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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Wiseco Piston Kit Suzuki RM85 2002-2023 RE901M04800
WISECO
$134.95The Wiseco Piston Kit RE901M04800 is purpose-built for the Suzuki RM85 (2002-2023), delivering the strength and precision required for competitive racing and high-performance riding. Stock pistons...09105105- SKU:
- 09105105
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- BORE SIZE METRIC:
- 48.00 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
$134.95Qty in Cart: 0Quantity:Price:$134.95Subtotal: -
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...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 -
On Sale
Wossner Piston Kit 53.94mm Yamaha YZ125 2002-2004 8072DA
WOSSNER
MSRP: $122.00Now: $115.90Was: $122.00When you're pushing a YZ125 to its limits, piston durability and ring seal integrity are non-negotiable. The Wossner 8072DA is engineered to handle the demands of 2-stroke racing—delivering...09104787- SKU:
- 09104787
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON SIZE METRIC:
- 53.94 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 54.00 MM
- TYPE:
- SINGLE RING
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
MSRP: $122.00Now: $115.90Was: $122.00Qty in Cart: 0Quantity:Price:MSRP: $122.00Now: $115.90Was: $122.00Subtotal: -
On Sale
Wossner Piston Kit 54.00mm Yamaha YZ125 2002-2004 8072DB
WOSSNER
MSRP: $122.00Now: $115.90Was: $122.00When you're pushing a YZ125 to its limits on the track, your piston kit needs to match your ambition. The Wössner 8072DB delivers the durability and precision German engineering demands, with a...09104788- SKU:
- 09104788
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +0.01 MM
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 54.01 MM
- PISTON SIZE METRIC:
- 53.95 MM
- TYPE:
- SINGLE RING
- BORE - OVERSIZE:
- +0,01 MM
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
MSRP: $122.00Now: $115.90Was: $122.00Qty in Cart: 0Quantity:Price:MSRP: $122.00Now: $115.90Was: $122.00Subtotal: -
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...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
$229.00Qty in Cart: 0Quantity:Price:$229.00Subtotal: -
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,...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...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...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...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
$229.00Qty in Cart: 0Quantity:Price:$229.00Subtotal: -
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...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...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
$8.08Qty in Cart: 0Quantity:Price:$8.08Subtotal: -
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...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...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...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...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...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...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 -
HifloFiltro Oil Filter for Husqvarna 701 Enduro 2016-2022 HF651
HIFLOFILTRO
$6.11Regular oil changes are non-negotiable for engine longevity, but only a quality filter ensures your fresh oil stays clean between services. The HifloFiltro HF651 delivers OEM-level filtration for...07120445- SKU:
- 07120445
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- COLOR/FINISH:
- RED
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- CARTRIDGE
- UNITS:
- EACH
- WIDTH METRIC:
- 41.5 MM
- RIDING STYLE:
- OFF-ROAD
- LENGTH METRIC:
- 53 MM
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- STREET
- BASE COLOR:
- RED
- STYLE:
- PREMIUM
$6.11 -
On Sale
VERTEX Piston Kit 23924B
VERTEX
MSRP: $279.95Now: $179.00Was: $279.95Whether you're rebuilding a high-mileage engine or constructing a purpose-built race motor, piston quality directly impacts reliability, longevity, and peak performance. The VERTEX Piston Kit 23924B...09103331- SKU:
- 09103331
- Availability:
- Ships Same Business Day
- Weight:
- 0.93 LBS
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +3.00 MM
- CYLINDER DIAMETER METRIC:
- 99.00 MM
- DISPLACEMENT:
- 480 CC
- PISTON DIAMETER METRIC:
- 98.97 MM
- STYLE:
- FORGED BIG BORE
- BORE - OVERSIZE:
- +3,00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.6:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
MSRP: $279.95Now: $179.00Was: $279.95 -
VERTEX Piston Kit 23867A
VERTEX
$327.95The VERTEX Piston Kit 23867A delivers the durability and precision needed for serious engine builds, whether you're chasing reliability or maximum performance. Built from premium materials with...09103334- SKU:
- 09103334
- Availability:
- Ships Same Business Day
- Weight:
- 0.62 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.9:1
- CYLINDER DIAMETER METRIC:
- 81.00 MM
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- BORE - OVERSIZE:
- +3,00 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- BORE - OVERSIZE METRIC:
- +3.00 MM
- DISPLACEMENT:
- 270 CC
- PISTON DIAMETER METRIC:
- 80.96 MM
- RIDING STYLE:
- STREET
- STYLE:
- FORGED BIG BORE
$327.95
