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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MOOSE RACING Snap Ring - 10 Pack - Gas Gas/Husqvarna/KTM 25-6014
MOOSE RACING
$24.95Front sprocket replacements demand precision fastening—and countershaft snap rings are easy to overlook until you need them. Keep this 10-pack of MOOSE Racing snap rings in your pit box or garage to eliminate downtime during maintenance. Individual...09351211- SKU:
- 09351211
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$24.95 -
MOOSE RACING Countershaft Washer - 10 Pack - Kawasaki/Yamaha 25-6018
MOOSE RACING
$30.95Front sprocket replacements demand precision fitment, and overlooking the countershaft washer is a costly mistake that leads to improper bearing preload and premature wear. This 10-pack from MOOSE Racing ensures you'll always have the correct washer on...09351212- SKU:
- 09351212
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
$30.95 -
MOOSE RACING Piston Kit - 77.00 mm - Kawasaki MPX3050C
MOOSE RACING
$326.95When you're pushing your Kawasaki MPX3050C to the limit, factory pistons won't cut it. MOOSE Racing delivers a fully-forged piston kit engineered to handle extreme combustion pressures while shedding unnecessary weight and heat. This is the upgrade...09106491- SKU:
- 09106491
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
$326.95 -
MOOSE RACING Piston Kit - 77.00 mm - Yamaha MPX1090C
MOOSE RACING
$386.95Stock pistons are a limiting factor in any serious build—they fail under sustained high RPM, generate excessive heat, and rob you of power. MOOSE Racing's forged piston kit delivers the durability and precision you need to push your Yamaha MPX1090C...09106494- SKU:
- 09106494
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
$386.95 -
MOOSE RACING Piston Kit - 96.00 mm - Kawasaki MPX3036
MOOSE RACING
$386.95A high-performance piston kit is critical for maintaining reliability and maximizing power output in high-RPM applications. The MOOSE RACING MPX3036 delivers the strength and precision engineering necessary to handle sustained performance demands while...09106498- SKU:
- 09106498
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
$386.95 -
MOOSE RACING Piston Kit - 78.00 mm - Husqvarna | KTM MPX9060C-P
MOOSE RACING
$471.95A piston kit is the heart of your engine's power delivery—when it fails, performance and reliability suffer dramatically. This MOOSE Racing 78mm piston kit is engineered to handle extreme combustion pressures while maintaining thermal efficiency, making...09106499- SKU:
- 09106499
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
$471.95 -
MOOSE RACING Piston Kit - 95.00 mm - Husqvarna MPX9061-P
MOOSE RACING
$471.95When you're pushing your Husqvarna to its limits, piston durability becomes non-negotiable. This MOOSE Racing kit eliminates the weak points that cause failure under sustained high RPM and combustion stress, giving you the reliability to run consistent...09106500- SKU:
- 09106500
- Availability:
- Ships Same Business Day
- Weight:
- 1.11 LBS
$471.95 -
MOOSE RACING Piston Kit - 77.00 mm - Kawasaki MPX3061
MOOSE RACING
$386.95If you're pushing your Kawasaki to the limit, a worn or marginal piston kit will cost you power, reliability, and ultimately race results. The MOOSE RACING 77.00 mm Piston Kit is engineered to withstand the demands of high-RPM racing while delivering...09106501- SKU:
- 09106501
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
$386.95 -
MOOSE RACING Piston Kit - 96.00 mm - Honda MPX2180
MOOSE RACING
$386.95If you're building or rebuilding a high-revving Honda engine, piston durability and thermal stability are non-negotiable. This MOOSE RACING kit delivers the strength and precision needed to handle sustained boost and aggressive tuning without sacrificing...09106502- SKU:
- 09106502
- Availability:
- Ships Same Business Day
- Weight:
- 1.11 LBS
$386.95 -
MOOSE RACING Piston Kit - 96.00 mm - Kawasaki MPX3030
MOOSE RACING
$386.95High-compression racing demands a piston engineered to withstand extreme pressures and temperatures without sacrificing responsiveness. The MOOSE RACING 96.00 mm Piston Kit delivers the durability and precision required for sustained performance, whether...09106503- SKU:
- 09106503
- Availability:
- Ships Same Business Day
- Weight:
- 1.21 LBS
$386.95 -
MOOSE RACING Piston Kit - 96.00 mm - Kawasaki MPX3033
MOOSE RACING
$386.95A high-performance piston kit is essential for maintaining or upgrading your Kawasaki's top-end assembly—especially if you're running increased boost, higher RPMs, or simply want to restore your engine to factory-spec reliability. The MOOSE Racing...09106504- SKU:
- 09106504
- Availability:
- Ships Same Business Day
- Weight:
- 1.11 LBS
$386.95 -
MOOSE RACING Piston Kit - 96.00 mm - Kawasaki MPX3034
MOOSE RACING
$421.95When you're pushing your Kawasaki to the limit, stock pistons become your weakest link. The MOOSE RACING Piston Kit delivers the durability and thermal stability required for sustained high-RPM operation, with engineering specifically designed to...09106505- SKU:
- 09106505
- Availability:
- Ships Same Business Day
- Weight:
- 1.11 LBS
$421.95 -
MOOSE RACING Piston Kit - 96.00 mm - Honda MPX2181B
MOOSE RACING
$421.95High-rpm stability and longevity demand pistons engineered for extreme conditions—and MOOSE Racing delivers with fully forged construction that withstands detonation while shedding unnecessary weight. This 96.00 mm kit is designed for builders who refuse...09106506- SKU:
- 09106506
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
$421.95Qty in Cart: 0Quantity:Price:$421.95Subtotal: -
MOOSE RACING Piston Kit - 79.00 mm - Honda MPX2084
MOOSE RACING
$386.95If you're building a high-revving Honda engine or refreshing worn internals, a quality piston kit is non-negotiable. The MOOSE Racing MPX2084 delivers the strength and precision necessary to handle sustained boost or aggressive naturally aspirated...09106513- SKU:
- 09106513
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
$386.95 -
MOOSE RACING Piston Kit - 79.00 mm - Honda MPX2085-P
MOOSE RACING
$516.95Honda high-performance engines demand pistons engineered to handle sustained combustion pressures and elevated RPM loads. The MOOSE RACING Piston Kit delivers the durability and thermal efficiency required for reliable power, whether you're pushing your...09106514- SKU:
- 09106514
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
$516.95 -
MOOSE RACING Piston Kit - 77.00 mm - Kawasaki MPX3062
MOOSE RACING
$386.95When you're pushing your Kawasaki to the limit, stock pistons become your limiting factor. This MOOSE Racing piston kit delivers the strength and reliability needed for sustained high-RPM performance, while the advanced coating technologies and internal...09106515- SKU:
- 09106515
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
$386.95 -
MOOSE RACING Piston Kit - 77.00 mm - Yamaha MPX1089
MOOSE RACING
$421.95If you're pushing your Yamaha to the limit, your stock piston won't cut it. This MOOSE Racing piston kit delivers the strength, reliability, and reduced friction needed to handle extreme conditions without sacrificing durability. Built with forged...09106517- SKU:
- 09106517
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
$421.95 -
Rekluse Clutch Cover Gas Gas EC 450F 2025 RMS-385
REKLUSE
$189.00The stock clutch cover on your Gas Gas EC 450F won't hold up to the punishment of serious off-road riding—inadequate oil capacity means marginal cooling under load, and OEM aluminum lacks the impact resistance you need in rocky terrain. The Rekluse...09402039- SKU:
- 09402039
- Availability:
- Ships Same Business Day
- Weight:
- 0.66 LBS
$189.00 -
On Sale
ATHENA Piston Kit with Gaskets - 76.75 mm - CRF250R P5F0768245001A
ATHENA
MSRP: $214.95Now: $193.00Was: $214.95Your CRF250R's performance ceiling is limited by factory piston tolerances and ring friction losses. The ATHENA 76.75 mm piston kit replaces worn internals with precision-engineered components that restore compression, reduce parasitic drag, and deliver...09031700- SKU:
- 09031700
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
MSRP: $214.95Now: $193.00Was: $214.95 -
On Sale
ATHENA Piston Kit with Gaskets - 76.76 mm - CRF250R P5F0768245001B
ATHENA
MSRP: $214.95Now: $193.00Was: $214.95The ATHENA Piston Kit delivers the reliability you expect from OE specifications with measurably improved durability and performance for your CRF250R. High-silicon aluminum construction combined with CNC precision manufacturing ensures consistent...09031701- SKU:
- 09031701
- Availability:
- Ships Same Business Day
- Weight:
- 1.12 LBS
MSRP: $214.95Now: $193.00Was: $214.95
