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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MOOSE RACING Water Pump Cover - Black - KTM I04-5260B
MOOSE RACING
$99.95Stock water pump covers crack under thermal stress and vibration, leaving your cooling system vulnerable to failure during peak performance runs. This billet aluminum replacement delivers the...09402048- SKU:
- 09402048
- Availability:
- Ships Same Business Day
- Weight:
- 0.37 LBS
$99.95 -
MOOSE RACING Ignition Wire Guard - Gas Gas/Husqvarna/KTM 27-1017
MOOSE RACING
$29.95Exposed ignition wires are vulnerable to puncture, abrasion, and debris damage—failures that can leave you stranded. The MOOSE RACING Ignition Wire Guard (27-1017) provides direct protection where it...09500996- SKU:
- 09500996
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$29.95 -
MOOSE RACING Wrist Pin - KTM MSE715389
MOOSE RACING
$11.71A wrist pin is the critical link between your piston and connecting rod—any wear or play here directly compromises engine reliability and performance. The MOOSE Racing wrist pin for KTM delivers a...09130184- SKU:
- 09130184
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
$11.71 -
MOOSE RACING Ignition Wire Guard - Gas Gas/Husqvarna/KTM 27-1223
MOOSE RACING
$29.95Exposed ignition wires are vulnerable to debris, abrasion, and environmental damage—problems that can leave you stranded or force costly repairs. The MOOSE RACING Ignition Wire Guard shields your...09500998- SKU:
- 09500998
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$29.95 -
MOOSE RACING Water Pump Guard Cover - Gas Gas/KTM/Husqvarna 27-1016
MOOSE RACING
$42.95Dirt bike racing puts your water pump in the line of fire—literally. Rocks, logs, and trail debris can crack the pump housing or sever radiator hose connections, leaving you stranded mid-ride or...09320298- SKU:
- 09320298
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
$42.95 -
MOOSE RACING Water Pump Guard Cover - Gas Gas/Husqvarna/KTM 27-1423
MOOSE RACING
$42.95Off-road riding exposes your water pump to constant abuse from rocks, logs, and trail debris—damage that can lead to coolant leaks and catastrophic engine failure. The MOOSE RACING Water Pump Guard...09320299- SKU:
- 09320299
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
$42.95 -
MOOSE RACING TPS Cover - Gas Gas/Husqvarna/KTM T21-5801B
MOOSE RACING
$39.95The throttle position sensor is a critical component that directly affects throttle response and engine management on 2-stroke dirt bikes. Moose Racing's aluminum TPS cover replaces the fragile OEM...09402047- SKU:
- 09402047
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
$39.95 -
MOOSE RACING Piston Kit - 42.95 mm - Cobra 65 MSE24106AB
MOOSE RACING
$68.95A piston kit is critical to engine reliability and performance—it's the component that directly translates combustion energy into power while withstanding extreme temperatures and pressures. The...09106548- SKU:
- 09106548
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
$68.95 -
MOOSE RACING Piston Kit - 57.95 mm - TXC-W 150 MSE24519B
MOOSE RACING
$206.95A piston kit is the heart of two-stroke engine reliability, and this MOOSE Racing unit delivers the durability you need for consistent performance across demanding riding conditions. The gravity-cast...09106549- SKU:
- 09106549
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
$206.95 -
MOOSE RACING Piston Kit - 53.95 mm - YZ 125 MSE24570B
MOOSE RACING
$147.95A worn or damaged piston directly kills engine performance and reliability on your YZ 125. This MOOSE Racing Piston Kit restores compression, reduces blow-by, and ensures your top-end runs at peak...09106550- SKU:
- 09106550
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
$147.95 -
MOOSE RACING Piston Ring - For 38.95 mm Piston MSE530100039001
MOOSE RACING
$18.95Piston rings are critical wear components that directly impact engine compression, oil control, and overall performance longevity. The MOOSE RACING Piston Ring delivers OEM-compatible reliability...09120940- SKU:
- 09120940
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$18.95 -
MOOSE RACING Piston Ring - For 42.95 mm Piston MSE5301000430010
MOOSE RACING
$22.95Piston rings are critical to engine sealing and compression retention—worn or damaged rings lead to blow-by, lost power, and increased oil consumption. The MOOSE RACING piston ring delivers...09120941- SKU:
- 09120941
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$22.95 -
MOOSE RACING Seals and O-Ring Kit - Gas Gas/ Husqvarna/KTM 822347MSE
MOOSE RACING
$47.13Engine seals and o-rings are critical wear items that degrade with heat cycles and fluid exposure—compromised seals lead to oil leaks, contamination, and catastrophic engine failure. This genuine OEM...09351265- SKU:
- 09351265
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$47.13 -
MOOSE RACING Top End Gasket 8100034MSE
MOOSE RACING
$99.40A quality top-end gasket is critical to preventing oil leaks and maintaining compression integrity in your engine. MOOSE RACING's precision-engineered gasket ensures a reliable seal under high RPM...09347460- SKU:
- 09347460
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$99.40 -
MOOSE RACING Top End Gasket - Honda 8100047MSE
MOOSE RACING
$72.98A properly sealed top end is critical to maintaining compression, preventing coolant and oil weeping, and ensuring your engine performs at its peak. The MOOSE RACING Top End Gasket is engineered to...09347461- SKU:
- 09347461
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$72.98 -
MOOSE RACING Top End Gasket - Yamaha 8100060MSE
MOOSE RACING
$36.41A properly sealed top end is critical to maintaining combustion pressure, preventing oil leakage, and ensuring reliable engine performance. The MOOSE RACING Top End Gasket is engineered to OEM...09347462- SKU:
- 09347462
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$36.41 -
MOOSE RACING Outer Clutch Cover Gasket - Kawasaki 816831MSE
MOOSE RACING
$11.11A failing outer clutch cover gasket leads to oil seepage that compromises clutch performance and risks engine damage. Whether you're rebuilding your clutch assembly or addressing a persistent leak...09347465- SKU:
- 09347465
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$11.11 -
MOOSE RACING Inner Clutch Gasket - Honda 816352MSE
MOOSE RACING
$13.18A failing clutch gasket compromises both sealing integrity and clutch performance, leading to oil weeping, contamination, and premature wear. This OEM-specification gasket restores a reliable seal at...09347469- SKU:
- 09347469
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$13.18 -
MOOSE RACING Throttle Body Guard - Gas Gas/Husqvarna/KTM 27-1323
MOOSE RACING
$42.95Throttle body connectors are vulnerable to damage during aggressive riding, crashes, and maintenance—a single disconnected wire can leave you stranded or force an expensive shop visit. The MOOSE...09402104- SKU:
- 09402104
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$42.95 -
MOOSE RACING Ignition Wire Guard - Gas Gas/Husqvarna/KTM 27-1023
MOOSE RACING
$29.95Exposed ignition wires are a common failure point on off-road bikes, especially in dusty or muddy trail conditions where debris can compromise your electrical connections and leave you stranded. The...09500997- SKU:
- 09500997
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$29.95
