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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VERTEX Piston Kit 22356A
VERTEX
$208.95If you're building a high-revving engine or refreshing a worn bottom end, piston quality directly impacts reliability, longevity, and peak performance. The VERTEX Piston Kit 22356A delivers the...09102541- SKU:
- 09102541
- Availability:
- Ships Same Business Day
- Weight:
- 0.73 LBS
- CYLINDER DIAMETER METRIC:
- 68.00 MM
- DISPLACEMENT:
- 250 CC
- PRODUCT NAME:
- PISTON KIT
- PISTON DIAMETER METRIC:
- 67.94 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- STYLE:
- CAST REPLICA
$208.95 -
VERTEX Piston Kit 22584A
VERTEX
$183.95Your engine's performance and longevity depend on pistons engineered for both strength and precision. The VERTEX Piston Kit 22584A delivers forged durability with optimized geometry to maximize power...09102542- SKU:
- 09102542
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- DISPLACEMENT:
- 250 CC
- PISTON DIAMETER METRIC:
- 66.34 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
$183.95 -
VERTEX Piston Kit 22600B
VERTEX
$177.95A quality piston kit is the foundation of a reliable, high-performance top end. The VERTEX Piston Kit 22600B delivers the durability and precision needed for sustained power, whether you're...09102543- SKU:
- 09102543
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 53.95 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- STYLE:
- CAST REPLICA
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$177.95 -
VERTEX Piston Kit 22601B
VERTEX
$218.95A quality piston kit is the foundation of engine reliability and performance—especially if you're pushing RPMs or rebuilding after wear. The VERTEX Piston Kit 22601B delivers the durability and...09102544- SKU:
- 09102544
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON DIAMETER METRIC:
- 66.95 MM
- STYLE:
- CAST REPLICA
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$218.95Qty in Cart: 0Quantity:Price:$218.95Subtotal: -
VERTEX Piston Kit 22926C
VERTEX
$223.95The VERTEX Piston Kit 22926C is engineered for builders who demand reliability under extreme combustion pressures. Purpose-built with advanced heat treatment and low-friction coatings, these pistons...09102547- SKU:
- 09102547
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- ENGINE TYPE:
- 2-STROKE
- STYLE:
- CAST REPLICA
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 64.00 MM
- DISPLACEMENT:
- 200 CC
- PISTON DIAMETER METRIC:
- 63.96 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
$223.95 -
VERTEX Piston Kit 23235B
VERTEX
$302.95The VERTEX Piston Kit 23235B delivers the precision and durability demanded by serious racers and high-performance engines. Purpose-built with advanced heat-treatment and low-friction coatings, these...09102549- SKU:
- 09102549
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
$302.95Qty in Cart: 0Quantity:Price:$302.95Subtotal: -
Wiseco Wrist Pin 12mm x 18mm x 58.20mm for Suzuki LT250R QuadRacer 1988-1992 S484
WISECO
$22.99The wrist pin is a critical load-bearing component that directly transfers combustion forces from the piston to the connecting rod—choosing the right one is essential for reliability under sustained...S484- SKU:
- S484
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- APPLICATION:
- PISTON
- PRODUCT NAME:
- WRIST PIN
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- LENGTH METRIC:
- 58.20 MM
- OUTSIDE DIAMETER METRIC:
- 18 MM
$22.99Qty in Cart: 0Quantity:Price:$22.99Subtotal: -
Wiseco Wrist Pin for 2023 Yamaha YZ250 S508
WISECO
$23.95The Wiseco S508 wrist pin is engineered for the demanding conditions of 2-stroke competition. This precision-engineered component handles the extreme reciprocating loads of your YZ250 S engine while...S508- SKU:
- S508
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- APPLICATION:
- PISTON
- LENGTH METRIC:
- 72 MM
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER:
- 18,00 MM
- PRODUCT NAME:
- WRIST PIN
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- LENGTH:
- 72 MM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER METRIC:
- 18.00 MM
$23.95 -
Wiseco Wrist Pin 20mm x 60mm Arctic Cat 1995-1996 Bearcat 550 S512
WISECO
$22.99The Wiseco S512 wrist pin is engineered for Arctic Cat Bearcat 550 engines that demand reliability in extreme conditions. As a critical connecting component between the piston and connecting rod, a...S512X- SKU:
- S512X
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- UNITS:
- EACH
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER:
- 20,00 MM
- PRODUCT NAME:
- WRIST PIN
- RIDING STYLE:
- WATERCRAFT
- APPLICATION:
- PISTON
- LENGTH METRIC:
- 60 MM
- MATERIAL:
- SILICONE
- RIDING STYLE:
- OFF-ROAD
- LENGTH:
- 60 MM
- OUTSIDE DIAMETER METRIC:
- 20.00 MM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
$22.99Qty in Cart: 0Quantity:Price:$22.99Subtotal: -
Wiseco Wrist Pin for Honda CR80R 1986-2002 S517
WISECO
$22.99The Wiseco S517 wrist pin is engineered to handle the high-RPM demands of your Honda CR80R without compromise. Precision tolerances and superior material composition ensure consistent power delivery...S517- SKU:
- S517
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- LENGTH:
- 45,80 MM
- LENGTH METRIC:
- 45.80 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- WRIST PIN
- RIDING STYLE:
- STREET
- APPLICATION:
- PISTON
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER:
- 14,00 MM
- OUTSIDE DIAMETER METRIC:
- 14.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$22.99Qty in Cart: 0Quantity:Price:$22.99Subtotal: -
Wiseco Wrist Pin for Honda TRX400EX 1999-2008 S520
WISECO
$18.99The wrist pin is a critical load-bearing component that directly impacts engine reliability and longevity under extreme operating conditions. A quality wrist pin like the Wiseco S520 reduces...S520- SKU:
- S520
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- LENGTH METRIC:
- 70 MM
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER:
- 20,00 MM
- OUTSIDE DIAMETER METRIC:
- 20.00 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- LENGTH:
- 70 MM
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- PISTON
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- WRIST PIN
- RIDING STYLE:
- STREET
$18.99Qty in Cart: 0Quantity:Price:$18.99Subtotal: -
Wiseco Piston Honda CRF450R 2002-2008 96mm 12.5:1 449cc 4780M10100
WISECO
$134.95Whether you're rebuilding a tired CRF450R or preparing for peak performance, the Wiseco 96mm piston delivers the compression ratio and material science you need to extract maximum horsepower and...450M05000- SKU:
- 450M05000
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- DISPLACEMENT:
- 79.7 CC
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 41.40 MM
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 50.00 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON DIAMETER METRIC:
- 49.95 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
$134.95Qty in Cart: 0Quantity:Price:$134.95Subtotal: -
Wiseco Piston Kit Yamaha YZ450F 2014-2017 12.5:1 97mm 40111M09700
WISECO
$239.95A worn or stock piston limits your YZ450F's potential—this Wiseco kit restores and exceeds OEM performance with a higher 12.5:1 compression ratio that unlocks measurable gains in peak horsepower and...09103910- SKU:
- 09103910
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE - OVERSIZE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 60.80 MM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 97.00 MM
- DISPLACEMENT:
- 449 CC
$239.95Qty in Cart: 0Quantity:Price:$239.95Subtotal: -
Wiseco Piston Kit 44.5mm for Kawasaki KX65 2000-2026 RE919M04450
WISECO
$171.95When you're running a KX65 hard on the track or trail, stock pistons won't cut it—they'll fatigue, wear unevenly, and rob you of power just when you need it most. The Wiseco Racer Elite Piston Kit is...09105087- SKU:
- 09105087
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- UNITS:
- KIT
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 44.50 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
$171.95Qty in Cart: 0Quantity:Price:$171.95Subtotal: -
Wiseco Piston Kit 2014-2025 Kawasaki KX85 48.5mm RE924M04850
WISECO
$171.95Your KX85's engine demands a piston built to handle the punishment of competitive riding and aggressive trail conditions. Wiseco's Racer Elite platform delivers the compression sealing and structural...09105088- SKU:
- 09105088
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE SIZE METRIC:
- 48.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
$171.95Qty in Cart: 0Quantity:Price:$171.95Subtotal: -
Wiseco Piston Kit 75.50mm 10.5:1 Compression Honda XR250R 1984-1985 4329M07550
WISECO
$216.95If you're running a Honda XR250R or XL250R and want measurable gains in power and reliability, a quality piston kit is non-negotiable. The Wiseco 10.5:1 compression kit delivers the exact...4329M07550- SKU:
- 4329M07550
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- DISPLACEMENT:
- 250 CC
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 75.50 MM
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PISTON DIAMETER METRIC:
- 75.45 MM
- STROKE LENGTH METRIC:
- 56.50 MM
$216.95 -
Wiseco Piston Kit 1995-2021 Kawasaki KX100 52.5mm RE907M05250
WISECO
$171.95A worn or damaged piston directly kills engine performance, responsiveness, and reliability—especially in a high-revving 2-stroke like the KX100. The Wiseco Racer Elite Piston Kit delivers the...09105092- SKU:
- 09105092
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE SIZE METRIC:
- 52.50 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- BORE - OVERSIZE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- PISTON MATERIAL:
- FORGED
$171.95 -
Wiseco Piston Kit 92.50mm 10.25:1 Honda XR500R 1983-1984 4330M09250
WISECO
$239.95If you're running an 1983-1984 Honda XR500R, the factory piston limits your engine's potential—especially under sustained load or aggressive throttle inputs. This Wiseco piston kit raises your...4330M09250- SKU:
- 4330M09250
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- BORE - OVERSIZE:
- +0,50 MM
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 92.50 MM
- COMPRESSION RATIO IMPERIAL:
- 10.25:1
- DISPLACEMENT:
- 498 CC
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- FORGED SERIES
- STROKE LENGTH METRIC:
- 75.00 MM
- PISTON DIAMETER METRIC:
- 92.45 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
$239.95 -
Wiseco Piston Kit with Gaskets for 2003-2004 Yamaha YZ125 PK1347
WISECO
$229.95A worn or damaged piston directly limits your YZ125's power output and reliability—this Wiseco kit delivers the precision engineering needed to restore peak performance. The high-silicon aluminum...09030250- SKU:
- 09030250
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 56.00 MM
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- PISTON SIZE METRIC:
- +2.00 MM
- PISTON DIAMETER METRIC:
- 55.95 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- MODEL:
- PRO-LITE
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
$229.95Qty in Cart: 0Quantity:Price:$229.95Subtotal: -
Wiseco Suzuki RM125 1991-1996 Piston Kit with Gaskets PK1320
WISECO
$209.95The Wiseco PK1320 piston kit is engineered to restore and exceed your RM125's original performance specifications, delivering the reliability needed for competitive racing or sustained trail use...09030256- SKU:
- 09030256
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- DISPLACEMENT:
- 123 CC
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- BORE - OVERSIZE:
- +1,00 MM
- PISTON DIAMETER METRIC:
- 54.96 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 54.00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- ENGINE TYPE:
- 2-STROKE
- SKIRT COATING:
- NON-COATED
- BORE SIZE METRIC:
- 55.00 MM
- PRODUCT NAME:
- REBUILD KIT
$209.95Qty in Cart: 0Quantity:Price:$209.95Subtotal:
