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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MOOSE RACING SEAL KIT COUNTERSHAFT BET 25-4047
MOOSE RACING
$25.95MOOSE RACING SEAL KIT COUNTERSHAFT BET09351195- SKU:
- 09351195
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL KIT
$25.95Qty in Cart: 0Quantity:Price:$25.95Subtotal: -
WINDEROSA Top End Gasket Kit - Kawasaki 440 610101
WINDEROSA
$46.75Includes bases and heads, along with intake and exhaust gaskets (only those nearest the block), Made in the U.S.A.PD812305- SKU:
- PD812305
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- UNITS:
- KIT
$46.75Qty in Cart: 0Quantity:Price:$46.75Subtotal: -
WINDEROSA Top End Gasket Kit - Kawasaki 550 610103
WINDEROSA
$50.03Includes bases and heads, along with intake and exhaust gaskets (only those nearest the block), Made in the U.S.A.PD812325- SKU:
- PD812325
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
$50.03 -
WINDEROSA Top End Gasket Kit - Raider 701 610602
WINDEROSA
$66.62Includes bases and heads, along with intake and exhaust gaskets (only those nearest the block), Made in the U.S.A.PD812532- SKU:
- PD812532
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$66.62Qty in Cart: 0Quantity:Price:$66.62Subtotal: -
WORKS CONNECTION Engine Plug - Blue 24-490
WORKS CONNECTION
$31.95Precision-machined from 6061-T6 aluminum, Simple positive installation with an Allen wrench, Set of two plugs replaces the stock plugs, Polished to a mirror finish prior to anodizing, resulting in a brilliant look, Made in the U.S.A.09500854- SKU:
- 09500854
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- STREET
- TYPE:
- ENGINE
- UNITS:
- SET
- COLOR/FINISH:
- BLUE
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- 6061 T-6 ALUMINUM
- COLOR/FINISH:
- ANODIZED
- PRODUCT NAME:
- PLUG
$31.95Qty in Cart: 0Quantity:Price:$31.95Subtotal: -
WINDEROSA Gasket - Complete - JS800SXR 611409
WINDEROSA
$127.95WINDEROSA Gasket - Complete - JS800SXR09346560- SKU:
- 09346560
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- COMPLETE
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- ENGINE
- UNITS:
- KIT
$127.95Qty in Cart: 0Quantity:Price:$127.95Subtotal: -
WINDEROSA Standard Bore Gasket Kit 810213
WINDEROSA
$62.95Ready-to-install, direct bolt-on cylinders require no re-plating and look virtually identical to the OEM cylinders, Cylinder kits include matched Vertex pistons to ensure longevity, performance and reduced engine noise, Nickel Silicon Carbide plated for...09341930- SKU:
- 09341930
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE SIZE METRIC:
- 66.00 MM
- PRODUCT NAME:
- GASKET KIT
- STYLE:
- STANDARD
- TYPE:
- TOP END
- MATERIAL:
- NICKEL SILICON CARBIDE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$62.95Qty in Cart: 0Quantity:Price:$62.95Subtotal: -
WINDEROSA Jet Pump Seal Kit 623116
WINDEROSA
$15.03WINDEROSA Jet Pump Seal Kit09351122- SKU:
- 09351122
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- JET PUMP
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- PRODUCT NAME:
- SEAL
$15.03Qty in Cart: 0Quantity:Price:$15.03Subtotal: -
WINDEROSA Gasket - Complete - JT1500 Ultra 611420
WINDEROSA
$362.94WINDEROSA Gasket - Complete - JT1500 Ultra09346564- SKU:
- 09346564
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- COMPLETE
- UNITS:
- KIT
- TYPE:
- ENGINE
$362.94Qty in Cart: 0Quantity:Price:$362.94Subtotal: -
WINDEROSA Gasket Kit - Standard Bore 810373
WINDEROSA
$66.08Made in the U.S.A.09346009- SKU:
- 09346009
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE SIZE IMPERIAL:
- STANDARD
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CYLINDER
- UNITS:
- KIT
$66.08 -
WORKS CONNECTION Engine Timing Plug - Red - Honda 24-508
WORKS CONNECTION
