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 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,...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...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...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...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...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...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...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...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...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...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...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...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 -
PROX Intake Valve 28.2706-2
PROX
$25.95A properly functioning intake valve is critical to engine breathing efficiency and combustion reliability. The PROX 28.2706-2 is precision-engineered to OEM specifications, ensuring consistent...09260687- SKU:
- 09260687
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$25.95 -
PROX Valve and Spring Kit 28.SIS3406-2
PROX
$143.95If you're pushing your engine beyond stock parameters, OEM valves and springs will become a limiting factor—they'll wear faster and struggle to keep up with aggressive cam profiles and high RPM...09261433- SKU:
- 09261433
- Availability:
- Ships Same Business Day
- Weight:
- 0.29 LBS
- PRODUCT NAME:
- SPRING KIT
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- UNITS:
- KIT
$143.95 -
PROX Engine Rebuild Kit 10.EK5806.A
PROX
$1,110.95A complete engine rebuild requires precision components that restore your engine to OEM specifications or better. The PROX Engine Rebuild Kit 10.EK5806.A delivers comprehensive gasket sets, seals,...09031687- SKU:
- 09031687
- Availability:
- Ships Same Business Day
- Weight:
- 25.51 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- UTV
- BORE SIZE METRIC:
- STANDARD
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$1,110.95 -
PROX Engine Rebuild Kit 10.EK5806.B
PROX
$1,099.95A complete engine rebuild requires precision-engineered components that restore your engine to OEM specifications or better. The PROX Engine Rebuild Kit 10.EK5806.B delivers the critical internal...09031688- SKU:
- 09031688
- Availability:
- Ships Same Business Day
- Weight:
- 25.56 LBS
- RIDING STYLE:
- UTV
- BORE SIZE METRIC:
- +0.01 MM
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- ATV
$1,099.95 -
PROX Engine Rebuild Kit 10.EK5806.A1
PROX
$1,110.95A complete engine rebuild demands precision components that restore your engine to factory specifications—or better. The PROX Engine Rebuild Kit 10.EK5806.A1 delivers OEM-quality internal parts in...09031690- SKU:
- 09031690
- Availability:
- Ships Same Business Day
- Weight:
- 26.61 LBS
- BORE SIZE METRIC:
- STANDARD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- ATV
- TYPE:
- ENGINE
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
$1,110.95 -
PROX Engine Rebuild Kit 10.EK5805.A1
PROX
$1,099.95A complete engine rebuild requires precision components that restore your engine to OEM specifications while maintaining the durability your high-performance builds demand. The PROX Engine Rebuild...09031696- SKU:
- 09031696
- Availability:
- Ships Same Business Day
- Weight:
- 25.61 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- BORE SIZE METRIC:
- STANDARD
- RIDING STYLE:
- UTV
$1,099.95 -
PROX Engine Rebuild Kit 10.EK5806.C
PROX
$1,099.95A comprehensive engine rebuild kit is essential when you're restoring your engine to factory specifications or preparing it for high-performance duty. The PROX 10.EK5806.C delivers...09031689- SKU:
- 09031689
- Availability:
- Ships Same Business Day
- Weight:
- 25.56 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- UTV
- BORE SIZE METRIC:
- +0.02 MM
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$1,099.95 -
PROX Engine Rebuild Kit 10.EK5805.B1
PROX
$1,099.95An engine rebuild demands precision components that restore performance to factory specifications—or better. The PROX Engine Rebuild Kit 10.EK5805.B1 provides OEM-quality internal parts engineered to...09031697- SKU:
- 09031697
- Availability:
- Ships Same Business Day
- Weight:
- 24.41 LBS
- BORE SIZE METRIC:
- +0.01 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- UNITS:
- KIT
- RIDING STYLE:
- UTV
$1,099.95
