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
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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 performance and longevity in demanding applications. Whether...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 operation. The PROX 28.SIS3406-2 kit upgrades both your...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, and internal hardware designed to eliminate leaks, ensure...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 components you need to ensure proper ring sealing, bearing...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 one package, eliminating the guesswork of sourcing...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 Kit 10.EK5805.A1 delivers factory-quality internal...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 precision-engineered components that work together to ensure proper...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 handle the demands of both street and track...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 -
PROX Engine Rebuild Kit 10.EK5805.C1
PROX
$1,099.95A complete engine rebuild demands precision components that restore your engine to factory specifications or beyond. The PROX Engine Rebuild Kit 10.EK5805.C1 delivers OEM-quality pistons, rings, gaskets, and bearings in one comprehensive package,...09031698- SKU:
- 09031698
- Availability:
- Ships Same Business Day
- Weight:
- 25.86 LBS
- PRODUCT NAME:
- REBUILD KIT
- BORE SIZE METRIC:
- +0.02 MM
- UNITS:
- KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- UTV
$1,099.95 -
PROX Water Pump Rebuild Kit - Honda 57.1316
PROX
$62.95A failing water pump compromises cooling efficiency and risks catastrophic engine damage—especially under racing conditions or sustained high-performance driving. The PROX Water Pump Rebuild Kit gives you OEM-quality replacement internals at a fraction...09346988- SKU:
- 09346988
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- RIDING STYLE:
- ATV
- PRODUCT NAME:
- REPAIR KIT
$62.95 -
PROX Water Pump Rebuild Kit - Honda 57.1424
PROX
$67.95A failing water pump is a silent threat to engine longevity—seal degradation and bearing wear go unnoticed until catastrophic failure strikes. The PROX Water Pump Rebuild Kit gives you a cost-effective alternative to full replacement, restoring proper...09346994- SKU:
- 09346994
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$67.95 -
PROX Water Pump Rebuild Kit - Honda 57.1426
PROX
$62.95A failing water pump can silently compromise your engine's thermal management, leading to overheating and catastrophic damage during high-performance driving or extended track sessions. The PROX Water Pump Rebuild Kit gives you a cost-effective...09346996- SKU:
- 09346996
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$62.95 -
PROX Water Pump Rebuild Kit - Honda 57.1427
PROX
$41.95A failing water pump compromises engine cooling efficiency and risks catastrophic overheating—especially critical in high-performance applications where sustained heat loads are severe. The PROX Water Pump Rebuild Kit restores OEM cooling capacity with...09346997- SKU:
- 09346997
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$41.95 -
PROX Water Pump Rebuild Kit - Honda 57.1525
PROX
$37.84A failing water pump is a silent killer that can leave you stranded mid-race or roadside. The PROX Water Pump Rebuild Kit gives you a cost-effective way to restore your Honda's cooling system to factory specifications without replacing the entire...09347001- SKU:
- 09347001
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- WATER PUMP
- PRODUCT NAME:
- REPAIR KIT
$37.84 -
PROX Water Pump Rebuild Kit - Honda 57.1623
PROX
$154.95A failing water pump compromises your Honda's thermal management, risking catastrophic engine damage and costly downtime. The PROX 57.1623 rebuild kit restores your pump to OEM specifications with precision-engineered components, eliminating the need for...09347002- SKU:
- 09347002
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
$154.95 -
PROX Water Pump Rebuild Kit - Yamaha 57.2317
PROX
$52.95A failing water pump can silently damage your engine by allowing coolant temperatures to spike, compromising both reliability and performance. The PROX Water Pump Rebuild Kit gives you OEM-equivalent replacement components at a fraction of the cost of a...09347008- SKU:
- 09347008
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- REPAIR KIT
- UNITS:
- KIT
- TYPE:
- WATER PUMP
- RIDING STYLE:
- ATV
$52.95Qty in Cart: 0Quantity:Price:$52.95Subtotal: -
PROX Water Pump Rebuild Kit - Yamaha 57.2427
PROX
$54.95A failing water pump compromises your engine's thermal management and can lead to catastrophic overheating during sustained track use or aggressive riding. The PROX Water Pump Rebuild Kit restores OEM-level cooling performance with precision-engineered...09347018- SKU:
- 09347018
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- RIDING STYLE:
- UTV
$54.95Qty in Cart: 0Quantity:Price:$54.95Subtotal: -
PROX Water Pump Rebuild Kit - Yamaha 57.2429
PROX
$57.95A failing water pump compromises engine cooling efficiency and risks catastrophic overheating, especially under high-performance racing conditions. The PROX Water Pump Rebuild Kit restores OEM-level cooling performance with precision-engineered internal...09347019- SKU:
- 09347019
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$57.95 -
PROX Water Pump Rebuild Kit - Yamaha 57.2621
PROX
$62.95Your Yamaha's water pump is critical to engine longevity—neglecting it means risking catastrophic overheating and head gasket failure. The PROX 57.2621 Rebuild Kit restores your pump to OEM performance specifications without the expense of full...09347020- SKU:
- 09347020
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- RIDING STYLE:
- ATV
$62.95 -
PROX Water Pump Rebuild Kit - Yamaha 57.2726
PROX
$62.95A degraded water pump compromises engine cooling efficiency and risks catastrophic overheating, especially under sustained racing conditions or high-RPM operation. The PROX Water Pump Rebuild Kit restores OEM cooling performance with precision-engineered...09347022- SKU:
- 09347022
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- REPAIR KIT
- UNITS:
- KIT
- TYPE:
- WATER PUMP
- RIDING STYLE:
- ATV
$62.95
