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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- Qty in Cart
- Quantity
- Price
- Subtotal
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MOOSE RACING Cam Chain - 82RH2015 x 126 Links MSEHC82RH2015126
MOOSE RACING
$51.95A cam chain is critical to your engine's valve timing accuracy—any slack or wear directly compromises performance, fuel efficiency, and engine longevity. The MOOSE RACING 82RH2015 x 126 Links cam chain delivers OEM-exceeding reliability with precision...09251497- SKU:
- 09251497
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
$51.95 -
MOOSE RACING Cam Chain - 92RH2010 x 114 Links MSEHC92RH2010114
MOOSE RACING
$50.95A worn or stretched cam chain compromises valve timing precision and can cascade into catastrophic engine damage. The MOOSE RACING Cam Chain 92RH2010 x 114 Links delivers OEM-equivalent performance with shot-peened construction and precision bushings...09251498- SKU:
- 09251498
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
$50.95 -
MOOSE RACING Cam Chain - 92RH2010 x 120 Links MSEHC92RH2010120
MOOSE RACING
$50.95A cam chain is critical to your engine's valve timing precision—any slack or wear compromises performance, throttle response, and reliability. The MOOSE RACING 92RH2010 delivers OEM-equivalent durability with select steel construction designed to handle...09251499- SKU:
- 09251499
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
$50.95 -
K & N Performance Oil Filter - Beta KN-631
K & N
$11.99Synthetic racing oils demand a filter engineered to match their performance characteristics—and the K&N KN-631 is purpose-built for exactly that. The uniform pleated synthetic media handles the high-flow rates of modern synthetic and synthetic-blend...07120656- SKU:
- 07120656
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
$11.99 -
On Sale
Cylinder Works Standard Bore Cylinder 77mm Yamaha YZ250F 2019 CW20013
CYLINDER WORKS
MSRP: $393.95Now: $354.56Was: $393.95Your YZ250F demands precision engineering to maintain peak performance, and a worn or damaged cylinder compromises both power delivery and reliability. This Cylinder Works 77mm standard bore is a direct bolt-on replacement that restores your bike to OEM...09311117- SKU:
- 09311117
- Availability:
- Ships Same Business Day
- Weight:
- 2.45 LBS
MSRP: $393.95Now: $354.56Was: $393.95Qty in Cart: 0Quantity:Price:MSRP: $393.95Now: $354.56Was: $393.95Subtotal: -
On Sale
Cylinder Works Standard Bore Cylinder Kit 77mm Yamaha YZ250F 2019-2022 CW20013K01
CYLINDER WORKS
MSRP: $657.95Now: $592.16Was: $657.95When your YZ250F's cylinder shows signs of wear, you're losing compression, power delivery, and reliability on the track or trail. The Cylinder Works Standard Bore Kit restores your engine to peak performance with factory-matched specifications and...09311118- SKU:
- 09311118
- Availability:
- Ships Same Business Day
- Weight:
- 2.90 LBS
MSRP: $657.95Now: $592.16Was: $657.95 -
ACERBIS X-Power Kit - Blue - Husqvarna/KTM 2977605226
ACERBIS
$67.95Off-road riding exposes your crankcase and ignition/clutch covers to constant abuse from rocks, roots, mud, and impacts that compromise both protection and longevity. The ACERBIS X-Power Kit shields these critical engine components with durable...05052351- SKU:
- 05052351
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
$67.95 -
ACERBIS X-Power Kit - Blue - Husqvarna/KTM 2977600003
ACERBIS
$67.95Protect your engine's most vulnerable components from the constant punishment of off-road riding. The ACERBIS X-Power Kit shields your crankcase, clutch cover, water pump, and ignition cover with precision-engineered guards that absorb impacts from...05052352- SKU:
- 05052352
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
$67.95 -
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
$189.00Stock 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
$189.00 -
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
$189.99Qty in Cart: 0Quantity:Price:$189.99Subtotal: -
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
