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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Hinson Racing Clutch Cover Kawasaki KX250F 2009-2018 C357
HINSON RACING
$169.99Clutch cover durability separates fast lap times from mechanical failures. The Hinson Racing Clutch Cover for your KX250F delivers superior heat dissipation and structural integrity under the stress...09400817- SKU:
- 09400817
- Availability:
- Ships Same Business Day
- Weight:
- 0.66 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
- COLOR/FINISH:
- BLACK
- MATERIAL:
- T-6 ALUMINUM
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- MODEL:
- BILLETPROOF
$169.99Qty in Cart: 0Quantity:Price:$169.99Subtotal: -
Hinson Racing Clutch Cover for Kawasaki KX450F 2006-2015 C263
HINSON RACING
$169.99Stock clutch covers weren't engineered to handle the sustained heat and abuse of competitive racing. The Hinson Racing Clutch Cover for your KX450F delivers measurably better heat dissipation and...09400825- SKU:
- 09400825
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
- COLOR/FINISH:
- BLACK
- MATERIAL:
- T-6 ALUMINUM
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- MODEL:
- BILLETPROOF
$169.99Qty in Cart: 0Quantity:Price:$169.99Subtotal: -
Hinson Racing Clutch Cover CRF250R 2010-2016 C494
HINSON RACING
$199.99Stock clutch covers can't handle the thermal demands of competitive riding—they fail when you need them most. The Hinson Racing C494 delivers superior heat dissipation and durability, keeping your...09400980- SKU:
- 09400980
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- MATERIAL:
- T-6 ALUMINUM
- TYPE:
- CLUTCH
- UNITS:
- EACH
- PRODUCT NAME:
- COVER
- MODEL:
- BILLETPROOF
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- BLACK
$199.99Qty in Cart: 0Quantity:Price:$199.99Subtotal: -
Rekluse Clutch Cover Yamaha YZ125 2005-2025 RMS-392
REKLUSE
$189.00Protecting your clutch cover from impact damage and contamination is essential for maintaining consistent clutch performance on the track or trail. The Rekluse RMS-392 billet aluminum cover delivers...09401820- SKU:
- 09401820
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BILLET ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
$189.00Qty in Cart: 0Quantity:Price:$189.00Subtotal: -
Rekluse Clutch Cover Suzuki RM-Z250 2007-2025 RMS-467
REKLUSE
$189.00Trail riding and motocross demand clutch covers that can absorb punishment without compromising durability or oil capacity. The Rekluse RMS-467 delivers billet aluminum construction with a deeper...09401832- SKU:
- 09401832
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- COVER
- COLOR/FINISH:
- ANODIZED
- MATERIAL:
- BILLET ALUMINUM
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
$189.00Qty in Cart: 0Quantity:Price:$189.00Subtotal: -
VERTEX Piston Kit - High Compression 24116B
VERTEX
$296.95If you're building a high-compression engine that demands reliability under sustained load, the VERTEX Piston Kit 24116B delivers the precision and durability required for consistent power output...09104118- SKU:
- 09104118
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 88.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 87.97 MM
- RIDING STYLE:
- STREET
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- 15.1:1
- DISPLACEMENT:
- 350 CC
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
$296.95Qty in Cart: 0Quantity:Price:$296.95Subtotal: -
VERTEX Piston Kit 24105B
VERTEX
$71.95A piston kit is the heart of your engine's combustion cycle, and the VERTEX Piston Kit 24105B is engineered to handle the demands of high-RPM racing and performance applications. The advanced...09104135- SKU:
- 09104135
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- CYLINDER DIAMETER METRIC:
- 39.00 MM
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON DIAMETER METRIC:
- 38.95 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
- DISPLACEMENT:
- 50 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$71.95Qty in Cart: 0Quantity:Price:$71.95Subtotal: -
On Sale
VERTEX Piston Kit - High Compression 23960B
VERTEX
MSRP: $301.95Now: $193.00Was: $301.95Maximum compression means maximum power—the VERTEX Piston Kit 23960B delivers the elevated compression ratio you need to unlock additional horsepower and torque from your engine. Built with precision...09103403- SKU:
- 09103403
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 96.95 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- RIDING STYLE:
- OFF-ROAD
- CYLINDER DIAMETER METRIC:
- 97.00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.7:1
- DISPLACEMENT:
- 450 CC
- PRODUCT NAME:
- PISTON KIT
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
MSRP: $301.95Now: $193.00Was: $301.95Qty in Cart: 0Quantity:Price:MSRP: $301.95Now: $193.00Was: $301.95Subtotal: -
VERTEX Piston Kit 23961A
VERTEX
