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 22951A
VERTEX
$262.95A quality piston kit is the foundation of engine reliability and performance—whether you're rebuilding after wear or upgrading for more power. The VERTEX Piston Kit 22951A delivers OEM-grade...09100978- SKU:
- 09100978
- Availability:
- Ships Same Business Day
- Weight:
- 0.94 LBS
$262.95Qty in Cart: 0Quantity:Price:$262.95Subtotal: -
VERTEX Piston Kit 24275B
VERTEX
$322.95Whether you're rebuilding a two-stroke or refreshing a four-stroke top end, the VERTEX Piston Kit 24275B delivers the precision and durability required for consistent performance across your entire...09105132- SKU:
- 09105132
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- COMPRESSION RATIO IMPERIAL:
- 14.2:1
- DISPLACEMENT:
- 250 CC
- PISTON DIAMETER METRIC:
- 78.97 MM
- CYLINDER DIAMETER METRIC:
- 79 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- STYLE:
- GP RACER'S CHOICE
- ENGINE TYPE:
- 4-STROKE
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$322.95 -
VERTEX Piston Kit 24196A
VERTEX
$271.95The VERTEX Piston Kit 24196A delivers the durability and precision your engine demands, whether you're pushing peak RPMs on the track or rebuilding a worn top end. Engineered with premium materials...09105140- SKU:
- 09105140
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
$271.95Qty in Cart: 0Quantity:Price:$271.95Subtotal: -
VERTEX Piston Kit 24196B
VERTEX
$302.95The VERTEX Piston Kit 24196B delivers the durability and precision you need for high-RPM reliability, whether you're building a race engine or restoring a well-loved machine. The molybdenum disulfide...09105141- SKU:
- 09105141
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
$302.95 -
VERTEX Piston Kit VTKTC22805A
VERTEX
$315.95A quality piston kit is the foundation of reliable engine performance, and VERTEX's VTKTC22805A delivers the durability and precision that serious builders demand. The proprietary T-5 heat treatment...09103703- SKU:
- 09103703
- Availability:
- Ships Same Business Day
- Weight:
- 1.85 LBS
$315.95Qty in Cart: 0Quantity:Price:$315.95Subtotal: -
VERTEX Piston Kit VTKTC22805B
VERTEX
$315.95A high-revving engine demands pistons engineered for sustained performance under extreme conditions. The VERTEX Piston Kit VTKTC22805B delivers the durability and precision needed to handle...09103704- SKU:
- 09103704
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
$315.95Qty in Cart: 0Quantity:Price:$315.95Subtotal: -
VERTEX Piston Kit - High Compression VTKTC22900B
VERTEX
$388.95The VERTEX Piston Kit delivers the thermal stability and durability required for sustained high-RPM operation in competition and street applications. With precision engineering and advanced surface...09103709- SKU:
- 09103709
- Availability:
- Ships Same Business Day
- Weight:
- 2.45 LBS
$388.95Qty in Cart: 0Quantity:Price:$388.95Subtotal: -
VERTEX Piston Kit 23265A
VERTEX
$170.95A quality piston kit is the foundation of a reliable, high-RPM engine. The VERTEX Piston Kit 23265A delivers the durability and precision you need to sustain peak performance without compromising...09102554- SKU:
- 09102554
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
$170.95Qty in Cart: 0Quantity:Price:$170.95Subtotal: -
VERTEX Piston Kit 22481AB
VERTEX
$98.95A piston kit lives at the heart of your engine's power delivery—and choosing the right one determines whether you're getting reliable, consistent performance or leaving power on the table. The VERTEX...09102234- SKU:
- 09102234
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 65 CC
- PISTON DIAMETER METRIC:
- 44.96 MM
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 45.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
$98.95Qty in Cart: 0Quantity:Price:$98.95Subtotal: -
Wiseco Piston Kit Honda CRF450R 2017 4979M09600
WISECO
$269.95When you're pushing your CRF450R to its limits, stock internals won't keep up. The Wiseco 4979M09600 replaces worn or damaged pistons with a precision-engineered unit that restores—or exceeds—OEM...09102934- SKU:
- 09102934
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.0:1
- DISPLACEMENT:
- 449 CC
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 96.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 62.10 MM
$269.95Qty in Cart: 0Quantity:Price:$269.95Subtotal: -
Wiseco Piston Kit Kawasaki KX250F 2015-2016 77.00mm 13.8:1 Compression 40124M07700
WISECO
$224.95When your KX250F's original piston shows wear, combustion efficiency drops and power delivery suffers—costing you critical seconds on the track or trail. The Wiseco 40124M07700 restores that lost...09103915- SKU:
- 09103915
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- STROKE LENGTH METRIC:
- 53.60 MM
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.8:1
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- BORE SIZE METRIC:
- 77.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
$224.95Qty in Cart: 0Quantity:Price:$224.95Subtotal: -
Wiseco 95mm 12.5:1 Piston Kit for 2012-2016 KTM 500 EXC 40131M09500
WISECO
$284.95If you're running a KTM 500 EXC and want to extract meaningful gains in combustion efficiency and throttle response, a high-compression piston upgrade is one of the most direct paths forward. The...09103919- SKU:
- 09103919
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE SIZE METRIC:
- 95.00 MM
- STROKE LENGTH METRIC:
- 72.00 MM
