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
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WSM Oil Drain Plug - Yamaha 011-156
WSM
$7.21Replacement oil drain plugs07120358- SKU:
- 07120358
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- PLUG
- STYLE:
- 2-STROKE
- STYLE:
- YAMAHA
- BASE COLOR:
- BLACK
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- OIL DRAIN
$7.21 -
WSM Oil Drain Plug - Sea-Doo 011-161
WSM
$9.77Replacement oil drain plugs07120359- SKU:
- 07120359
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- STYLE:
- SEA-DOO
- TYPE:
- OIL DRAIN
- BASE COLOR:
- BLACK
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- PLUG
- UNITS:
- EACH
$9.77 -
WSM Top-End Rebuild Kit - Platinum Series - Standard 010-824-10P
WSM
$510.93Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets09030749- SKU:
- 09030749
- Availability:
- Ships Same Business Day
- Weight:
- 5.50 LBS
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- WATERCRAFT
- MODEL:
- PLATINUM SERIES
- TYPE:
- TOP END
- UNITS:
- EACH
- BORE SIZE METRIC:
- 84.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PISTON SIZE METRIC:
- STANDARD
$510.93 -
On Sale
XCELDYNE Intake Valve Kit X2SIVM13001
XCELDYNE
MSRP: $47.95Now: $31.00Was: $47.95Offer the off-road enthusiast superior performance at an excellent value, Incorporate a high flow design for maximum power and long service life, X2 Titanium Valves are full CrN coated for extended service life, The X2 valvetrain kits are complete with...09262206- SKU:
- 09262206
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- +1 MM HEAD DIAMETER
- BASE COLOR:
- SILVER
- MODEL:
- X2
- UNITS:
- EACH
- COLOR/FINISH:
- STEEL
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE
- APPLICATION:
- SINGLE INTAKE
- RIDING STYLE:
- ATV
- STYLE:
- HIGH-FLOW
MSRP: $47.95Now: $31.00Was: $47.95 -
XCELDYNE Intake Valve Kit X2SIVM42002
XCELDYNE
$40.04Offer the off-road enthusiast superior performance at an excellent value, Incorporate a high flow design for maximum power and long service life, X2 Titanium Valves are full CrN coated for extended service life, The X2 valvetrain kits are complete with...09262216- SKU:
- 09262216
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- OUTER
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- HIGH-FLOW
- BASE COLOR:
- SILVER
- APPLICATION:
- SINGLE INTAKE
- UNITS:
- EACH
- COLOR/FINISH:
- STEEL
- MODEL:
- X2
- PRODUCT NAME:
- VALVE
$40.04 -
BLOWSION Base Gasket - .020" - Kawasaki 750/800 01-03-302
BLOWSION
$29.95Simple to install stainless and reusable base gasket, simply clean both mating surfaces and install, Gasket with metal core for blow-out protection, No need to use messy gasket sealants like others09344575- SKU:
- 09344575
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- CYLINDER BASE
- UNITS:
- KIT
- MATERIAL:
- STAINLESS STEEL
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
- MODEL:
- SUPER
- THICKNESS:
- 0,51 MM (0,020')
$29.95 -
BOLT Drain Plug Washer Kit DPW.KTM
BOLT
$4.99Contains eight M12 x 18mm, four M10- x 14mm and four M6 x 10mm copper seal washers09200154- SKU:
- 09200154
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- WASHER
- TYPE:
- DRAIN
- UNITS:
- 8 PACK
- RIDING STYLE:
- OFF-ROAD
$4.99 -
ATHENA Cylinder Kit - YZ125 - 54mm P400485100003
ATHENA
$1,110.95Kits 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 required4.00485E+11- SKU:
- 4.00485E+11
- Availability:
- Ships Same Business Day
- Weight:
- 88.00 LBS
$1,110.95 -
ATHENA Cylinder Kit - YZ125 - 54mm P400485100008
ATHENA
$971.95Kits 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 required400485100008- SKU:
- 400485100008
- Availability:
- Ships Same Business Day
- Weight:
- 70.00 LBS
$971.95 -
ATHENA Top End Gasket Kit - Yamaha P400485600089
ATHENA
$21.95Specifically 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...400485600089- SKU:
- 400485600089
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$21.95 -
ATHENA Top End Gasket Kit - Kawasaki P400250600069
ATHENA
$89.95Specifically 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...09346466- SKU:
- 09346466
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$89.95 -
ATHENA Complete Gasket Kit - Kawasaki P400250900069
ATHENA
$260.95Head 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...09346467- SKU:
- 09346467
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$260.95 -
ATHENA Race Gasket Kit - Kawasaki R2506-069
ATHENA
$54.95Specifically 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...09346469- SKU:
- 09346469
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
$54.95 -
ATHENA Complete Gasket Kit - Yamaha P400485900213
ATHENA
$172.95Head 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...09346471- SKU:
- 09346471
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$172.95 -
ATHENA Race Gasket Kit - Yamaha R4856-213
ATHENA
$72.95Specifically 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...09346472- SKU:
- 09346472
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- ENGINE
- UNITS:
- KIT
$72.95 -
ATHENA Race Gasket Kit - Honda R2106-317
ATHENA
$71.95Head 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...09345462- SKU:
- 09345462
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
$71.95 -
ATHENA Top End Gasket Kit - Honda P400210600317
ATHENA
$82.95Head 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...09345463- SKU:
- 09345463
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
$82.95 -
ATHENA Top End Gasket Kit - Husqvarna P400270600077
ATHENA
$93.95Head 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...09345465- SKU:
- 09345465
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$93.95 -
ATHENA Complete Gasket Kit - Husqvarna P400270900077
ATHENA
$231.95Head 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...09345466- SKU:
- 09345466
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$231.95 -
ATHENA Top End Gasket Kit - Husqvarna P400270600078
ATHENA
$97.95Head 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...09345471- SKU:
- 09345471
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$97.95
