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 8.90mm x 1.96mm for KTM 250 SX-F 2005-2011 5PK890196
HOT CAMS
$11.95Valve clearance drift is inevitable in high-revving engines—especially in aggressive riding conditions. Hot Cams Valve Shims are essential wear items that restore proper valve-to-rocker clearance, ensuring your KTM 250 SX-F maintains peak combustion...09261355- SKU:
- 09261355
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 1.96 MM
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
- RIDING STYLE:
- OFF-ROAD
$11.95 -
Hot Cams Valve Shim 8.90mm x 2.00mm for KTM 250 SX-F 2005-2011 5PK890200
HOT CAMS
$11.95Valve clearance directly impacts combustion efficiency, ignition timing, and overall engine longevity. These HOT CAMS shims are precision-engineered to maintain exact clearance specifications on your KTM 250 SX-F, preventing valve overlap issues and loss...09261356- SKU:
- 09261356
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- SNOW
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- VALVE SHIM THICKNESS METRIC:
- 2.00 MM
- MATERIAL:
- STEEL
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
$11.95 -
Hot Cams Valve Shim 9.48mm x 1.20mm for Honda CRF450R 2002-2014 5PK948120
HOT CAMS
$10.95Valve clearance directly impacts combustion efficiency, power delivery, and engine longevity—especially in high-revving applications like the CRF450R. Hot Cams valve shims deliver the precision adjustment your engine needs to maintain optimal clearance...09261372- SKU:
- 09261372
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- VALVE SHIM THICKNESS METRIC:
- 1.20 MM
$10.95 -
Hot Cams Valve Shim 9.48 x 1.40 for Honda CRF450R 2002-2023 5PK948140
HOT CAMS
$10.95Valve clearance directly impacts engine efficiency, combustion timing, and overall performance—and worn or incorrect shims compromise all three. The Hot Cams 9.48 x 1.40 shim pack gives you precision-engineered replacements to restore proper valve lash...09261376- SKU:
- 09261376
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 1.40 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
$10.95 -
Hot Cams Valve Shim 9.48mm x 1.45mm for Honda CRF450R 2002-2018 5PK948145
HOT CAMS
$10.95Valve clearance directly impacts combustion efficiency, noise levels, and engine longevity—and these HOT CAMS shims give you precise control over that critical tolerance. Whether you're rebuilding after a top-end refresh or fine-tuning an existing setup,...09261377- SKU:
- 09261377
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ATV
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 1.45 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
$10.95 -
Hot Cams Valve Shim 9.48mm x 1.50mm for Honda CRF450R 2002-2023 5PK948150
HOT CAMS
$10.95Valve clearance directly impacts engine performance, combustion efficiency, and component longevity—especially critical on high-revving engines like the CRF450R. Hot Cams valve shims ensure precise clearance maintenance without compromising reliability,...09261378- SKU:
- 09261378
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- VALVE SHIM THICKNESS METRIC:
- 1.50 MM
$10.95 -
Wiseco Piston Kit Kawasaki JS550 1991-1995 75.50mm Bore WK1046
WISECO
$349.95A complete piston kit rebuild is essential when your JS550 engine shows signs of wear, loss of compression, or if you're pushing higher RPMs and demand absolute reliability. Wiseco's high-silicon forged aluminum construction delivers the strength needed...WK1046- SKU:
- WK1046
- Availability:
- Ships Same Business Day
- Weight:
- 2.19 LBS
- RIDING STYLE:
- WATERCRAFT
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 75.50 MM
- PISTON DIAMETER METRIC:
- 75.40 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- +0,50 MM
- DISPLACEMENT:
- 537 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
$349.95 -
Rekluse Clutch Cover Sherco 250 SE-R 2018-2025 RMS-0408001
REKLUSE
$229.00The stock clutch cover on your Sherco 250 SE-R leaves performance on the table. A deeper oil capacity directly translates to better clutch cooling and more consistent lever feel through intense riding sessions, while a billet aluminum construction...09401979- SKU:
- 09401979
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BILLET ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
$229.00 -
Rekluse Clutch Cover Beta 350 RR 2020-2025 RMS-0402028
REKLUSE
$229.00The stock clutch cover on your Beta 350 RR is vulnerable to impact damage and thermal stress during aggressive trail riding. This Rekluse billet aluminum replacement delivers superior protection, increased oil capacity for better heat management, and the...09401943- SKU:
- 09401943
- Availability:
- Ships Same Business Day
- Weight:
- 0.96 LBS
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BILLET ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
- RIDING STYLE:
- STREET
$229.00 -
Rekluse Clutch Cover GasGas EC 250 2018-2019 RMS-300
REKLUSE
$279.00Off-road riding demands protection that doesn't compromise on durability or engine reliability. The Rekluse Clutch Cover for your GasGas EC 250/300 shields critical components from trail impacts while increasing oil capacity for superior lubrication...09401777- SKU:
- 09401777
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- ANODIZED
- MATERIAL:
- BILLET ALUMINUM
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
$279.00 -
Rekluse Clutch Cover GasGas EC 200 2000-2011 RMS-302
REKLUSE
$229.00Trail damage to your stock clutch cover risks oil leaks, reduced lubrication, and costly engine repairs. The Rekluse billet aluminum cover provides superior impact resistance while increasing oil capacity for better thermal management and engine...09401778- SKU:
- 09401778
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BILLET ALUMINUM
