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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Wiseco Crankshaft Assembly with Bearing and Gasket for Yamaha YZ125 1998-2000 WPC124
WISECO
$421.95If you're rebuilding a YZ125 two-stroke or pushing your engine to its limits, a worn or damaged crankshaft will quickly become your bottleneck. The Wiseco WPC124 eliminates guesswork with a...09210100- SKU:
- 09210100
- Availability:
- Ships Same Business Day
- Weight:
- 8.06 LBS
- FEATURES:
- INCLUDES BEARING AND GASKET
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- UNITS:
- KIT
- TYPE:
- BOTTOM END
$421.95 -
Wiseco Crankshaft Kit for Kawasaki KX60 1985-2003 and Suzuki RM60 2003 WPC130
WISECO
$339.95The stock crankshaft in your KX60 or RM60 will eventually wear, compromising compression, power delivery, and engine reliability. The Wiseco WPC130 addresses this with a complete bottom-end solution...09210103- SKU:
- 09210103
- Availability:
- Ships Same Business Day
- Weight:
- 5.92 LBS
- STROKE LENGTH METRIC:
- 41.60 MM
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- FEATURES:
- INCLUDES BEARING AND GASKET
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- BOTTOM END
- UNITS:
- KIT
$339.95Qty in Cart: 0Quantity:Price:$339.95Subtotal: -
Wiseco Crankshaft Kit for 2002-2004 Honda CR250R WPC132
WISECO
$459.95If you're running a 2002-2004 Honda CR250R at the edge of its limits, your factory crankshaft assembly is the weak link holding back your potential. The Wiseco WPC132 kit replaces worn or damaged...09210105- SKU:
- 09210105
- Availability:
- Ships Same Business Day
- Weight:
- 12.55 LBS
- STROKE LENGTH METRIC:
- 72.00 MM
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- UNITS:
- KIT
- FEATURES:
- INCLUDES BEARING AND GASKET
- TYPE:
- BOTTOM END
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
$459.95Qty in Cart: 0Quantity:Price:$459.95Subtotal: -
Wiseco Crankshaft Assembly for 1990-2002 Honda CR125R WPC116A
WISECO
$359.95If you're rebuilding a CR125R or pushing your existing engine toward higher RPM performance, crankshaft quality directly impacts your reliability and power output. The Wiseco WPC116A is...09210107- SKU:
- 09210107
- Availability:
- Ships Same Business Day
- Weight:
- 8.26 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- BOTTOM END
- FEATURES:
- INCLUDES BEARING AND GASKET
- MATERIAL:
- STEEL
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
$359.95Qty in Cart: 0Quantity:Price:$359.95Subtotal: -
Wiseco Honda CRF150R 2007-2024 Crankshaft Assembly WPC149
WISECO
$477.95A worn or damaged crankshaft compromises engine reliability and performance—especially in a high-revving four-stroke like the CRF150R. The Wiseco WPC149 assembly gives you a complete,...09210148- SKU:
- 09210148
- Availability:
- Ships Same Business Day
- Weight:
- 7.11 LBS
- STROKE LENGTH METRIC:
- 43.70 MM
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- BOTTOM END
- FEATURES:
- INCLUDES BEARING AND GASKET
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
$477.95Qty in Cart: 0Quantity:Price:$477.95Subtotal: -
Wiseco Engine Rebuild Kit for 1986-1991 Honda CR80R PWR115-100
WISECO
$479.95When your CR80R's engine is worn, a complete rebuild with OEM-equivalent components restores reliability and performance without the guesswork of sourcing individual parts. The Wiseco PWR115-100...09031597- SKU:
- 09031597
- Availability:
- Ships Same Business Day
- Weight:
- 8.05 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 47.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$479.95Qty in Cart: 0Quantity:Price:$479.95Subtotal: -
Wiseco Engine Rebuild Kit for 1992-2002 Honda CR80R PWR115-101
WISECO
$510.95Engine wear is inevitable on a 1992-2002 Honda CR80R, but a complete rebuild doesn't have to mean sourcing parts from multiple suppliers. The Wiseco PWR115-101 Engine Rebuild Kit bundles everything...09031598- SKU:
- 09031598
- Availability:
- Ships Same Business Day
- Weight:
- 8.00 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 47.00 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$510.95 -
Wiseco Engine Rebuild Kit for 1998-1999 Honda CR125R PWR116A-102
WISECO
$549.95When your CR125R's engine has accumulated hours of hard riding, a complete rebuild is the only way to restore compression, throttle response, and reliability. The Wiseco PWR116A-102 kit eliminates...09031601- SKU:
- 09031601
- Availability:
- Ships Same Business Day
- Weight:
- 9.85 LBS
- BORE SIZE METRIC:
- 54.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
$549.95Qty in Cart: 0Quantity:Price:$549.95Subtotal: -
Wiseco Engine Rebuild Kit for 2005-2007 Suzuki RM-Z450 95.50mm PWR142-100
WISECO
$967.84When your RM-Z450's engine reaches its limits, a complete rebuild with OEM-quality components is the only way to restore full performance and reliability. The Wiseco PWR142-100 kit eliminates the...09031614- SKU:
- 09031614
- Availability:
- Ships Same Business Day
- Weight:
- 15.30 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 95.50 MM
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- PRODUCT NAME:
- REBUILD KIT
$967.84Qty in Cart: 0Quantity:Price:$967.84Subtotal: -
Wiseco Engine Rebuild Kit for 2003-2004 Honda CR85R PWR115-103
WISECO
$532.95When your CR85R's engine is worn or damaged, a complete rebuild is the most cost-effective path back to peak performance. The Wiseco Engine Rebuild Kit eliminates the guesswork by bundling all...09031495- SKU:
- 09031495
- Availability:
- Ships Same Business Day
- Weight:
- 7.95 LBS
- BORE SIZE METRIC:
- 47.50 MM
- DISPLACEMENT:
- 85 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- FEATURES:
- PROLITE® PISTON
- MODEL:
- GARAGE BUDDY
- OVERBORE METRIC:
- STANDARD
$532.95 -
Wiseco Engine Rebuild Kit for Yamaha YZ80 1993-2001 PWR122-100
WISECO
$474.95A worn YZ80 engine loses power, reliability, and resale value—but a complete rebuild using OEM-quality components restores it to factory specifications or better. The Wiseco PWR122-100 kit...09031502- SKU:
- 09031502
- Availability:
- Ships Same Business Day
- Weight:
- 7.80 LBS
- DISPLACEMENT:
- 80 CC
- FEATURES:
- PROLITE® PISTON
- BORE SIZE METRIC:
- 47.00 MM
- OVERBORE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$474.95Qty in Cart: 0Quantity:Price:$474.95Subtotal: -
Wiseco Engine Rebuild Kit for 1998-2000 Yamaha YZ125 PWR124-100
WISECO
$588.95Whether you're rebuilding after a blown top end or performing preventive maintenance, the Wiseco Engine Rebuild Kit PWR124-100 gives you a complete, factory-engineered solution for your YZ125. This...09031504- SKU:
- 09031504
- Availability:
- Ships Same Business Day
- Weight:
- 9.70 LBS
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- TYPE:
- ENGINE
- PRODUCT NAME:
- REBUILD KIT
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$588.95Qty in Cart: 0Quantity:Price:$588.95Subtotal: -
Wiseco Engine Rebuild Kit Yamaha YZ125 2002 PWR125-101
WISECO
$534.95A complete engine rebuild is the most critical maintenance a YZ125 can receive, and this Wiseco kit eliminates guesswork by providing every component you need for a proper top and bottom-end overhaul...09031506- SKU:
- 09031506
- Availability:
- Ships Same Business Day
- Weight:
- 9.75 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 125 CC
- FEATURES:
- PROLITE® PISTON
- BORE SIZE METRIC:
- 54.00 MM
- OVERBORE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$534.95Qty in Cart: 0Quantity:Price:$534.95Subtotal: -
Wiseco Engine Rebuild Kit Yamaha YZ250 2002 PWR127-101
WISECO
$649.95A worn YZ250 engine doesn't just cost you performance—it costs you reliability when you need it most. The Wiseco Engine Rebuild Kit delivers a complete top and bottom-end solution, letting you...09031510- SKU:
- 09031510
- Availability:
- Ships Same Business Day
- Weight:
- 13.00 LBS
- PRODUCT NAME:
- REBUILD KIT
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- TYPE:
- ENGINE
- BORE SIZE METRIC:
- 66.40 MM
- OVERBORE METRIC:
- STANDARD
- FEATURES:
- PROLITE® PISTON
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$649.95Qty in Cart: 0Quantity:Price:$649.95Subtotal: -
Wiseco Engine Kit for Kawasaki KX250 1993 PWR128-102
WISECO
$710.95A complete engine rebuild is the most effective way to restore your KX250's performance and reliability after high-mileage use or damage. This Wiseco Engine Kit eliminates the guesswork by bundling...09031511- SKU:
- 09031511
- Availability:
- Ships Same Business Day
- Weight:
- 13.40 LBS
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 66.40 MM
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$710.95Qty in Cart: 0Quantity:Price:$710.95Subtotal: -
Wiseco Engine Rebuild Kit for Kawasaki KX60 1985-2003 PWR130-100
WISECO
$459.95A KX60 engine rebuild demands precision components that can withstand the rigors of competition and high-rpm operation. The Wiseco Engine Rebuild Kit supplies everything you need for a complete top...09031512- SKU:
- 09031512
- Availability:
- Ships Same Business Day
- Weight:
- 14.83 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- DISPLACEMENT:
- 60 CC
- ENGINE TYPE:
- 2-STROKE
- UNITS:
- KIT
- BORE SIZE METRIC:
- 43.00 MM
- FEATURES:
- STANDARD PISTON
- MODEL:
- GARAGE BUDDY
- OVERBORE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
$459.95Qty in Cart: 0Quantity:Price:$459.95Subtotal: -
Wiseco Engine Rebuild Kit for Suzuki RM125 2004-2008 PWR135-100
WISECO
$564.95A complete engine rebuild kit eliminates the guesswork of sourcing individual components—you get everything needed for a proper top and bottom-end overhaul in one package. Wiseco's precision...09031520- SKU:
- 09031520
- Availability:
- Ships Same Business Day
- Weight:
- 10.00 LBS
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 2-STROKE
- BORE SIZE METRIC:
- 54.00 MM
- UNITS:
- KIT
- FEATURES:
- PROLITE® PISTON
- MODEL:
- GARAGE BUDDY
- OVERBORE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
$564.95Qty in Cart: 0Quantity:Price:$564.95Subtotal: -
Wiseco Engine Rebuild Kit Honda CRF250R 2004-2007 PWR143-100
WISECO
$932.95A worn or damaged engine cuts your CRF250R's power and reliability in half. The Wiseco Engine Rebuild Kit delivers OEM-exceeding components in a single package, eliminating the guesswork of sourcing...09031531- SKU:
- 09031531
- Availability:
- Ships Same Business Day
- Weight:
- 5.05 LBS
$932.95Qty in Cart: 0Quantity:Price:$932.95Subtotal: -
Wiseco Engine Rebuild Kit Yamaha YZ450F 2006-2009 PWR151-100
WISECO
$1,010.95A complete engine rebuild demands precision components that restore your YZ450F to factory performance specifications—and this Wiseco kit delivers exactly that. Rather than sourcing pistons, rings,...09031535- SKU:
- 09031535
- Availability:
- Ships Same Business Day
- Weight:
- 14.00 LBS
$1,010.95Qty in Cart: 0Quantity:Price:$1,010.95Subtotal: -
Wiseco Engine Rebuild Kit KTM 125 SX 2007-2015 PWR153-102
WISECO
$664.95When your KTM 125 SX engine has logged serious hours, a full rebuild is the only way to restore original performance and reliability. The Wiseco Engine Rebuild Kit PWR153-102 eliminates the guesswork...09031536- SKU:
- 09031536
- Availability:
- Ships Same Business Day
- Weight:
- 10.65 LBS
- DISPLACEMENT:
- 125 CC
- FEATURES:
- PROLITE® PISTON
- TYPE:
- ENGINE
- BORE SIZE METRIC:
- 54.00 MM
- OVERBORE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$664.95Qty in Cart: 0Quantity:Price:$664.95Subtotal:
