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!
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MOOSE RACING Motor Gasket Kit with Seal - KX500 811474
MOOSE RACING
$73.14A complete engine and transmission rebuild demands precision-fit gaskets and seals—OEM quality without the OEM price tag. This Moose Racing kit eliminates the frustration of sourcing individual...M811474- SKU:
- M811474
- Availability:
- Ships Same Business Day
- Weight:
- 0.32 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
$73.14 -
MOOSE RACING Motor Gasket Kit with Seal - YZ250 811665
MOOSE RACING
$68.97A complete engine and transmission rebuild demands OEM-quality gaskets and seals, but OEM pricing shouldn't break your budget. The MOOSE RACING Motor Gasket Kit delivers genuine replacement seals and...M811665- SKU:
- M811665
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- TYPE:
- ENGINE
$68.97 -
On Sale
KIBBLEWHITE Exhaust Valve - Suzuki 60-60718T
KIBBLEWHITE
MSRP: $109.33Now: $98.40Was: $109.33Exhaust valves are a critical wear item in high-revving engines, and OEM replacements often can't keep pace with sustained performance demands. The KIBBLEWHITE Tensilite® exhaust valve combines...09262761- SKU:
- 09262761
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- TITANIUM
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.2150'
- TULIP ANGLE:
- 20°
- MODEL:
- TENSILITE®
- UNITS:
- EACH
- HEAD DIAMETER METRIC:
- 31.00 MM
- RIDING STYLE:
- OFF-ROAD
MSRP: $109.33Now: $98.40Was: $109.33 -
On Sale
KIBBLEWHITE Valve Guide Seal - Intake/Exhaust 71040-4
KIBBLEWHITE
MSRP: $13.96Now: $12.56Was: $13.96Valve guide seals are critical to preventing oil from seeping into your combustion chambers—a common source of blue smoke, carbon buildup, and lost performance. The KIBBLEWHITE 71040-4 uses Viton...09263100- SKU:
- 09263100
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- SEAL
- STEM DIAMETER IMPERIAL:
- 0.333'
- OUTSIDE DIAMETER IMPERIAL:
- 0.4550'
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
- TYPE:
- VALVE GUIDE
- MATERIAL:
- VITON
- UNITS:
- 4 PACK
MSRP: $13.96Now: $12.56Was: $13.96 -
Cylinder Works Standard Bore Cylinder KTM 65 SX 2009-2022 50005
CYLINDER WORKS
$631.95Upgrade your engine with the Cylinder Works Standard 50005, a high-performance, ready-to-install direct bolt-on cylinder. Engineered for durability and precision, this cylinder offers a seamless fit...09311015- SKU:
- 09311015
- Availability:
- Ships Same Business Day
- Weight:
- 2.51 LBS
- ENGINE TYPE:
- 2-CYCLE
- STYLE:
- STANDARD
- CYLINDER DIAMETER:
- 45,00 MM
- CYLINDER DIAMETER METRIC:
- 45.00 MM
- UNITS:
- EACH
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
$631.95 -
POWERSTANDS RACING Oil Cap Kit - Gold - M20 x 2.5 00-01311-23
POWERSTANDS RACING
$31.95CNC-machined from high-quality aluminum, E-clip is already safety wired to a mounting tab and the wire covered with silicon tubing that will not melt or discolor, Excellent resistance to extreme heat09500562- SKU:
- 09500562
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- GOLD
- PRODUCT NAME:
- CAP KIT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- OIL FILLER
- RIDING STYLE:
- STREET
- DIAMETER - THREAD SIZE IMPERIAL:
- M20 X 2.5
- MATERIAL:
- ALUMINUM
$31.95 -
On Sale
Wossner Honda CR250R 2002-2004 Piston Kit 8066DA
WOSSNER
MSRP: $152.00Now: $144.40Was: $152.00If you're running a 2002-2004 Honda CR250R, a worn or damaged piston directly kills your engine's efficiency, compression, and throttle response. The Wössner 8066DA delivers the reliability and...09104773- SKU:
- 09104773
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE SIZE METRIC:
- 66.40 MM
- ENGINE TYPE:
- 2-STROKE
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 66.34 MM
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- FORGED
- TYPE:
- DUAL RING
MSRP: $152.00Now: $144.40Was: $152.00 -
On Sale
ATHENA Water Pump Gasket Kit - Honda P400210475008
ATHENA
MSRP: $27.95Now: $25.00Was: $27.95Proper coolant sealing is non-negotiable in high-performance applications—a failed water pump gasket can lead to catastrophic overheating and engine damage. The ATHENA Water Pump Gasket Kit delivers...09346044- SKU:
- 09346044
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- WATER PUMP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $27.95Now: $25.00Was: $27.95 -
On Sale
ATHENA Water Pump Gasket Kit - Yamaha P400485475007
ATHENA
MSRP: $37.95Now: $34.00Was: $37.95Include water pump gasket, clutch cover gasket, water pump shaft oil seals and washers, Kit contents will vary slightly based on application, Kits do not contain replacement bearings09346089- SKU:
- 09346089
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
MSRP: $37.95Now: $34.00Was: $37.95 -
On Sale
ATHENA Water Pump Gasket Kit - Yamaha P400485475009
ATHENA
MSRP: $39.95Now: $36.00Was: $39.95Include water pump gasket, clutch cover gasket, water pump shaft oil seals and washers, Kit contents will vary slightly based on application, Kits do not contain replacement bearings09346091- SKU:
- 09346091
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- TYPE:
- WATER PUMP
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $39.95Now: $36.00Was: $39.95 -
On Sale
ATHENA Race Gasket Kit - YZ 125 R4856-118
ATHENA
MSRP: $18.95Now: $17.00Was: $18.95Specifically 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...09342840- SKU:
- 09342840
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- STYLE:
- RACE
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET KIT
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $18.95Now: $17.00Was: $18.95 -
On Sale
ATHENA Piston Kit S4F05400017C
ATHENA
MSRP: $130.95Now: $118.00Was: $130.95Two-stroke pistons are made from 4032 silicium, Four-stroke pistons are made from 2618 silicium - the same material used to produce Formula 1 pistons, Both include 3% copper in materials for better...09103893- SKU:
- 09103893
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BORE SIZE METRIC:
- 53.97 MM
- DISPLACEMENT:
- 124 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- C
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STOCK
- PISTON HEAD SHAPE:
- FLAT TOP
- UNITS:
- KIT
MSRP: $130.95Now: $118.00Was: $130.95 -
On Sale
ATHENA Piston Kit S4F06640018C
ATHENA
MSRP: $187.95Now: $169.00Was: $187.95Two-stroke pistons are made from 4032 silicium, Four-stroke pistons are made from 2618 silicium - the same material used to produce Formula 1 pistons, Both include 3% copper in materials for better...09103894- SKU:
- 09103894
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- BORE SIZE METRIC:
- 66.36 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- PISTON HEAD SHAPE:
- DOMED
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- C
- COMPRESSION RATIO IMPERIAL:
- STOCK
- UNITS:
- KIT
MSRP: $187.95Now: $169.00Was: $187.95 -
On Sale
ATHENA Top End Gasket Kit P400250600015
ATHENA
MSRP: $34.95Now: $31.00Was: $34.95Specifically 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,...09340205- SKU:
- 09340205
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- RUBBER
- UNITS:
- KIT
- TYPE:
- TOP END
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
MSRP: $34.95Now: $31.00Was: $34.95 -
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...09341846- 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 - 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...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...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 - 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...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 - 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...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...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
