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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Hot Cams Valve Shim 9.48mm x 3.25mm for Honda CRF450R 2002-2012 5PK948325
HOT CAMS
$9.95Enhance your engine's performance with the HOT CAMS Valve Shim 9.48 x 3.25. This convenient 5-pack is designed to replenish your Valve Shim Kits, ensuring optimal valve clearance and efficient engine operation. Crafted for durability and precision, these...09261413- SKU:
- 09261413
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 3.25 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- MATERIAL:
- STEEL
$9.95 -
Hot Cams Valve Shim 9.48mm x 3.30mm for Honda CRF450R 2002-2018 5PK948330
HOT CAMS
$9.95Upgrade your engine's performance with the HOT CAMS Valve Shim 9.48 x 3.30. Designed specifically for valve adjustment, this 5-pack of high-quality shims ensures precise fitment and optimal engine function. Perfect for those looking to maintain or...09261414- SKU:
- 09261414
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 3.30 MM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
$9.95 -
Hot Cams Valve Shim 9.48mm x 3.45mm for Honda CRF450R 2002-2014 5PK948345
HOT CAMS
$9.95Upgrade your engine's performance with the HOT CAMS Valve Shim 9.48 x 3.45. This 5-pack provides essential replacements for your Valve Shim Kits, ensuring optimal valve clearance and improved engine efficiency. Designed for durability and precision,...09261417- SKU:
- 09261417
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- RIDING STYLE:
- STREET
- VALVE SHIM THICKNESS METRIC:
- 3.45 MM
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
$9.95 -
Hot Cams Valve Shim 7.48mm x 3.50mm for Honda CRF150R 2007-2016 5PK748350
HOT CAMS
$9.95Enhance your engine's performance with the HOT CAMS Valve Shim 7.48 x 3.50 pack. Designed for precision and durability, these replacement shims allow you to easily refill your Valve Shim Kits, ensuring optimal valve clearance and engine efficiency...09261348- SKU:
- 09261348
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- VALVE SHIM THICKNESS METRIC:
- 3.50 MM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
$9.95 -
Hot Cams Valve Shim 8.90 x 1.80 for KTM 250 SX-F 2005-2011 5PK890180
HOT CAMS
$10.95Enhance your engine's performance with the HOT CAMS Valve Shim 8.90 x 1.80, designed to provide precise adjustments for optimal valve clearance. This 5-pack is perfect for refilling your Valve Shim Kits, ensuring you have the right components on hand for...09261351- SKU:
- 09261351
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- RIDING STYLE:
- STREET
- VALVE SHIM THICKNESS METRIC:
- 1.80 MM
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
$10.95 -
Hot Cams Valve Shim 8.90mm x 1.92mm for KTM 250 SX-F 2005-2022 5PK890192
HOT CAMS
$10.95Enhance your engine's performance with the HOT CAMS Valve Shim Set, designed to provide precise adjustments for optimal valve clearance. Each pack contains five high-quality shims, ensuring you have the right components to maintain your valve shim kit...09261354- SKU:
- 09261354
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 1.92 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
$10.95 -
Hot Cams Valve Shim 8.90mm x 2.60mm for KTM 250 SX-F 2005-2011 5PK890260
HOT CAMS
$10.95Enhance your engine's performance with the HOT CAMS Valve Shim 8.90 x 2.60. This replacement pack is designed to refill your Valve Shim Kits, ensuring optimal valve clearance and improved engine efficiency. Perfect for enthusiasts and professionals...09261371- SKU:
- 09261371
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 2.60 MM
- RIDING STYLE:
- STREET
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
$10.95 -
Hot Cams Valve Shim 9.48mm x 1.25mm for Honda CRF450R 2002-2014 5PK948125
HOT CAMS
$9.95Enhance your engine's performance with the HOT CAMS Valve Shim pack, designed to provide reliable replacements for your Valve Shim Kits. Each shim measures 9.48 x 1.25 mm, ensuring a perfect fit for various applications. Stock up with this 5-pack to keep...09261373- SKU:
- 09261373
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 1.25 MM
$9.95 -
Hot Cams Valve Shim 9.48mm x 1.30mm for Honda CRF450R 2002-2012 5PK948130
HOT CAMS
