ATV/UTV Engine
ATV/UTV Engine Parts at JJ Motorsports
Maximize your ATV or UTV's engine life with top-quality components from JJ Motorsports. Our selection includes gasket kits, connecting rods, water pump rebuild kits, and timing plugs designed for reliable sealing, strength, and easy installation in demanding off-road conditions. Compatible with Polaris, Can-Am, Honda, and more, these parts ensure peak power, reduced wear, and efficient operation for trail riding or utility work.
Shop trusted brands like Moose Racing for rebuild kits and Winderosa for gaskets. Explore related categories such as ATV/UTV air and fuel for intake upgrades or ATV/UTV drivetrain for transmission enhancements.
Top ATV/UTV Engine Products
- MOOSE UTILITY Clutch Cover Gasket Seal 500-1265-PU – Durable seal for clutch cover protection.
- WINDEROSA Standard Bore Gasket Kit 810585 – Complete kit for engine sealing and rebuilds.
- WORKS CONNECTION Engine Timing Plug 24-590 – Precision plug for accurate timing adjustments.
- MOOSE RACING Connecting Rod MR5026 – High-strength rod for engine durability.
- MOOSE RACING Water Pump Rebuild Kit 821865 – Comprehensive kit for water pump maintenance.
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 Kit - Honda 350 - +.75 mm 50-226-06K
WSM
$113.93If you're running a Honda 350 and want measurable gains in power output and piston longevity, the WSM +.75 mm Piston Kit delivers the thermal management and structural integrity that separates reliable builds from ones that fail. The MOS2-coated skirts...09103481- SKU:
- 09103481
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE SIZE METRIC:
- 79.25 MM
- PISTON MATERIAL:
- ALUMINUM
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,75 MM
- BORE - OVERSIZE METRIC:
- +0.75 MM
$113.93 -
WSM Piston Kit - Honda 350 - +1 mm 50-226-07K
WSM
$113.93If you're running a high-revving Honda 350 and want measurable gains in power and reliability, upgrading to forged pistons is one of the most direct paths to both. The WSM Piston Kit delivers OEM-quality construction with engineered...09103482- SKU:
- 09103482
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 79.50 MM
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
$113.93Qty in Cart: 0Quantity:Price:$113.93Subtotal: -
WSM Piston Kit - Honda 400 - +.25 mm 50-228-04K
WSM
$128.36A piston kit is one of the most critical upgrades for extracting reliable power from your Honda 400 engine. The WSM +.25 mm oversized pistons deliver improved ring groove strength and reduced friction through advanced surface coatings—meaning better heat...09103484- SKU:
- 09103484
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- MODEL:
- ORIGINAL
- RIDING STYLE:
- ATV
- BORE - OVERSIZE:
- +0,25 MM
- BORE SIZE METRIC:
- 85.25 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +0.25 MM
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
$128.36Qty in Cart: 0Quantity:Price:$128.36Subtotal: -
WSM Piston Kit - Honda 400 - +.50 mm 50-228-05K
WSM
$128.36A piston kit is the heart of your engine's combustion chamber—factory pistons wear out, develop carbon buildup, and lose efficiency over time. This WSM piston kit delivers OEM-quality construction with performance-focused engineering, including a...09103485- SKU:
- 09103485
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- MODEL:
- ORIGINAL
- RIDING STYLE:
- ATV
- BORE SIZE METRIC:
- 85.50 MM
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE - OVERSIZE:
- +0,50 MM
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
$128.36Qty in Cart: 0Quantity:Price:$128.36Subtotal: -
WSM Top End Kit - Arctic Cat - Standard 54-254-10
WSM
$229.40A worn or damaged top end directly impacts your Arctic Cat's power output, fuel efficiency, and engine longevity. This WSM Top End Kit delivers OEM-equivalent quality components in a single package, eliminating the guesswork of sourcing individual parts...09031466- SKU:
- 09031466
- Availability:
- Ships Same Business Day
- Weight:
- 2.00 LBS
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- OVERBORE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
$229.40 -
WSM Top End Kit - .5mm - Suzuki/Kawasaki 400 54-254-12
WSM
$214.20A worn or damaged top end directly impacts engine compression, fuel efficiency, and overall reliability—making a quality piston kit essential for maintaining peak performance. The WSM Top End Kit gives you OEM-grade components in a complete package,...09031468- SKU:
- 09031468
- Availability:
- Ships Same Business Day
- Weight:
- 2.05 LBS
- PRODUCT NAME:
- PISTON KIT
- OVERBORE METRIC:
- +0.50 MM
- UNITS:
- KIT
- RIDING STYLE:
- ATV
$214.20 -
WSM Top End Kit - .75mm - Suzuki/Kawasaki 400 54-254-13
WSM
$214.20A worn or damaged top end directly kills engine performance and reliability. The WSM Top End Kit delivers a complete, OEM-quality rebuild solution that restores compression, sealing, and power output without compromise. Whether you're rebuilding after...09031469- SKU:
- 09031469
- Availability:
- Ships Same Business Day
- Weight:
- 2.00 LBS
- PRODUCT NAME:
- PISTON KIT
- OVERBORE METRIC:
- +0.75 MM
- UNITS:
- KIT
- RIDING STYLE:
- ATV
$214.20 -
WSM Top End Kit - 1mm - Suzuki/Kawasaki 400 54-254-14
WSM
$214.20A worn or damaged top end doesn't just kill performance—it compromises reliability when you need it most. The WSM Top End Kit gives you everything required for a complete piston and gasket refresh on your Suzuki or Kawasaki 400, restoring compression and...09031470- SKU:
- 09031470
- Availability:
- Ships Same Business Day
- Weight:
- 1.95 LBS
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- OVERBORE METRIC:
- +1.00 MM
- RIDING STYLE:
- ATV
$214.20Qty in Cart: 0Quantity:Price:$214.20Subtotal: -
WSM Top End Kit - Standard - Honda 200 54-222-10
WSM
$93.40A worn or damaged top end compromises power delivery and fuel efficiency, cutting short your engine's service life. The WSM Top End Kit delivers OEM-quality components in a single package, eliminating the guesswork of sourcing individual parts and...09031471- SKU:
- 09031471
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- PRODUCT NAME:
- PISTON KIT
- OVERBORE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$93.40Qty in Cart: 0Quantity:Price:$93.40Subtotal: -
WSM Top End Kit - .25mm - Honda 200 54-222-11
WSM
$93.40A worn or damaged top end directly impacts compression, power delivery, and engine reliability. The WSM Top End Kit gives you everything needed for a complete piston and gasket refresh, restoring your Honda 200 to factory performance specs or beyond...09031472- SKU:
- 09031472
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- PRODUCT NAME:
- PISTON KIT
- OVERBORE METRIC:
- +0.25 MM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$93.40Qty in Cart: 0Quantity:Price:$93.40Subtotal: -
WSM Top End Kit - .5mm - Honda 200 54-222-12
WSM
$93.40A worn or damaged top end directly compromises engine efficiency, compression, and reliability—especially under racing conditions where precision tolerances are critical. The WSM Top End Kit delivers a complete piston assembly with OEM-grade components,...09031473- SKU:
- 09031473
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- OVERBORE METRIC:
- +0.50 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$93.40 -
WSM Top End Kit - .25mm - Honda 420 54-231-21
WSM
$191.47A top-end rebuild is one of the most critical maintenance intervals for any 4-stroke engine, and cutting corners with inferior components will cost you performance and reliability when it matters most. The WSM Top End Kit delivers OEM-quality pistons and...09031480- SKU:
- 09031480
- Availability:
- Ships Same Business Day
- Weight:
- 2.10 LBS
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- OVERBORE METRIC:
- +0.25 MM
- RIDING STYLE:
- ATV
$191.47 -
WSM Top End Kit - .5mm - Honda 420 54-231-22
WSM
$182.35A worn or damaged top end directly compromises combustion efficiency, power output, and engine reliability—especially critical in high-performance 4-stroke applications where precision tolerances define the difference between a competitive edge and...09031481- SKU:
- 09031481
- Availability:
- Ships Same Business Day
- Weight:
- 2.15 LBS
- OVERBORE METRIC:
- +0.50 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$182.35Qty in Cart: 0Quantity:Price:$182.35Subtotal: -
MOOSE RACING Top End Gasket Kit - Polaris 810969
MOOSE RACING
$95.95A quality top-end rebuild starts with the right gasket set. The MOOSE RACING Top End Gasket Kit delivers OEM-equivalent sealing performance at a fraction of the cost, eliminating the guesswork and ensuring your engine performs reliably whether you're...09344832- SKU:
- 09344832
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- RIDING STYLE:
- ATV
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- UTV
$95.95 -
MOOSE UTILITY Clutch Cover Gasket Seal 100-4540-PU
MOOSE UTILITY
$19.95A reliable clutch cover gasket seal is essential for maintaining proper engine sealing and preventing oil leakage at the clutch cover interface. Without a quality seal, you risk compromised compression, contaminated clutch plates, and potential engine...09351191- SKU:
- 09351191
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- CLUTCH COVER
- RIDING STYLE:
- UTV
- PRODUCT NAME:
- SEAL
- UNITS:
- EACH
$19.95Qty in Cart: 0Quantity:Price:$19.95Subtotal: -
MOOSE UTILITY Oneway Clutch Bearing 11-931
MOOSE UTILITY
$82.95A worn or failing one-way clutch bearing compromises power delivery and increases wear on surrounding drivetrain components. The MOOSE UTILITY 11-931 restores the precise, flawless rotation your drivetrain demands—whether you're running a high-output...09240580- SKU:
- 09240580
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- STARTER
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$82.95 -
PROX Exhaust Valve 28.2487-1
PROX
$46.95Exhaust valve performance directly impacts combustion efficiency, cylinder sealing, and overall engine reliability—especially under high RPM conditions. The PROX 28.2487-1 is precision-engineered to OEM specifications, ensuring consistent valve seat...09260680- SKU:
- 09260680
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
$46.95 -
PROX Intake Valve 28.2487-2
PROX
$30.95A precision intake valve is critical to your engine's breathing efficiency and combustion reliability. The PROX 28.2487-2 is manufactured to exacting OEM specifications, ensuring consistent performance whether you're rebuilding a high-mileage engine or...09260681- SKU:
- 09260681
- Availability:
- Ships Same Business Day
- Weight:
- 0.17 LBS
- RIDING STYLE:
- ATV
- MATERIAL:
- STEEL
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE
- UNITS:
- EACH
$30.95 -
PROX Intake Valve 28.2661-2
PROX
$30.95A precision intake valve is critical to your engine's breathing efficiency and combustion reliability. The PROX 28.2661-2 meets OEM specifications with tight manufacturing tolerances, ensuring consistent valve sealing and extended component life. Whether...09260685- SKU:
- 09260685
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- VALVE
- APPLICATION:
- INTAKE
- UNITS:
- EACH
- MATERIAL:
- STEEL
- RIDING STYLE:
- ATV
$30.95 -
PROX Exhaust Valve 28.2706-1
PROX
$40.95Exhaust valve performance directly impacts engine efficiency, combustion timing, and overall power delivery. The PROX 28.2706-1 is precision-engineered to OEM specifications, ensuring reliable sealing and consistent operation under demanding conditions...09260686- SKU:
- 09260686
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- MATERIAL:
- STEEL
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$40.95