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- STREET
- TYPE:
- CLUTCH
- UNITS:
- EACH
$229.00 -
Rekluse Clutch Cover KTM 65 SX 2009-2025 RMS-387
REKLUSE
$229.00The stock clutch cover on your KTM 65 SX is vulnerable to damage from rocks, roots, and impacts that are inevitable in aggressive riding. The Rekluse RMS-387 clutch cover replaces that weak point with billet aluminum construction and a deeper design that...09401818- SKU:
- 09401818
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- TYPE:
- CLUTCH
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BILLET ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- COVER
$229.00 -
Rekluse Clutch Cover KTM 125 SX 2016-2022 RMS-390
REKLUSE
$229.00If you're running a KTM 125 SX on the trail or track, the stock clutch cover is your first point of failure when things get rough. The Rekluse RMS-390 replaces that vulnerable component with billet aluminum construction that resists impacts from rocks...09401819- SKU:
- 09401819
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- TYPE:
- CLUTCH
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BILLET ALUMINUM
- RIDING STYLE:
- OFF-ROAD
$229.00 -
HifloFiltro Oil Filter for Beta RR 350 4T 2011-2024 HF631
HIFLOFILTRO
$8.08Proper oil filtration is non-negotiable for engine longevity, especially in high-demand 4-stroke applications. The HifloFiltro HF631 delivers OEM-grade filtration without compromise, removing contaminants that degrade oil viscosity and accelerate wear...07120423- SKU:
- 07120423
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- BASE COLOR:
- YELLOW
- STYLE:
- PREMIUM
- LENGTH METRIC:
- 120 MM
- PRODUCT NAME:
- OIL FILTER
- WIDTH METRIC:
- 29 MM
- COLOR/FINISH:
- YELLOW
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- CARTRIDGE
- UNITS:
- EACH
$8.08 -
Hiflofiltro Oil Filter for Yamaha WaveRunner FX HO 2009-2016 HF740
HIFLOFILTRO
$9.13Proper oil filtration is critical for maintaining engine longevity and performance on your WaveRunner FX HO, especially during high-RPM operation. The Hiflofiltro HF740 removes contaminants and debris that can accelerate wear on internal components,...07120476- SKU:
- 07120476
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- COLOR/FINISH:
- BLACK
- UNITS:
- EACH
- PRODUCT NAME:
- OIL FILTER
- TYPE:
- SPIN-ON
- LENGTH METRIC:
- 80 MM
- BASE COLOR:
- BLACK
- RIDING STYLE:
- WATERCRAFT
- STYLE:
- PREMIUM
- WIDTH METRIC:
- 74 MM
$9.13 -
Hiflofiltro Oil Filter for BMW G450X 2009-2010 Husqvarna TC449 2011-2012 TE449 2011-2012 TE511 2011-2013 Sherco 450 Enduro/SM 2004-2007 HF611
HIFLOFILTRO
$5.45Keeping your engine clean is non-negotiable in off-road and track environments where dust, dirt, and debris are constant threats. The Hiflofiltro HF611 delivers high-efficiency filtration that protects critical engine components while maintaining proper...07120214- SKU:
- 07120214
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- COLOR/FINISH:
- YELLOW
- LENGTH METRIC:
- 87 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- CARTRIDGE
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- WIDTH METRIC:
- 41 MM
- PRODUCT NAME:
- OIL FILTER
- BASE COLOR:
- YELLOW
- STYLE:
- PREMIUM
$5.45 -
Hiflofiltro Oil Filter for Husqvarna FC250 2014-2020 HF652
HIFLOFILTRO
$6.45Engine longevity depends on reliable oil filtration, and the Hiflofiltro HF652 delivers the protection your Husqvarna FC250 demands. This OEM-equivalent filter removes contaminants and maintains consistent oil flow under racing conditions, keeping your...07120215- SKU:
- 07120215
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BASE COLOR:
- RED
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- CARTRIDGE
- STYLE:
- PREMIUM
- COLOR/FINISH:
- RED
- LENGTH METRIC:
- 87 MM
- UNITS:
- EACH
- WIDTH METRIC:
- 33 MM
$6.45 -
HifloFiltro Oil Filter for Honda CRF150R 2007-2025 HF116
HIFLOFILTRO
$4.34Consistent oil filtration is critical for engine longevity on your Honda CRF150R. The HifloFiltro HF116 traps contaminants effectively while maintaining optimal oil flow, reducing wear on internal components and keeping your engine running at peak...07120034- SKU:
- 07120034
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- OFF-ROAD
- BASE COLOR:
- RED
- STYLE:
- PREMIUM
- COLOR/FINISH:
- RED
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- CARTRIDGE
- WIDTH METRIC:
- 38 MM
- LENGTH METRIC:
- 36 MM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$4.34 -
Hiflofiltro Oil Filter for KTM 250 SX-F 2005-2012 HF655
HIFLOFILTRO
$6.71Keeping your KTM 250 SX-F running at peak performance demands filtration you can trust. The Hiflofiltro HF655 delivers the engine protection serious racers and weekend warriors need, removing contaminants without sacrificing flow rate or reliability...07120098- SKU:
- 07120098
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- BASE COLOR:
- YELLOW
- STYLE:
- PREMIUM
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- CARTRIDGE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- WIDTH METRIC:
- 41 MM
- COLOR/FINISH:
- YELLOW
- LENGTH METRIC:
- 69 MM
$6.71 -
Hiflofiltro Oil Filter for Polaris 800 Sportsman 2005 HF198
HIFLOFILTRO
$9.37Keep your Polaris 800 Sportsman running clean and efficient with the Hiflofiltro HF198 oil filter—engineered to trap contaminants before they circulate through your engine. Regular oil filter maintenance is non-negotiable for preventing premature wear,...07120549- SKU:
- 07120549
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- RIDING STYLE:
- ATV
- WIDTH METRIC:
- 65 MM
- BASE COLOR:
- BLACK
- LENGTH METRIC:
- 95 MM
- STYLE:
- PREMIUM
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- UTV
- PRODUCT NAME:
- OIL FILTER
- TYPE:
- SPIN-ON
$9.37
