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 Top-End Rebuild Kit - Original Series - .50 mm 010-825-12
WSM
$238.39Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets01082512- SKU:
- 01082512
- Availability:
- Ships Same Business Day
- Weight:
- 2.90 LBS
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
- MODEL:
- ORIGINAL SERIES
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- +0,50 MM
- BORE SIZE METRIC:
- 81.50 MM
- PISTON MATERIAL:
- ALUMINUM
$238.39Qty in Cart: 0Quantity:Price:$238.39Subtotal: -
WSM Piston Kit - Polaris - Standard 010-832K
WSM
$93.60Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...010832- SKU:
- 010832
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- STANDARD
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 81.00 MM
- PRODUCT NAME:
- PISTON KIT
$93.60Qty in Cart: 0Quantity:Price:$93.60Subtotal: -
WSM Top-End Rebuild Kit - Original Series - Standard 010-832-10
WSM
$229.87Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets01083210- SKU:
- 01083210
- Availability:
- Ships Same Business Day
- Weight:
- 2.95 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 81.00 MM
$229.87Qty in Cart: 0Quantity:Price:$229.87Subtotal: -
WSM Motor Mount - S800 RR 011-109
WSM
$43.49Replacements for broken or worn-out OEM motor mounts011109- SKU:
- 011109
- Availability:
- Ships Same Business Day
- Weight:
- 0.63 LBS
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- MOUNT
- UNITS:
- EACH
- TYPE:
- ENGINE
$43.49Qty in Cart: 0Quantity:Price:$43.49Subtotal: -
MOOSE RACING Valve Shim - 7.48 x 1.65 - 5 pack MSE5PK748165
MOOSE RACING
$9.95Complete valve shim kits make it easier to maintain your valve train, Forged from 4140 cold rolled steel, not sintered, Laser-etched size on each shim for identification, A great addition to any mechanic's tool box, Refills sold to dealers in 5-packs;...09261867- SKU:
- 09261867
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ATV
- VALVE SHIM THICKNESS METRIC:
- 1.65 MM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
$9.95Qty in Cart: 0Quantity:Price:$9.95Subtotal: -
MOOSE RACING Valve Shim - 8.90 x 2.16 - 5 pack MSE5PK890216
MOOSE RACING
$10.95Complete valve shim kits make it easier to maintain your valve train, Forged from 4140 cold rolled steel, not sintered, Laser-etched size on each shim for identification, A great addition to any mechanic's tool box, Refills sold to dealers in 5-packs;...09261916- SKU:
- 09261916
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 2.16 MM
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ATV
$10.95Qty in Cart: 0Quantity:Price:$10.95Subtotal: -
MOOSE RACING Crank Bearing - KTM 24-1099
MOOSE RACING
$39.95Precision crank bearings, Kits contain right and left crankshaft bearings, Seals designed with a fluorocarbon lip to reduce dry start friction on 2-stroke engines09240221- SKU:
- 09240221
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- TYPE:
- BALL
- APPLICATION:
- CRANKSHAFT
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$39.95Qty in Cart: 0Quantity:Price:$39.95Subtotal: -
MOOSE RACING Complete Motor Gasket Kit - XR250 808263
MOOSE RACING
$72.05Moose can now handle all your gasket and seal needs at a fraction of OEM cost., High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...09340135- SKU:
- 09340135
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$72.05Qty in Cart: 0Quantity:Price:$72.05Subtotal: -
VESRAH Complete Gasket Kit - KDX/KX 250 VG-453
VESRAH
$48.73Complete gasket sets include all necessary engine gaskets, o-rings and valve guide oil seals to rebuild a complete engine (do not include oil seals); sold each, Top-end gasket sets include all necessary top-end gaskets, o-rings and valve guide oil seals...VG453- SKU:
- VG453
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- SET
- PRODUCT NAME:
- GASKET
$48.73Qty in Cart: 0Quantity:Price:$48.73Subtotal: -
WSM Top-End Rebuild Kit - Platinum Series - Standard 010-841-10P
WSM
$391.70Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets01084110P- SKU:
- 01084110P
- Availability:
- Ships Same Business Day
- Weight:
- 4.80 LBS
- MODEL:
- PLATINUM SERIES
- PISTON SIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 79.87 MM
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
$391.70Qty in Cart: 0Quantity:Price:$391.70Subtotal: -
MOOSE RACING Circlip MSE72065K
MOOSE RACING
$3.95Made in the U.S.A.09130189- SKU:
- 09130189
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- CIRCLIP
- MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- PISTON
- UNITS:
- SET
$3.95Qty in Cart: 0Quantity:Price:$3.95Subtotal: -
MOOSE RACING Top End Gasket - CRF230 810242
MOOSE RACING
$70.76Moose can now handle all your gasket and seal needs at a fraction of OEM cost, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...09340070- SKU:
- 09340070
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$70.76Qty in Cart: 0Quantity:Price:$70.76Subtotal: -
VESRAH Intake Valve GG-2013-IN
VESRAH
$15.27Vesrah valves are precision manufactured from top-quality materials to match OEM valvesGG2013IN- SKU:
- GG2013IN
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- LENGTH METRIC:
- 93.80 MM
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- STEM DIAMETER METRIC:
- 6.00 MM
- HEAD DIAMETER:
- 34,00 MM
- HEAD DIAMETER METRIC:
- 34.00 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$15.27Qty in Cart: 0Quantity:Price:$15.27Subtotal: -
VESRAH Intake Valve GG-1040-IN
VESRAH
$32.81Vesrah valves are precision manufactured from top-quality materials to match OEM valves09262806- SKU:
- 09262806
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- HEAD DIAMETER METRIC:
- 28.50 MM
- LENGTH METRIC:
- 96.60 MM
- PRODUCT NAME:
- VALVE
- STEM DIAMETER METRIC:
- 5.50 MM
- APPLICATION:
- INTAKE
- HEAD DIAMETER:
- 28,50 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- 2 PIECE
$32.81Qty in Cart: 0Quantity:Price:$32.81Subtotal: -
VESRAH Top End Gasket Kit - DS/JR80 VG-7089
VESRAH
$40.00Complete gasket sets include all necessary engine gaskets, o-rings and valve guide oil seals to rebuild a complete engine (do not include oil seals); sold each, Top-end gasket sets include all necessary top-end gaskets, o-rings and valve guide oil seals...VG7089M- SKU:
- VG7089M
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- TOP END
- UNITS:
- SET
$40.00Qty in Cart: 0Quantity:Price:$40.00Subtotal: -
VESRAH Complete Gasket Kit - TS185 VG-351
VESRAH
$30.05Complete Gasket Set VG351 Comprehensive engine rebuild solution Includes all essential gaskets and o-rings Features valve guide oil seals for optimal performance Top-end gasket set available for targeted repairs Sold individually for...VG351- SKU:
- VG351
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- UNITS:
- SET
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$30.05Qty in Cart: 0Quantity:Price:$30.05Subtotal: -
VESRAH Complete Gasket Kit - DS/TS 125 VG-355
VESRAH
$44.14Complete Gasket Set VG355 Includes all essential engine gaskets for a full rebuild Contains o-rings and valve guide oil seals for optimal performance Top-end gasket sets designed for comprehensive top-end rebuilds Sold individually for...VG355- SKU:
- VG355
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- SET
$44.14Qty in Cart: 0Quantity:Price:$44.14Subtotal: -
VESRAH Complete Gasket Kit - ALT/JR/LT50 VG-392
VESRAH
$27.84Complete Gasket Sets VG392 Comprehensive engine rebuild solution with all necessary gaskets Includes high-quality o-rings for optimal sealing Features valve guide oil seals for enhanced engine performance Top-end gasket sets available...VG392- SKU:
- VG392
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- TYPE:
- COMPLETE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- SET
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$27.84Qty in Cart: 0Quantity:Price:$27.84Subtotal: -
On Sale
VESRAH Top End Gasket Kit - Yamaha 225 VG-6076-M
VESRAH
MSRP: $91.95Now: $61.00Was: $91.95Complete Gasket Set VG6076M Includes all essential engine gaskets for a full rebuild. Comes with o-rings and valve guide oil seals. Designed for complete engine restoration projects. Top-end gasket sets available for specific rebuild...VG6076- SKU:
- VG6076
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- ATV
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- SET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
MSRP: $91.95Now: $61.00Was: $91.95Qty in Cart: 0Quantity:Price:MSRP: $91.95Now: $61.00Was: $91.95Subtotal: -
POWERSTANDS RACING Case Saver/Sprocket Cover - Red 03-04152-24
POWERSTANDS RACING
$99.95Tough protection against broken chain from cracking engine cases, Machined lightweight design, Look so much better than stock cover, Replace OEM plastic sprocket cover, Anodized finish09500775- SKU:
- 09500775
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- RED
- PRODUCT NAME:
- CASE SAVER
- TYPE:
- ENGINE
- COLOR/FINISH:
- ANODIZED
- PRODUCT NAME:
- SPROCKET COVER
- UNITS:
- EACH
$99.95Qty in Cart: 0Quantity:Price:$99.95Subtotal:
