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
$335.31Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets01083110- 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
$335.31 -
WSM Piston Kit - Polaris - +.5 mm 010-832-05K
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...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
$93.60 -
WSM Top-End Rebuild Kit - Original Series - .25 mm 010-832-11
WSM
$229.87Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets01083211- 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
$229.87 -
WSM Top-End Rebuild Kit - Original Series - .50 mm 010-832-12
WSM
$229.87Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets01083212- 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
$229.87 -
WSM Top-End Rebuild Kit - Original Series - .25 mm 010-832-21
WSM
$326.90Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets01083221- 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
$333.44Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets01083222- 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
$333.44 -
WSM Motor Mount - K440/550 011-104
WSM
$36.26Replacements for broken or worn-out OEM motor mounts011104- SKU:
- 011104
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- MOUNT
- UNITS:
- EACH
$36.26 -
WSM Motor Mount - K650/750 011-105
WSM
$48.69Replacements for broken or worn-out OEM motor mounts011105- SKU:
- 011105
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- MOUNT
- UNITS:
- EACH
- RIDING STYLE:
- WATERCRAFT
$48.69 -
WSM Motor Mount - S580/720 011-107
WSM
$31.96Replacements for broken or worn-out OEM motor mounts011107- SKU:
- 011107
- Availability:
- Ships Same Business Day
- Weight:
- 0.32 LBS
- PRODUCT NAME:
- MOUNT
- TYPE:
- ENGINE
- UNITS:
- EACH
- RIDING STYLE:
- WATERCRAFT
$31.96 -
WSM Motor Mount - S800 FRT 011-108
WSM
$50.32Replacements for broken or worn-out OEM motor mounts011108- SKU:
- 011108
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- MOUNT
- UNITS:
- EACH
- TYPE:
- ENGINE
$50.32 -
WSM Motor Mount - Y650/701 SJ 011-115
WSM
$43.49Replacements for broken or worn-out OEM motor mounts011115- SKU:
- 011115
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- MOUNT
- UNITS:
- EACH
- RIDING STYLE:
- WATERCRAFT
$43.49 -
WSM Motor Mount - Y701/760 011-116
WSM
$47.33Replacements for broken or worn-out OEM motor mounts011116- SKU:
- 011116
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- MOUNT
- UNITS:
- EACH
- TYPE:
- ENGINE
$47.33 -
WSM Motor Mount - Y500/650/701 011-117
WSM
$47.33Replacements for broken or worn-out OEM motor mounts011117- SKU:
- 011117
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- PRODUCT NAME:
- MOUNT
- TYPE:
- ENGINE
- UNITS:
- EACH
- RIDING STYLE:
- WATERCRAFT
$47.33 -
WSM Motor Mount - GP1200R 011-126
WSM
$60.02Replacements for broken or worn-out OEM motor mounts011126- SKU:
- 011126
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- MOUNT
- UNITS:
- EACH
$60.02 -
WSM Crank Case Block Off Plate 011-208
WSM
$13.68Top-quality billet aluminum construction, Washers not included011208- 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
$13.68 -
WSM Crankcase Block-off Plate - 650/750 011-210
WSM
$14.07Covers the case breather port, CNC-machined from top-quality billet aluminum011210- 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
$14.07 -
WSM Crank Case Block Off Plate 011-212
WSM
$13.68Top-quality billet aluminum construction, Washers not included011212- 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
$13.68Qty in Cart: 0Quantity:Price:$13.68Subtotal: -
WSM Crank Case Block Off Plate 011-213
WSM
$13.68Top-quality billet aluminum construction, Washers not included011213- 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
$13.68 -
WSM Crank Case Block Off Plate 011-216
WSM
$13.66Top-quality billet aluminum construction, Washers not included011216- 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
$13.66 -
MOOSE RACING Crankcase Bearing and Seal Kit 24-1029
MOOSE RACING
$91.95Precision 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 sealsA241029- 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
