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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- Price
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ACERBIS X-Power Kit - Black - Husqvarna/KTM 2977600001
ACERBIS
$76.95Off-road riding exposes your engine's critical components to constant assault from flying debris, mud, and impact hazards. The ACERBIS X-Power Kit shields your motor's most vulnerable areas—crankcase, clutch cover, water pump, and ignition...05052353- SKU:
- 05052353
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
$76.95 -
ACERBIS X-Power Kit - Black - Gas Gas/Husqvarna/KTM 2979430001
ACERBIS
$76.95Off-road riding exposes your engine to constant threats—flying debris, mud, water, and impacts that can compromise critical components. The ACERBIS X-Power Kit delivers dual-sided protection for your crankcase and ignition/clutch covers, safeguarding...05052354- SKU:
- 05052354
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
$76.95 -
ACERBIS X-Power Kit - Orange - Gas Gas/Husqvarna/KTM 2979435226
ACERBIS
$76.95Dirt bikes demand protection from the constant assault of mud, rocks, and debris—especially your crankcase and ignition covers, which take the most punishment. The ACERBIS X-Power Kit shields both sides of your motor with durable, heat-resistant guards...05052356- SKU:
- 05052356
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
$76.95 -
ACERBIS X-Power Kit - Black - Yamaha 2976170001
ACERBIS
$76.95Off-road riding exposes your engine's most vulnerable components to constant punishment from impacts, flying debris, and mud buildup. The ACERBIS X-Power Kit shields your crankcase, clutch cover, and ignition cover from damage that can compromise...05052357- SKU:
- 05052357
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
$76.95 -
Rekluse Clutch Cover Yamaha YZ450F 2023-2025 RMS-0407176
REKLUSE
$229.00Stock clutch covers are vulnerable to impact damage on technical terrain, leaving your engine exposed and your cooling compromised. The Rekluse billet aluminum clutch cover delivers the protection and oil capacity your YZ450F needs for aggressive riding,...09402115- SKU:
- 09402115
- Availability:
- Ships Same Business Day
- Weight:
- 0.93 LBS
$229.00 -
MOOSE RACING Gasket Material - Green - 2 Pack - .032" 403-5011
MOOSE RACING
$34.29Custom gasket material is essential for sealed, leak-free engine and drivetrain assemblies—especially when OEM gaskets don't fit your application or you need to fabricate custom seals for modified components. The MOOSE RACING green gasket material...09347527- SKU:
- 09347527
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
$34.29 -
Hinson Racing Clutch Cover Yamaha YZ450F 2023-2024 C616-2301
HINSON RACING
$189.99Sustained heat buildup in the clutch case compromises engagement reliability and component lifespan—especially under the demands of competitive riding. This Hinson Racing clutch cover addresses thermal management directly with precision engineering and...09402114- SKU:
- 09402114
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
$189.99 -
Wossner 55 mm Piston Kit for Yamaha YZ125 2022-2025 8321D100
WOSSNER
$132.00When you're pushing a YZ125 to its limits, a worn or damaged piston compromises both power delivery and engine reliability. The Wossner 55 mm Piston Kit delivers the precision fit and aerospace-grade construction you need to restore full performance or...09106617- SKU:
- 09106617
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
$132.00 -
Wossner Piston Kit 55.95 mm Yamaha YZ125 2022-2025 8321D200
WOSSNER
$152.00Stock pistons wear quickly under racing conditions, compromising compression and throttle response. The Wossner 55.95 mm kit restores factory specifications with aerospace-grade materials and precision engineering, delivering reliable power across your...09106618- SKU:
- 09106618
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
$152.00 -
Wossner Piston Kit 57.95mm Yamaha YZ125 2022-2023 8321D400
WOSSNER
$152.00Stock pistons can't handle the demands of serious riding—especially in a high-revving 2-stroke like the YZ125. This Wossner kit delivers the precision engineering and durability you need to maintain peak performance lap after lap, with reduced friction...09106619- SKU:
- 09106619
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
$152.00 -
Wossner Piston Kit 71.94mm KTM 300 EXC 2006-2024 8327DA
WOSSNER
$192.00When you're pushing your KTM 300 EXC to its limits, a worn or stock piston becomes a bottleneck to performance and reliability. The Wossner 71.94mm Piston Kit delivers measurable gains in power delivery and durability through aerospace-grade construction...09106620- SKU:
- 09106620
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
$192.00 -
Wossner Piston Kit 71.95mm KTM 300 EXC 2023 8327DB
WOSSNER
$192.00If you're running a KTM 300 EXC, piston wear directly impacts throttle response, compression consistency, and overall engine longevity. This Wossner kit replaces worn components with aerospace-grade construction and a friction-reducing skirt coating,...09106621- SKU:
- 09106621
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
$192.00 -
Wossner Piston Kit 71.96mm Husqvarna TE 300i 2018-2023 8327DC
WOSSNER
$192.00A worn or damaged piston directly compromises combustion efficiency, throttle response, and engine longevity. The Wossner 71.96mm piston kit restores your Husqvarna TE 300i to factory performance specifications while reducing friction losses and...09106622- SKU:
- 09106622
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
$192.00 -
Wossner Piston Kit 46.95 mm KTM 85 SX 2003-2025 8328DA
WOSSNER
$132.00Your KTM 85 SX demands a piston that can handle aggressive riding without sacrificing reliability—this Wossner kit delivers both. Factory-spec dimensions and aerospace-grade construction ensure your engine maintains peak performance across the entire RPM...09106623- SKU:
- 09106623
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
$132.00 -
Wossner Piston Kit 46.96mm KTM 85 SX 2003-2025 8328DB
WOSSNER
$132.00If you're running a KTM 85 SX, piston wear is inevitable—and it directly impacts compression, throttle response, and engine longevity. The Wössner 8328DB kit replaces your worn piston with a precision-engineered unit that restores lost performance while...09106624- SKU:
- 09106624
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
$132.00 -
Wossner Piston Kit 46.97mm KTM 85 SX 17/14 2003-2025 8328DC
WOSSNER
$132.00The Wossner 46.97mm piston kit is engineered for KTM 85 SX riders who demand reliable top-end performance without compromise. This complete assembly eliminates guesswork by pairing a precision-forged piston with OEM-spec rings, pins, and...09106625- SKU:
- 09106625
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
$132.00 -
Wossner 47.45mm Piston Kit for Yamaha YZ85 2002-2025 8330DA
WOSSNER
$122.00The Wossner 47.45mm Piston Kit delivers the reliability and precision your Yamaha YZ85 demands, whether you're preparing for competition or pushing through demanding trail conditions. Factory OEM pistons wear faster and sacrifice performance under...09106626- SKU:
- 09106626
- Availability:
- Ships Same Business Day
- Weight:
- 0.33 LBS
$122.00 -
Wossner Piston Kit 47.46mm Yamaha YZ85 2002-2025 8330DB
WOSSNER
$122.00Stock pistons wear out—especially in high-revving two-strokes like the YZ85. This Wossner piston kit delivers the precision fit and durability you need to maintain peak performance across the full 2002-2025 model range, while reducing friction and noise...09106627- SKU:
- 09106627
- Availability:
- Ships Same Business Day
- Weight:
- 0.33 LBS
$122.00 -
Wossner Piston Kit 47.47mm Yamaha YZ85 2002-2025 8330DC
WOSSNER
$122.00A worn or damaged piston directly undermines engine efficiency, reliability, and rideability—especially critical in the demanding environment of two-stroke racing. The Wossner 47.47mm Piston Kit delivers OEM-equivalent fitment with measurable...09106628- SKU:
- 09106628
- Availability:
- Ships Same Business Day
- Weight:
- 0.37 LBS
$122.00 -
Wossner Piston Kit 73mm Bore Beta RR 300 2022-2024 8324DA
WOSSNER
$192.00High-mileage and modified Beta RR 300 engines demand pistons engineered for reliability and consistent performance under sustained load. This Wössner piston kit delivers OEM-quality fitment with aerospace-grade materials and a permanent skirt coating...09106629- SKU:
- 09106629
- Availability:
- Ships Same Business Day
- Weight:
- 0.88 LBS
$192.00
