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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On Sale
Wossner 54mm Piston Kit for 1981-1984 Suzuki RM125 8124DA
WOSSNER
MSRP: $132.00Now: $125.40Was: $132.00Your RM125's piston is the heart of combustion—when it wears, you lose compression, power, and responsiveness. The Wossner 8124DA replaces worn pistons with German-engineered precision, restoring the...09105541- SKU:
- 09105541
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 54.00 MM
- TYPE:
- DUAL RING
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 124 CC
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 53.94 MM
- PRODUCT NAME:
- PISTON KIT
MSRP: $132.00Now: $125.40Was: $132.00Qty in Cart: 0Quantity:Price:MSRP: $132.00Now: $125.40Was: $132.00Subtotal: -
WSM Ring Set 010-925-07
WSM
$23.31Piston ring sets are the backbone of engine sealing and combustion efficiency—they maintain compression, control oil consumption, and directly impact horsepower delivery and engine longevity. The WSM...09120081- SKU:
- 09120081
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- PISTON RING
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- SET
- BORE - OVERSIZE:
- +1,00 MM
$23.31Qty in Cart: 0Quantity:Price:$23.31Subtotal: -
WSM Crankshaft Assembly 010-1018-01WSM
WSM
$810.90A crankshaft assembly is the heart of your engine's power delivery—it converts reciprocating motion into rotational force with precision that directly impacts horsepower, reliability, and longevity...09210226- SKU:
- 09210226
- Availability:
- Ships Same Business Day
- Weight:
- 25.30 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MATERIAL:
- STEEL
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$810.90Qty in Cart: 0Quantity:Price:$810.90Subtotal: -
WSM Crankshaft Assembly 010-1019-01WSM
WSM
$803.20A quality crankshaft assembly is the foundation of engine reliability and performance—any compromise here directly impacts power delivery, longevity, and overall engine stability. The WSM Crankshaft...09210228- SKU:
- 09210228
- Availability:
- Ships Same Business Day
- Weight:
- 28.59 LBS
- MATERIAL:
- STEEL
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- RIDING STYLE:
- WATERCRAFT
$803.20 -
WSM Crankshaft Assembly 010-1025WSM
WSM
$754.95A reliable crankshaft assembly is the backbone of any high-performance engine—it's where combustion force converts to rotational power. The WSM 010-1025WSM delivers OEM-equivalent performance with...09210229- SKU:
- 09210229
- Availability:
- Ships Same Business Day
- Weight:
- 20.60 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- RIDING STYLE:
- WATERCRAFT
- MATERIAL:
- STEEL
- UNITS:
- KIT
$754.95 -
WSM Piston Assembly - Yamaha - Standard 010-871K
WSM
$100.50Stock pistons don't cut it when you're pushing your Yamaha to the limit—heat buildup and friction rob you of power and longevity. WSM's piston assembly delivers OEM-matched quality with engineered...09101984- SKU:
- 09101984
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 75.90 MM
- MODEL:
- ORIGINAL
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
$100.50Qty in Cart: 0Quantity:Price:$100.50Subtotal: -
WSM Piston Assembly - Sea-Doo - +1 mm 010-818-07PK
WSM
$93.60Whether you're chasing lap times or rebuilding after a season of hard use, piston quality directly impacts your Sea-Doo's reliability and power output. The WSM +1 mm 010 piston assembly delivers...09101263- SKU:
- 09101263
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 82.00 MM
- MODEL:
- PLATINUM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$93.60Qty in Cart: 0Quantity:Price:$93.60Subtotal: -
WSM Top-End Rebuild Kit - Platinum Series - Standard 010-808-10P
WSM
$238.39A complete top-end rebuild demands precision components engineered to exact tolerances—this kit eliminates the guesswork by pairing OEM-quality pistons with matched rings, pins, and clips that work...09030743- SKU:
- 09030743
- Availability:
- Ships Same Business Day
- Weight:
- 3.45 LBS
- MODEL:
- PLATINUM SERIES
- PISTON MATERIAL:
- ALUMINUM
- PISTON SIZE METRIC:
- STANDARD
- UNITS:
- EACH
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- WATERCRAFT
- BORE SIZE METRIC:
- 82.00 MM
- TYPE:
- TOP END
$238.39Qty in Cart: 0Quantity:Price:$238.39Subtotal: -
WSM Top-End Rebuild Kit - Platinum Series - 1 mm 010-809-14P
WSM
$323.56A top-end rebuild is non-negotiable when you're chasing maximum power and reliability. The WSM Platinum Series gives you OEM-quality components engineered to tight tolerances, so you can confidently...09030748- SKU:
- 09030748
- Availability:
- Ships Same Business Day
- Weight:
- 4.10 LBS
- BORE SIZE METRIC:
- 88.91 MM
- PISTON MATERIAL:
- ALUMINUM
- MODEL:
- PLATINUM SERIES
- PISTON SIZE METRIC:
- +1.00 MM
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
$323.56Qty in Cart: 0Quantity:Price:$323.56Subtotal: -
XCELDYNE Valve Spring Bucket XBT13101
XCELDYNE
$140.49If you're running high-lift cams and pushing higher RPMs, stock valve spring buckets become your weak point—introducing unwanted valve float, cylinder head wear, and lost power. The XCELDYNE XBT13101...09260623- SKU:
- 09260623
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- SPRING BUCKET
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- MATERIAL:
- STEEL
$140.49Qty in Cart: 0Quantity:Price:$140.49Subtotal: -
On Sale
ATHENA Water Pump Gasket Kit Honda P400210475013
ATHENA
MSRP: $30.95Now: $28.00Was: $30.95Water pump gasket failure compromises your cooling system's integrity, risking overheating and catastrophic engine damage. The ATHENA P400210475013 kit provides OEM-specification gaskets and seals...09346372- SKU:
- 09346372
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- WATER PUMP
MSRP: $30.95Now: $28.00Was: $30.95Qty in Cart: 0Quantity:Price:MSRP: $30.95Now: $28.00Was: $30.95Subtotal: -
On Sale
ATHENA Water Pump Gasket Kit Honda P400210475015
ATHENA
MSRP: $27.95Now: $25.00Was: $27.95Gasket and seal failure is one of the most common causes of coolant leaks and oil seepage in Honda engines, leading to overheating and potential engine damage if left unaddressed. The ATHENA Water...09346374- SKU:
- 09346374
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $27.95Now: $25.00Was: $27.95Qty in Cart: 0Quantity:Price:MSRP: $27.95Now: $25.00Was: $27.95Subtotal: -
On Sale
ATHENA Water Pump Gasket Kit KTM/Husqvarna P400270475021
ATHENA
MSRP: $50.95Now: $46.00Was: $50.95Coolant leaks and seal failures compromise engine reliability and performance, especially in high-demand riding conditions. The ATHENA Water Pump Gasket Kit delivers OEM-quality sealing components...09346382- SKU:
- 09346382
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- TYPE:
- WATER PUMP
MSRP: $50.95Now: $46.00Was: $50.95Qty in Cart: 0Quantity:Price:MSRP: $50.95Now: $46.00Was: $50.95Subtotal:
