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
-
MOOSE RACING Valve Cover Gasket - Kawasaki 817917
MOOSE RACING
$25.54MOOSE RACING Valve Cover Gasket - Kawasaki09346899- SKU:
- 09346899
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- TYPE:
- VALVE COVER
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$25.54 -
MOOSE RACING Complete Motor Gasket Kit - RMZ450/RMX450 808595
MOOSE RACING
$142.88Moose 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...09341897- SKU:
- 09341897
- Availability:
- Ships Same Business Day
- Weight:
- 0.59 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
$142.88 -
MOOSE RACING Motor Gasket Kit with Seal - RMZ450 811595
MOOSE RACING
$173.88Moose can now handle all your gasket and seal needs at a fraction of OEM cost, Rebuild the engine and transmission with total confidence as each set is designed for durability and accurate fit, Oil seals are genuine OEM replacement seals, Sets include...09341898- SKU:
- 09341898
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$173.88 -
MOOSE RACING Ignition Cover Gasket 816693
MOOSE RACING
$7.85Moose can now handle all your gasket and seal needs at a fraction of OEM cost, Rebuild the engine and transmission with total confidence as each set is designed for durability and accurate fit, Oil seals are genuine OEM replacement seals, These...09341899- SKU:
- 09341899
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- TYPE:
- IGNITION COVER
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$7.85 -
MOOSE RACING Clutch Cover Gasket 816701
MOOSE RACING
$11.50Moose can now handle all your gasket and seal needs at a fraction of OEM cast, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmissions with total confidence as each set is designed for durability and...09341900- SKU:
- 09341900
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$11.50 -
MOOSE RACING Cylinder - Standard - KX250F MSE30012
MOOSE RACING
$402.95Replace your damaged or worn OEM cylinder, Made from cast aluminum; nickel silicon carbide plated, Precision-machined and honed to OEM stock bore sizes, Extremely durable low-friction bore surface allows for greater heat dissipation, Stock OEM...09310881- SKU:
- 09310881
- Availability:
- Ships Same Business Day
- Weight:
- 2.50 LBS
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- CAST
- PRODUCT NAME:
- CYLINDER
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- MATERIAL:
- ALUMINUM
- UNITS:
- EACH
$402.95 -
MOOSE RACING Cylinder - Standard - YZ450F MSECW20012
MOOSE RACING
$427.95Replace your damaged or worn OEM cylinder, Made from cast aluminum; nickel silicon carbide plated, Precision-machined and honed to OEM stock bore sizes, Extremely durable low-friction bore surface allows for greater heat dissipation, Stock OEM...09310882- SKU:
- 09310882
- Availability:
- Ships Same Business Day
- Weight:
- 3.35 LBS
- COLOR/FINISH:
- GRAY
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 97.00 MM
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- STANDARD
- MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- CYLINDER DIAMETER:
- 97,00 MM
- ENGINE TYPE:
- 4-CYCLE
- MATERIAL:
- CAST
- PRODUCT NAME:
- CYLINDER
- DISPLACEMENT:
- 450 CC
$427.95 -
MOOSE RACING Cylinder - Standard - Suzuki MSECW40005
MOOSE RACING
$358.95Replace your damaged or worn OEM cylinder, Made from cast aluminum; nickel silicon carbide plated, Precision-machined and honed to OEM stock bore sizes, Extremely durable low-friction bore surface allows for greater heat dissipation, Stock OEM...09310974- SKU:
- 09310974
- Availability:
- Ships Same Business Day
- Weight:
- 2.36 LBS
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- UNITS:
- EACH
- CYLINDER DIAMETER:
- 77,00 MM
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- STANDARD
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- DISPLACEMENT:
- 250 CC
- MATERIAL:
- ALUMINUM
- COLOR/FINISH:
- GRAY
- ENGINE TYPE:
- 4-CYCLE
- MATERIAL:
- CAST
$358.95 -
MOOSE RACING Top End Gasket Kit - RMZ250 810568
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...09341269- SKU:
- 09341269
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$70.76 -
MOOSE RACING Complete Motor Gasket Kit - YZ250 808669
MOOSE RACING
$58.21Moose 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...09341517- SKU:
- 09341517
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$58.21 -
MOOSE RACING Ignition Cover Gasket 816677
MOOSE RACING
$10.64Moose can now handle all your gasket and seal needs at a fraction of OEM cost, Rebuild the engine and transmission with total confidence as each set is designed for durability and accurate fit, Oil seals are genuine OEM replacement seals, These...09341459- SKU:
- 09341459
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- TYPE:
- IGNITION COVER
$10.64 -
On Sale
TMV Camchain Tensioner 138361060
TMV
MSRP: $110.95Now: $72.00Was: $110.95TMV Camchain Tensioner09220177- SKU:
- 09220177
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- TENSIONER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CAM CHAIN
MSRP: $110.95Now: $72.00Was: $110.95 -
TMV Flywheel Weight 310FW1211
TMV
$152.95Machined from 303 stainless steel that's 15% heavier than standard steel, allowing more mass in a smaller space, No extra gaskets or leaking plastic spacers09220085- SKU:
- 09220085
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- FEATURES:
- FLYWHEEL WEIGHT - 11 OZ.
