separates a reliable build from a failure-prone one. This forged alloy rod is engineered to handle the demands of high-RPM operation while maintaining...09230397- SKU:
- 09230397
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- STYLE:
- STANDARD
$112.00Qty in Cart: 0Quantity:Price:$112.00Subtotal: -
Wossner Connecting Rod Kawasaki KX85 2001-2025 P2005
WOSSNER
$112.00A connecting rod failure mid-race can cost you the entire season. The Wössner P2005 is purpose-built to handle the extreme combustion pressures and RPM demands of competitive KX85 riding, delivering the reliability you need when it matters most. Whether...09230398- SKU:
- 09230398
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- STYLE:
- STANDARD
$112.00 -
Wossner Connecting Rod Suzuki RM125 1987-1996 P2015
WOSSNER
$122.00A connecting rod failure mid-season means catastrophic engine damage and lost race time. The Wossner P2015 is purpose-built for RM125 reliability, combining German engineering with materials and manufacturing processes proven across professional racing...09230405- SKU:
- 09230405
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- PRODUCT NAME:
- CONNECTING ROD KIT
- STYLE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$122.00Qty in Cart: 0Quantity:Price:$122.00Subtotal: -
Wossner Connecting Rod Suzuki RM125 2004-2011 P2016
WOSSNER
$122.00A connecting rod is the critical link between your piston and crankshaft—if it fails, your engine is done. The Wössner P2016 is precision-engineered for the RM125 to handle the extreme loads of racing and high-RPM riding, combining German engineering...09230406- SKU:
- 09230406
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- STYLE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$122.00 -
Wossner Connecting Rod Kit for Yamaha YZ125 2005-2021 P2018
WOSSNER
$122.00If you're running your YZ125 hard on the track or trail, a worn or damaged connecting rod will kill power delivery and risk catastrophic engine failure. The Wössner P2018 kit gives you a proven upgrade that restores—or exceeds—OEM reliability while...09230407- SKU:
- 09230407
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
$122.00 -
Wossner Connecting Rod Kawasaki KX250 1978-2008 P2022
WOSSNER
$122.00Your KX250's crankshaft takes a beating on the track, and a worn connecting rod directly compromises throttle response, power delivery, and engine reliability. The Wössner P2022 is engineered to restore OEM performance while handling the extreme loads of...09230409- SKU:
- 09230409
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- RIDING STYLE:
- STREET
- STYLE:
- STANDARD
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
$122.00 -
Wossner Piston Kit 54.45mm for Honda CR125R 1992-1999 8020D050
WOSSNER
$122.00If you're running a Honda CR125R that demands maximum reliability and power output, a quality piston kit is non-negotiable. The Wossner 8020D050 delivers the precision engineering and durability required for consistent performance, whether you're racing...09104720- SKU:
- 09104720
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- +0,50 MM
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 54.50 MM
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON SIZE METRIC:
- 54.45 MM
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- SINGLE RING
$122.00Qty in Cart: 0Quantity:Price:$122.00Subtotal: -
Wossner Piston Kit 53.95mm Honda CR125R 1992-1999 8020DA
WOSSNER
$122.00When running a Honda CR125R at the edge of performance, stock pistons can't handle the demands of high-RPM racing and aggressive riding. The Wossner 8020DA delivers the durability and precision needed to maintain power delivery and engine longevity, even...09104722- SKU:
- 09104722
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- BORE SIZE METRIC:
- 54.00 MM
- PISTON SIZE METRIC:
- 53.95 MM
- TYPE:
- SINGLE RING
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 125 CC
- PISTON MATERIAL:
- FORGED
$122.00Qty in Cart: 0Quantity:Price:$122.00Subtotal: -
Wossner Piston Kit 77mm Yamaha YZ250F 2005-2007 8614DA
WOSSNER
$184.00When you're pushing your YZ250F to the limit, stock pistons won't cut it—you need a unit engineered for sustained high-RPM abuse. The Wossner 8614DA delivers the durability and reliability that separates winners from the rest, with German precision...09104947- SKU:
- 09104947
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- BORE SIZE METRIC:
- 77.00 MM
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PRO SERIES
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 76.96 MM
$184.00Qty in Cart: 0Quantity:Price:$184.00Subtotal: -
Wossner Piston Kit 94.98mm Yamaha YZ450F 2006-2009 8630DC
WOSSNER
$204.00If you're serious about maximizing your YZ450F's power output and longevity, a quality piston kit is non-negotiable. The Wossner 8630DC delivers the durability and precision engineering needed to handle sustained high-RPM abuse without sacrificing...09104952- SKU:
- 09104952
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE - OVERSIZE:
- +0,02 MM
- UNITS:
- KIT
- BORE SIZE METRIC:
- 95.02 MM
- COMPRESSION RATIO IMPERIAL:
- 12.3:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON SIZE METRIC:
- 94.98 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +0.02 MM
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- FORGED
$204.00 -
Wossner Piston Kit 76.96mm Kawasaki KX250F 2006-2009 8635DA
WOSSNER
$184.00If you're running a KX250F between 2006-2009, piston wear directly impacts throttle response, compression, and ring seal integrity—all critical factors in maintaining competitive lap times or reliable trail performance. The Wossner 8635DA delivers...09104953- SKU:
- 09104953
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 77.00 MM
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PRO SERIES
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 76.96 MM
$184.00Qty in Cart: 0Quantity:Price:$184.00Subtotal: -
Wossner Piston Kit 76.97mm Kawasaki KX250F 2006-2009 8635DB
WOSSNER
$184.00When you're pushing a KX250F to its limits, your factory piston won't cut it. This Wossner kit replaces worn or damaged pistons with a precision-engineered assembly that handles sustained high RPM loads and heat stress without compromise. Complete with...09104954- SKU:
- 09104954
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- BORE SIZE METRIC:
- 77.01 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,01 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PRO SERIES
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 76.97 MM
$184.00Qty in Cart: 0Quantity:Price:$184.00Subtotal: -
Wossner Piston Kit 76.98mm Kawasaki KX250F 2006-2009 8635DC
WOSSNER
$184.00When you're pushing a KX250F to its limits, your piston kit needs to survive extreme combustion pressures and thermal cycling without compromise. The Wossner 8635DC delivers German precision engineering with a forged aluminum construction that handles...09104955- SKU:
- 09104955
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- BORE - OVERSIZE:
- +0,02 MM
- BORE - OVERSIZE METRIC:
- +0.02 MM
- BORE SIZE METRIC:
- 77.02 MM
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PRO SERIES
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 76.98 MM
$184.00Qty in Cart: 0Quantity:Price:$184.00Subtotal: -
Wossner Piston Kit 75.97mm for KTM 250 SX-F 2006-2012 8645DB
WOSSNER
$204.00The Wossner 8645DB piston kit is engineered for KTM 250 SX-F riders who demand reliability and responsive power delivery over an entire racing season. Constructed from 4032 T6 forged aluminum, this kit withstands the thermal cycling and combustion...09104957- SKU:
- 09104957
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- BORE - OVERSIZE METRIC:
- +0.01 MM
- COMPRESSION RATIO IMPERIAL:
- 12.9:1
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 76.01 MM
- MODEL:
- PREMIUM SERIES
- PISTON SIZE METRIC:
- 75.97 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- +0,01 MM
- PRODUCT NAME:
- PISTON KIT
$204.00Qty in Cart: 0Quantity:Price:$204.00Subtotal: -
Wrench Rabbit Engine Rebuild Kit for Suzuki RMZ450 2008-2012 WR101-076
WRENCH RABBIT
$1,288.95When your RMZ450's engine reaches the end of its service life, a complete rebuild using OEM-quality components is the most cost-effective path to restored performance and reliability. The Wrench Rabbit Engine Rebuild Kit consolidates all critical...09031011- SKU:
- 09031011
- Availability:
- Ships Same Business Day
- Weight:
- 15.95 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$1,288.95 -
Wrench Rabbit Yamaha YZ125 2005-2016 Complete Engine Rebuild Kit WR101-081
WRENCH RABBIT
$737.95When your Yamaha YZ125 engine shows signs of wear—whether it's lost compression, increased blow-by, or declining power delivery—a complete rebuild is the most cost-effective path to restoring full performance. The Wrench Rabbit WR101-081 kit consolidates...09031016- SKU:
- 09031016
- Availability:
- Ships Same Business Day
- Weight:
- 10.30 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- TYPE:
- ENGINE
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
$737.95 -
Wrench Rabbit Complete Engine Rebuild Kit for Kawasaki KX80 1998-2000 WR101-011
WRENCH RABBIT
$592.95A complete engine rebuild demands precision components that work in concert—and this Wrench Rabbit kit delivers exactly that for your KX80. Whether you're restoring a seized engine or refreshing one after hard miles, this all-in-one solution eliminates...09031058- SKU:
- 09031058
- Availability:
- Ships Same Business Day
- Weight:
- 8.10 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
$592.95 -
Wrench Rabbit Complete Engine Rebuild Kit for 2007-2015 KTM 125 SX WR101-216
WRENCH RABBIT
$985.95When your KTM 125 SX engine hits its limits, a complete rebuild is the only way to restore full performance and reliability. The Wrench Rabbit Complete Engine Rebuild Kit eliminates the guesswork by bundling every critical component—pistons, crankshaft,...09031060- SKU:
- 09031060
- Availability:
- Ships Same Business Day
- Weight:
- 11.00 LBS
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$985.95
