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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On Sale
PROX Gasket Kit - Complete - Yamaha 34.2418
PROX
MSRP: $139.95Now: $119.00Was: $139.95A complete gasket kit is essential insurance against mid-race failures and costly engine rebuilds. PROX delivers factory-spec gasket sets engineered to maintain compression integrity and prevent oil...09345561- SKU:
- 09345561
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- RIDING STYLE:
- STREET
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $139.95Now: $119.00Was: $139.95 -
On Sale
PROX Gasket Kit - Complete - Yamaha 34.2420
PROX
MSRP: $139.95Now: $119.00Was: $139.95A complete gasket kit is essential maintenance for any serious engine build or rebuild—worn gaskets lead to compression loss, oil seepage, and potential catastrophic failure. The PROX Gasket Kit for...09345562- SKU:
- 09345562
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
- PRODUCT NAME:
- GASKET KIT
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $139.95Now: $119.00Was: $139.95 -
On Sale
PROX Gasket Kit - Complete - Yamaha 34.2426
PROX
MSRP: $199.95Now: $161.00Was: $199.95A complete gasket kit is essential for any engine rebuild or top-end service—it ensures proper sealing across all critical joints, preventing oil leaks and combustion gas escape that compromise...09345565- SKU:
- 09345565
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
MSRP: $199.95Now: $161.00Was: $199.95 -
On Sale
PROX Gasket Kit - Complete - Suzuki 34.3218
PROX
MSRP: $115.95Now: $93.00Was: $115.95A complete gasket kit is essential for any engine rebuild or top-end overhaul, ensuring proper sealing across all critical surfaces and preventing oil and coolant leaks that compromise performance...09345571- SKU:
- 09345571
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- PRODUCT NAME:
- GASKET KIT
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $115.95Now: $93.00Was: $115.95 -
On Sale
PROX Gasket Kit - Complete - Suzuki 34.3221
PROX
MSRP: $115.95Now: $93.00Was: $115.95A complete gasket kit is essential insurance for any engine rebuild or top-end refresh—it eliminates the guesswork of sourcing individual gaskets and ensures every sealing surface meets OEM...09345572- SKU:
- 09345572
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
MSRP: $115.95Now: $93.00Was: $115.95 -
On Sale
PROX Gasket Kit - Complete - Suzuki 34.3224
PROX
MSRP: $109.95Now: $93.00Was: $109.95A complete gasket kit is essential maintenance for preserving engine integrity and preventing costly oil and coolant leaks that compromise performance and reliability. PROX's complete gasket set...09345573- SKU:
- 09345573
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET KIT
MSRP: $109.95Now: $93.00Was: $109.95 -
On Sale
PROX Gasket Kit - Complete - Suzuki 34.3409
PROX
MSRP: $193.95Now: $157.00Was: $193.95A complete gasket kit is the foundation of a reliable engine rebuild—seal degradation leads to oil leaks, compression loss, and potential catastrophic failure. The PROX Gasket Kit for Suzuki...09345585- SKU:
- 09345585
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
MSRP: $193.95Now: $157.00Was: $193.95 -
On Sale
PROX Gasket Kit - Complete - Suzuki 34.3420
PROX
MSRP: $141.95Now: $115.00Was: $141.95A complete gasket kit is essential for any engine rebuild or head gasket replacement, as it ensures proper sealing across all critical surfaces and prevents oil, coolant, and combustion leakage. The...09345586- SKU:
- 09345586
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $141.95Now: $115.00Was: $141.95 -
On Sale
PROX Gasket Kit - Complete - Kawasaki 34.4121
PROX
MSRP: $72.95Now: $59.00Was: $72.95A complete gasket kit is essential for any engine rebuild or top-end service—it eliminates the guesswork of sourcing individual gaskets and seals, ensuring proper sealing across all critical engine...09345592- SKU:
- 09345592
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $72.95Now: $59.00Was: $72.95 -
On Sale
PROX Gasket Kit - Complete - Kawasaki 34.4221
PROX
MSRP: $105.95Now: $85.00Was: $105.95A complete gasket kit is the foundation of engine reliability—sealing surfaces that prevent oil leaks, coolant loss, and combustion blow-by that compromise performance and longevity. PROX's complete...09345598- SKU:
- 09345598
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $105.95Now: $85.00Was: $105.95 -
On Sale
PROX Gasket Kit - Complete - Kawasaki 34.4313
PROX
MSRP: $109.95Now: $89.00Was: $109.95A complete gasket kit is essential maintenance for any serious Kawasaki engine builder or race mechanic. Worn or degraded gaskets lead to fluid leaks, compression loss, and potential catastrophic...09345602- SKU:
- 09345602
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $109.95Now: $89.00Was: $109.95 -
On Sale
PROX Gasket Kit - Complete - Kawasaki 34.4334
PROX
MSRP: $159.95Now: $136.00Was: $159.95A complete gasket kit is essential for any engine rebuild or major service—it ensures a reliable, leak-free seal across all critical engine surfaces. PROX's Kawasaki-specific gasket kit eliminates...09345604- SKU:
- 09345604
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- GASKET KIT
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $159.95Now: $136.00Was: $159.95 -
On Sale
PROX Gasket Kit - Complete - Kawasaki 34.4419
PROX
MSRP: $205.95Now: $166.00Was: $205.95A complete gasket kit is essential for any engine rebuild or top-end refresh—it ensures proper sealing across all critical combustion chamber surfaces and prevents oil weeping at assembly joints...09345610- SKU:
- 09345610
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
MSRP: $205.95Now: $166.00Was: $205.95 -
On Sale
PROX Gasket Kit - Complete - KTM 34.6218
PROX
MSRP: $94.95Now: $81.00Was: $94.95A complete gasket kit is essential for any engine rebuild or top-end service on your KTM—it ensures proper sealing across all critical engine surfaces and prevents oil leaks, coolant seepage, and...09345618- SKU:
- 09345618
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $94.95Now: $81.00Was: $94.95 -
On Sale
PROX Gasket Kit - Complete - KTM 34.6227
PROX
MSRP: $130.95Now: $106.00Was: $130.95A complete gasket kit is essential for any engine rebuild or top-end overhaul—it ensures proper sealing across all critical engine surfaces and prevents oil leaks that compromise performance and...09345620- SKU:
- 09345620
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
MSRP: $130.95Now: $106.00Was: $130.95 -
On Sale
PROX Gasket Kit - Complete - KTM 34.6327
PROX
MSRP: $120.95Now: $98.00Was: $120.95A complete gasket kit is essential for maintaining proper sealing integrity across your KTM engine—preventing oil leaks, coolant seepage, and compression loss that compromise performance and...09345629- SKU:
- 09345629
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $120.95Now: $98.00Was: $120.95 -
On Sale
PROX Gasket Kit - Complete - KTM 34.6328
PROX
MSRP: $124.95Now: $106.00Was: $124.95A complete gasket kit is essential for any KTM engine rebuild or top-end service, ensuring proper sealing across all critical junctions and preventing fluid leakage that compromises performance and...09345630- SKU:
- 09345630
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
MSRP: $124.95Now: $106.00Was: $124.95 -
On Sale
PROX Gasket Kit - Complete - KTM 34.6348
PROX
MSRP: $99.95Now: $81.00Was: $99.95A complete gasket kit is essential maintenance for any KTM engine rebuild or top-end refresh. Worn or degraded gaskets lead to compression loss, oil seepage, and potential catastrophic engine failure...09345637- SKU:
- 09345637
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
MSRP: $99.95Now: $81.00Was: $99.95 -
On Sale
PROX Gasket Kit - Complete - KTM 34.6420
PROX
MSRP: $214.95Now: $183.00Was: $214.95A complete gasket kit is essential for any engine rebuild or top-end service on your KTM, ensuring proper sealing across all critical engine interfaces. Using OEM-equivalent gaskets prevents...09345641- SKU:
- 09345641
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
MSRP: $214.95Now: $183.00Was: $214.95 -
On Sale
PROX Top End Gasket Set - Honda 35.1070
PROX
MSRP: $25.95Now: $21.00Was: $25.95A properly sealed top end is non-negotiable for consistent power delivery and engine longevity. The PROX Top End Gasket Set delivers OEM-equivalent sealing without the premium price tag, making it...09345650- SKU:
- 09345650
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- SET
MSRP: $25.95Now: $21.00Was: $25.95
