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 - Standard 010-831-10
WSM
$352.08A complete top-end rebuild requires precision-matched components that work in harmony—mismatched or worn parts will compromise ring seal, increase blowby, and tank your power output. The WSM Top-End Rebuild Kit delivers OEM-quality pistons paired with...01083110- SKU:
- 01083110
- Availability:
- Ships Same Business Day
- Weight:
- 3.20 LBS
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
- BORE SIZE METRIC:
- 65.00 MM
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- MODEL:
- ORIGINAL SERIES
- RIDING STYLE:
- WATERCRAFT
$352.08 -
WSM Piston Kit - Polaris - +.5 mm 010-832-05K
WSM
$98.28High-output piston kits demand precision engineering and thermal management that stock components simply can't deliver. The WSM +.5 mm Piston Kit brings OEM-matching quality with enhanced durability features specifically designed to handle the demands of...01083205- SKU:
- 01083205
- Availability:
- Ships Same Business Day
- Weight:
- 0.78 LBS
- RIDING STYLE:
- WATERCRAFT
- BORE SIZE METRIC:
- 81.00 MM
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- UNITS:
- KIT
$98.28 -
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 materials, eliminating guesswork during your engine refresh...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
$233.46 -
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 complete package, eliminating the guesswork of sourcing...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
$241.36 -
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 pistons, rings, and bearings into one complete solution,...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
$326.90 -
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 one package, eliminating the need to source individual...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 engine positioning and isolation, directly improving...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 positioning and isolation, eliminating excess movement...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 proper engine isolation and mounting geometry, eliminating...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 restores proper engine isolation and mounting geometry,...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 Mount (Y650/701 SJ) restores proper engine positioning...011115- SKU:
- 011115
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- MOUNT
- UNITS:
- EACH
- RIDING STYLE:
- WATERCRAFT
$58.37Qty in Cart: 0Quantity:Price:$58.37Subtotal: -
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 restores proper engine positioning, reduces NVH (noise,...011116- SKU:
- 011116
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- MOUNT
- UNITS:
- EACH
- TYPE:
- ENGINE
$66.72Qty in Cart: 0Quantity:Price:$66.72Subtotal: -
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 positioning and isolation, essential for maintaining...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 misalignment, accelerated wear on surrounding components,...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 precision fit and durability you need for reliable...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 leakage, which can lead to inconsistent air-fuel ratios and...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 emissions. Whether you're running a forced induction setup...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 WSM 011-213 delivers precision engineering with billet...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 engine's internal cleanliness. This WSM piece ensures 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
$14.34 -
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 24-1029 provides precision-engineered components designed...A241029- SKU:
- A241029
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- PRODUCT NAME:
- BEARING KIT
- UNITS:
- KIT
- TYPE:
- CRANK
- RIDING STYLE:
- OFF-ROAD
$91.95Qty in Cart: 0Quantity:Price:$91.95Subtotal:
