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 23404A
VERTEX
$315.95Factory pistons wear down under sustained high RPM and boost conditions, compromising ring seal and cylinder pressure—exactly when you can't afford failure. The VERTEX Piston Kit 23404A delivers the...09101963- SKU:
- 09101963
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE - OVERSIZE:
- +3,00 MM
- DISPLACEMENT:
- 480 CC
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- CYLINDER DIAMETER METRIC:
- 98.00 MM
- PISTON DIAMETER METRIC:
- 97.96 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- STYLE:
- FORGED BIG BORE
- BORE - OVERSIZE METRIC:
- +3.00 MM
$315.95Qty in Cart: 0Quantity:Price:$315.95Subtotal: -
VERTEX Piston Kit 22567A
VERTEX
$262.95A quality piston kit is the foundation of engine reliability and performance—especially under high RPM and boost conditions. The VERTEX Piston Kit 22567A delivers the precision engineering and...09101902- SKU:
- 09101902
- Availability:
- Ships Same Business Day
- Weight:
- 0.93 LBS
$262.95 -
VERTEX Piston Kit - Standard 22926B
VERTEX
$230.95Precision-engineered pistons are the foundation of reliable high-RPM performance, and the VERTEX Standard 22926B delivers the durability you need for consistent power delivery across extended racing...09100993- SKU:
- 09100993
- Availability:
- Ships Same Business Day
- Weight:
- 0.62 LBS
- CYLINDER DIAMETER METRIC:
- 64.00 MM
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 200 CC
- PISTON DIAMETER METRIC:
- 63.95 MM
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
$230.95Qty in Cart: 0Quantity:Price:$230.95Subtotal: -
VERTEX Piston Kit 24188C
VERTEX
$148.45Whether you're rebuilding a tired engine or pushing your racer to the next level, piston quality directly determines your engine's reliability and performance envelope. The VERTEX Piston Kit 24188C...09104664- SKU:
- 09104664
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- DISPLACEMENT:
- 450 CC
- PISTON DIAMETER METRIC:
- 95.98 MM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- 14.4:1
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
$148.45Qty in Cart: 0Quantity:Price:$148.45Subtotal: -
VERTEX Piston Kit 24268A
VERTEX
$236.95The VERTEX Piston Kit 24268A delivers the reliability and performance precision you need for consistent top-end durability, whether you're rebuilding after wear or upgrading for increased...09105178- SKU:
- 09105178
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- ENGINE TYPE:
- 4-STROKE
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- 14.3:1
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- PISTON DIAMETER METRIC:
- 76.95 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 250 CC
$236.95Qty in Cart: 0Quantity:Price:$236.95Subtotal: -
VERTEX Piston Kit 24270A
VERTEX
$254.95The VERTEX Piston Kit 24270A delivers the durability and precision you need to maximize engine performance and reliability, whether you're rebuilding a stock engine or pushing the limits on the track...09105191- SKU:
- 09105191
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
$254.95Qty in Cart: 0Quantity:Price:$254.95Subtotal: -
VERTEX Piston Kit - High Compression VTKTC23113A
VERTEX
$307.95Precision piston design directly impacts engine reliability, combustion efficiency, and peak horsepower delivery—especially in high-compression build scenarios where margin for error is zero. The...09103736- SKU:
- 09103736
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
$307.95Qty in Cart: 0Quantity:Price:$307.95Subtotal: -
VERTEX Piston Kit VTKTC23235A
VERTEX
$325.95High-performance pistons are the foundation of reliable engine output, especially under sustained boost and high RPM conditions. The VERTEX Piston Kit VTKTC23235A delivers precision-engineered...09103742- SKU:
- 09103742
- Availability:
