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
-
On Sale
ATHENA Complete Gasket Kit - Suzuki P400510850035
ATHENA
MSRP: $78.95Now: $71.00Was: $78.95Superior-quality gasket sets from Athena, Head gaskets feature rubber-coated spring steel construction, Soft steel base gaskets are rubber coated, Steel core materials feature high springback and superior tensile strength, Revolutionary transparent...09340208- SKU:
- 09340208
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- ENGINE TYPE:
- 2-STROKE
MSRP: $78.95Now: $71.00Was: $78.95Qty in Cart: 0Quantity:Price:MSRP: $78.95Now: $71.00Was: $78.95Subtotal: -
On Sale
ATHENA Gasket Kit - WR250R/X - 83 mm P400485160017
ATHENA
MSRP: $99.95Now: $90.00Was: $99.95Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets, Forged piston with molybdenum coating, Special gasket kit, Easy-to-follow step-by-step installation instructions, All are bolt-on; no machining required09341846- SKU:
- 09341846
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- BORE SIZE METRIC:
- 83.00 MM
- DISPLACEMENT:
- 290 CC
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- BORE SIZE:
- 83,00 MM
MSRP: $99.95Now: $90.00Was: $99.95 -
On Sale
ATHENA Complete Gasket Kit - Husqvarna P400220850261
ATHENA
MSRP: $256.95Now: $231.00Was: $256.95Superior-quality gasket sets from Athena, Head gaskets feature rubber-coated spring steel construction, Soft steel base gaskets are rubber coated, Steel core materials feature high springback and superior tensile strength, Revolutionary transparent...09342788- SKU:
- 09342788
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- ENGINE TYPE:
- -
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
MSRP: $256.95Now: $231.00Was: $256.95Qty in Cart: 0Quantity:Price:MSRP: $256.95Now: $231.00Was: $256.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - KX250 P400250850021
ATHENA
MSRP: $105.95Now: $95.00Was: $105.95Head gaskets feature rubber-coated spring steel construction, Soft steel base gaskets are rubber coated, Steel core materials feature high spring-back and superior tensile strength, Revolutionary transparent coating guarantees a perfect seal even at...09342790- SKU:
- 09342790
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $105.95Now: $95.00Was: $105.95Qty in Cart: 0Quantity:Price:MSRP: $105.95Now: $95.00Was: $105.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - KTM P400270850049
ATHENA
MSRP: $103.95Now: $94.00Was: $103.95Superior-quality gasket sets from Athena, Head gaskets feature rubber-coated spring steel construction, Soft steel base gaskets are rubber coated, Steel core materials feature high springback and superior tensile strength, Revolutionary transparent...09342791- SKU:
- 09342791
- Availability:
- Ships Same Business Day
- Weight:
- 0.17 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- ENGINE TYPE:
- -
- PRODUCT NAME:
- GASKET KIT
MSRP: $103.95Now: $94.00Was: $103.95 -
On Sale
ATHENA Complete Gasket Kit - KTM P400270850028
ATHENA
MSRP: $129.95Now: $117.00Was: $129.95Superior-quality gasket sets from Athena, Head gaskets feature rubber-coated spring steel construction, Soft steel base gaskets are rubber coated, Steel core materials feature high springback and superior tensile strength, Revolutionary transparent...09342792- SKU:
- 09342792
- Availability:
- Ships Same Business Day
- Weight:
- 0.37 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- RIDING STYLE:
- STREET
- ENGINE TYPE:
- -
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
MSRP: $129.95Now: $117.00Was: $129.95 -
On Sale
ATHENA Race Gasket Kit - CRF250R R2106-245
ATHENA
MSRP: $55.95Now: $50.00Was: $55.95Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during mid-season, Kits include a top-of-the line MLSS head gasket and two or more premium-quality base gaskets of different thicknesses to...09342807- SKU:
- 09342807
- Availability:
- Ships Same Business Day
- Weight:
- 0.23 LBS
- MATERIAL:
- RUBBER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- STEEL
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET KIT
- STYLE:
- RACE
MSRP: $55.95Now: $50.00Was: $55.95 -
On Sale
ATHENA Complete Gasket Kit - KTM P400270900061
ATHENA
MSRP: $176.95Now: $159.00Was: $176.95Superior-quality gasket sets from Athena, Head gaskets feature rubber-coated spring steel construction, Soft steel base gaskets are rubber coated, Steel core materials feature high springback and superior tensile strength, Revolutionary transparent...09343011- SKU:
- 09343011
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- UNITS:
- KIT
- ENGINE TYPE:
- -
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
MSRP: $176.95Now: $159.00Was: $176.95 -
On Sale
ATHENA Top End Gasket Kit - Honda P400210600172
ATHENA
MSRP: $113.95Now: $103.00Was: $113.95Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during midseason. Gives the rider a choice of using standard gas with stock compression, or race gas with a higher compression. Kits do not...09343023- SKU:
- 09343023
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- TYPE:
- TOP END
- UNITS:
- KIT
MSRP: $113.95Now: $103.00Was: $113.95Qty in Cart: 0Quantity:Price:MSRP: $113.95Now: $103.00Was: $113.95Subtotal: -
On Sale
ATHENA Top End Gasket Kit - Honda P400210600198
ATHENA
MSRP: $78.95Now: $71.00Was: $78.95Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during midseason. Gives the rider a choice of using standard gas with stock compression, or race gas with a higher compression. Kits do not...09343024- SKU:
- 09343024
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- TYPE:
- TOP END
MSRP: $78.95Now: $71.00Was: $78.95Qty in Cart: 0Quantity:Price:MSRP: $78.95Now: $71.00Was: $78.95Subtotal: -
On Sale
ATHENA Top End Gasket Kit - Kawasaki P400250600029
ATHENA
MSRP: $119.95Now: $108.00Was: $119.95Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during midseason. Gives the rider a choice of using standard gas with stock compression, or race gas with a higher compression. Kits do not...09343028- SKU:
- 09343028
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- TYPE:
- TOP END
- MATERIAL:
- SILICONE
- UNITS:
- KIT
MSRP: $119.95Now: $108.00Was: $119.95Qty in Cart: 0Quantity:Price:MSRP: $119.95Now: $108.00Was: $119.95Subtotal: -
On Sale
ATHENA Top End Gasket Kit - Yamaha P400485600156
ATHENA
MSRP: $131.95Now: $119.00Was: $131.95Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during midseason. Gives the rider a choice of using standard gas with stock compression, or race gas with a higher compression. Kits do not...09343034- SKU:
- 09343034
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- TYPE:
- TOP END
- UNITS:
- KIT
MSRP: $131.95Now: $119.00Was: $131.95Qty in Cart: 0Quantity:Price:MSRP: $131.95Now: $119.00Was: $131.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - Yamaha P400485850078
ATHENA
MSRP: $156.95Now: $141.00Was: $156.95Superior-quality gasket sets from Athena, Head gaskets feature rubber-coated spring steel construction, Soft steel base gaskets are rubber coated, Steel core materials feature high springback and superior tensile strength, Revolutionary transparent...09343045- SKU:
- 09343045
- Availability:
- Ships Same Business Day
- Weight:
- 0.49 LBS
- RIDING STYLE:
- ATV
- TYPE:
- COMPLETE
- ENGINE TYPE:
- -
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
MSRP: $156.95Now: $141.00Was: $156.95 -
On Sale
ATHENA Complete Gasket Kit P400270160067
ATHENA
MSRP: $56.95Now: $51.00Was: $56.95Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets, Forged piston with molybdenum coating, Special gasket kit, Easy-to-follow step-by-step installation instructions, All are bolt-on; no machining required09343157- SKU:
- 09343157
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- BORE SIZE:
- 82,00 MM
- BORE SIZE METRIC:
- 82.00 MM
- DISPLACEMENT:
- 276 CC
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
MSRP: $56.95Now: $51.00Was: $56.95Qty in Cart: 0Quantity:Price:MSRP: $56.95Now: $51.00Was: $56.95Subtotal: -
On Sale
ATHENA Top End Gasket Kit - Yamaha P400485600197
ATHENA
MSRP: $57.95Now: $52.00Was: $57.95Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during midseason. Gives the rider a choice of using standard gas with stock compression, or race gas with a higher compression. Kits do not...09346215- SKU:
- 09346215
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- TYPE:
- TOP END
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $57.95Now: $52.00Was: $57.95Qty in Cart: 0Quantity:Price:MSRP: $57.95Now: $52.00Was: $57.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - Honda P400210900320
ATHENA
MSRP: $209.95Now: $189.00Was: $209.95Head gaskets feature rubber-coated spring steel construction, Soft steel base gaskets are rubber coated, Steel core materials feature high spring-back and superior tensile strength, Revolutionary transparent coating guarantees a perfect seal even at...09346349- SKU:
- 09346349
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $209.95Now: $189.00Was: $209.95 -
On Sale
ATHENA Race Gasket Kit - Yamaha R4856-199
ATHENA
MSRP: $25.95Now: $23.00Was: $25.95Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during mid-season, Kits include a top-of-the line MLSS head gasket and two or more premium-quality base gaskets of different thicknesses to...09346370- SKU:
- 09346370
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- PRODUCT NAME:
- GASKET KIT
- STYLE:
- RACE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
MSRP: $25.95Now: $23.00Was: $25.95 -
On Sale
ATHENA Complete Gasket Kit - Kawasaki P400250850028
ATHENA
MSRP: $151.95Now: $137.00Was: $151.95Superior-quality gasket sets from Athena, Head gaskets feature rubber-coated spring steel construction, Soft steel base gaskets are rubber coated, Steel core materials feature high springback and superior tensile strength, Revolutionary transparent...09343039- SKU:
- 09343039
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- TYPE:
- COMPLETE
- ENGINE TYPE:
- -
- UNITS:
- KIT
MSRP: $151.95Now: $137.00Was: $151.95Qty in Cart: 0Quantity:Price:MSRP: $151.95Now: $137.00Was: $151.95Subtotal: -
MOOSE RACING Ignition Cover Gasket 816618
MOOSE RACING
$5.74Made in the U.S.A.09346157- SKU:
- 09346157
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- TYPE:
- IGNITION COVER
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$5.74 -
Cylinder Works Big Bore Gasket Kit Honda CRF250R 2004-2009 11001-G01
CYLINDER WORKS
$64.95If you're running a Honda CRF250R and serious about extracting more power from your engine, a big bore kit is one of the most direct paths to measurable performance gains. The Cylinder Works Big Bore Gasket Kit delivers a complete displacement upgrade...09341521- SKU:
- 09341521
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
- BORE SIZE METRIC:
- OVERSIZED (+3.00 MM)
- MATERIAL:
- NICKEL SILICON CARBIDE
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- BIG BORE
$64.95Qty in Cart: 0Quantity:Price:$64.95Subtotal:
