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
-
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 34.4336
PROX
MSRP: $149.95Now: $127.00Was: $149.95A complete gasket kit is essential for any engine rebuild or top-end refresh—it ensures a proper seal across all critical engine surfaces and prevents oil leaks, coolant seepage, and combustion...09345605- SKU:
- 09345605
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $149.95Now: $127.00Was: $149.95Qty in Cart: 0Quantity:Price:MSRP: $149.95Now: $127.00Was: $149.95Subtotal: -
On Sale
PROX Gasket Kit - Complete - Kawasaki 34.4409
PROX
MSRP: $115.95Now: $93.00Was: $115.95A complete gasket kit is essential for any engine rebuild or top-end service—it ensures a proper seal across all critical surfaces and prevents costly oil and coolant leaks that can compromise engine...09345608- SKU:
- 09345608
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $115.95Now: $93.00Was: $115.95Qty in Cart: 0Quantity:Price:MSRP: $115.95Now: $93.00Was: $115.95Subtotal: -
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 34.6011
PROX
MSRP: $49.95Now: $42.00Was: $49.95A complete gasket kit is essential for any engine rebuild or top-end service on your KTM—it ensures a proper seal across all critical junctures, preventing oil leaks and combustion blowby that...09345611- SKU:
- 09345611
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $49.95Now: $42.00Was: $49.95Qty in Cart: 0Quantity:Price:MSRP: $49.95Now: $42.00Was: $49.95Subtotal: -
On Sale
PROX Gasket Kit - Complete - KTM 34.6018
PROX
MSRP: $94.95Now: $81.00Was: $94.95A complete gasket kit is essential for any KTM engine rebuild or major service—it ensures a proper seal across all critical engine surfaces and eliminates the guesswork of sourcing individual gaskets...09345613- SKU:
- 09345613
- 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: $94.95Now: $81.00Was: $94.95Qty in Cart: 0Quantity:Price:MSRP: $94.95Now: $81.00Was: $94.95Subtotal: -
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 34.6222
PROX
MSRP: $99.95Now: $81.00Was: $99.95A complete gasket kit is essential maintenance for any KTM engine—it seals critical combustion chambers and prevents oil seepage that compromises performance and reliability. Whether you're...09345619- SKU:
- 09345619
- 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: $99.95Now: $81.00Was: $99.95Qty in Cart: 0Quantity:Price:MSRP: $99.95Now: $81.00Was: $99.95Subtotal: -
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: $130.95Qty in Cart: 0Quantity:Price:MSRP: $130.95Now: $106.00Was: $130.95Subtotal: -
On Sale
PROX Gasket Kit - Complete - KTM 34.6320
PROX
MSRP: $94.95Now: $81.00Was: $94.95A complete gasket kit is essential for any engine rebuild or top-end refresh—it ensures proper sealing across all critical junctions and prevents oil leaks, coolant seepage, and combustion gas bypass...09345625- SKU:
- 09345625
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
MSRP: $94.95Now: $81.00Was: $94.95Qty in Cart: 0Quantity:Price:MSRP: $94.95Now: $81.00Was: $94.95Subtotal: -
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: $120.95Qty in Cart: 0Quantity:Price:MSRP: $120.95Now: $98.00Was: $120.95Subtotal: -
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 Gasket Kit - Complete - KTM 34.6512
PROX
MSRP: $172.95Now: $140.00Was: $172.95A complete gasket kit is essential for any engine rebuild or top-end refresh—it ensures proper sealing across all critical junctures and prevents oil leakage, coolant seepage, and combustion gas...09345647- SKU:
- 09345647
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
MSRP: $172.95Now: $140.00Was: $172.95 -
On Sale
PROX Gasket Kit - Complete - KTM 34.6520
PROX
MSRP: $214.95Now: $183.00Was: $214.95A complete gasket kit is essential for any engine rebuild or top-end service on your KTM—it ensures a proper seal across all critical combustion chamber interfaces and prevents oil leakage that...09345648- SKU:
- 09345648
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- COMPLETE
MSRP: $214.95Now: $183.00Was: $214.95Qty in Cart: 0Quantity:Price:MSRP: $214.95Now: $183.00Was: $214.95Subtotal: -
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 -
On Sale
PROX Top End Gasket Set - Honda 35.1112
PROX
MSRP: $25.95Now: $21.00Was: $25.95A compromised top end gasket set is one of the fastest ways to lose compression, leak oil, and invite catastrophic engine failure. PROX's top end gasket set for Honda applications delivers...09345652- SKU:
- 09345652
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
MSRP: $25.95Now: $21.00Was: $25.95 -
On Sale
PROX Top End Gasket Set - Honda 35.1113
PROX
MSRP: $25.95Now: $21.00Was: $25.95A quality top end gasket set is fundamental to maintaining cylinder head integrity and preventing oil and coolant leaks that compromise engine reliability. PROX's 35.1113 gasket set delivers...09345653- SKU:
- 09345653
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET SET
- UNITS:
- SET
MSRP: $25.95Now: $21.00Was: $25.95 -
On Sale
PROX Top End Gasket Set - Honda 35.1115
PROX
MSRP: $25.95Now: $21.00Was: $25.95A compromised top end gasket set will leak oil, reduce compression, and compromise engine reliability—especially critical if you're pushing your Honda to the limit on track or street. PROX's 35.1115...09345654- SKU:
- 09345654
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
MSRP: $25.95Now: $21.00Was: $25.95
