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
ATHENA Complete Gasket Kit - KTM P400060850143
ATHENA
MSRP: $46.95Now: $42.00Was: $46.95Superior-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...09340217- SKU:
- 09340217
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- ENGINE TYPE:
- -
- PRODUCT NAME:
- GASKET KIT
MSRP: $46.95Now: $42.00Was: $46.95Qty in Cart: 0Quantity:Price:MSRP: $46.95Now: $42.00Was: $46.95Subtotal: -
ATHENA Cylinder Kit - KTM/Husqvarna P400270100023
ATHENA
$974.95Kits 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 required09310865- SKU:
- 09310865
- Availability:
- Ships Same Business Day
- Weight:
- 3.91 LBS
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- BORE SIZE METRIC:
- 82.00 MM
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- DISPLACEMENT:
- 276 CC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- ALUMINUM
$974.95 -
On Sale
ATHENA Cylinder Kit - Yamaha - Stock P400485100053
ATHENA
MSRP: $772.80Now: $696.00Was: $772.80Kits 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 required09310958- SKU:
- 09310958
- Availability:
- Ships Same Business Day
- Weight:
- 4.66 LBS
- BORE SIZE METRIC:
- 97.00 MM
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- ALUMINUM
- DISPLACEMENT:
- 450 CC
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- STOCK BORE
- UNITS:
- KIT
MSRP: $772.80Now: $696.00Was: $772.80Qty in Cart: 0Quantity:Price:MSRP: $772.80Now: $696.00Was: $772.80Subtotal: -
On Sale
ATHENA Cylinder Kit - Yamaha - Stock P400485100067
ATHENA
MSRP: $772.95Now: $696.00Was: $772.95Kits 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 required09310959- SKU:
- 09310959
- Availability:
- Ships Same Business Day
- Weight:
- 4.61 LBS
- PRODUCT NAME:
- CYLINDER KIT
- DISPLACEMENT:
- 450 CC
- STYLE:
- STOCK BORE
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 97.00 MM
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- ALUMINUM
MSRP: $772.95Now: $696.00Was: $772.95Qty in Cart: 0Quantity:Price:MSRP: $772.95Now: $696.00Was: $772.95Subtotal: -
On Sale
ATHENA Cylinder Kit - Yamaha - Big Bore P400485100068
ATHENA
MSRP: $1,236.95Now: $1,113.00Was: $1,236.95Kits 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 required09310960- SKU:
- 09310960
- Availability:
- Ships Same Business Day
- Weight:
- 4.36 LBS
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- UNITS:
- KIT
- BORE SIZE METRIC:
- 102.00 MM
- DISPLACEMENT:
- 496 CC
- MATERIAL:
- ALUMINUM
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
MSRP: $1,236.95Now: $1,113.00Was: $1,236.95 -
On Sale
ATHENA Top End Gasket Kit - KTM P400270600023
ATHENA
MSRP: $77.95Now: $70.00Was: $77.95Specifically 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...09341785- SKU:
- 09341785
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- UNITS:
- KIT
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
MSRP: $77.95Now: $70.00Was: $77.95Qty in Cart: 0Quantity:Price:MSRP: $77.95Now: $70.00Was: $77.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - Husqvarna P400220850252
ATHENA
MSRP: $89.95Now: $81.00Was: $89.95Superior-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...09341824- SKU:
- 09341824
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- GASKET KIT
- ENGINE TYPE:
- -
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- RIDING STYLE:
- STREET
MSRP: $89.95Now: $81.00Was: $89.95 -
On Sale
ATHENA Top End Gasket Kit - Honda P400210600183
ATHENA
MSRP: $46.95Now: $42.00Was: $46.95Specifically 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...09341970- SKU:
- 09341970
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- MATERIAL:
- RUBBER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET KIT
MSRP: $46.95Now: $42.00Was: $46.95 -
On Sale
ATHENA Top End Gasket Kit - KTM P400270600013
ATHENA
MSRP: $24.95Now: $22.00Was: $24.95Specifically 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...09341982- SKU:
- 09341982
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- PRODUCT NAME:
- GASKET KIT
- MATERIAL:
- RUBBER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
MSRP: $24.95Now: $22.00Was: $24.95 -
On Sale
ATHENA Top End Gasket Kit - KTM P400270600016
ATHENA
MSRP: $73.95Now: $67.00Was: $73.95Specifically 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...09341983- SKU:
- 09341983
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- RUBBER
- TYPE:
- TOP END
- UNITS:
- KIT
MSRP: $73.95Now: $67.00Was: $73.95 -
On Sale
ATHENA Top End Gasket Kit - Suzuki P400510600069
ATHENA
MSRP: $45.95Now: $41.00Was: $45.95Specifically 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...09341985- SKU:
- 09341985
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
- MATERIAL:
- RUBBER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $45.95Now: $41.00Was: $45.95Qty in Cart: 0Quantity:Price:MSRP: $45.95Now: $41.00Was: $45.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - Honda P400210850183
ATHENA
MSRP: $76.95Now: $69.00Was: $76.95Superior-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...09341990- SKU:
- 09341990
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- ENGINE TYPE:
- -
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $76.95Now: $69.00Was: $76.95Qty in Cart: 0Quantity:Price:MSRP: $76.95Now: $69.00Was: $76.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - Honda P400210850184
ATHENA
MSRP: $74.95Now: $67.00Was: $74.95Superior-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...09341991- SKU:
- 09341991
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- GASKET KIT
- ENGINE TYPE:
- -
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $74.95Now: $67.00Was: $74.95Qty in Cart: 0Quantity:Price:MSRP: $74.95Now: $67.00Was: $74.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - Honda P400210850192
ATHENA
MSRP: $88.95Now: $80.00Was: $88.95Superior-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...09341992- SKU:
- 09341992
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
- PRODUCT NAME:
- GASKET KIT
- ENGINE TYPE:
- -
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $88.95Now: $80.00Was: $88.95 -
On Sale
ATHENA Complete Gasket Kit - Honda P400210850215
ATHENA
MSRP: $194.95Now: $175.00Was: $194.95Superior-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...09341993- SKU:
- 09341993
- Availability:
- Ships Same Business Day
- Weight:
- 0.47 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- ENGINE TYPE:
- -
- UNITS:
- KIT
MSRP: $194.95Now: $175.00Was: $194.95Qty in Cart: 0Quantity:Price:MSRP: $194.95Now: $175.00Was: $194.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - Honda P400210850239
ATHENA
MSRP: $210.95Now: $190.00Was: $210.95Superior-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...09341994- SKU:
- 09341994
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- ENGINE TYPE:
- -
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $210.95Now: $190.00Was: $210.95Qty in Cart: 0Quantity:Price:MSRP: $210.95Now: $190.00Was: $210.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - KTM P400270850047
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...09342001- SKU:
- 09342001
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- PRODUCT NAME:
- GASKET KIT
- ENGINE TYPE:
- -
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $103.95Now: $94.00Was: $103.95 -
On Sale
ATHENA Complete Gasket Kit - KTM P400270850013
ATHENA
MSRP: $73.95Now: $67.00Was: $73.95Superior-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...09342002- SKU:
- 09342002
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- ENGINE TYPE:
- -
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $73.95Now: $67.00Was: $73.95 -
On Sale
ATHENA Complete Gasket Kit - KTM P400270850016
ATHENA
MSRP: $131.95Now: $119.00Was: $131.95Superior-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...09342003- SKU:
- 09342003
- Availability:
- Ships Same Business Day
- Weight:
- 0.37 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- ENGINE TYPE:
- -
- UNITS:
- KIT
MSRP: $131.95Now: $119.00Was: $131.95 -
On Sale
ATHENA Complete Gasket Kit - KTM P400270850036
ATHENA
MSRP: $244.95Now: $220.00Was: $244.95Superior-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...09342004- SKU:
- 09342004
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- ENGINE TYPE:
- -
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $244.95Now: $220.00Was: $244.95
