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 Top End Bearing for Suzuki LT250R QuadRacer 1985-1992 B1002
WISECO
$25.95The Wiseco B1002 top end bearing is purpose-built for the demanding conditions of QuadRacer competition and high-rpm trail riding. A worn or failing bearing kills engine efficiency, increases friction, and risks catastrophic seizure—this Wiseco unit...B1002- SKU:
- B1002
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- PISTON
- INSIDE DIAMETER METRIC:
- 18 MM
- MATERIAL:
- ALUMINUM
- MATERIAL:
- SILICONE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- OUTSIDE DIAMETER METRIC:
- 23 MM
- LENGTH METRIC:
- 23.8 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- ATV
- TYPE:
- TOP END
- UNITS:
- EACH
$25.95 -
Wiseco Top End Bearing Yamaha YFZ350 Banshee 1987-2006 B1005
WISECO
$25.95The Wiseco B1005 top end bearing is essential for maintaining precise piston-to-cylinder clearances and supporting sustained high-RPM operation in your YFZ350 Banshee. A worn or inadequate bearing accelerates top-end wear and compromises engine...B1005- SKU:
- B1005
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- LENGTH METRIC:
- 22.5 MM
- PRODUCT NAME:
- BEARING
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER METRIC:
- 21 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- UNITS:
- EACH
- APPLICATION:
- PISTON
- INSIDE DIAMETER METRIC:
- 16 MM
- MATERIAL:
- SILICONE
$25.95 -
Wiseco Top End Bearing Kawasaki KX85 2001-2024 B1006
WISECO
$25.95The Wiseco Top End Bearing B1006 is engineered to handle the extreme demands of high-revving two-stroke engines found in competitive KX85 platforms. A worn or substandard bearing will compromise piston speed consistency, increase friction losses, and...B1006- SKU:
- B1006
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- LENGTH METRIC:
- 17.5 MM
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER METRIC:
- 18 MM
- TYPE:
- TOP END
- UNITS:
- EACH
- INSIDE DIAMETER METRIC:
- 14 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- PISTON
- MATERIAL:
- SILICONE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$25.95 -
Wiseco Top End Bearing 15x19x20 KTM 125 SX 1998-2021 B1013
WISECO
$25.95The Wiseco B1013 top end bearing is engineered to handle the demands of high-RPM two-stroke performance, delivering reliability when your KTM 125 SX is pushed to its limits. Precision-manufactured with a case-hardened, high-silicon aluminum construction,...B1013- SKU:
- B1013
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- LENGTH METRIC:
- 19.8 MM
- APPLICATION:
- PISTON
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER METRIC:
- 19 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- INSIDE DIAMETER METRIC:
- 15 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- EACH
- MATERIAL:
- ALUMINUM
$25.95 -
Wiseco Top End Bearing Arctic Cat Cheetah 500 F/C 1986-1988 B1014
WISECO
$25.95The Wiseco B1014 top end bearing is engineered to handle sustained high-RPM operation without compromising reliability—critical for both competitive racing and demanding recreational riding on your Arctic Cat Cheetah 500. A precision-manufactured,...B1014- SKU:
- B1014
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- APPLICATION:
- PISTON
- INSIDE DIAMETER METRIC:
- 18 MM
- MATERIAL:
- SILICONE
- LENGTH METRIC:
- 22 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- EACH
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER METRIC:
- 23 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
$25.95 -
Wiseco Cam Chain Kawasaki KX450F 2006-2008 KLX450R 2008-2021 CC019
WISECO
$108.95Your KX450F or KLX450R's cam chain is the backbone of reliable valve timing—and a worn or failing unit can quickly cascade into catastrophic engine damage. The Wiseco CC019 replaces factory chains with precision-engineered strength, reducing friction and...09250319- SKU:
- 09250319
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- NUMBER OF LINKS:
- 124
- RIDING STYLE:
- STREET
- CHAIN SIZE:
- 98XRH2010
- PRODUCT NAME:
- CHAIN
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CAM
- UNITS:
- EACH
$108.95 -
Wiseco Wrist Pin 19mm OD 47.5mm L Honda CRF450R 2009-2016 S682
WISECO
$25.95The Wiseco S682 wrist pin is engineered to handle the extreme loads and thermal stress of high-RPM racing engines. If you're building or rebuilding a CRF450R, this precision-machined component ensures reliable piston-to-rod articulation under sustained...09130012- SKU:
- 09130012
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- OUTSIDE DIAMETER METRIC:
- 19.00 MM
- PRODUCT NAME:
- WRIST PIN
- APPLICATION:
- PISTON
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER:
- 19,00 MM
- RIDING STYLE:
- OFF-ROAD
- LENGTH:
- 62,1 MM
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- LENGTH METRIC:
- 62.1 MM
- UNITS:
- EACH
$25.95 -
Wiseco Wrist Pin for 2009 KTM 50 SX Mini S563
WISECO
$23.95The Wiseco S563 wrist pin is a precision-engineered connecting component built to handle the demands of high-RPM 2-stroke racing. If you're running a 2009 KTM 50 SX Mini at the edge of its limits, this pin delivers the strength and thermal stability...09130014- SKU:
- 09130014
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- LENGTH METRIC:
- 37.80 MM
- PRODUCT NAME:
- WRIST PIN
- APPLICATION:
- PISTON
- LENGTH:
- 37,80 MM
- MATERIAL:
- SILICONE
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER:
- 12,00 MM
- OUTSIDE DIAMETER METRIC:
- 12.00 MM
- RIDING STYLE:
- STREET
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$23.95 -
Wiseco Crankshaft Kit Yamaha YZ125 2005-2021 WPC163
WISECO
$421.95A worn or damaged crankshaft compromises the entire bottom end of your YZ125, directly affecting power delivery, reliability, and longevity. The Wiseco WPC163 kit eliminates guesswork by combining a factory-assembled crankshaft, precision bearings, and...09210549- SKU:
- 09210549
- Availability:
- Ships Same Business Day
- Weight:
- 7.95 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT KIT
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
$421.95Qty in Cart: 0Quantity:Price:$421.95Subtotal: -
Wiseco Crankshaft Kit Kawasaki KX85 2006-2013 WPC164
WISECO
$332.95A worn or damaged crankshaft directly compromises engine reliability, power delivery, and longevity—especially critical in high-RPM racing applications. The Wiseco WPC164 delivers a factory-assembled, precision-engineered solution that restores your KX85...09210550- SKU:
- 09210550
- Availability:
- Ships Same Business Day
- Weight:
- 6.25 LBS
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 45.80 MM
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT KIT
$332.95 -
Wiseco Crankshaft Kit 2003-2004 Suzuki RM250 WPC165A
WISECO
$532.95A worn or damaged crankshaft compromises engine reliability and peak performance—especially in high-RPM racing applications where precision tolerances are non-negotiable. The Wiseco WPC165A delivers a complete bottom-end solution with factory-assembled...09210551- SKU:
- 09210551
- Availability:
- Ships Same Business Day
- Weight:
- 12.80 LBS
- STROKE LENGTH METRIC:
- 72.00 MM
- PRODUCT NAME:
- CRANKSHAFT KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$532.95 -
Wiseco Suzuki RM85 2002-2020 Crankshaft WPC166
WISECO
$410.95If you're rebuilding a Suzuki RM85 engine, the Wiseco WPC166 crankshaft eliminates guesswork with a factory-assembled, precision-trued unit that meets OEM specifications right out of the box. This complete kit delivers everything needed for a reliable...09210553- SKU:
- 09210553
- Availability:
- Ships Same Business Day
- Weight:
- 6.55 LBS
- PRODUCT NAME:
- CRANKSHAFT KIT
- STROKE LENGTH METRIC:
- 46.80 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$410.95Qty in Cart: 0Quantity:Price:$410.95Subtotal: -
Wiseco Engine Rebuild Kit 2002-2023 Suzuki RM85 PWR166-100
WISECO
$499.95When your Suzuki RM85's engine reaches the end of its service life, a quality rebuild kit isn't optional—it's the foundation of reliable performance. The Wiseco PWR166-100 delivers OEM-equivalent components and premium upgrades in one complete package,...09031618- SKU:
- 09031618
- Availability:
- Ships Same Business Day
- Weight:
- 8.20 LBS
- BORE - OVERSIZE:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 48.00 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$499.95Qty in Cart: 0Quantity:Price:$499.95Subtotal: -
Wiseco Engine Rebuild Kit 52.00mm Bore for 2006-2011 KTM 105 SX PWR176-100
WISECO
$588.95When your KTM 105 SX's engine shows signs of wear, a complete rebuild using OEM-quality components is the only way to restore full performance and reliability. The Wiseco PWR176-100 kit delivers all the precision-engineered parts you need—piston,...09031622- SKU:
- 09031622
- Availability:
- Ships Same Business Day
- Weight:
- 8.05 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 52.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$588.95Qty in Cart: 0Quantity:Price:$588.95Subtotal: -
Wiseco Engine Rebuild Kit for Honda CR125R 2005-2007 54mm Bore PWR177-100
WISECO
$588.95When your Honda CR125R 2005-2007 shows signs of wear—loss of compression, decreased power delivery, or visible piston scoring—a complete engine rebuild is the most cost-effective path to restoring full performance. The Wiseco PWR177-100 kit delivers...09031623- SKU:
- 09031623
- Availability:
- Ships Same Business Day
- Weight:
- 9.95 LBS
- BORE SIZE METRIC:
- 54.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- TYPE:
- ENGINE
- PRODUCT NAME:
- REBUILD KIT
$588.95 -
Wiseco Engine Rebuild Kit for 2013-2017 KTM 85 SX 17/14 PWR178-100
WISECO
$721.95When your KTM 85 SX's engine shows signs of wear—loss of compression, increased blow-by, or declining throttle response—a quality rebuild kit is the most cost-effective path to restoring OEM performance and reliability. The Wiseco PWR178-100 delivers all...09031624- SKU:
- 09031624
- Availability:
- Ships Same Business Day
- Weight:
- 7.90 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 47.00 MM
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
$721.95Qty in Cart: 0Quantity:Price:$721.95Subtotal: -
Wiseco Engine Rebuild Kit for Honda CR250R 2002-2004 PWR132-100
WISECO
$710.95A two-stroke engine rebuild is a critical maintenance milestone that directly impacts power delivery, reliability, and race-day performance. The Wiseco PWR132-100 kit eliminates the guesswork by providing OEM-spec components engineered to tight...09031517- SKU:
- 09031517
- Availability:
- Ships Same Business Day
- Weight:
- 12.85 LBS
- DISPLACEMENT:
- 250 CC
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 66.40 MM
$710.95 -
Wiseco Engine Rebuild Kit for Yamaha YZ125 2005-2020 PWR163-100
WISECO
$588.95A complete engine rebuild kit eliminates the guesswork of sourcing individual components—you get everything needed for a full top and bottom-end overhaul in one package. Whether you're restoring a worn-out motor or preparing for the season ahead,...09031541- SKU:
- 09031541
- Availability:
- Ships Same Business Day
- Weight:
- 2.45 LBS
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$588.95Qty in Cart: 0Quantity:Price:$588.95Subtotal: -
Wiseco Engine Kit Kawasaki KX100 2006 PWR164-100
WISECO
$555.95A top and bottom-end rebuild is the most cost-effective way to restore your KX100 to factory performance specifications. The Wiseco Engine Kit eliminates the guesswork of sourcing individual components by bundling everything you need for a complete...09031542- SKU:
- 09031542
- Availability:
- Ships Same Business Day
- Weight:
- 7.55 LBS
- PRODUCT NAME:
- REBUILD KIT
- BORE SIZE METRIC:
- 52.50 MM
- DISPLACEMENT:
- 100 CC
- ENGINE TYPE:
- 2-STROKE
- TYPE:
- ENGINE
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$555.95 -
Wiseco Engine Rebuild Kit for 2010-2013 Honda CRF250R PWR168-100
WISECO
$877.95When your CRF250's engine reaches the end of its service life, a complete rebuild restores original performance and reliability without the cost of a full replacement. The Wiseco Engine Rebuild Kit supplies every critical component needed for a thorough...09031546- SKU:
- 09031546
- Availability:
- Ships Same Business Day
- Weight:
- 2.30 LBS
$877.95
