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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Hot Cams Valve Shim 9.48mm x 1.65mm for Honda CRF450R 2002-2016 5PK948165
HOT CAMS
$10.95Valve clearance drift is inevitable with engine wear—ignoring it costs you horsepower, increases noise, and risks catastrophic valve damage. The Hot Cams 9.48mm x 1.65mm valve shim pack delivers the precision adjustments your Honda CRF450R needs to...09261381- SKU:
- 09261381
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- VALVE SHIM THICKNESS METRIC:
- 1.65 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- MATERIAL:
- STEEL
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
$10.95 -
Hot Cams Valve Shim 9.48mm x 3.10mm for Honda CRF450R 2002-2012 5PK948310
HOT CAMS
$10.95Valve clearance directly impacts combustion efficiency, fuel economy, and engine longevity—and worn shims compromise all three. This five-pack of Hot Cams valve shims keeps your CRF450R's valve train operating at factory specifications, preventing costly...09261410- SKU:
- 09261410
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 3.10 MM
$10.95 -
Hot Cams Valve Shim 9.48mm x 3.20mm for Honda CRF450R 2002-2014 5PK948320
HOT CAMS
$10.95Proper valve clearance is critical to engine longevity and performance—even a few thousandths of an inch out of spec can cause premature wear, valve float, and power loss. The Hot Cams Valve Shim 9.48mm x 3.20mm is a direct replacement for Honda CRF450R...09261412- SKU:
- 09261412
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 3.20 MM
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
$10.95 -
Hot Cams Valve Shim Kit for Honda CRF450R 2002-2018 5PK948340
HOT CAMS
$10.95Valve clearance directly impacts engine performance, fuel efficiency, and longevity—and worn or incorrect shims compromise all three. The Hot Cams Valve Shim Kit delivers precision-engineered replacements to restore optimal clearance on your CRF450R,...09261416- SKU:
- 09261416
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 3.40 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
$10.95 -
On Sale
PROX Piston - GP 760 Waverunner 01.2514.050
PROX
MSRP: $138.95Now: $110.00Was: $138.95Piston for watercraft applications09102745- SKU:
- 09102745
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- BORE SIZE METRIC:
- 84.50 MM
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- EACH
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
MSRP: $138.95Now: $110.00Was: $138.95 -
On Sale
PROX Ring Set 02.1111
PROX
MSRP: $24.95Now: $21.00Was: $24.95Piston rings are fundamental to engine sealing and compression—worn or substandard rings directly compromise power output, fuel efficiency, and oil consumption. The PROX Ring Set 02.1111 delivers OEM-equivalent performance with Japanese manufacturing...09120161- SKU:
- 09120161
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- SET
- PISTON MATERIAL:
- ALUMINUM ALLOY
MSRP: $24.95Now: $21.00Was: $24.95 -
Hinson Racing Clutch Cover KTM 85 SX 2018-2024 C477
HINSON RACING
$169.99The HINSON RACING Clutch Cover C477 is engineered for superior performance, delivering enhanced heat dissipation and durability for demanding racing conditions. Designed and manufactured in the U.S.A., this clutch cover exceeds stock specifications,...09401178- SKU:
- 09401178
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- BILLETPROOF
- MATERIAL:
- T-6 ALUMINUM
- TYPE:
- CLUTCH
- UNITS:
- EACH
$169.99 -
Hinson Racing Clutch Cover for Honda CR250R 2002-2007 C028-002
HINSON RACING
$189.99Enhance your CR250's performance with the HINSON RACING Clutch Cover. Designed for superior heat dissipation and built to withstand the rigors of racing, this clutch cover is a must-have upgrade for serious riders. Proudly made in the U.S.A., it combines...09401255- SKU:
- 09401255
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
- MODEL:
- BILLETPROOF
- MATERIAL:
- T-6 ALUMINUM
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
$189.99 -
Hinson Racing Clutch Cover Yamaha YZ250 2001-2024 C054
HINSON RACING
$159.99Elevate your YZ250's performance with the Hinson Racing Clutch Cover, designed for optimal heat dissipation and unmatched durability. Engineered with race-tested materials, this cover offers a significant upgrade over stock options, ensuring your bike...09401256- SKU:
- 09401256
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- TYPE:
- CLUTCH
- MATERIAL:
- T-6 ALUMINUM
- MODEL:
- BILLETPROOF
$159.99 -
Hinson Racing Clutch Cover Yamaha YZ125 2005-2022 C240
HINSON RACING
$159.99Elevate your YZ125's performance with the HINSON RACING Clutch Cover C240, designed for superior heat dissipation and enhanced durability. This race-proven component ensures that your bike operates at peak efficiency, giving you the competitive edge you...09401260- SKU:
- 09401260
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- MATERIAL:
- T-6 ALUMINUM
- MODEL:
- BILLETPROOF
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
$159.99 -
Hinson Racing Clutch Cover for 2007-2022 Honda CRF150R C390
HINSON RACING
$599.99Enhance your CRF150R's performance with the HINSON RACING Clutch Cover. Engineered for superior heat dissipation and durability, this clutch cover is a must-have for serious racers looking to gain a competitive edge. Proudly made in the U.S.A., it...09401261- SKU:
- 09401261
- Availability:
- Ships Same Business Day
- Weight:
- 2.00 LBS
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- MODEL:
- BILLETPROOF
- MATERIAL:
- T-6 ALUMINUM
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
$599.99 -
Hinson Racing Clutch Cover KTM 250 SX 2013-2016 C500
HINSON RACING
$169.99Elevate your KTM C500's performance with the HINSON RACING Clutch Cover, designed for optimal heat dissipation and enhanced durability. This race-proven component not only outperforms stock covers but also ensures reliability on the toughest tracks...09401476- SKU:
- 09401476
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- COLOR/FINISH:
- BLACK
- MODEL:
- BILLETPROOF
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- COVER
- TYPE:
- CLUTCH
- MATERIAL:
- T-6 ALUMINUM
$169.99 -
Hinson Racing Clutch Cover KTM 250 XC-F 2016-2022 C677
HINSON RACING
$169.99Enhance your KTM's performance with the Hinson Racing Clutch Cover C677, engineered for superior heat management and durability. This race-proven component is crafted in the U.S.A., ensuring top-notch quality and reliability for serious riders. ...09401478- SKU:
- 09401478
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- BILLETPROOF
- UNITS:
- EACH
- MATERIAL:
- T-6 ALUMINUM
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- TYPE:
- CLUTCH
$169.99 -
Hinson Racing Clutch Cover for Honda CRF450R 2017-2024 C789-0816
HINSON RACING
$199.99Elevate your performance with the HINSON RACING Clutch Cover for the CRF450R, designed to enhance durability and efficiency on the track. Crafted from premium T-6 aircraft-quality aluminum, this clutch cover is engineered to withstand the rigors of...09401591- SKU:
- 09401591
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- MATERIAL:
- T-6 ALUMINUM
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
$199.99 -
Hinson Racing Clutch Cover KTM 250 SX 2017-2018 C600
HINSON RACING
$169.99Upgrade your ride with the HINSON RACING Clutch Cover, specifically designed for KTM 250/300 models. This high-performance component enhances heat dissipation and durability, ensuring your bike operates at peak efficiency. Crafted from premium billet T-6...09401592- SKU:
- 09401592
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- MATERIAL:
- T-6 ALUMINUM
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
$169.99 -
Rekluse Clutch Cover KTM 250 EXC 2017-2023 RMS-396
REKLUSE
$229.00Experience top-tier performance and unmatched durability with the REKLUSE Clutch Cover, specifically designed for HUSQVARNA and KTM 250/300 models. Crafted from high-quality billet aluminum, this clutch cover is engineered to withstand the toughest...09401822- SKU:
- 09401822
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- COLOR/FINISH:
- ANODIZED
- MATERIAL:
- BILLET ALUMINUM
- PRODUCT NAME:
- COVER
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- TYPE:
- CLUTCH
- RIDING STYLE:
- STREET
$229.00 -
Hiflofiltro Oil Filter for Aprilia RXV 550 2006-2009 HF563
HIFLOFILTRO
$5.79Experience superior engine protection with the HIFLOFILTRO Oil Filter HF563. Designed for optimal performance, this premium oil filter ensures that your engine runs smoothly and efficiently, extending its lifespan. Trust in a brand that prioritizes...07120212- SKU:
- 07120212
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- COLOR/FINISH:
- YELLOW
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- OFF-ROAD
- WIDTH METRIC:
- 45 MM
- STYLE:
- PREMIUM
- UNITS:
- EACH
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- CARTRIDGE
- BASE COLOR:
- YELLOW
- LENGTH METRIC:
- 49 MM
$5.79 -
Hiflofiltro Oil Filter Aprilia Scarabeo 125 200 2007-2015 HF186
HIFLOFILTRO
$4.76Experience superior engine protection with the HIFLOFILTRO Oil Filter HF186. Designed for optimal performance, this premium oil filter ensures that your engine runs smoothly and efficiently. Trust in high-quality materials and expert engineering to keep...07120300- SKU:
- 07120300
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- RIDING STYLE:
- STREET
- STYLE:
- PREMIUM
- BASE COLOR:
- BLACK
- UNITS:
- EACH
- WIDTH METRIC:
- 41 MM
- COLOR/FINISH:
- BLACK
- LENGTH METRIC:
- 35 MM
- PRODUCT NAME:
- OIL FILTER
- TYPE:
- CARTRIDGE
$4.76 -
VERTEX Piston Kit 23870B
VERTEX
$353.95A piston kit is the foundation of engine reliability and performance—whether you're rebuilding after wear or upgrading for increased displacement and power. The VERTEX Piston Kit 23870B delivers the durability and precision needed for demanding...09103338- SKU:
- 09103338
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 14.5:1
- CYLINDER DIAMETER METRIC:
- 78.00 MM
- DISPLACEMENT:
- 250 CC
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- PISTON DIAMETER METRIC:
- 77.97 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$353.95 -
VERTEX Piston Kit 23925B
VERTEX
$289.95If you're building or rebuilding an engine for serious duty—whether on the track or in competition—piston quality directly impacts reliability and performance longevity. The VERTEX Piston Kit 23925B delivers the metallurgical precision and surface...09103341- SKU:
- 09103341
- Availability:
- Ships Same Business Day
- Weight:
- 0.58 LBS
- CYLINDER DIAMETER METRIC:
- 80.00 MM
- BORE - OVERSIZE:
- +3,00 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- STYLE:
- FORGED BIG BORE
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- ENGINE TYPE:
- 4-STROKE
- BORE - OVERSIZE METRIC:
- +3.00 MM
- DISPLACEMENT:
- 270 CC
- PISTON DIAMETER METRIC:
- 79.96 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
$289.95
