Dirt Bike Engine Gaskets and Kits
Dirt Bike Engine Gaskets & Top-End Kits for Yamaha, Honda XR650L & CRF at JJ Motorsports
Refresh your dirt bike's top end with premium engine gaskets and complete kits from JJ Motorsports, precision-manufactured for leak-free sealing, optimal compression, and reliable performance in motocross, enduro, and trail riding. Our selection includes full gasket sets, top-end rebuild kits, O-rings, and head/base gaskets designed for perfect fitment, heat resistance, and easy installation without machining. Compatible with popular models like Yamaha YZ/WR, Honda XR650L, CRF, and more, these high-quality components from trusted brands ensure smoother operation, reduced oil consumption, and extended engine life under dusty, high-RPM conditions. From Moose Racing's comprehensive off-road sets to ProX and Athena's OEM-spec top-end kits, get everything needed for a professional rebuild—head gaskets, valve seals, base gaskets, and more—to restore power and prevent blow-by on every ride.
Shop brands like Moose Racing, ProX, and Athena for race-proven quality. Explore related categories such as dirt bike piston and ring kits for full rebuilds or dirt bike engine for cylinders and valves.
Top Dirt Bike Engine Gaskets & Kits
- Moose Offroad Complete Gasket Set Yamaha 8080037MSE – Full engine gasket kit for Yamaha models; includes all necessary seals, O-rings, and gaskets for complete top-to-bottom rebuild with OEM reliability.
- ProX Top End Gasket Set Honda XR650L 35.1623 – Precision top-end kit for Honda XR650L; features head, base, and valve stem seals for leak-free compression and easy installation.
- Athena Top End Gasket Kit Honda P400210600323 – High-performance top-end rebuild kit for Honda CRF models; includes multi-layer steel head gasket, O-rings, and seals for maximum sealing under extreme conditions.
Browse our in-stock inventory below with same-day shipping and expert support. Free shipping on orders over $99! Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
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BOYESEN Clutch Cover Gasket CCG-06X
BOYESEN
$7.00A compromised clutch cover gasket means oil seepage, potential drivetrain contamination, and unreliable performance when you need it most. The BOYESEN CCG-06X eliminates these risks with a precision-surfaced, asbestos-free design that delivers a true...09340959- SKU:
- 09340959
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- RIDING STYLE:
- STREET
- TYPE:
- CLUTCH COVER
- MATERIAL:
- NITRILE RUBBER
- MODEL:
- FACTORY RACING
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$7.00Qty in Cart: 0Quantity:Price:$7.00Subtotal: -
COMETIC Top End Gasket Kit - DT200 C7142
COMETIC
$32.95A failed top end gasket can cost you races, reliability, and credibility. The COMETIC C7142 kit delivers the sealing integrity and heat management you need to run hard—whether you're naturally aspirated or forced induction. Multi-layered steel...09340369- SKU:
- 09340369
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- PRODUCT NAME:
- GASKET KIT
- BORE SIZE METRIC:
- 68.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$32.95Qty in Cart: 0Quantity:Price:$32.95Subtotal: -
COMETIC Top End Gasket Kit - CR85 C7315
COMETIC
$34.95A quality top-end gasket kit is non-negotiable if you're rebuilding your CR85 engine or chasing reliability at the track. COMETIC's C7315 kit delivers the precision sealing you need to maintain compression, prevent coolant weeping, and keep cylinder...09340380- SKU:
- 09340380
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- GASKET KIT
- THICKNESS METRIC:
- 0.31 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- THICKNESS IMPERIAL:
- 0,012'
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 52.00 MM
$34.95 -
COMETIC Top End Gasket Kit - YZ426F C7689
COMETIC
$47.95Top-end gasket failure compromises combustion sealing and power output—especially critical on high-compression 4-stroke builds. The COMETIC C7689 kit delivers factory-correct fitment for your YZ426F while employing multi-layered steel construction and...09340392- SKU:
- 09340392
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- BORE SIZE METRIC:
- 95.00 MM
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$47.95Qty in Cart: 0Quantity:Price:$47.95Subtotal: -
COMETIC Bottom End Gasket Set - Honda C7010BE
COMETIC
$82.95A complete bottom end gasket set is essential when rebuilding your Honda engine—using OEM-equivalent seals and gaskets ensures proper oil containment, prevents coolant leaks, and maintains critical compression. COMETIC's U.S.-manufactured kits are...09344221- SKU:
- 09344221
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE SIZE METRIC:
- 58.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- BOTTOM END
$82.95Qty in Cart: 0Quantity:Price:$82.95Subtotal: -
COMETIC Bottom End Gasket Set - Honda C7116BE
COMETIC
$82.95A complete bottom-end gasket rebuild is only as reliable as its sealing components—compromised gaskets lead to oil leaks, contamination, and catastrophic engine failure. The COMETIC C7116BE Bottom End Gasket Set delivers OEM-equivalent sealing integrity...09344234- SKU:
- 09344234
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- MODEL:
- HI-PERFORMANCE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- BOTTOM END
- BORE SIZE METRIC:
- 68.50 MM
- RIDING STYLE:
- OFF-ROAD
$82.95Qty in Cart: 0Quantity:Price:$82.95Subtotal: -
COMETIC Top End Gasket Set - Honda C7191
COMETIC
$54.95A compromised top end gasket set will cost you horsepower, reliability, and race time. The COMETIC C7191 delivers the seal integrity and thermal management your high-output engine demands, whether you're running naturally aspirated or forced induction...09344251- SKU:
- 09344251
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE SIZE METRIC:
- 66.50 MM
- THICKNESS IMPERIAL:
- 0,012'
- UNITS:
- KIT
- THICKNESS METRIC:
- 0.31 MM
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
$54.95Qty in Cart: 0Quantity:Price:$54.95Subtotal: -
COMETIC Top End Gasket Set - YZ250 C7855
COMETIC
$47.95A degraded top end gasket set compromises combustion chamber sealing, leading to compression loss and power leaks—especially critical on high-revving 2-strokes where ring seal directly impacts performance. The COMETIC C7855 YZ250 gasket set uses...C7855- SKU:
- C7855
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$47.95Qty in Cart: 0Quantity:Price:$47.95Subtotal: -
COMETIC Top End Gasket Set - Kawasaki C7392
COMETIC
$44.95A failed top-end gasket will cost you more than money—it'll cost you race days and reliability. The COMETIC C7392 gasket set is engineered with multi-layered steel construction and proprietary Viton rubber coating to handle the extreme combustion...C7392- SKU:
- C7392
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 53.00 MM
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
- UNITS:
- KIT
$44.95 -
COMETIC Gasket Set - XR400 C7279
COMETIC
$40.95A quality gasket set is non-negotiable for top-end reliability, especially when you're pushing your XR400 to higher outputs. The COMETIC C7279 keeps combustion pressures sealed and heat managed, preventing catastrophic failures between rebuilds. This is...C7279- SKU:
- C7279
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- BORE SIZE METRIC:
- 86.00 MM
- TYPE:
- TOP END
- UNITS:
- KIT
$40.95 -
COMETIC Gasket Set - TT600 C7213
COMETIC
$36.95High-output engines demand gasket integrity that matches their power output—and standard gaskets simply can't keep up with modern boost levels and cylinder pressures. The COMETIC Gasket Set TT600 C7213 uses multi-layered steel construction with Viton...C7213- SKU:
- C7213
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- BORE SIZE METRIC:
- 97.00 MM
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- TOP END
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$36.95Qty in Cart: 0Quantity:Price:$36.95Subtotal: -
COMETIC Top End Gasket Set - Honda C7116
COMETIC
$47.95A quality top-end gasket set is non-negotiable for any engine rebuild or performance upgrade—gasket failure under high boost or sustained high RPM will compromise compression, leak coolant, and cost you far more in downtime than prevention. COMETIC's...C7116- SKU:
- C7116
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- BORE SIZE METRIC:
- 68.50 MM
- THICKNESS IMPERIAL:
- 0,012'
- THICKNESS METRIC:
- 0.31 MM
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$47.95Qty in Cart: 0Quantity:Price:$47.95Subtotal: -
COMETIC Top End Gasket Set - Kawasaki C7047
COMETIC
$52.95A failing top-end gasket set compromises combustion chamber sealing, reduces ring seal effectiveness, and invites catastrophic engine damage. The COMETIC C7047 eliminates these risks with multi-layered steel construction and advanced sealing technology...C7047- SKU:
- C7047
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 88.00 MM
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$52.95Qty in Cart: 0Quantity:Price:$52.95Subtotal: -
COMETIC Top End Gasket Set - Honda C7020
COMETIC
$51.95A compromised top end gasket is a silent killer of engine performance and reliability. The COMETIC C7020 gasket set eliminates the guesswork with precision-engineered components designed to handle high-output naturally aspirated and forced induction...C7020- SKU:
- C7020
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- THICKNESS IMPERIAL:
- 0,012'
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 91.00 MM
- PRODUCT NAME:
- GASKET KIT
- THICKNESS METRIC:
- 0.31 MM
$51.95 -
On Sale
ATHENA Complete Gasket Kit - Suzuki P400510850126
ATHENA
MSRP: $44.95Now: $40.00Was: $44.95A complete top-end rebuild demands gasket integrity you can trust—especially when operating at elevated temperatures or high RPM. The ATHENA Complete Gasket Kit delivers OEM-quality sealing across all critical engine surfaces, eliminating the risk of...400510850126- SKU:
- 400510850126
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $44.95Now: $40.00Was: $44.95 -
On Sale
ATHENA Complete Gasket Kit - Suzuki P400510850082
ATHENA
MSRP: $32.95Now: $30.00Was: $32.95A complete engine rebuild demands gasket integrity at every critical sealing point—this Athena kit eliminates the risk of leak-prone piecemeal sourcing by delivering every top-end and full-engine gasket you need in one factory-matched set. The...400510850082- SKU:
- 400510850082
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
MSRP: $32.95Now: $30.00Was: $32.95 -
On Sale
ATHENA Complete Gasket Kit - Suzuki P400510850031
ATHENA
MSRP: $86.95Now: $78.00Was: $86.95A complete engine rebuild demands gasket materials that can withstand extreme temperatures and sustained pressure without compromising the integrity of your seal. The ATHENA Complete Gasket Kit eliminates the frustration of sourcing individual components...400510850031- SKU:
- 400510850031
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
MSRP: $86.95Now: $78.00Was: $86.95Qty in Cart: 0Quantity:Price:MSRP: $86.95Now: $78.00Was: $86.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - Suzuki P400510850030
ATHENA
MSRP: $74.95Now: $67.00Was: $74.95When rebuilding your engine, gasket failure isn't an option—it costs time and money you don't have. The ATHENA Complete Gasket Kit delivers the sealing integrity you need across extreme temperature swings and high-RPM abuse, with engineered materials...400510850030- SKU:
- 400510850030
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $74.95Now: $67.00Was: $74.95 -
On Sale
ATHENA Top End Gasket Kit - Suzuki P400510600124
ATHENA
MSRP: $20.95Now: $19.00Was: $20.95A competitive engine demands fresh gaskets before race day—and the ATHENA Top End Gasket Kit delivers the reliability you need when it matters most. Whether you're running stock compression on pump gas or stepping up to race fuel and higher boost, this...400510600124- SKU:
- 400510600124
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
MSRP: $20.95Now: $19.00Was: $20.95Qty in Cart: 0Quantity:Price:MSRP: $20.95Now: $19.00Was: $20.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - Yamaha P400485850491
ATHENA
MSRP: $34.95Now: $31.00Was: $34.95A complete engine rebuild demands gasket integrity that won't fail under extreme operating conditions. Athena's gasket kit delivers the material science and engineering precision needed to maintain cylinder pressure, prevent oil seepage, and ensure...400485850491- SKU:
- 400485850491
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $34.95Now: $31.00Was: $34.95