- PISTON MATERIAL:
- FORGED
- DISPLACEMENT:
- 510 CC
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$284.95Qty in Cart: 0Quantity:Price:$284.95Subtotal: -
Wiseco Piston Kit 95mm 11.8:1 Compression for KTM 450 XC-W 2012–2016 40091M09500
WISECO
$254.95If you're running a KTM 450 XC-W and want measurable gains in throttle response and combustion efficiency, an 11.8:1 compression piston kit is the foundation for that upgrade. Wiseco's CNC-machined...09103927- SKU:
- 09103927
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- COMPRESSION RATIO IMPERIAL:
- 11.8:1
- DISPLACEMENT:
- 510 CC
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 63.40 MM
- BORE SIZE METRIC:
- 88.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
$254.95Qty in Cart: 0Quantity:Price:$254.95Subtotal: -
Wiseco Piston Kit KTM 250 EXC 2000-2005 66.40mm 857M06640
WISECO
$210.95Stock pistons in your 250 EXC won't cut it if you're pushing for more power and reliability. The Wiseco Pro-Lite piston kit delivers the precision engineering and durable materials needed to maximize...09103962- SKU:
- 09103962
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 66.40 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- DISPLACEMENT:
- 249 CC
- STROKE LENGTH METRIC:
- 72.00 MM
$210.95 -
Wiseco Piston Kit 54mm 9.4:1 Compression Honda CRF100F 2004-2013 PK1230
WISECO
$224.95A worn or damaged piston directly impacts your CRF100's throttle response, fuel efficiency, and overall reliability. The Wiseco PK1230 restores compression integrity and delivers the responsive power...09030180- SKU:
- 09030180
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- DISPLACEMENT:
- 99.2 CC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 54.00 MM
- COMPRESSION RATIO IMPERIAL:
- 9.4:1
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 53.97 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 45.00 MM
$224.95Qty in Cart: 0Quantity:Price:$224.95Subtotal: -
Wiseco Piston Kit with Gaskets Yamaha YZ85 2002-2022 PK1205
WISECO
$179.95The Wiseco PK1205 piston kit delivers the compression and durability your YZ85 needs to handle consistent high-RPM riding without premature wear. This complete top-end rebuild solution eliminates...09030194- SKU:
- 09030194
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- DISPLACEMENT:
- 85 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 49.45 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- PISTON SIZE METRIC:
- +2.00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- MODEL:
- PRO-LITE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 49.50 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 47.80 MM
- UNITS:
- KIT
- SKIRT COATING:
- NON-COATED
$179.95Qty in Cart: 0Quantity:Price:$179.95Subtotal: -
Wiseco Piston Kit 53.5mm Bore Honda CRF100F 2004-2008 PK1229
WISECO
$234.95If your Honda CRF100F is showing signs of wear or you're rebuilding after high-mileage riding, the Wiseco PK1229 brings you back to factory-spec performance with forged aluminum construction that...09030199- SKU:
- 09030199
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- DISPLACEMENT:
- 99.2 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- BORE SIZE METRIC:
- 53.50 MM
- COMPRESSION RATIO IMPERIAL:
- 9.4:1
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 53.47 MM
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 45.00 MM
- TYPE:
- TOP END
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
$234.95Qty in Cart: 0Quantity:Price:$234.95Subtotal: -
Wiseco Honda CR250R 1986-1989 Piston Kit with Gaskets PK1243
WISECO
$291.95A worn top end doesn't just cost you power—it compromises reliability when you need it most. The Wiseco PK1243 restores your CR250R to factory precision with CNC-machined pistons and a complete...09030273- SKU:
- 09030273
- Availability:
- Ships Same Business Day
- Weight:
- 1.55 LBS
- BORE SIZE METRIC:
- 66.40 MM
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 66.36 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 72.00 MM
- PRODUCT NAME:
- REBUILD KIT
$291.95 -
Wiseco Suzuki RM125 1991-1996 Piston Kit with Gaskets PK1318
WISECO
$212.95The Wiseco PK1318 piston kit is engineered specifically for the 1991-1996 Suzuki RM125, delivering the compression and ring seal needed for consistent top-end performance. Whether you're rebuilding...09030279- SKU:
- 09030279
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- PISTON DIAMETER METRIC:
- 53.96 MM
- PRODUCT NAME:
- REBUILD KIT
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 54.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- SKIRT COATING:
- NON-COATED
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 123 CC
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$212.95 -
Wiseco Yamaha PW50 1985-2025 Piston Kit with Gaskets PK1159
WISECO
$171.95The Wiseco PK1159 is a complete top-end rebuild solution for your Yamaha PW50, delivering the precision and durability needed for consistent performance across decades of model years. Whether you're...09030281- SKU:
- 09030281
- Availability:
- Ships Same Business Day
- Weight:
- 0.93 LBS
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 40.50 MM
- COOLING SYSTEM:
- LIQUID COOLED
- BORE - OVERSIZE METRIC:
- +0.50 MM
- DISPLACEMENT:
- 49 CC
- MODEL:
- RACER'S CHOICE
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 39.20 MM
- TYPE:
- TOP END
$171.95Qty in Cart: 0Quantity:Price:$171.95Subtotal:
