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 - .25 mm 010-832-11
WSM
$233.46A top-end rebuild demands precision components that withstand extreme combustion pressures and sustained RPM loads. The WSM Original Series kit delivers OEM-equivalent quality with race-proven...01083211- SKU:
- 01083211
- Availability:
- Ships Same Business Day
- Weight:
- 3.20 LBS
- BORE - OVERSIZE:
- +0,25 MM
- BORE SIZE METRIC:
- 81.25 MM
- UNITS:
- EACH
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE METRIC:
- +0.25 MM
$233.46Qty in Cart: 0Quantity:Price:$233.46Subtotal: -
WSM Top-End Rebuild Kit - Original Series - .50 mm 010-832-12
WSM
$241.36A top-end rebuild demands precision components that restore your engine to factory specifications—or better. The WSM Original Series Kit delivers OEM-quality pistons, rings, and bearings in one...01083212- SKU:
- 01083212
- Availability:
- Ships Same Business Day
- Weight:
- 2.94 LBS
- BORE SIZE METRIC:
- 81.50 MM
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- PISTON SIZE METRIC:
- +0.50 MM
- UNITS:
- EACH
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
$241.36Qty in Cart: 0Quantity:Price:$241.36Subtotal: -
WSM Top-End Rebuild Kit - Original Series - .25 mm 010-832-21
WSM
$326.90A top-end rebuild demands precision components that can withstand extreme combustion pressures and sustained RPM loads. The WSM Original Series kit eliminates guesswork by bundling OEM-quality...01083221- SKU:
- 01083221
- Availability:
- Ships Same Business Day
- Weight:
- 4.30 LBS
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- PISTON SIZE METRIC:
- +0.25 MM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 81.25 MM
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
$326.90Qty in Cart: 0Quantity:Price:$326.90Subtotal: -
WSM Top-End Rebuild Kit - Original Series - .50 mm 010-832-22
WSM
$326.90A complete top-end rebuild demands precision components that restore your engine to factory specifications or beyond. The WSM Original Series kit delivers OEM-quality pistons, rings, and gaskets in...01083222- SKU:
- 01083222
- Availability:
- Ships Same Business Day
- Weight:
- 4.13 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 81.50 MM
- MODEL:
- ORIGINAL SERIES
- PISTON SIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- WATERCRAFT
$326.90 -
WSM Motor Mount - K440/550 011-104
WSM
$58.37Worn or broken motor mounts compromise engine stability, increase vibration transfer to the chassis, and can accelerate damage to surrounding components. A quality replacement mount restores proper...011104- SKU:
- 011104
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- MOUNT
- UNITS:
- EACH
$58.37 -
WSM Motor Mount - K650/750 011-105
WSM
$58.37Worn or cracked motor mounts compromise engine stability, increase vibration transfer to the chassis, and can accelerate damage to surrounding components. The WSM Motor Mount restores proper engine...011105- SKU:
- 011105
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- MOUNT
- UNITS:
- EACH
- RIDING STYLE:
- WATERCRAFT
$58.37 -
WSM Motor Mount - S580/720 011-107
WSM
$58.37Worn or cracked motor mounts compromise engine stability, increase vibration transfer to the chassis, and can accelerate damage to surrounding components. The WSM Motor Mount (011-107) restores...011107- SKU:
- 011107
- Availability:
- Ships Same Business Day
- Weight:
- 0.32 LBS
- PRODUCT NAME:
- MOUNT
- TYPE:
- ENGINE
- UNITS:
- EACH
- RIDING STYLE:
- WATERCRAFT
$58.37 -
WSM Motor Mount - S800 FRT 011-108
WSM
$75.07Worn or cracked motor mounts compromise engine stability, increase vibration transfer to the chassis, and can lead to costly drivetrain damage if left unaddressed. The WSM Motor Mount S800 FRT...011108- SKU:
- 011108
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- MOUNT
- UNITS:
- EACH
- TYPE:
- ENGINE
$75.07 -
WSM Motor Mount - Y650/701 SJ 011-115
WSM
$58.37Worn or broken motor mounts compromise engine stability, increase vibration transfer to the chassis, and can lead to misalignment issues that affect handling and drivetrain longevity. The WSM Motor...011115- SKU:
- 011115
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- MOUNT
- UNITS:
- EACH
- RIDING STYLE:
- WATERCRAFT
$58.37 -
WSM Motor Mount - Y701/760 011-116
WSM
$66.72Worn or broken motor mounts compromise engine stability, transmit excessive vibration into the cabin, and can lead to misalignment of engine accessory belts and hoses. A quality replacement mount...011116- SKU:
- 011116
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- MOUNT
- UNITS:
- EACH
- TYPE:
- ENGINE
$66.72 -
WSM Motor Mount - Y500/650/701 011-117
WSM
$66.72Worn or broken motor mounts compromise engine stability, increase vibration transfer to the chassis, and can accelerate damage to surrounding components. The WSM Motor Mount restores proper engine...011117- SKU:
- 011117
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- PRODUCT NAME:
- MOUNT
- TYPE:
- ENGINE
- UNITS:
- EACH
- RIDING STYLE:
- WATERCRAFT
$66.72 -
WSM Motor Mount - GP1200R 011-126
WSM
$83.42Motor mounts are critical chassis components that isolate engine vibration and maintain proper engine geometry under load. Worn or damaged OEM mounts allow excessive movement, leading to driveline...011126- SKU:
- 011126
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- MOUNT
- UNITS:
- EACH
$83.42 -
WSM Crank Case Block Off Plate 011-208
WSM
$14.36A crank case block off plate is essential for any forced induction setup, preventing unwanted blow-by gases from escaping and maintaining proper crankcase pressure. The WSM 011-208 delivers the...011208- SKU:
- 011208
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- ELIMINATION KIT
- TYPE:
- OIL INJECTION
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BILLET ALUMINUM
- UNITS:
- KIT
- BASE COLOR:
- BLACK
$14.36 -
WSM Crankcase Block-off Plate - 650/750 011-210
WSM
$14.77A properly sealed crankcase is essential for maintaining crankcase pressure and preventing oil contamination in high-performance engines. This block-off plate eliminates unwanted breather port...011210- SKU:
- 011210
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- COLOR/FINISH:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- BASE COLOR:
- SILVER
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PLATE
- TYPE:
- BLOCK-OFF
$14.77 -
WSM Crank Case Block Off Plate 011-212
WSM
$14.36A crankcase block off plate eliminates vacuum leaks and prevents oil vapor from escaping your engine's crankcase ventilation system, directly improving combustion efficiency and reducing unwanted...011212- SKU:
- 011212
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- BILLET ALUMINUM
- PRODUCT NAME:
- ELIMINATION KIT
- TYPE:
- OIL INJECTION
- BASE COLOR:
- BLACK
- RIDING STYLE:
- WATERCRAFT
- COLOR/FINISH:
- BLACK
- UNITS:
- KIT
$14.36 -
WSM Crank Case Block Off Plate 011-213
WSM
$14.36A quality crankcase block off plate prevents atmospheric contamination and oil vapors from entering your engine's intake system, maintaining cleaner combustion and more consistent performance. The...011213- SKU:
- 011213
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- TYPE:
- CRANKCASE
- MATERIAL:
- BILLET ALUMINUM
- PRODUCT NAME:
- PLATE
- COLOR/FINISH:
- BLACK
- UNITS:
- KIT
- BASE COLOR:
- BLACK
- RIDING STYLE:
- WATERCRAFT
$14.36 -
WSM Crank Case Block Off Plate 011-216
WSM
$14.34A crankcase block off plate eliminates vacuum leak pathways and prevents oil vapors from escaping through unused ports—essential for maintaining proper PCV system function and protecting your...011216- SKU:
- 011216
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- BASE COLOR:
- BLACK
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- MATERIAL:
- BILLET ALUMINUM
- PRODUCT NAME:
- ELIMINATION KIT
- TYPE:
- OIL INJECTION
$14.34Qty in Cart: 0Quantity:Price:$14.34Subtotal: -
MOOSE RACING Crankcase Bearing and Seal Kit 24-1029
MOOSE RACING
$91.95A failing crankshaft bearing or seal will compromise engine reliability and performance—two things you can't afford to sacrifice on track or trail. The MOOSE RACING Crankcase Bearing and Seal Kit...A241029- SKU:
- A241029
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- PRODUCT NAME:
- BEARING KIT
- UNITS:
- KIT
- TYPE:
- CRANK
- RIDING STYLE:
- OFF-ROAD
$91.95 -
MOOSE RACING Crankcase Bearing and Seal Kit 24-1030
MOOSE RACING
$83.95A quality crankcase bearing and seal kit is foundational to reliable engine performance—worn bearings introduce play, noise, and premature wear that cascades through your entire drivetrain. The MOOSE...A241030- SKU:
- A241030
- Availability:
- Ships Same Business Day
- Weight:
- 1.48 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CRANK
- UNITS:
- KIT
- PRODUCT NAME:
- BEARING KIT
$83.95 -
MOOSE RACING Crank Bearing - XR/TRX 24-1031
MOOSE RACING
$37.95Your 2-stroke engine's crankshaft depends on precision bearings to handle extreme rotational forces—and worn or inadequate bearings will cost you performance and reliability. The MOOSE RACING Crank...A241031- SKU:
- A241031
- Availability:
- Ships Same Business Day
- Weight:
- 0.68 LBS
- RIDING STYLE:
- ATV
- APPLICATION:
- CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- BEARING
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- TYPE:
- BALL
$37.95
