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 - Yamaha 34.2312
PROX
MSRP: $78.95Now: $64.00Was: $78.95A complete gasket kit is essential for any engine rebuild or top-end overhaul—it ensures proper sealing across all critical interfaces and prevents oil leaks, coolant seepage, and compression loss...09345553- SKU:
- 09345553
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- GASKET KIT
MSRP: $78.95Now: $64.00Was: $78.95Qty in Cart: 0Quantity:Price:MSRP: $78.95Now: $64.00Was: $78.95Subtotal: -
On Sale
PROX Gasket Kit - Complete - Yamaha 34.2317
PROX
MSRP: $78.95Now: $64.00Was: $78.95A blown or leaking gasket compromises engine seal integrity, leading to oil seepage, coolant loss, and potential internal damage—especially critical in high-performance applications where reliability...09345555- SKU:
- 09345555
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
MSRP: $78.95Now: $64.00Was: $78.95 -
On Sale
PROX Gasket Kit - Complete - Yamaha 34.2322
PROX
MSRP: $83.95Now: $68.00Was: $83.95A complete gasket kit is essential for any engine rebuild or major service on your Yamaha—it ensures a proper seal across all critical engine surfaces and prevents oil leaks, coolant seepage, and...09345557- SKU:
- 09345557
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $83.95Now: $68.00Was: $83.95 -
On Sale
PROX Gasket Kit - Complete - Yamaha 34.2401
PROX
MSRP: $147.95Now: $119.00Was: $147.95A complete gasket kit is essential for any engine rebuild or top-end refresh, ensuring proper sealing across all critical junctures and preventing compression loss, oil weeping, and coolant leaks...09345558- SKU:
- 09345558
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $147.95Now: $119.00Was: $147.95 -
On Sale
PROX Gasket Kit - Complete - Yamaha 34.2414
PROX
MSRP: $125.95Now: $89.00Was: $125.95A complete gasket kit is essential for any engine rebuild or top-end overhaul, ensuring a perfect seal across all critical engine surfaces. Using OEM-equivalent gaskets prevents oil seepage, coolant...09345560- SKU:
- 09345560
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $125.95Now: $89.00Was: $125.95 -
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 34.3319
PROX
MSRP: $114.95Now: $98.00Was: $114.95A complete gasket kit is essential for any engine rebuild or top-end overhaul—it ensures a proper seal across all critical surfaces and prevents oil leaks, coolant weeping, and compression loss...09345577- SKU:
- 09345577
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
MSRP: $114.95Now: $98.00Was: $114.95Qty in Cart: 0Quantity:Price:MSRP: $114.95Now: $98.00Was: $114.95Subtotal: -
On Sale
PROX Gasket Kit - Complete - Suzuki 34.3321
PROX
MSRP: $120.95Now: $98.00Was: $120.95A complete gasket kit is essential for any engine rebuild or major service—it ensures proper sealing across all critical interfaces and prevents oil leaks, coolant seepage, and compression loss that...09345578- SKU:
- 09345578
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- COMPLETE
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- 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 - Suzuki 34.3323
PROX
MSRP: $139.95Now: $119.00Was: $139.95A complete gasket kit is essential for maintaining proper engine sealing and preventing fluid leaks during high-performance operation. Whether you're rebuilding after a refresh or replacing worn...09345580- SKU:
- 09345580
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $139.95Now: $119.00Was: $139.95Qty in Cart: 0Quantity:Price:MSRP: $139.95Now: $119.00Was: $139.95Subtotal: -
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 34.4285
PROX
MSRP: $109.95Now: $93.00Was: $109.95A complete gasket kit is essential for any engine rebuild or top-end overhaul—it ensures a proper seal across all critical junctures and prevents oil leaks, coolant seepage, and combustion blow-by...09345600- SKU:
- 09345600
- 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: $93.00Was: $109.95Qty in Cart: 0Quantity:Price:MSRP: $109.95Now: $93.00Was: $109.95Subtotal: -
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