- Ships Same Business Day
- Weight:
- 2.05 LBS
$325.95Qty in Cart: 0Quantity:Price:$325.95Subtotal: -
VERTEX Piston Kit 23737C
VERTEX
$151.53A piston kit is the heartbeat of your engine's power delivery—and the VERTEX 23737C is engineered for builders who refuse to compromise on durability or performance. This kit combines precision...09102619- SKU:
- 09102619
- Availability:
- Ships Same Business Day
- Weight:
- 0.96 LBS
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- 13.8:1
- PISTON DIAMETER METRIC:
- 95.97 MM
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 450 CC
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
$151.53Qty in Cart: 0Quantity:Price:$151.53Subtotal: -
On Sale
Wiseco Wrist Pin 2000-2005 Yamaha YZ250 S376
WISECO
MSRP: $22.99Now: $20.00Was: $22.99The Wiseco S376 wrist pin is engineered to handle the extreme demands of 2-stroke racing, delivering the precision fit and durability your YZ250 engine requires to perform at its peak. Whether you're...S376- SKU:
- S376
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- LENGTH:
- 57 MM
- OUTSIDE DIAMETER:
- 19,00 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- APPLICATION:
- PISTON
- LENGTH METRIC:
- 57 MM
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER METRIC:
- 19.00 MM
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- WRIST PIN
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
MSRP: $22.99Now: $20.00Was: $22.99Qty in Cart: 0Quantity:Price:MSRP: $22.99Now: $20.00Was: $22.99Subtotal: -
On Sale
Wiseco Wrist Pin Honda CB350F 1972-1973 S522
WISECO
MSRP: $25.95Now: $20.00Was: $25.95The Wiseco S522 wrist pin is engineered for Honda CB350F engines that demand reliable performance under sustained high RPM operation. Whether you're rebuilding a vintage racer or restoring your...S522- SKU:
- S522
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- LENGTH METRIC:
- 57.8 MM
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- ATV
- APPLICATION:
- PISTON
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER:
- 15,00 MM
- RIDING STYLE:
- OFF-ROAD
- LENGTH:
- 57,8 MM
- OUTSIDE DIAMETER METRIC:
- 15.00 MM
- PRODUCT NAME:
- WRIST PIN
- UNITS:
- EACH
MSRP: $25.95Now: $20.00Was: $25.95 -
On Sale
Wiseco 2-Stroke Piston Kit 58mm Standard Bore for 2016-2017 KTM 150 SX RE909M05800
WISECO
MSRP: $221.95Now: $174.00Was: $221.95The Wiseco 2-Stroke Piston Kit is engineered to maximize performance and reliability in your 2016-2017 KTM 150 SX, delivering the precision fitment and durability that competitive and recreational...09105103- SKU:
- 09105103
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- BORE SIZE METRIC:
- 58.00 MM
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- UNITS:
- KIT
- PISTON MATERIAL:
- FORGED
MSRP: $221.95Now: $174.00Was: $221.95 -
On Sale
Wiseco Piston Kit with Gaskets for Kawasaki KX100 1998-2013 PK1154
WISECO
MSRP: $192.95Now: $149.00Was: $192.95Wiseco's forged piston kits deliver the durability and precision needed for competitive KX100 racing and high-performance riding. If you're serious about engine reliability at peak RPMs, this...09030310- SKU:
- 09030310
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE SIZE METRIC:
- 52.50 MM
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 99 CC
- ENGINE TYPE:
- 2-STROKE
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- PISTON DIAMETER METRIC:
- 52.45 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 45.80 MM
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
MSRP: $192.95Now: $149.00Was: $192.95Qty in Cart: 0Quantity:Price:MSRP: $192.95Now: $149.00Was: $192.95Subtotal: -
Wiseco Piston Kit with Gasket for Yamaha YZ250F 2012-2013 PK1902
WISECO
$309.95A piston kit is the foundation of reliable top-end performance, and the Wiseco PK1902 delivers the durability required for sustained high-RPM operation on your YZ250F. This complete kit eliminates...09031146- SKU:
- 09031146
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- DISPLACEMENT:
- 250 CC
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 76.95 MM
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 77.00 MM
- MODEL:
- FORGED SERIES
- STROKE LENGTH METRIC:
- 53.60 MM
$309.95Qty in Cart: 0Quantity:Price:$309.95Subtotal: -
Wiseco Top End Bearing Kawasaki KDX200 1986-2006 B1008
WISECO
$25.95Top-end bearing wear accelerates engine deterioration and reduces reliability on the track or trail. The Wiseco B1008 delivers precision-engineered durability built specifically for KDX200 engines,...B1008- SKU:
- B1008
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- TYPE:
- TOP END
- APPLICATION:
- PISTON
- MATERIAL:
- SILICONE
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- BEARING
- UNITS:
- EACH
- INSIDE DIAMETER METRIC:
- 18 MM
- LENGTH METRIC:
- 22 MM
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER METRIC:
- 22 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
$25.95 -
Wiseco 77mm Piston Ring Set for Honda XR250R 1986-2004 3032XC
WISECO
$49.95Whether you're rebuilding a carbureted trail bike or extracting peak horsepower from a vintage Honda XR250R, fresh piston rings are critical to maintaining compression, controlling blow-by, and...09120118- SKU:
- 09120118
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE SIZE METRIC:
- 77.00 MM
- DISPLACEMENT:
- 250 CC
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
$49.95Qty in Cart: 0Quantity:Price:$49.95Subtotal: -
Wiseco Crankshaft Kit for 2005-2007 Suzuki RM-Z450 WPC142
WISECO
$594.95A crankshaft is the backbone of your engine's reliability and performance—especially when pushing an RM-Z450 to its limits. Wiseco's factory-assembled kit delivers precision-engineered components...09210139- SKU:
- 09210139
- Availability:
- Ships Same Business Day
- Weight:
- 13.54 LBS
- FEATURES:
- INCLUDES BEARING AND GASKET
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 62.80 MM
- TYPE:
- BOTTOM END
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- UNITS:
- KIT
$594.95Qty in Cart: 0Quantity:Price:$594.95Subtotal: -
Wiseco Crankshaft KTM 65 SX 2003-2008 WPC161A
WISECO
$329.95If you're rebuilding a KTM 65 SX or pushing your engine to its limits, the Wiseco WPC161A crankshaft kit delivers the precision and durability needed for reliable high-RPM operation. This complete...09210547- SKU:
- 09210547
- Availability:
- Ships Same Business Day
- Weight:
- 6.10 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT KIT
- STROKE LENGTH METRIC:
- 40.00 MM
$329.95Qty in Cart: 0Quantity:Price:$329.95Subtotal: -
Wiseco Engine Rebuild Kit for 1997-2001 Honda CR250R PWR101-101
WISECO
$710.95A complete engine rebuild demands precision components that restore your CR250 to factory performance specs—and the Wiseco PWR101-101 delivers exactly that. This comprehensive kit pairs a...09031491- SKU:
- 09031491
- Availability:
- Ships Same Business Day
- Weight:
- 13.80 LBS
- BORE SIZE METRIC:
- 66.40 MM
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$710.95Qty in Cart: 0Quantity:Price:$710.95Subtotal: -
Wiseco Engine Rebuild Kit KTM 65 SX 2003-2008 PWR161A-100
WISECO
$479.95When your KTM 65 SX engine hits high hours or shows signs of wear, a complete rebuild with OEM-quality components is the most cost-effective path to restoring reliability and performance. The Wiseco...09031538- SKU:
- 09031538
- Availability:
- Ships Same Business Day
- Weight:
- 1.80 LBS
- BORE SIZE METRIC:
- 45.00 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- DISPLACEMENT:
- 65 CC
- FEATURES:
- PROLITE® PISTON
- MODEL:
- GARAGE BUDDY
- OVERBORE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
$479.95Qty in Cart: 0Quantity:Price:$479.95Subtotal:
