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!
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- Qty in Cart
- Quantity
- Price
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VERTEX Piston Kit VTKTC22915B
VERTEX
$354.95Whether you're building a high-revving engine or pushing existing power limits, piston quality directly impacts reliability and longevity under extreme conditions. The VERTEX Piston Kit VTKTC22915B delivers engineered durability through advanced...09103717- SKU:
- 09103717
- Availability:
- Ships Same Business Day
- Weight:
- 2.25 LBS
$354.95 -
VERTEX Piston Kit VTKTC22915B-1
VERTEX
$354.95Stock pistons struggle under high-boost or extended track sessions—they warp, wear prematurely, and compromise your engine's reliability. The VERTEX Piston Kit VTKTC22915B-1 solves this with advanced heat treatment and low-friction coatings that extend...09103718- SKU:
- 09103718
- Availability:
- Ships Same Business Day
- Weight:
- 2.45 LBS
$354.95 -
VERTEX Piston Kit VTKTC22951A
VERTEX
$327.95A piston kit is the heart of engine performance—it directly impacts compression ratio, combustion efficiency, and overall durability under extreme operating conditions. The VERTEX Piston Kit VTKTC22951A delivers precision-engineered pistons built to...09103721- SKU:
- 09103721
- Availability:
- Ships Same Business Day
- Weight:
- 2.55 LBS
$327.95 -
VERTEX Piston Kit VTKTC22983A
VERTEX
$302.95A quality piston kit is the foundation of reliable high-RPM performance, and the VERTEX Piston Kit VTKTC22983A delivers the durability and precision demanded by serious builders. The T-5 heat treatment cycle ensures superior hardness and resistance to...09103724- SKU:
- 09103724
- Availability:
- Ships Same Business Day
- Weight:
- 2.05 LBS
$302.95 -
Wiseco Wrist Pin 1985-1986 Honda ATC350X S529
WISECO
$23.99The Wiseco S529 wrist pin is engineered to handle the extreme demands of high-RPM operation in your 1985-1986 Honda ATC350X. This precision-machined component maintains structural integrity under sustained load and elevated combustion temperatures,...S529- SKU:
- S529
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- APPLICATION:
- PISTON
- LENGTH:
- 61,3 MM
- LENGTH METRIC:
- 61.3 MM
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- WRIST PIN
- OUTSIDE DIAMETER:
- 21,00 MM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER METRIC:
- 21.00 MM
- RIDING STYLE:
- OFF-ROAD
$23.99 -
Wiseco Piston Kit Yamaha XT350 1985-2000 86mm 9:1 Compression 4674M08600
WISECO
$199.95If you're running a Yamaha XT350 or TT350, a worn or damaged piston directly impacts combustion efficiency, throttle response, and overall reliability. The Wiseco 4674M08600 replaces your factory piston with a precision-engineered component that restores...09102916- SKU:
- 09102916
- Availability:
- Ships Same Business Day
- Weight:
- 0.97 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 346 CC
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 59.60 MM
- BORE SIZE METRIC:
- 86.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
$199.95 -
Wiseco Piston Kit 88.00mm Oversize Yamaha YZ490 1984-1990 546M08800
WISECO
$243.95If you're running a YZ490 and want to unlock real gains in compression ratio and top-end power, a quality oversize piston is non-negotiable. The Wiseco +1.00mm kit gives you the forged strength to handle aggressive tuning and racing demands while...546M08800- SKU:
- 546M08800
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- DISPLACEMENT:
- 487 CC
- STROKE LENGTH:
- 82,00 MM
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 88.00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 82.00 MM
$243.95 -
Wiseco YZ250 2002-2025 Ring Set 2614CS
WISECO
$25.95The Wiseco 2614CS ring set is engineered to restore proper cylinder sealing and compression in your YZ250, directly translating to stronger power delivery and improved fuel efficiency across the RPM range. Whether you're rebuilding after a top-end...09120106- SKU:
- 09120106
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- BORE SIZE METRIC:
- 66.40 MM
- PISTON MATERIAL:
- ALUMINUM
- DISPLACEMENT:
- 249 CC
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- SET
$25.95 -
Wiseco 39mm Piston Ring Set for Honda CRF50F 2004-2013 3900XZ
WISECO
$46.95When your Honda CRF50F's piston rings wear, compression drops and power bleeds away—along with fuel efficiency and engine longevity. The Wiseco 3900XZ ring set restores proper cylinder sealing with precision-engineered rings that maintain consistent...09120107- SKU:
- 09120107
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- UNITS:
- SET
- DISPLACEMENT:
- 49,50 CC
- RIDING STYLE:
- STREET
- BORE SIZE METRIC:
- 39.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
$46.95 -
Wiseco Valve Kit 2004-2006 Kawasaki KX250F and Suzuki RM-Z250 SVKB4335
WISECO
$365.95Stock valve springs wear down under aggressive riding, causing valve float and losing power when you need it most. The Wiseco SVKB4335 replaces your worn intake and exhaust valves with premium steel units and precision-engineered springs rated for...09263075- SKU:
- 09263075
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
$365.95 -
Wiseco Steel Valve Kit for 2009-2010 Kawasaki KX250F SVKB4338
WISECO
$365.95Stock valve springs and steel valves on your 2009-2010 KX250F can't reliably handle the demands of consistent racing or high-RPM riding. This Wiseco Steel Valve Kit replaces those components with precision-engineered intake and exhaust valves paired with...09263077- SKU:
- 09263077
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$365.95 -
Wiseco Valve Kit KX250F 2011-2016 SVKB4341
WISECO
$365.95Stock valve springs lose tension over time, compromising ignition timing and throttle response on your KX250F. The Wiseco Valve Kit SVKB4341 replaces worn intake and exhaust valves with precision-matched components engineered to handle sustained RPMs and...09263078- SKU:
- 09263078
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
$365.95 -
Wiseco Steel Valve Set Kawasaki KX450F 2006-2008 SVKB4406
WISECO
$391.95Your KX450F's valve train demands precision components that can withstand the rigors of competitive riding and high-RPM operation. This Wiseco steel valve set delivers OEM-quality construction with performance-grade materials, ensuring consistent...09263079- SKU:
- 09263079
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- APPLICATION:
- EXHAUST
- UNITS:
- KIT
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
- RIDING STYLE:
- ATV
$391.95 -
Wiseco Valve Kit KX450F 2009-2018 SVKB4409
WISECO
$391.95Valve train wear is one of the fastest ways to lose compression and throttle response on your KX450F. The Wiseco Valve Kit SVKB4409 replaces worn intake and exhaust valves with precision-engineered components that restore your engine's sealing integrity...09263080- SKU:
- 09263080
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- APPLICATION:
- EXHAUST
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- INTAKE
$391.95 -
Wiseco Piston Ring Set 57mm Bore Yamaha YZ125 1976-1993 2244CS
WISECO
$25.95A worn or damaged piston ring set robs your YZ125 of compression and power while increasing blow-by and oil consumption. The Wiseco 2244CS delivers precision-engineered sealing that restores engine efficiency and extends top-end life, whether you're...2244CS- SKU:
- 2244CS
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- DISPLACEMENT:
- 124 CC
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 125 CC
- BORE SIZE METRIC:
- 57.00 MM
- UNITS:
- SET
$25.95 -
Wiseco Ring Set 78.00mm 1998-2002 KTM 380 SX 3071TD
WISECO
$57.95Piston ring sets are critical wear items that directly impact compression, blow-by control, and engine longevity. The Wiseco 3071TD delivers OEM-quality sealing with precision manufacturing that minimizes friction and heat, essential for 2-stroke...3071TD- SKU:
- 3071TD
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 78.00 MM
- RIDING STYLE:
- SNOW
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
$57.95 -
Wiseco Piston Kit Honda CR500R 1984-2001 91.00mm 871M09100
WISECO
$255.95The Wiseco Piston Kit is engineered for Honda CR500R two-stroke engines that demand reliability at extreme RPM. This 91.00mm, 2.0mm oversize piston delivers improved combustion efficiency and responsive power delivery, making it essential for riders who...09102026- SKU:
- 09102026
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 91.00 MM
- DISPLACEMENT:
- 472 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- ARMORGLIDE®
- STROKE LENGTH METRIC:
- 76.00 MM
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 491 CC
$255.95 -
Wiseco Piston Kit Kawasaki JS650 1987-1993 76.50mm Bore WK1017
WISECO
$344.95If you're rebuilding a 2-stroke JS650, you need pistons engineered to handle the extreme heat and pressure cycles that stock components simply can't sustain. Wiseco's high-silicone forged piston kit delivers the durability and precision ring fit that...WK1017- SKU:
- WK1017
- Availability:
- Ships Same Business Day
- Weight:
- 2.50 LBS
- BORE - OVERSIZE:
- +0,50 MM
- DISPLACEMENT:
- 643 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- BORE SIZE METRIC:
- 76.50 MM
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- PISTON DIAMETER METRIC:
- 76.40 MM
- RIDING STYLE:
- WATERCRAFT
$344.95 -
Wiseco Piston Kit 82.00mm 10.5:1 Suzuki DR350 1990-1999 4576M08200
WISECO
$194.95If you're running a Suzuki DR350 and want to reclaim lost compression or build a higher-output engine, a quality piston kit is non-negotiable. Wiseco pistons are engineered to tighter tolerances than OEM parts, delivering improved combustion efficiency...09102907- SKU:
- 09102907
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE - OVERSIZE METRIC:
- +3.00 MM
- STROKE LENGTH METRIC:
- 71.20 MM
- DISPLACEMENT:
- 349 CC
- BORE SIZE METRIC:
- 82.00 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- BORE - OVERSIZE:
- +3,00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
$194.95 -
Wiseco Piston Kit Yamaha MX80 1980-1982 1.0mm 222M04800
WISECO
$138.95When your Yamaha MX80 engine is pushing hard on the track or trail, stock pistons won't cut it—you need a component engineered for sustained high-RPM performance and reliability. This Wiseco piston kit delivers the strength and precision necessary to...222M04800- SKU:
- 222M04800
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE - OVERSIZE:
- +1,00 MM
- PRODUCT NAME:
- PISTON KIT
- MODEL:
- FORGED SERIES
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 42.00 MM
- BORE SIZE METRIC:
- 48.00 MM
- PISTON DIAMETER METRIC:
- 47.95 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 72 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$138.95
