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
-
WSM Piston Assembly - Sea-Doo - Standard 010-861PK
WSM
$133.96Quality 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...09101272- SKU:
- 09101272
- Availability:
- Ships Same Business Day
- Weight:
- 1.60 LBS
- BORE - OVERSIZE:
- STANDARD
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 99.96 MM
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- MODEL:
- PLATINUM
- PRODUCT NAME:
- PISTON KIT
$133.96 -
WSM Piston Assembly - Sea-Doo - Standard 010-862K
WSM
$230.74Quality 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...09101274- SKU:
- 09101274
- Availability:
- Ships Same Business Day
- Weight:
- 1.28 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 99.96 MM
- UNITS:
- KIT
- MODEL:
- PLATINUM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
$230.74 -
WSM Piston Assembly - Sea-Doo - +.5 mm 010-862-05K
WSM
$230.74Quality 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...09101275- SKU:
- 09101275
- Availability:
- Ships Same Business Day
- Weight:
- 1.28 LBS
- MODEL:
- PLATINUM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- +0,50 MM
- BORE SIZE METRIC:
- 99.96 MM
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
$230.74 -
WSM Piston Kit - Kawasaki - +1 mm 010-843-07K
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...09100651- SKU:
- 09100651
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- MODEL:
- ORIGINAL
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 82.00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$93.60 -
WSM Piston Kit - Polaris - Standard 010-835K
WSM
$85.08Quality 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...09100655- SKU:
- 09100655
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 84.00 MM
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
$85.08 -
WSM Piston Kit - Polaris - +.5 mm 010-835-05K
WSM
$85.08Quality 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...09100656- SKU:
- 09100656
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- +0,50 MM
- BORE SIZE METRIC:
- 84.00 MM
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
$85.08 -
WSM Piston Kit - Polaris - +1 mm 010-835-07K
WSM
$85.08Quality 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...09100657- SKU:
- 09100657
- Availability:
- Ships Same Business Day
- Weight:
- 1.32 LBS
- MODEL:
- ORIGINAL
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 84.00 MM
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- PISTON KIT
$85.08 -
WSM Piston Kit - Yamaha - Standard 010-827K
WSM
$76.57Quality 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...09100659- SKU:
- 09100659
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- BORE SIZE METRIC:
- 81.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- ORIGINAL
$76.57 -
WSM Piston Kit - Yamaha - +.5 mm 010-827-05K
WSM
$76.57Quality 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...09100660- SKU:
- 09100660
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- BORE SIZE METRIC:
- 81.00 MM
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
$76.57 -
WSM Piston Kit - Yamaha - +1 mm 010-827-07K
WSM
$76.57Quality 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...09100661- SKU:
- 09100661
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 81.00 MM
- MODEL:
- ORIGINAL
$76.57 -
WSM Top-End Rebuild Kit - Original Series - 1 mm 010-819-14
WSM
$315.04Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets09030122- SKU:
- 09030122
- Availability:
- Ships Same Business Day
- Weight:
- 4.15 LBS
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
- BORE SIZE METRIC:
- 88.91 MM
- MODEL:
- ORIGINAL SERIES
- RIDING STYLE:
- WATERCRAFT
- PISTON MATERIAL:
- ALUMINUM
- PISTON SIZE METRIC:
- +1.00 MM
- TYPE:
- TOP END
$315.04 -
WSM Top-End Rebuild Kit - Original Series - 1 mm 010-827-14
WSM
$229.87Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets09030125- SKU:
- 09030125
- Availability:
- Ships Same Business Day
- Weight:
- 3.25 LBS
- BORE SIZE METRIC:
- 82.00 MM
- PISTON SIZE METRIC:
- +1.00 MM
- TYPE:
- TOP END
- MODEL:
- ORIGINAL SERIES
- RIDING STYLE:
- WATERCRAFT
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- PRODUCT NAME:
- REBUILD KIT
$229.87 -
WSM Oil Filter - Sea-Doo 2-Stroke 006-546
WSM
$8.19For Sea-Doo 2-stroke models07120178- SKU:
- 07120178
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- COLOR/FINISH:
- WHITE
- PRODUCT NAME:
- OIL-INJECTION FILTER
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- CARTRIDGE
- STYLE:
- 2-STROKE
- STYLE:
- SEA-DOO
- UNITS:
- EACH
- BASE COLOR:
- WHITE
- MATERIAL:
- PLASTIC
$8.19 -
WSM Piston Assembly - Sea-Doo - +.5 mm 010-861-05PK
WSM
$136.64Quality 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...09101273- SKU:
- 09101273
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- BORE - OVERSIZE:
- +0,50 MM
- BORE SIZE METRIC:
- 99.96 MM
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- WATERCRAFT
- MODEL:
- PLATINUM
- PRODUCT NAME:
- PISTON KIT
$136.64 -
XCELDYNE Intake Valve XIVM13001
XCELDYNE
$198.35Titanium valve, Features an advanced "High-flow" design to increase flow by more than 15% over stock valves, Lightweight design increases RPM and horsepower, PVD-coated for outstanding wear-resistance in seat, tip and guide area09260469- SKU:
- 09260469
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- TITANIUM
- RIDING STYLE:
- OFF-ROAD
- SIZE METRIC:
- OVERSIZE (+1.00 MM)
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE
- UNITS:
- EACH
$198.35 -
XCELDYNE Exhaust Valve XEVM12001
XCELDYNE
$160.58Titanium valve, Features an advanced "High-flow" design to increase flow by more than 15% over stock valves, Lightweight design increases RPM and horsepower, PVD-coated for outstanding wear-resistance in seat, tip and guide area09260490- SKU:
- 09260490
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- TITANIUM
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- SIZE METRIC:
- STANDARD
- UNITS:
- EACH
$160.58 -
XCELDYNE Exhaust Valve XEVM13000
XCELDYNE
$202.40Titanium valve, Features an advanced "High-flow" design to increase flow by more than 15% over stock valves, Lightweight design increases RPM and horsepower, PVD-coated for outstanding wear-resistance in seat, tip and guide area09260491- SKU:
- 09260491
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- TITANIUM
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- SIZE METRIC:
- STANDARD
- UNITS:
- EACH
$202.40 -
XCELDYNE Exhaust Valve XEVM33006
XCELDYNE
$152.93Titanium valve, Features an advanced "High-flow" design to increase flow by more than 15% over stock valves, Lightweight design increases RPM and horsepower, PVD-coated for outstanding wear-resistance in seat, tip and guide area09260505- SKU:
- 09260505
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- PRODUCT NAME:
- VALVE
- SIZE METRIC:
- STANDARD
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- TITANIUM
$152.93 -
XCELDYNE Valve Locks - Exhaust XLOM45801
XCELDYNE
$38.18CNC-machined from 8620 steel, Industry first color coded, purpose-built intake-sized and exhaust-sized design, Design allows keepers to stay locked at higher rpm09260520- SKU:
- 09260520
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- PRODUCT NAME:
- LOCK
- APPLICATION:
- EXHAUST
- TYPE:
- VALVE
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- SET OF 4
$38.18 -
XCELDYNE Intake Valve Springs PSIMX1905
XCELDYNE
$75.57Single spring, low drag design increases horsepower, Springs can only be used on titanium valves, Designed for use with most cam grinds, Purpose built racing valve spring made from the highest quality Kobe spring wire09260637- SKU:
- 09260637
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- SPRING
- TYPE:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- PAIR
$75.57