$9.95Upgrade your engine's performance with the HOT CAMS Valve Shim 5 Pack. Designed for precision and durability, these shims are essential for maintaining optimal valve clearance and enhancing engine efficiency. Perfect for mechanics and enthusiasts alike,...09261374- SKU:
- 09261374
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- STEEL
- VALVE SHIM THICKNESS METRIC:
- 1.30 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
$9.95 -
Hot Cams Valve Shim 9.48mm x 1.60mm for Honda CRF450R 2002-2014 5PK948160
HOT CAMS
$9.95Enhance your engine's performance with the HOT CAMS Valve Shim 9.48 x 1.60 replacement pack. Designed to refill your Valve Shim Kits, these shims ensure optimal valve clearance and improved engine efficiency. Durable and reliable, they are essential for...09261380- SKU:
- 09261380
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 1.60 MM
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ATV
$9.95 -
Hot Cams Valve Shim 9.48mm x 1.65mm for Honda CRF450R 2002-2016 5PK948165
HOT CAMS
$9.95Enhance your engine's performance with the HOT CAMS Valve Shim pack, designed specifically for precision adjustments in valve clearance. This 5-pack of shims offers a reliable solution for maintaining optimal engine function, ensuring your vehicle runs...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
$9.95 -
Hot Cams Valve Shim 9.48mm x 1.70mm for Honda CRF450R 2002-2018 5PK948170
HOT CAMS
$9.95Enhance your engine's performance with the HOT CAMS Valve Shim pack, designed for precision and durability. Each shim measures 9.48 x 1.70 mm, ensuring a perfect fit for your valve shim kits. Ideal for maintaining optimal valve clearance and improving...09261382- SKU:
- 09261382
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 1.70 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
$9.95 -
Hot Cams Valve Shim 9.48mm x 3.10mm for Honda CRF450R 2002-2012 5PK948310
HOT CAMS
$9.95Enhance your engine's performance with the HOT CAMS Valve Shim Replacement Pack. Designed to refill your Valve Shim Kits, these precision-engineered shims ensure optimal valve clearance and longevity. Each pack contains five shims, making it easy to...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
$9.95 -
Hot Cams Valve Shim 9.48mm x 3.20mm for Honda CRF450R 2002-2014 5PK948320
HOT CAMS
$9.95Enhance your engine's performance with the HOT CAMS Valve Shim 9.48 x 3.20 pack. Designed for precision and reliability, these replacement shims are essential for maintaining optimal valve clearance in your engine. Perfect for refilling your Valve Shim...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
$9.95 -
Hot Cams Valve Shim 9.48mm x 3.35mm for Honda CRF450R 2002-2012 5PK948335
HOT CAMS
$9.95Enhance your engine's performance with the HOT CAMS Valve Shim Replacement Pack. Designed specifically to refill your Valve Shim Kits, these shims ensure optimal valve adjustment and longevity. Each pack contains high-quality shims that meet rigorous...09261415- SKU:
- 09261415
- 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:
- 3.35 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
$9.95 -
Hot Cams Valve Shim Kit for Honda CRF450R 2002-2018 5PK948340
HOT CAMS
$9.95Enhance your engine's performance with the HOT CAMS Valve Shim pack, designed for precision and reliability. This 5-pack of shims is perfect for refilling your Valve Shim Kits, ensuring optimal valve clearance and engine efficiency. High-quality...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
$9.95 -
PROX Piston - GP 760 Waverunner 01.2514.050
PROX
$129.95Piston 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
$129.95 -
PROX Piston - GP 760 Waverunner 01.2514.100
PROX
$129.95Piston for watercraft applications09102747- SKU:
- 09102747
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- PISTON MATERIAL:
- ALUMINUM
- ENGINE TYPE:
- 2-STROKE
- UNITS:
- EACH
- BORE SIZE METRIC:
- 85.00 MM
$129.95 -
PROX Ring Set 02.1111
PROX
$24.95Manufactured in Japan and designed as OEM replacements09120161- 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
$24.95 -
PROX Piston Kit - KTM300EXC '17-'18 01.6387.B
PROX
$189.95Manufactured in Japan and designed to be OEM replacement, Cast from a high-silicon-content aluminum alloy that meets or exceeds OEM specifications, then CNC-machined to extremely close tolerances, Pistons supplied in a kit package that includes rings,...09106265- SKU:
- 09106265
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
$189.95
