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
-
Wiseco Piston Kit 54.5mm 11:1 Compression Yamaha TTR125 2000-2021 PK1683
WISECO
$197.95If you're rebuilding your TTR125's top end, a quality piston kit is non-negotiable—it's the foundation of engine reliability and power output. The Wiseco PK1683 delivers forged-piston durability with a complete gasket and ring set, eliminating the...09030740- SKU:
- 09030740
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE SIZE METRIC:
- 54.50 MM
- DISPLACEMENT:
- 123.7 CC
- PISTON DIAMETER METRIC:
- 54.45 MM
- TYPE:
- TOP END
- BORE - OVERSIZE METRIC:
- +0.50 MM
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE:
- +0,50 MM
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.00 MM
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- REBUILD KIT
$197.95 -
Wiseco Piston Kit Honda CRF250R 2004-2007 4829M07800
WISECO
$210.95The stock piston in your CRF250R is a compromise between cost and performance—it's time to upgrade. A quality aftermarket piston like this Wiseco kit will sharpen throttle response, reduce combustion losses, and deliver measurable gains in power output...09100333- SKU:
- 09100333
- Availability:
- Ships Same Business Day
- Weight:
- 0.53 LBS
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.9:1
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- ARMORGLIDE®
- STROKE LENGTH METRIC:
- 52.20 MM
- DISPLACEMENT:
- 249 CC
- BORE SIZE METRIC:
- 78.00 MM
- PISTON MATERIAL:
- FORGED
$210.95 -
Wiseco Piston Kit Standard Bore 100mm 8.7:1 Compression Honda XR650L 1993-2020 4562M10000
WISECO
$248.95If you're running an XR650L that's seen serious miles or you're prepping for aggressive trail and off-road duty, a quality piston kit is essential to maintain compression, seal integrity, and reliability. Wiseco pistons are purpose-built for Honda's...09100337- SKU:
- 09100337
- Availability:
- Ships Same Business Day
- Weight:
- 1.38 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON
- BORE SIZE METRIC:
- 100.00 MM
- DISPLACEMENT:
- 650 CC
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- COMPRESSION RATIO IMPERIAL:
- 8.7:1
- STROKE LENGTH METRIC:
- 82.00 MM
$248.95 -
Wiseco Piston Kit Kawasaki KX85 2001-2008 782M04950
WISECO
$143.95A worn or stock piston can limit your KX85's potential—costing you throttle response, reliability, and track performance. Wiseco's precision-engineered piston kit restores the efficiency your engine demands, with lightweight construction and superior...09101238- SKU:
- 09101238
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE - OVERSIZE:
- +1,00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- STROKE LENGTH METRIC:
- 45.80 MM
- BORE SIZE METRIC:
- 49.50 MM
- DISPLACEMENT:
- 84,9 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$143.95 -
Wiseco Piston Kit 54.5mm 11:1 Compression for Yamaha TT-R125 2000-2009 4752M05450
WISECO
$160.95When you're pushing your TT-R125 to its limits on the trail or track, a stock piston won't cut it. The Wiseco 4752M05450 delivers the compression ratio and material science you need to unlock real power gains while maintaining the reliability that keeps...4752M05450- SKU:
- 4752M05450
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- STROKE LENGTH METRIC:
- 54.00 MM
- DISPLACEMENT:
- 123.7 CC
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,50 MM
- BORE SIZE METRIC:
- 54.50 MM
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 54.45 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
$160.95 -
Wiseco YZ490 IT490 1982-1984 Piston Kit 478M08700
WISECO
$234.95When you're pushing a YZ490 or IT490 to its limits—whether on the trail or at the track—piston integrity becomes non-negotiable. The Wiseco 478M08700 piston kit delivers the durability and precision your engine demands, featuring a high-silicon alloy...478M08700- SKU:
- 478M08700
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- BORE SIZE METRIC:
- 87.00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 487 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 86.92 MM
- STROKE LENGTH METRIC:
- 82.00 MM
$234.95 -
Wiseco Piston Kit 98mm 9:1 Compression Honda XR600R 1985-2000 4577M09800
WISECO
$239.95When you're pushing your XR600R to its limits, factory pistons become a liability. The Wiseco 4577M09800 delivers the strength and precision your engine demands, whether you're conquering technical trail sections or competing on the track. This complete...4577M09800- SKU:
- 4577M09800
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- BORE - OVERSIZE:
- +1,00 MM
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON DIAMETER METRIC:
- 97.92 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 591 CC
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- STROKE LENGTH METRIC:
- 80.00 MM
- BORE SIZE METRIC:
- 98.00 MM
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
$239.95 -
Wiseco Piston Kit Yamaha YZ80 1976-1980 457M05000
WISECO
$135.95A worn or damaged piston directly impacts engine compression, throttle response, and overall power delivery on your YZ80. The Wiseco 457M05000 restores factory performance specifications while offering the durability upgrades your bike needs for...457M05000- SKU:
- 457M05000
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 42.00 MM
- BORE SIZE METRIC:
- 50.00 MM
- DISPLACEMENT:
- 79 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- +1,00 MM
- PRODUCT NAME:
- PISTON KIT
- PISTON DIAMETER METRIC:
- 49.95 MM
$135.95 -
Wiseco Piston Kit 1995-2021 Kawasaki KX100 RE907M05300
WISECO
$132.64When you're pushing your KX100 to the limit, your piston has to absorb extreme combustion pressures and temperatures without compromise. The Wiseco Racer Elite Piston Kit delivers the durability and precision tolerances that separate consistent lap times...09105093- SKU:
- 09105093
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- SKIRT COATING:
- ARMORFIT™
- BORE - OVERSIZE:
- +0,50 MM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 53.00 MM
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- PISTON MATERIAL:
- FORGED
$132.64 -
Wossner Connecting Rod for Kawasaki KX60 1983-2003 P2001
WOSSNER
$112.00The Wössner Connecting Rod for the KX60 is engineered for riders who demand reliability through complete engine rebuilds. When you're rebuilding a crankshaft, the connecting rod is the critical link between piston and crank—material quality and precision...09230388- SKU:
- 09230388
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
$112.00 -
Wossner Connecting Rod KTM 300 EXC 1990-2003 P2024
WOSSNER
$122.00If you're rebuilding a KTM 300 EXC engine, the connecting rod is where precision engineering directly translates to reliability under extreme conditions. The Wössner P2024 is engineered from 8620 forged alloy and shot peened for the durability demanded...09230392- SKU:
- 09230392
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
$122.00 -
Wossner Piston Kit Yamaha YZ250 1999-2025 66.35mm 8216DA
WOSSNER
$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 of production, this complete kit eliminates the...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
$152.00 -
Wossner Piston Kit Yamaha YZ250 1999-2026 66.36mm 8216DB
WOSSNER
$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 4032 T6 forged aluminum and permanent skirt coating...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
$152.00 -
Wossner Piston Kit 53.95mm 2014-2025 Husqvarna TC125 8220DA
WOSSNER
$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 handles the thermal stress and repetitive load cycles...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
$122.00 -
Wossner Piston Kit 45.03mm for KTM 65 SX 2009-2025 Husqvarna TC65 2017-2025 GasGas MC65 2021-2025 8241DB
WOSSNER
$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 German-engineered kit extends engine life while maintaining the...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
$102.00 -
Wossner Piston Kit Yamaha YZ250 1988-1991 8134D150
WOSSNER
$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 material science that separates a dependable motor from one...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
$182.00 -
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 package—eliminating guesswork and ensuring your engine runs...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
$683.95 -
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 every critical component you need in one package,...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
$1,092.95 -
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 Rabbit kit eliminates the guesswork by bundling every...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. Whether you're addressing worn pistons, damaged bearings,...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
$867.95
