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 Connecting Rod Honda CR125R 1988-2007 P2009
WOSSNER
MSRP: $122.00Now: $115.90Was: $122.00The Wössner Connecting Rod for your CR125R is engineered to handle the demands of competitive riding and high-rpm operation without compromise. A quality connecting rod is non-negotiable for...09230393- SKU:
- 09230393
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
MSRP: $122.00Now: $115.90Was: $122.00Qty in Cart: 0Quantity:Price:MSRP: $122.00Now: $115.90Was: $122.00Subtotal: -
On Sale
Wossner Connecting Rod Yamaha YZ125 2001-2004 P2017
WOSSNER
MSRP: $122.00Now: $115.90Was: $122.00A connecting rod is critical to crankshaft integrity—it's the component that translates combustion force into rotational power, and any weakness here compromises engine reliability and performance...09230394- SKU:
- 09230394
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
MSRP: $122.00Now: $115.90Was: $122.00Qty in Cart: 0Quantity:Price:MSRP: $122.00Now: $115.90Was: $122.00Subtotal: -
On Sale
Wossner Piston Kit 44.45mm Kawasaki KX65 2000-2025 8196DA
WOSSNER
MSRP: $102.00Now: $96.90Was: $102.00Stock pistons wear out under sustained racing loads, causing compression loss and power degradation. The Wossner 8196DA delivers precision-engineered durability with 4032 T6 forged aluminum and a...09104873- SKU:
- 09104873
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 64 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- SINGLE RING
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 44.50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 44.45 MM
MSRP: $102.00Now: $96.90Was: $102.00Qty in Cart: 0Quantity:Price:MSRP: $102.00Now: $96.90Was: $102.00Subtotal: -
On Sale
Wossner Piston Kit Yamaha YZ250 1999-2025 66.35mm 8216DA
WOSSNER
MSRP: $152.00Now: $144.40Was: $152.00The Wossner 8216DA piston kit delivers the reliability and performance demanded by 2-stroke racers who can't afford downtime or power loss. Purpose-built for the YZ250 platform across three decades...09104877- SKU:
- 09104877
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 249 CC
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 66.40 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 66.35 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $152.00Now: $144.40Was: $152.00 -
On Sale
Wossner Piston Kit Yamaha YZ250 1999-2026 66.36mm 8216DB
WOSSNER
MSRP: $152.00Now: $144.40Was: $152.00The Wossner 8216DB piston kit is engineered for YZ250 2-stroke engines that demand reliability under sustained high RPM operation. Factory OEM pistons wear quickly under racing conditions—this kit's...09104878- SKU:
- 09104878
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- DISPLACEMENT:
- 249 CC
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
- BORE SIZE METRIC:
- 66.41 MM
- PISTON SIZE METRIC:
- 66.36 MM
- BORE - OVERSIZE:
- +0,01 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $152.00Now: $144.40Was: $152.00 -
On Sale
Wossner Piston Kit 71.94mm KTM 300 EXC 2004-2005 8219DA
WOSSNER
MSRP: $192.00Now: $182.40Was: $192.00When you're pushing a 2-stroke to its limits, a worn or stock piston becomes your weakest link. The Wossner 8219DA delivers the reliability and efficiency you need to maintain peak power delivery and...09104880- SKU:
- 09104880
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- BORE SIZE METRIC:
- 72.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 249 CC
- RIDING STYLE:
- STREET
- TYPE:
- DUAL RING
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 71.94 MM
- UNITS:
- KIT
- DISPLACEMENT:
- 293 CC
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
MSRP: $192.00Now: $182.40Was: $192.00Qty in Cart: 0Quantity:Price:MSRP: $192.00Now: $182.40Was: $192.00Subtotal: -
On Sale
Wossner Piston Kit 71.95mm KTM 300 EXC 2004-2005 8219DB
WOSSNER
MSRP: $192.00Now: $182.40Was: $192.00If you're running a KTM 300 EXC at the edge of performance, your piston is your most critical wear item. The Wossner 8219DB delivers the durability and efficiency required for sustained high-RPM...09104881- SKU:
- 09104881
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- BORE - OVERSIZE:
- +0,01 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 71.95 MM
- BORE SIZE METRIC:
- 72.01 MM
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- TYPE:
- DUAL RING
- BORE - OVERSIZE METRIC:
- +0.01 MM
- DISPLACEMENT:
- 293 CC
MSRP: $192.00Now: $182.40Was: $192.00Qty in Cart: 0Quantity:Price:MSRP: $192.00Now: $182.40Was: $192.00Subtotal: -
On Sale
Wossner Piston Kit 53.95mm 2014-2025 Husqvarna TC125 8220DA
WOSSNER
MSRP: $122.00Now: $115.90Was: $122.00When you're pushing a TC125 to its limits, your piston becomes the critical link between combustion and power delivery. The Wössner 8220DA keeps that link strong with purpose-built engineering that...09104884- SKU:
- 09104884
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE SIZE METRIC:
- 54.00 MM
- TYPE:
- SINGLE RING
- UNITS:
- KIT
- DISPLACEMENT:
- 124 CC
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 53.95 MM
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
MSRP: $122.00Now: $115.90Was: $122.00 -
On Sale
Wossner Piston Kit 53.96mm 2007-2023 KTM 125 SX 8220DB
WOSSNER
MSRP: $122.00Now: $115.90Was: $122.00When your 2-stroke engine demands reliability under sustained high-load conditions, OEM pistons fall short of the mark. The Wössner 8220DB delivers the durability and reduced friction that separates...09104885- SKU:
- 09104885
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SINGLE RING
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,01 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE SIZE METRIC:
- 54.01 MM
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 53.96 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
MSRP: $122.00Now: $115.90Was: $122.00 -
On Sale
Wossner 85.93mm Piston Kit Kawasaki KX500 1988-2004 8228DA
WOSSNER
MSRP: $192.00Now: $182.40Was: $192.00The Wossner 85.93mm Piston Kit is engineered for KX500 2-stroke engines that demand reliability through extended competition seasons and high-RPM abuse. A complete top-end refresh with Wossner's...09104889- SKU:
- 09104889
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
- DISPLACEMENT:
- 499 CC
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 86.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 85.93 MM
MSRP: $192.00Now: $182.40Was: $192.00 -
On Sale
Wossner Piston Kit for KTM 65 SX 2009-2025 8241DA
WOSSNER
MSRP: $102.00Now: $96.90Was: $102.00If you're running a KTM 65 SX and serious about consistent power delivery across repeated heat cycles, a quality piston kit is non-negotiable. The Wossner 8241DA replaces worn pistons that cause...09104890- SKU:
- 09104890
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE SIZE METRIC:
- 45.02 MM
- DISPLACEMENT:
- 64 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- SINGLE RING
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 44.96 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
MSRP: $102.00Now: $96.90Was: $102.00 -
On Sale
Wossner Piston Kit 45.03mm for KTM 65 SX 2009-2025 Husqvarna TC65 2017-2025 GasGas MC65 2021-2025 8241DB
WOSSNER
MSRP: $102.00Now: $96.90Was: $102.00The Wossner Piston Kit 8241DB delivers the precision engineering and durability demanded by serious 2-stroke racers and mechanics. Factory OEM pistons wear quickly under high RPM loads—this...09104891- SKU:
- 09104891
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 45.03 MM
- TYPE:
- SINGLE RING
- DISPLACEMENT:
- 64 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON SIZE METRIC:
- 44.97 MM
- RIDING STYLE:
- OFF-ROAD
MSRP: $102.00Now: $96.90Was: $102.00 -
On Sale
Wossner Piston Kit Honda CR125R 1985-1986 8127DA
WOSSNER
MSRP: $132.00Now: $125.40Was: $132.00If you're rebuilding a CR125R or pushing your engine harder, piston longevity and ring seal integrity directly impact reliability and power delivery. The Wossner 8127DA delivers German-engineered...09105542- SKU:
- 09105542
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 123 CC
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 54.00 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
- PISTON SIZE METRIC:
- 53.94 MM
MSRP: $132.00Now: $125.40Was: $132.00Qty in Cart: 0Quantity:Price:MSRP: $132.00Now: $125.40Was: $132.00Subtotal: -
On Sale
Wossner Piston Kit Kawasaki KX250 1987-1989 67.35mm 8129DB
WOSSNER
MSRP: $162.00Now: $153.90Was: $162.00Two-stroke engines demand pistons engineered for extreme combustion pressures and rapid cycling—stock components simply can't handle sustained high-RPM performance. The Wossner 8129DB delivers the...09105545- SKU:
- 09105545
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- BORE SIZE METRIC:
- 67.41 MM
- UNITS:
- KIT
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 67.35 MM
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +0.01 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
MSRP: $162.00Now: $153.90Was: $162.00Qty in Cart: 0Quantity:Price:MSRP: $162.00Now: $153.90Was: $162.00Subtotal: -
On Sale
Wossner Piston Kit Yamaha YZ250 1988-1991 8134D150
WOSSNER
MSRP: $182.00Now: $172.90Was: $182.00If you're running a YZ250 two-stroke and want reliable power without sacrificing durability, a quality piston kit is non-negotiable. The Wossner 8134D150 delivers the precision engineering and...09105549- SKU:
- 09105549
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
- BORE - OVERSIZE METRIC:
- +1.50 MM
- DISPLACEMENT:
- 246 CC
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 69.50 MM
- PISTON SIZE METRIC:
- 69.44 MM
- TYPE:
- DUAL RING
- BORE - OVERSIZE:
- +1,50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
MSRP: $182.00Now: $172.90Was: $182.00Qty in Cart: 0Quantity:Price:MSRP: $182.00Now: $172.90Was: $182.00Subtotal: -
Wrench Rabbit Engine Rebuild Kit for KTM 50 SX 2009-2012 WR101-158
WRENCH RABBIT
$683.95A two-stroke engine rebuild demands precision components that won't compromise performance or reliability. The Wrench Rabbit Engine Rebuild Kit for KTM 50 SX delivers everything you need in one...09031259- SKU:
- 09031259
- Availability:
- Ships Same Business Day
- Weight:
- 5.70 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$683.95Qty in Cart: 0Quantity:Price:$683.95Subtotal: -
Wrench Rabbit Engine Kit Suzuki RMZ250 2004 WR101-070
WRENCH RABBIT
$1,092.95When your Suzuki RMZ250 two-stroke engine shows wear, a complete rebuild with OEM-quality components is the most reliable path to restoring peak performance. The Wrench Rabbit Engine Kit delivers...09031006- SKU:
- 09031006
- Availability:
- Ships Same Business Day
- Weight:
- 12.15 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$1,092.95Qty in Cart: 0Quantity:Price:$1,092.95Subtotal: -
Wrench Rabbit Engine Kit Suzuki RM-Z250 2007-2009 WR101-073
WRENCH RABBIT
$1,211.95A complete engine rebuild requires precision components and quality materials—this kit eliminates guesswork by bundling everything you need in one package. Whether you're refreshing a tired RM-Z250...09031008- SKU:
- 09031008
- Availability:
- Ships Same Business Day
- Weight:
- 13.50 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
$1,211.95Qty in Cart: 0Quantity:Price:$1,211.95Subtotal: -
Wrench Rabbit Complete Engine Rebuild Kit for Suzuki RMZ250 2010-2012 WR101-074
WRENCH RABBIT
$1,211.95When your Suzuki RMZ250 shows signs of wear—loss of compression, increased blow-by, or sluggish throttle response—a complete engine rebuild is your path back to reliable performance. This Wrench...09031009- SKU:
- 09031009
- Availability:
- Ships Same Business Day
- Weight:
- 12.45 LBS
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
$1,211.95 -
Wrench Rabbit Complete Engine Rebuild Kit for 1994-1996 Kawasaki KX250 WR101-117
WRENCH RABBIT
$867.95A complete engine rebuild demands precision components and a single, reliable source—this kit eliminates guesswork by bundling everything you need to restore your KX250 to factory specifications...09031091- SKU:
- 09031091
- Availability:
- Ships Same Business Day
- Weight:
- 14.25 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$867.95Qty in Cart: 0Quantity:Price:$867.95Subtotal:
