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 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 plastic with a protective T6061-T6 aluminum design,...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 MOOSE Racing Cobra 65 piston kit delivers the durability...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 aluminum alloy construction with 18% silicon resists...09106549- SKU:
- 09106549
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
$206.95 -
MOOSE RACING Wrist Pin - Cobra MSE715035
MOOSE RACING
$1.95A wrist pin failure mid-race means a seized engine and a DNF. The MOOSE Racing Cobra MSE715035 wrist pin delivers the precision fit and wear resistance you need to keep your piston assembly reliable through thousands of combustion cycles. Built with...09130306- SKU:
- 09130306
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$1.95Qty in Cart: 0Quantity:Price:$1.95Subtotal: -
MOOSE RACING Circlip - Cobra MSE72025K
MOOSE RACING
$2.95A circlip is a critical retention component in high-performance engine and drivetrain assemblies, ensuring that internal components stay precisely positioned under extreme loads and RPM conditions. The MOOSE Racing Cobra MSE72025K is engineered to OEM...09130308- SKU:
- 09130308
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$2.95 -
MOOSE RACING Piston Kit - 44.95 mm - Cobra 65 MSE24107AB
MOOSE RACING
$68.95A piston kit is the heart of your engine's combustion cycle—precision-engineered components that directly impact horsepower, reliability, and longevity. The MOOSE Racing Piston Kit for Cobra 65 delivers gravity-cast construction with advanced coatings...09106547- SKU:
- 09106547
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
$68.95 -
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 efficiency without sacrificing longevity. The...09106550- SKU:
- 09106550
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
$147.95 -
MOOSE RACING Piston Ring - For 72.96 mm Piston MSE530100007300
MOOSE RACING
$36.95A quality piston ring is critical to maintaining proper compression and oil control in your engine—two factors that directly impact power delivery and engine longevity. MOOSE Racing piston rings are engineered to OEM specifications with wear-resistant...09120939- SKU:
- 09120939
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$36.95 -
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 with enhanced durability through nitride or chrome...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 OEM-compatible performance with wear-resistant construction,...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 kit restores factory-spec integrity to your fuel...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 conditions, reducing the risk of costly internal damage...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 Honda specifications and manufactured to OEM tolerances,...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 specifications, providing a dependable seal that withstands...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 around the ignition cover, this OEM-equivalent gasket...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 the clutch cover, preventing fluid loss and...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 RACING Throttle Body Guard shields all electrical...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 MOOSE RACING Ignition Wire Guard shields your ignition...09500997- SKU:
- 09500997
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$29.95 -
On Sale
ATHENA Top End Gasket Kit - Honda P400210600323
ATHENA
MSRP: $65.95Now: $59.00Was: $65.95Whether you're prepping for race day or executing a midseason engine refresh, compression ratio optimization is critical to extracting maximum performance from your Honda. The ATHENA Top End Gasket Kit gives you the flexibility to tune your engine's...09347377- SKU:
- 09347377
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $65.95Now: $59.00Was: $65.95 -
On Sale
ATHENA Complete Gasket Kit - Honda P400210900322
ATHENA
MSRP: $212.95Now: $192.00Was: $212.95A complete gasket kit is the foundation of a reliable engine rebuild—failed gaskets lead to coolant leaks, oil seepage, and catastrophic engine damage. The ATHENA P400210900322 combines precision engineering with high-temperature durability, ensuring...09347472- SKU:
- 09347472
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
MSRP: $212.95Now: $192.00Was: $212.95