$235.95The VERTEX Piston Kit 23961A delivers the durability and precision your engine demands during sustained high-RPM operation. Built with advanced heat treatment and a specialized skirt coating, these...09103405- SKU:
- 09103405
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
$235.95Qty in Cart: 0Quantity:Price:$235.95Subtotal: -
VERTEX Piston Kit 24273A
VERTEX
$218.95The VERTEX Piston Kit 24273A delivers the durability and precision your engine demands, whether you're pushing peak RPMs on the track or rebuilding a tired top end. VERTEX's heat-treated,...09105128- SKU:
- 09105128
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
$218.95Qty in Cart: 0Quantity:Price:$218.95Subtotal: -
VERTEX Piston Kit 24273B
VERTEX
$242.95The VERTEX Piston Kit 24273B delivers the durability and precision engineering your engine demands, whether you're chasing lap times or maximizing street performance. Built with forged 2618 aluminum...09105129- SKU:
- 09105129
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
$242.95Qty in Cart: 0Quantity:Price:$242.95Subtotal: -
VERTEX Piston Kit 24119B
VERTEX
$218.95The VERTEX Piston Kit 24119B delivers the durability and precision your engine demands under extreme conditions. With advanced heat treatment and specialized coatings designed to reduce friction...09104084- SKU:
- 09104084
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
$218.95Qty in Cart: 0Quantity:Price:$218.95Subtotal: -
VERTEX Piston Kit - High Compression 24123C
VERTEX
$138.95The VERTEX Piston Kit 24123C delivers the compression ratio and durability your high-performance engine demands. Built with precision metallurgy and proven coatings, these pistons reduce break-in...09104102- SKU:
- 09104102
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- COMPRESSION RATIO IMPERIAL:
- 14.2:1
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- PISTON DIAMETER METRIC:
- 76.97 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$138.95Qty in Cart: 0Quantity:Price:$138.95Subtotal: -
VERTEX Piston Kit 24105A
VERTEX
$71.95A quality piston kit is fundamental to engine reliability and performance longevity—especially under high-RPM and boost conditions. The VERTEX Piston Kit 24105A combines precision engineering with...09104134- SKU:
- 09104134
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- CYLINDER DIAMETER METRIC:
- 39.00 MM
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 50 CC
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON DIAMETER METRIC:
- 38.94 MM
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
$71.95Qty in Cart: 0Quantity:Price:$71.95Subtotal: -
VERTEX Piston Kit - High Compression VTKTC23236C
VERTEX
$342.95VERTEX high-compression pistons deliver the durability and precision required for sustained high-RPM performance without sacrificing reliability. Built with aerospace-grade heat treatment and...09103747- SKU:
- 09103747
- Availability:
- Ships Same Business Day
- Weight:
- 2.05 LBS
$342.95Qty in Cart: 0Quantity:Price:$342.95Subtotal: -
VERTEX Piston Kit VTKTC23259B
VERTEX
$314.95A high-performance piston kit must withstand extreme combustion pressures and thermal cycling without sacrificing reliability—especially if you're pushing peak horsepower. The VERTEX Piston Kit...09103751- SKU:
- 09103751
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
$314.95 -
VERTEX Piston Kit VTKTC23443B
VERTEX
$321.95A piston kit forms the foundation of any high-performance engine build, directly impacting compression, durability, and power output. The VERTEX Piston Kit VTKTC23443B delivers precision-engineered...09103761- SKU:
- 09103761
- Availability:
- Ships Same Business Day
- Weight:
- 1.75 LBS
$321.95Qty in Cart: 0Quantity:Price:$321.95Subtotal: -
VERTEX Piston Kit - High Compression VTKTC23647B
VERTEX
$313.95High-compression pistons are essential for maximizing power output and engine efficiency in forced-induction and high-boost applications. The VERTEX Piston Kit delivers precision-engineered...09103800- SKU:
- 09103800
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
$313.95Qty in Cart: 0Quantity:Price:$313.95Subtotal: -
VERTEX Piston Kit 23711B
VERTEX
$302.95A quality piston kit is the foundation of reliable engine performance, and the VERTEX Piston Kit 23711B delivers the durability and precision needed for both street and race applications. Whether...09102594- SKU:
- 09102594
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
$302.95 -
VERTEX Piston Circlips - 4-Stroke 72090K
VERTEX
$4.15Piston circlips are critical retention components that prevent piston pin migration during high-RPM operation. Worn or damaged circlips can lead to catastrophic engine failure, making OEM-quality...09130060- SKU:
- 09130060
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- STREET
- APPLICATION:
- PISTON
- PRODUCT NAME:
- CIRCLIP
- UNITS:
- PAIR
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
$4.15