- PRODUCT NAME:
- FLYWHEEL WEIGHT
- MATERIAL:
- 303 STAINLESS STEEL
$152.95Qty in Cart: 0Quantity:Price:$152.95Subtotal: -
TMV Flywheel Weight 310FW1213
TMV
$152.95Machined from 303 stainless steel that's 15% heavier than standard steel, allowing more mass in a smaller space, No extra gaskets or leaking plastic spacers09220086- SKU:
- 09220086
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- FEATURES:
- FLYWHEEL WEIGHT - 13 OZ.
- UNITS:
- EACH
- PRODUCT NAME:
- FLYWHEEL WEIGHT
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- 303 STAINLESS STEEL
$152.95 -
TMV Flywheel Weight 310FW1313
TMV
$181.95Machined from 303 stainless steel that's 15% heavier than standard steel, allowing more mass in a smaller space, No extra gaskets or leaking plastic spacers09220089- SKU:
- 09220089
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- MATERIAL:
- 303 STAINLESS STEEL
- FEATURES:
- FLYWHEEL WEIGHT - 13 OZ.
- PRODUCT NAME:
- FLYWHEEL WEIGHT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$181.95 -
TMV Flywheel Weight 310FW5109
TMV
$152.95Machined from 303 stainless steel that's 15% heavier than standard steel, allowing more mass in a smaller space, No extra gaskets or leaking plastic spacers09220090- SKU:
- 09220090
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- MATERIAL:
- 303 STAINLESS STEEL
- UNITS:
- EACH
- FEATURES:
- FLYWHEEL WEIGHT - 9 OZ.
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- FLYWHEEL WEIGHT
$152.95 -
TMV Flywheel Weight 310FW5111
TMV
$152.95Machined from 303 stainless steel that's 15% heavier than standard steel, allowing more mass in a smaller space, No extra gaskets or leaking plastic spacers09220091- SKU:
- 09220091
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- FEATURES:
- FLYWHEEL WEIGHT - 11 OZ.
- MATERIAL:
- 303 STAINLESS STEEL
- PRODUCT NAME:
- FLYWHEEL WEIGHT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$152.95 -
TMV Flywheel Weight 310FW5113
TMV
$152.95Machined from 303 stainless steel that's 15% heavier than standard steel, allowing more mass in a smaller space, No extra gaskets or leaking plastic spacers09220092- SKU:
- 09220092
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- MATERIAL:
- 303 STAINLESS STEEL
- PRODUCT NAME:
- FLYWHEEL WEIGHT
- RIDING STYLE:
- OFF-ROAD
- FEATURES:
- FLYWHEEL WEIGHT - 13 OZ.
- UNITS:
- EACH
$152.95 -
TMV Flywheel Weight 310FW2213
TMV
$152.95Machined from 303 stainless steel that's 15% heavier than standard steel, allowing more mass in a smaller space, No extra gaskets or leaking plastic spacers09220101- SKU:
- 09220101
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
- MATERIAL:
- 303 STAINLESS STEEL
- PRODUCT NAME:
- FLYWHEEL WEIGHT
- FEATURES:
- FLYWHEEL WEIGHT - 13 OZ.
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$152.95 -
TMV Camchain Tensioner - Blue 138101012BU
TMV
$108.95Removes excess slack in the timing chain to prevent damage to the pistons and valves09251322- SKU:
- 09251322
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- BASE COLOR:
- BLUE
- PRODUCT NAME:
- CAM CHAIN TENSIONER
$108.95
