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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EMGO Oil Filter 10-26959
EMGO
$4.77Engine longevity depends on consistent oil cleanliness, and the EMGO 10-26959 delivers OEM-grade filtration to keep contaminants out of critical engine passages. Constructed from premium paper, metal, and rubber components, this filter maintains...07120403- SKU:
- 07120403
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- FEATURES:
- STANDARD
- FILTER MEDIA MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- YELLOW
- PRODUCT NAME:
- ELEMENT
- TYPE:
- OIL FILTER
- BASE COLOR:
- YELLOW
- UNITS:
- EACH
$4.77 -
EMGO Oil Filter 10-26957
EMGO
$4.62Clean oil is the foundation of engine longevity, and a quality filter is your first line of defense against wear-causing contaminants. The EMGO Oil Filter 10-26957 uses premium materials throughout—high-grade paper, robust metal, and durable rubber...07120402- SKU:
- 07120402
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- OFF-ROAD
- FEATURES:
- STANDARD
- FILTER MEDIA MATERIAL:
- PAPER
- TYPE:
- CARTRIDGE
- UNITS:
- EACH
- COLOR/FINISH:
- YELLOW
- BASE COLOR:
- YELLOW
- RIDING STYLE:
- STREET
$4.62 -
EMGO Oil Filter 10-26955
EMGO
$6.62Clean oil is the foundation of engine longevity—contaminated oil accelerates wear on critical internal components, reducing performance and shortening engine life. The EMGO Oil Filter 10-26955 uses premium filtration media and robust construction to trap...07120400- SKU:
- 07120400
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- PRODUCT NAME:
- ELEMENT
- TYPE:
- OIL FILTER
- UNITS:
- EACH
- COLOR/FINISH:
- ORANGE
- FEATURES:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- BASE COLOR:
- ORANGE
- FILTER MEDIA MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
$6.62 -
EMGO Oil Filter 10-26992
EMGO
$7.54Engine longevity depends on clean oil circulating through critical components, and a quality oil filter is non-negotiable for maintaining that protection. The EMGO 10-26992 uses premium materials—high-grade paper, robust metal construction, and durable...07120391- SKU:
- 07120391
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- FEATURES:
- STANDARD
- FILTER MEDIA MATERIAL:
- PAPER
- RIDING STYLE:
- ATV
- PRODUCT NAME:
- OIL FILTER
- COLOR/FINISH:
- YELLOW
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- CARTRIDGE
- BASE COLOR:
- YELLOW
- UNITS:
- EACH
$7.54 -
EMGO Oil Filter 10-99220
EMGO
$3.85Engine longevity depends on consistent oil quality, and a premium filter is your first line of defense against contaminants that accelerate wear and reduce efficiency. The EMGO Oil Filter 10-99220 uses high-grade paper, metal, and rubber construction to...07120270- SKU:
- 07120270
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- BASE COLOR:
- YELLOW
- PRODUCT NAME:
- ELEMENT
- TYPE:
- OIL FILTER
- FEATURES:
- STANDARD
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- FILTER MEDIA MATERIAL:
- PAPER
- COLOR/FINISH:
- YELLOW
- RIDING STYLE:
- OFF-ROAD
$3.85 -
EMGO Oil/Fuel Line - Black - 3/8" - 25' 14-03731
EMGO
$33.54A quality fuel and oil line is fundamental to any reliable fuel system or custom build. The EMGO 3/8" line offers reinforced construction to handle both fuel and oil applications without degradation, making it an essential consumable for racers and...07110062- SKU:
- 07110062
- Availability:
- Ships Same Business Day
- Weight:
- 3.79 LBS
- INSIDE DIAMETER IMPERIAL:
- 3/8'
- MATERIAL:
- RUBBER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- FUEL
- BASE COLOR:
- BLACK
- INSIDE DIAMETER METRIC:
- 9.5 MM
- LENGTH METRIC:
- 7.62 M
- PRODUCT NAME:
- HOSE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- LENGTH IMPERIAL:
- 25'
- MATERIAL:
- NEOPRENE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- TYPE:
- OIL LINE
- RIDING STYLE:
- STREET
- RIDING STYLE:
- WATERCRAFT
$33.54 -
EMGO Oil/Fuel Line - Black - 5/16" - 25' 14-03721
EMGO
$28.77Quality fuel and oil lines are foundational to any reliable fuel system—whether you're building a custom carbureted engine, upgrading a fuel-injected platform, or fabricating a complete fuel delivery setup. This EMGO reinforced line handles both fuel and...07110061- SKU:
- 07110061
- Availability:
- Ships Same Business Day
- Weight:
- 3.82 LBS
- INSIDE DIAMETER METRIC:
- 7.9 MM
- RIDING STYLE:
- STREET
- RIDING STYLE:
- WATERCRAFT
- BASE COLOR:
- BLACK
- LENGTH METRIC:
- 7.62 M
- PRODUCT NAME:
- HOSE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- LENGTH IMPERIAL:
- 25'
- MATERIAL:
- NEOPRENE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- TYPE:
- OIL LINE
- INSIDE DIAMETER IMPERIAL:
- 5/16'
- MATERIAL:
- RUBBER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- FUEL
$28.77 -
EMGO Oil/Fuel Line - Black - 1/4" - 25' 14-03711
EMGO
$23.38A quality fuel and oil line is non-negotiable for reliable engine performance and safety. Whether you're building a custom fuel system, replacing deteriorated lines, or fabricating a complete fuel delivery setup, this reinforced hose handles both fuel...07110060- SKU:
- 07110060
- Availability:
- Ships Same Business Day
- Weight:
- 2.61 LBS
- INSIDE DIAMETER IMPERIAL:
- 1/4'
- MATERIAL:
- RUBBER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- FUEL
- BASE COLOR:
- BLACK
- INSIDE DIAMETER METRIC:
- 6.4 MM
- LENGTH METRIC:
- 7.62 M
- PRODUCT NAME:
- HOSE
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- LENGTH IMPERIAL:
- 25'
- MATERIAL:
- NEOPRENE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- OIL LINE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
$23.38 -
BOYESEN Impeller Pump CR250 WPI-02
BOYESEN
$79.95Stock water pumps struggle to maintain consistent coolant flow under sustained high-RPM conditions, allowing temperatures to spike and robbing horsepower when you need it most. The BOYESEN Impeller Pump CR250 (WPI-02) is engineered to maximize flow rate...WPI02- SKU:
- WPI02
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- UNITS:
- EACH
- MATERIAL:
- ALUMINUM
- MODEL:
- SUPERCOOLER
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- IMPELLER
- TYPE:
- WATER PUMP
$79.95 -
BOYESEN Ignition Cover - Black - YZ125 SC33B
BOYESEN
$87.95Factory Ignition Cover SC33B Professional appearance enhances your engine's aesthetic. Seals effectively to protect engine components from dirt and moisture. Durable construction outperforms standard stock covers. Manufactured from...SC33B- SKU:
- SC33B
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- MATERIAL:
- ALUMINUM
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION
- UNITS:
- EACH
- COLOR/FINISH:
- POWDER-COATED
- MODEL:
- FACTORY RACING
$87.95 -
BOYESEN Ignition Cover - Black - KX250 SC12B
BOYESEN
$87.95Factory Ignition Cover SC12B Professional-grade design enhances the look of your engine. Seals effectively to protect against dirt and water intrusion. Durable construction outlasts standard stock covers. Manufactured from premium...SC12B- SKU:
- SC12B
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
- COLOR/FINISH:
- POWDER-COATED
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION
- MATERIAL:
- ALUMINUM
- MODEL:
- FACTORY RACING
$87.95 -
BOYESEN Ignition Cover - Black - CR250 SC02B
BOYESEN
$87.95Factory Ignition Cover SC02B Professional appearance enhances your engine's look. Seals effectively to protect against dirt and water intrusion. Durable design outlasts standard stock covers. Crafted from premium aluminum for strength...SC02B- SKU:
- SC02B
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
- MATERIAL:
- ALUMINUM
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- COLOR/FINISH:
- POWDER-COATED
- MODEL:
- FACTORY RACING
- TYPE:
- IGNITION
$87.95 -
BOYESEN Clutch Cover - Black - YZ250 CC32AB
BOYESEN
$95.95A clutch cover does more than protect—it's a visual statement of your commitment to precision engineering and race-ready performance. The BOYESEN CC32AB delivers lightweight construction that reduces rotating mass without compromising durability, while...CC32AB- SKU:
- CC32AB
- Availability:
- Ships Same Business Day
- Weight:
- 1.13 LBS
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- POWDER-COATED
- MODEL:
- FACTORY RACING
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- TYPE:
- CLUTCH
- RIDING STYLE:
- OFF-ROAD
$95.95 -
BOYESEN Clutch Cover - Black - RM125 CC21AB
BOYESEN
$95.95A lightweight clutch cover reduces unsprung weight while maintaining the durability your race engine demands. Boyesen's individually surfaced design eliminates leak-prone fitment issues that plague generic covers, keeping your RM125 sealed tight through...CC21AB- SKU:
- CC21AB
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
- COLOR/FINISH:
- POWDER-COATED
- MODEL:
- FACTORY RACING
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
$95.95 -
BOYESEN Clutch Cover - Black - KX250 CC12B
BOYESEN
$95.95If you're running KX250 race applications, clutch cover integrity directly impacts both performance reliability and engine protection. The BOYESEN CC12B delivers lightweight construction that reduces rotating mass while maintaining the structural...CC12B- SKU:
- CC12B
- Availability:
- Ships Same Business Day
- Weight:
- 1.13 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- POWDER-COATED
- MODEL:
- FACTORY RACING
- TYPE:
- CLUTCH
- PRODUCT NAME:
- COVER
$95.95 -
BOYESEN Clutch Cover - Black - KX125 CC-11AB
BOYESEN
$95.95A lightweight clutch cover is essential for reducing unsprung weight and improving your kart's power-to-weight ratio—critical gains on the track. The Boyesen CC-11AB delivers factory-level protection without the excess mass, letting your KX125 respond...CC11AB- SKU:
- CC11AB
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- FACTORY RACING
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- POWDER-COATED
- TYPE:
- CLUTCH
- PRODUCT NAME:
- COVER
$95.95 -
BOYESEN Clutch Cover - Black - CR250 CC-02AB
BOYESEN
$95.95A clutch cover serves as both a protective barrier and a visual statement on your CR250. The BOYESEN Lightweight Clutch Cover combines race-proven durability with a factory-quality finish, eliminating the performance drag and aesthetic compromises of...CC02AB- SKU:
- CC02AB
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- COVER
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- POWDER-COATED
- MODEL:
- FACTORY RACING
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
$95.95 -
BOYESEN Clutch Cover - Black - CR125 CC01B
BOYESEN
$95.95A lightweight clutch cover is essential for reducing unsprung weight and improving your CR125's overall performance dynamics. The BOYESEN Clutch Cover delivers factory-grade protection without the excess mass of OEM units, while its precision-surfaced...CC01B- SKU:
- CC01B
- Availability:
- Ships Same Business Day
- Weight:
- 0.94 LBS
- MODEL:
- FACTORY RACING
- TYPE:
- CLUTCH
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- COVER
- COLOR/FINISH:
- POWDER-COATED
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$95.95 -
BOYESEN Clutch Cover - Black - CR125 CC01AB
BOYESEN
$95.95A factory-spec clutch cover that combines lightweight construction with race-proven durability—perfect for CR125 riders who demand both performance and reliability. The individually surfaced design eliminates common leak points, while the powder-coated...CC01AB- SKU:
- CC01AB
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- POWDER-COATED
- MODEL:
- FACTORY RACING
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
$95.95 -
BOYESEN Impeller Pump CRF450 WPI-06
BOYESEN
$79.95Water temperature consistency is critical to maintaining peak horsepower and engine reliability during extended racing sessions. The BOYESEN Impeller Pump WPI-06 increases coolant flow while reducing hydraulic friction, keeping your CRF450 running cooler...09500026- SKU:
- 09500026
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- UNITS:
- EACH
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- IMPELLER
- MODEL:
- SUPERCOOLER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
$79.95