$46.95Precision-machined from 6061 T-6 aluminum, Simple positive installation with an Allen wrench, Set of two plugs replaces the stock plugs, Polished to a mirror finish prior to anodizing, resulting in a brilliant look, Anodized finish, Made in the U.S.A.09500092- SKU:
- 09500092
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- COLOR/FINISH:
- ANODIZED
- MATERIAL:
- 6061 T-6 ALUMINUM
- COLOR/FINISH:
- RED
- TYPE:
- ENGINE
- UNITS:
- SET
- PRODUCT NAME:
- PLUG
- RIDING STYLE:
- OFF-ROAD
$46.95Qty in Cart: 0Quantity:Price:$46.95Subtotal: -
MOOSE RACING Ring Set - For 95.5 mm Piston CPN2-2-3759
MOOSE RACING
$35.95Made in the U.S.A., Be sure to use race fuel with some applications09120242- SKU:
- 09120242
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- PISTON SIZE METRIC:
- STANDARD
- RIDING STYLE:
- ATV
- UNITS:
- SET
$35.95Qty in Cart: 0Quantity:Price:$35.95Subtotal: -
MOOSE RACING Crankcase Bearing and Seal Kit 24-1008
MOOSE RACING
$83.95Precision crank bearings, Kits contain right and left crankshaft bearings; 2-stroke kits contain outer seals, Seals designed with a fluorocarbon lip to reduce dry start friction on 2-stroke engines, 4-stroke crank bearings do not include sealsA241008- SKU:
- A241008
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- PRODUCT NAME:
- BEARING KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- CRANK
$83.95Qty in Cart: 0Quantity:Price:$83.95Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - 125SX 811330
MOOSE RACING
$115.35Moose 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...09341268- SKU:
- 09341268
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- TYPE:
- COMPLETE
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
$115.35 -
TMV Flywheel Weight 310FW1311
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 spacers09220088- SKU:
- 09220088
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- FEATURES:
- FLYWHEEL WEIGHT - 11 OZ.
- PRODUCT NAME:
- FLYWHEEL WEIGHT
- MATERIAL:
- 303 STAINLESS STEEL
$181.95Qty in Cart: 0Quantity:Price:$181.95Subtotal: -
TMV Flywheel Weight 310FW4113
TMV
$166.95Machined from 303 stainless steel that's 15% heavier than standard steel, allowing more mass in a smaller space, No extra gaskets or leaking plastic spacers09220098- SKU:
- 09220098
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- PRODUCT NAME:
- FLYWHEEL WEIGHT
- FEATURES:
- FLYWHEEL WEIGHT - 13 OZ.
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- 303 STAINLESS STEEL
- UNITS:
- EACH
$166.95Qty in Cart: 0Quantity:Price:$166.95Subtotal: -
TMV Flywheel Weight 310FW2209
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 spacers09220099- SKU:
- 09220099
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- UNITS:
- EACH
- FEATURES:
- FLYWHEEL WEIGHT - 9 OZ.
- PRODUCT NAME:
- FLYWHEEL WEIGHT
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- 303 STAINLESS STEEL
$152.95Qty in Cart: 0Quantity:Price:$152.95Subtotal: -
TMV Flywheel Weight 310FW2211
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 spacers09220100- SKU:
- 09220100
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- FEATURES:
- FLYWHEEL WEIGHT - 11 OZ.
- MATERIAL:
- 303 STAINLESS STEEL
- PRODUCT NAME:
- FLYWHEEL WEIGHT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$152.95Qty in Cart: 0Quantity:Price:$152.95Subtotal: -
TMV Flywheel Weight 310FW3113
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 spacers09220108- SKU:
- 09220108
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- PRODUCT NAME:
- FLYWHEEL WEIGHT
- FEATURES:
- FLYWHEEL WEIGHT - 13 OZ.
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- 303 STAINLESS STEEL
- UNITS:
- EACH
$152.95Qty in Cart: 0Quantity:Price:$152.95Subtotal: -
MOOSE RACING Inner Clutch Cover Gasket 816213
MOOSE RACING
$12.47Moose 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...09346127- SKU:
- 09346127
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$12.47Qty in Cart: 0Quantity:Price:$12.47Subtotal:
