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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ACERBIS X-Power Kit - Blue - Husqvarna/KTM 2983230003
ACERBIS
$76.95Off-road riding exposes your engine to constant abuse—flying rocks, mud, water, and extreme heat can damage critical components like your clutch cover, water pump, and ignition system. The ACERBIS X-Power Kit provides comprehensive protection where it...09402145- SKU:
- 09402145
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- COLOR/FINISH:
- BLUE
- MATERIAL:
- PLASTIC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MODEL:
- X-POWER
- TYPE:
- SIDE COVER
- MATERIAL:
- STEEL
- PRODUCT NAME:
- X-POWER KIT
$76.95 -
ACERBIS X-Power Kit - Black - Honda CRF 2982510001
ACERBIS
$76.95Your crankcase and clutch housing face constant abuse from impact, abrasion, and debris—especially in off-road conditions. The ACERBIS X-Power Kit provides direct OEM-fitment protection engineered to absorb impacts while maintaining optimal engine...09402146- SKU:
- 09402146
- Availability:
- Ships Same Business Day
- Weight:
- 1.34 LBS
- MODEL:
- X-POWER
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- MATERIAL:
- STEEL
- PRODUCT NAME:
- X-POWER KIT
- MATERIAL:
- NYLON
- TYPE:
- SIDE COVER
$76.95 -
ACERBIS X-Power Kit - Red - Honda CRF 2982510004
ACERBIS
$76.95Your crankcase and clutch housing face constant abuse from impacts, mud, sand, and debris—damage that translates to expensive repairs and downtime. The ACERBIS X-Power Kit provides OEM-fitted protection on both sides of your Honda CRF engine, using...09402147- SKU:
- 09402147
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- MATERIAL:
- STEEL
- PRODUCT NAME:
- X-POWER KIT
- UNITS:
- KIT
- COLOR/FINISH:
- RED
- RIDING STYLE:
- STREET
- MODEL:
- X-POWER
- MATERIAL:
- NYLON
- TYPE:
- SIDE COVER
$76.95 -
ACERBIS X-Power Kit - Orange - Husqvarna/KTM 2983235226
ACERBIS
$76.95Off-road riding exposes your engine to relentless punishment—mud, sand, rocks, and extreme heat all threaten critical components like your clutch cover, water pump, and ignition system. The ACERBIS X-Power Kit delivers comprehensive protection where it...09402148- SKU:
- 09402148
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- COLOR/FINISH:
- ORANGE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- STEEL
- PRODUCT NAME:
- X-POWER KIT
- TYPE:
- SIDE COVER
- MATERIAL:
- PLASTIC
- MODEL:
- X-POWER
$76.95 -
ACERBIS X-Power Kit - Orange - Husqvarna/KTM 2981365226
ACERBIS
$76.95Dirt bikes experience relentless punishment from mud, sand, and debris—and your engine covers shouldn't be the weak link. The ACERBIS X-Power Kit delivers comprehensive protection for your clutch, water pump, and ignition systems while maintaining...09402149- SKU:
- 09402149
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- MATERIAL:
- BRASS
- PRODUCT NAME:
- X-POWER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COLOR/FINISH:
- ORANGE
- MODEL:
- X-POWER
- MATERIAL:
- NYLON
- TYPE:
- SIDE COVER
$76.95 -
ACERBIS X-Power Kit - Black - Husqvarna/KTM 2981360001
ACERBIS
$76.95If you're running a Husqvarna or KTM dirt bike, engine cover damage isn't just a cosmetic issue—it compromises protection for critical components like your clutch cover, water pump, and ignition system. The ACERBIS X-Power Kit shields these vulnerable...09402150- SKU:
- 09402150
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- BRASS
- PRODUCT NAME:
- X-POWER KIT
- MATERIAL:
- NYLON
- MODEL:
- X-POWER
- TYPE:
- SIDE COVER
- COLOR/FINISH:
- BLACK
$76.95 -
ACERBIS X-Power Kit - Blue - Husqvarna/KTM 2981360003
ACERBIS
$76.95Dirt bike racing demands engine protection that actually performs under extreme conditions. The ACERBIS X-Power Kit shields your clutch cover, water pump, lower crankcase, and ignition system from the constant barrage of mud, sand, rocks, and debris that...09402151- SKU:
- 09402151
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- MATERIAL:
- BRASS
- PRODUCT NAME:
- X-POWER KIT
- COLOR/FINISH:
- BLUE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- NYLON
- MODEL:
- X-POWER
- TYPE:
- SIDE COVER
$76.95 -
ACERBIS X-Power Kit - Orange - Husqvarna/KTM 2981475226
ACERBIS
$76.95Off-road riding subjects your engine to constant assault from mud, sand, and debris—a single uncovered section can lead to costly damage or catastrophic failure. The ACERBIS X-Power Kit provides comprehensive protection for your Husqvarna or KTM's most...09402152- SKU:
- 09402152
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- COLOR/FINISH:
- ORANGE
- RIDING STYLE:
- STREET
- MATERIAL:
- BRASS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- X-POWER KIT
- TYPE:
- SIDE COVER
- MATERIAL:
- NYLON
- MODEL:
- X-POWER
$76.95 -
ACERBIS X-Power Kit - Black - Husqvarna/KTM 2981470001
ACERBIS
$76.95Off-road riding exposes your engine to constant punishment—mud, sand, rocks, and extreme temperatures degrade unprotected components quickly. The ACERBIS X-Power Kit shields your clutch cover, water pump, lower crankcase, and ignition cover with durable,...09402153- SKU:
- 09402153
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- MATERIAL:
- BRASS
- PRODUCT NAME:
- X-POWER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- STREET
- MODEL:
- X-POWER
- MATERIAL:
- NYLON
- TYPE:
- SIDE COVER
$76.95 -
ACERBIS X-Power Kit - Blue - Husqvarna/KTM 2981470003
ACERBIS
$76.95If you're running a Husqvarna or KTM two-stroke, engine case protection isn't optional—it's essential. The ACERBIS X-Power Kit shields your clutch cover, water pump, lower crankcase, and ignition cover from the constant barrage of rocks, mud, and debris...09402154- SKU:
- 09402154
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- MODEL:
- X-POWER
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- BLUE
- UNITS:
- KIT
- MATERIAL:
- BRASS
- PRODUCT NAME:
- X-POWER KIT
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- NYLON
- TYPE:
- SIDE COVER
$76.95 -
ACERBIS X-Power Kit - Black - Yamaha YZ450F 2981870001
ACERBIS
$76.95Protect your YZ450F's most vulnerable components from the harsh realities of off-road riding. The ACERBIS X-Power Kit shields both your ignition and clutch crankcases from impacts, abrasion, and debris without compromising engine cooling or...09402156- SKU:
- 09402156
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- MATERIAL:
- NYLON
- MODEL:
- X-POWER
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BRASS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- X-POWER KIT
- TYPE:
- SIDE COVER
$76.95 -
ACERBIS X-Power Kit - Blue - Yamaha YZ450F 2981870211
ACERBIS
$76.95Dirt bike racing demands protection against the constant barrage of mud, sand, and debris—especially on your YZ450F's vulnerable crankcase components. The ACERBIS X-Power Kit shields both your ignition and clutch crankcases from impact and abrasion while...09402157- SKU:
- 09402157
- Availability:
- Ships Same Business Day
- Weight:
- 1.46 LBS
- COLOR/FINISH:
- BLUE
- MODEL:
- X-POWER
- MATERIAL:
- NYLON
- TYPE:
- SIDE COVER
- MATERIAL:
- BRASS
- PRODUCT NAME:
- X-POWER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$76.95 -
ACERBIS X-Power Kit - Black - Gas Gas/Husqvarna/KTM 2983260001
ACERBIS
$76.95When you're pushing your Gas Gas, Husqvarna, or KTM to its limits, unprotected engine covers become vulnerable to flying debris, mud, and impacts that can compromise critical components. The Acerbis X-Power Kit shields your clutch cover, water pump,...09402158- SKU:
- 09402158
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- TYPE:
- SIDE COVER
- MODEL:
- X-POWER
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- BLACK
- MATERIAL:
- PLASTIC
- UNITS:
- KIT
- MATERIAL:
- STEEL
- PRODUCT NAME:
- X-POWER KIT
- RIDING STYLE:
- OFF-ROAD
$76.95 -
ACERBIS X-Power Kit - Blue - Gas Gas/Husqvarna/KTM 2983260003
ACERBIS
$76.95Dirt bike racing demands protection that keeps up with your intensity—and the ACERBIS X-Power Kit delivers exactly that. Whether you're tackling rocky terrain, muddy trails, or high-speed desert runs, this kit shields your engine's most vulnerable...09402159- SKU:
- 09402159
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- RIDING STYLE:
- STREET
- MATERIAL:
- PLASTIC
- MODEL:
- X-POWER
- TYPE:
- SIDE COVER
- MATERIAL:
- STEEL
- PRODUCT NAME:
- X-POWER KIT
- COLOR/FINISH:
- BLUE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$76.95 -
ACERBIS X-Power Kit - Orange - Gas Gas/Husqvarna/KTM 2983265226
ACERBIS
$76.95Offroad riding exposes your engine to relentless punishment—flying rocks, mud, water, and debris that compromise critical components. The ACERBIS X-Power Kit shields your clutch cover, water pump, lower crankcase, and ignition cover with durable...09402160- SKU:
- 09402160
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- MATERIAL:
- PLASTIC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- MODEL:
- X-POWER
- TYPE:
- SIDE COVER
- COLOR/FINISH:
- ORANGE
- MATERIAL:
- STEEL
- PRODUCT NAME:
- X-POWER KIT
$76.95 -
MOOSE RACING Piston Kit MX2045
MOOSE RACING
$386.95If you're pushing your engine to the limit, your stock pistons aren't built for it. The MOOSE RACING Piston Kit MX2045 combines race-proven forging technology with advanced stress-relief engineering to deliver the durability, power, and reliability...09106482- SKU:
- 09106482
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
$386.95 -
MOOSE RACING Piston Kit MP4028
MOOSE RACING
$326.95High-performance racing demands pistons engineered for extreme conditions—and the MOOSE RACING Piston Kit MP4028 delivers the strength, durability, and power output required to dominate on the track. Built with X-style and fully-boxed race forgings,...09106485- SKU:
- 09106485
- Availability:
- Ships Same Business Day
- Weight:
- 1.41 LBS
$326.95 -
MOOSE RACING Piston Kit MPX1110
MOOSE RACING
$386.95High-performance racing demands pistons engineered to handle extreme cylinder pressures, elevated temperatures, and sustained RPM loads without compromise. The MOOSE RACING Piston Kit MPX1110 delivers the durability and power output serious racers need...09106520- SKU:
- 09106520
- Availability:
- Ships Same Business Day
- Weight:
- 1.11 LBS
$386.95 -
MOOSE RACING Piston Kit MP2017
MOOSE RACING
$326.95If you're serious about top-end performance and reliability under extreme conditions, the MOOSE RACING Piston Kit MP2017 delivers the precision engineering that separates winning builds from the rest. Built with X-style and fully boxed-style forgings,...09106474- SKU:
- 09106474
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
$326.95 -
MOOSE RACING Piston Kit MP4010A
MOOSE RACING
$326.95Whether you're chasing lap times or building a reliable high-RPM engine, piston durability and friction loss directly impact both performance and longevity. The MOOSE RACING Piston Kit MP4010A is engineered to withstand extreme combustion pressures while...09106475- SKU:
- 09106475
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
$326.95
