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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On Sale
VINTCO Engine Gasket Kit - Suzuki KEG070
VINTCO
MSRP: $49.95Now: $46.45Was: $49.95A failed gasket can compromise engine integrity and lead to costly leaks that threaten your build. The VINTCO Engine Gasket Kit gives you OEM-equivalent sealing performance across all critical...09347334- SKU:
- 09347334
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
MSRP: $49.95Now: $46.45Was: $49.95Qty in Cart: 0Quantity:Price:MSRP: $49.95Now: $46.45Was: $49.95Subtotal: -
MOOSE RACING Piston Kit - 77.00 mm - Yamaha MPX1099
MOOSE RACING
$386.95A quality piston kit is foundational to engine reliability and performance—especially when you're pushing your Yamaha to its limits. The MOOSE Racing MPX1099 delivers the durability and efficiency...09106516- SKU:
- 09106516
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
$386.95Qty in Cart: 0Quantity:Price:$386.95Subtotal: -
On Sale
ATHENA Piston Kit with Gaskets - 76.76 mm - CRF250R P5F0768245002B
ATHENA
MSRP: $203.95Now: $184.00Was: $203.95Stock pistons wear down and lose compression over time, robbing your CRF250R of throttle response and top-end power. This Athena piston kit restores OEM reliability while delivering the durability...09031703- SKU:
- 09031703
- Availability:
- Ships Same Business Day
- Weight:
- 1.08 LBS
MSRP: $203.95Now: $184.00Was: $203.95Qty in Cart: 0Quantity:Price:MSRP: $203.95Now: $184.00Was: $203.95Subtotal: -
On Sale
ATHENA Piston Kit with Gaskets - 76.96 mm - WR/YZ250F P5F0770039007A
ATHENA
MSRP: $222.95Now: $201.00Was: $222.95If you're pushing your WR/YZ250F to its limits, your stock piston won't cut it. This ATHENA piston kit delivers the precision engineering and durability needed for aggressive off-road riding, whether...09031706- SKU:
- 09031706
- Availability:
- Ships Same Business Day
- Weight:
- 1.17 LBS
MSRP: $222.95Now: $201.00Was: $222.95Qty in Cart: 0Quantity:Price:MSRP: $222.95Now: $201.00Was: $222.95Subtotal: -
On Sale
ATHENA Piston Kit with Gaskets - 77.96 mm - EC250F | FE250 | 250EXCF P5F0780093001B
ATHENA
MSRP: $217.95Now: $196.00Was: $217.95When your 4-stroke off-road engine is pushed to its limits, a worn or substandard piston compromises compression, throttle response, and overall reliability. The ATHENA Piston Kit delivers...09031727- SKU:
- 09031727
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
MSRP: $217.95Now: $196.00Was: $217.95Qty in Cart: 0Quantity:Price:MSRP: $217.95Now: $196.00Was: $217.95Subtotal: -
On Sale
ATHENA Piston Kit with Gaskets - 78.95 mm - CRF250R/RX P5F0790319001A
ATHENA
MSRP: $212.95Now: $192.00Was: $212.95The ATHENA Piston Kit delivers OEM-level reliability with measurably superior durability and performance for your CRF250R/RX. CNC-machined from high-silicon aluminum alloy, this piston reduces...09031728- SKU:
- 09031728
- Availability:
- Ships Same Business Day
- Weight:
- 1.21 LBS
MSRP: $212.95Now: $192.00Was: $212.95Qty in Cart: 0Quantity:Price:MSRP: $212.95Now: $192.00Was: $212.95Subtotal: -
On Sale
Wiseco Piston Kit 95.00 mm 12.75:1 Compression Ratio for 2014-2022 Husqvarna FC450 40297M09500
WISECO
MSRP: $288.95Now: $217.00Was: $288.95When you're pushing your FC450 to its limits, stock pistons won't cut it. This Wiseco forged piston kit delivers the strength, precision tolerances, and reliability demanded by serious 4-stroke...09106542- SKU:
- 09106542
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
MSRP: $288.95Now: $217.00Was: $288.95 -
JE PISTONS Piston Kit 362953
JE PISTONS
$314.99When you're running professional-grade power, your pistons need to match that commitment. The JE PISTONS 362953 kit is engineered for extreme applications where reliability and performance aren't...09106543- SKU:
- 09106543
- Availability:
- Ships Same Business Day
- Weight:
- 0.74 LBS
$314.99 -
MOOSE RACING Piston Kit - 96.00 mm - Suzuki MP3020
MOOSE RACING
$326.95A quality piston kit is fundamental to reliable top-end performance, and this MOOSE Racing unit delivers the precision and durability that serious builders demand. The X-style forging process...09106469- SKU:
- 09106469
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
$326.95Qty in Cart: 0Quantity:Price:$326.95Subtotal: -
MOOSE RACING Piston Kit - 77.00 mm - Yamaha MP1034C
MOOSE RACING
$125.95A worn or compromised piston directly limits your engine's ability to maintain compression, power output, and reliability—especially under forced induction or high-RPM racing conditions. The MOOSE...09106472- SKU:
- 09106472
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
$125.95Qty in Cart: 0Quantity:Price:$125.95Subtotal: -
MOOSE RACING Piston Kit - 95.00 mm - Yamaha MP1011
MOOSE RACING
$125.95If you're pushing your Yamaha MP1011 engine to its limits, stock pistons won't cut it. The MOOSE RACING Piston Kit delivers the strength, precision, and durability required for sustained...09106473- SKU:
- 09106473
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
$125.95Qty in Cart: 0Quantity:Price:$125.95Subtotal: -
MOOSE RACING Piston Kit - 97.00 mm - Can-Am MP9014
MOOSE RACING
$125.95A worn or damaged piston directly undermines engine efficiency, responsiveness, and longevity. The MOOSE RACING Piston Kit delivers OEM-quality reliability with forged construction designed to handle...09106478- SKU:
- 09106478
- Availability:
- Ships Same Business Day
- Weight:
- 1.26 LBS
$125.95Qty in Cart: 0Quantity:Price:$125.95Subtotal: -
MOOSE RACING Piston Kit - 72.96 mm - Xtrainer 300 MSE24569B
MOOSE RACING
$218.95A piston kit is the heart of your engine's combustion cycle—when it fails or wears, your power output and reliability suffer. The MOOSE Racing 72.96 mm Piston Kit delivers OEM-quality construction...09106545- SKU:
- 09106545
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
$218.95Qty in Cart: 0Quantity:Price:$218.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - Honda P400210900323
ATHENA
MSRP: $205.95Now: $176.00Was: $205.95A complete gasket kit is essential for any engine rebuild—it ensures proper sealing across all critical surfaces and prevents compression loss, oil leakage, and coolant bypass that can compromise...09347376- SKU:
- 09347376
- Availability:
- Ships Same Business Day
- Weight:
- 0.62 LBS
MSRP: $205.95Now: $176.00Was: $205.95Qty in Cart: 0Quantity:Price:MSRP: $205.95Now: $176.00Was: $205.95Subtotal: -
On Sale
ATHENA Top End Gasket Kit - Suzuki P400510600099
ATHENA
MSRP: $72.95Now: $66.00Was: $72.95Engine gaskets are critical sealing components that degrade with heat cycles and wear, directly impacting compression integrity and power output. The ATHENA Top End Gasket Kit gives you the...09347508- SKU:
- 09347508
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
MSRP: $72.95Now: $66.00Was: $72.95Qty in Cart: 0Quantity:Price:MSRP: $72.95Now: $66.00Was: $72.95Subtotal: -
Cylinder Works Big Bore Gasket Kit 80mm Bore Yamaha YZ250F 2019 CW21013G01
CYLINDER WORKS
$101.95A worn or damaged top-end gasket kit compromises combustion chamber sealing, leading to compression loss and reduced power output. The Cylinder Works Big Bore Gasket Kit ensures a precision fit for...09347521- SKU:
- 09347521
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$101.95Qty in Cart: 0Quantity:Price:$101.95Subtotal: -
On Sale
Wossner Piston Kit 72.96mm Beta 300 RR 2022-2026 8324DB
WOSSNER
MSRP: $192.00Now: $182.40Was: $192.00OEM pistons wear out, but a quality replacement kit restores lost compression and throttle response while preventing catastrophic engine failure. The Wossner 72.96mm piston kit for your Beta 300 RR...09106630- SKU:
- 09106630
- Availability:
- Ships Same Business Day
- Weight:
- 0.87 LBS
MSRP: $192.00Now: $182.40Was: $192.00 -
On Sale
Wossner Connecting Rod Kit Yamaha YZ65 2018-2025 P2071
WOSSNER
MSRP: $112.00Now: $106.40Was: $112.00A connecting rod is mission-critical for any high-revving engine—it's the link between combustion force and crankshaft rotation, and failure means catastrophic engine damage. The Wossner P2071 is...09230683- SKU:
- 09230683
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $112.00Now: $106.40Was: $112.00 -
PROX Connecting Rod Kit - Kawasaki 03.4351
PROX
$232.95A connecting rod failure at high RPM doesn't just end your day—it ends your engine. The PROX Connecting Rod Kit for Kawasaki engines is engineered to OEM specifications with double-forged...09230698- SKU:
- 09230698
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
$232.95 -
PROX Connecting Rod Kit - Gas Gas | Husqvarna | KTM 03.6337
PROX
$232.95A connecting rod is the critical link between your piston and crankshaft—when it fails, your engine fails. The PROX 03.6337 kit uses double-forged construction with optimized grain flow to deliver...09230700- SKU:
- 09230700
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
$232.95
