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
-
PROX Connecting Rod 03.2310F
PROX
$132.95A connecting rod is the critical link between your piston and crankshaft—its strength and precision directly impact engine reliability and power delivery. The PROX Connecting Rod 03.2310F is engineered for applications demanding consistent performance...09230146- SKU:
- 09230146
- Availability:
- Ships Same Business Day
- Weight:
- 0.78 LBS
- ENGINE TYPE:
- 2-STROKE
- MATERIAL:
- FORGED STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$132.95 -
PROX Connecting Rod 03.2434
PROX
$175.95A connecting rod is the critical link between your crankshaft and piston, transmitting combustion forces while managing rotational stress at extreme RPMs. The PROX 03.2434 delivers reliable performance with a complete assembly that eliminates sourcing...09230177- SKU:
- 09230177
- Availability:
- Ships Same Business Day
- Weight:
- 1.51 LBS
- MATERIAL:
- FORGED STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- ATV
- ENGINE TYPE:
- 4-STROKE
- UNITS:
- EACH
$175.95Qty in Cart: 0Quantity:Price:$175.95Subtotal: -
On Sale
PROX Ring Set 02.1495.000
PROX
MSRP: $49.95Now: $42.00Was: $49.95Piston ring failure compromises compression, oil control, and engine efficiency—leading to power loss, increased blowby, and accelerated wear. The PROX Ring Set 02.1495.000 delivers OEM-specification performance with precision engineering, ensuring your...PX2500R- SKU:
- PX2500R
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- UNITS:
- SET
MSRP: $49.95Now: $42.00Was: $49.95Qty in Cart: 0Quantity:Price:MSRP: $49.95Now: $42.00Was: $49.95Subtotal: -
On Sale
PROX Ring Set 02.1495.025
PROX
MSRP: $47.34Now: $42.00Was: $47.34Piston ring sets are critical to engine performance—they seal combustion pressure, regulate oil consumption, and directly impact compression, power delivery, and engine longevity. The PROX Ring Set 02.1495.025 delivers OEM-quality reliability with...PX2501R- SKU:
- PX2501R
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- UNITS:
- SET
- PRODUCT NAME:
- PISTON RING
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
MSRP: $47.34Now: $42.00Was: $47.34Qty in Cart: 0Quantity:Price:MSRP: $47.34Now: $42.00Was: $47.34Subtotal: -
On Sale
PROX Piston Kit 01.1495.050
PROX
MSRP: $155.95Now: $119.00Was: $155.95When your engine demands reliability at high RPM, OEM-quality pistons are non-negotiable. The PROX Piston Kit 01.1495.050 delivers factory-spec performance without compromise, engineered to handle sustained boost and aggressive tuning while maintaining...PX2502- SKU:
- PX2502
- Availability:
- Ships Same Business Day
- Weight:
- 0.98 LBS
- PISTON DIAMETER METRIC:
- 85.50 MM
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- BORE SIZE METRIC:
- 85.50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON SIZE IMPERIAL:
- +0.020'
- UNITS:
- EACH
MSRP: $155.95Now: $119.00Was: $155.95 -
On Sale
PROX Piston Kit 01.1495.100
PROX
MSRP: $139.95Now: $119.00Was: $139.95Worn or damaged pistons compromise combustion efficiency, reduce power output, and risk catastrophic engine failure. The PROX Piston Kit 01.1495.100 restores your engine to OEM performance specifications with precision-engineered components manufactured...PX2504- SKU:
- PX2504
- Availability:
- Ships Same Business Day
- Weight:
- 0.98 LBS
- PISTON DIAMETER METRIC:
- 86.00 MM
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON SIZE IMPERIAL:
- +0.040'
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- BORE SIZE METRIC:
- 86.00 MM
MSRP: $139.95Now: $119.00Was: $139.95Qty in Cart: 0Quantity:Price:MSRP: $139.95Now: $119.00Was: $139.95Subtotal: -
On Sale
PROX Piston Kit 01.2281.000
PROX
MSRP: $121.95Now: $90.00Was: $121.95When your engine's pistons wear beyond serviceable limits, you need a replacement that matches OEM performance without compromise. The PROX Piston Kit 01.2281.000 delivers precision-engineered internals manufactured to the same exacting standards as...PX4170- SKU:
- PX4170
- Availability:
- Ships Same Business Day
- Weight:
- 0.63 LBS
- BORE SIZE METRIC:
- 66.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON SIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PISTON DIAMETER METRIC:
- 66.35 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
MSRP: $121.95Now: $90.00Was: $121.95 -
On Sale
PROX Piston Kit 01.2281.150
PROX
MSRP: $105.95Now: $90.00Was: $105.95A piston kit is the heart of engine reliability and performance—worn or damaged pistons compromise combustion efficiency, increase blowby, and accelerate wear throughout your engine. The PROX Piston Kit 01.2281.150 delivers OEM-quality replacement...PX4176- SKU:
- PX4176
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 67.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 67.50 MM
- PISTON SIZE METRIC:
- +1.50 MM
MSRP: $105.95Now: $90.00Was: $105.95Qty in Cart: 0Quantity:Price:MSRP: $105.95Now: $90.00Was: $105.95Subtotal: -
On Sale
PROX Piston Kit 01.2020.000
PROX
MSRP: $121.95Now: $85.00Was: $121.95A worn or damaged piston kit compromises engine compression, throttle response, and overall reliability—costing you performance on the track or road. The PROX Piston Kit 01.2020.000 restores your engine to OEM specifications with precision-engineered...PX4190- SKU:
- PX4190
- Availability:
- Ships Same Business Day
- Weight:
- 0.63 LBS
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 64.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PISTON DIAMETER METRIC:
- 64.00 MM
- PISTON SIZE METRIC:
- STANDARD
- RIDING STYLE:
- STREET
MSRP: $121.95Now: $85.00Was: $121.95 -
On Sale
PROX Ring Set 02.2020.000
PROX
MSRP: $49.47Now: $32.00Was: $49.47Piston ring failure is one of the fastest ways to lose compression and power in your engine—and once sealing deteriorates, you're looking at blow-by, oil consumption, and catastrophic damage. The PROX Ring Set 02.2020.000 restores OEM-specification...PX4190R- SKU:
- PX4190R
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- RIDING STYLE:
- STREET
- UNITS:
- SET
- PRODUCT NAME:
- PISTON RING
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
MSRP: $49.47Now: $32.00Was: $49.47 -
On Sale
PROX Piston Kit 01.2020.025
PROX
MSRP: $99.95Now: $85.00Was: $99.95A piston kit is the foundation of reliable engine performance—worn or damaged pistons compromise compression, efficiency, and durability. The PROX Piston Kit 01.2020.025 delivers OEM-equivalent quality with precision engineering, making it an ideal...PX4191- SKU:
- PX4191
- Availability:
- Ships Same Business Day
- Weight:
- 0.63 LBS
- BORE SIZE METRIC:
- 64.25 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- PISTON SIZE METRIC:
- +0.25 MM
- RIDING STYLE:
- STREET
- PISTON DIAMETER METRIC:
- 64.25 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
MSRP: $99.95Now: $85.00Was: $99.95Qty in Cart: 0Quantity:Price:MSRP: $99.95Now: $85.00Was: $99.95Subtotal: -
On Sale
PROX Ring Set 02.2020.025
PROX
MSRP: $49.95Now: $42.00Was: $49.95Piston ring wear is one of the most common culprits behind lost compression, increased blow-by, and accelerated engine degradation. The PROX Ring Set 02.2020.025 restores OEM-spec ring sealing and combustion efficiency, whether you're rebuilding after a...PX4191R- SKU:
- PX4191R
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
- RIDING STYLE:
- STREET
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
MSRP: $49.95Now: $42.00Was: $49.95Qty in Cart: 0Quantity:Price:MSRP: $49.95Now: $42.00Was: $49.95Subtotal: -
On Sale
PROX Ring Set 02.2020.050
PROX
MSRP: $49.95Now: $42.00Was: $49.95Piston rings are the critical seal between your combustion chamber and crankcase—when they wear, you lose compression, burn oil, and sacrifice power across the entire RPM range. The PROX Ring Set 02.2020.050 restores OEM-spec performance with...PX4192R- SKU:
- PX4192R
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
MSRP: $49.95Now: $42.00Was: $49.95Qty in Cart: 0Quantity:Price:MSRP: $49.95Now: $42.00Was: $49.95Subtotal: -
On Sale
PROX Piston Kit 01.2020.075
PROX
MSRP: $121.95Now: $85.00Was: $121.95Worn or damaged pistons compromise combustion efficiency, increase blow-by, and accelerate engine wear—ultimately costing you power and reliability. The PROX Piston Kit 01.2020.075 restores your engine to OEM performance specifications using...PX4193- SKU:
- PX4193
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 64.75 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- PISTON SIZE METRIC:
- +0.75 MM
- BORE SIZE METRIC:
- 64.75 MM
MSRP: $121.95Now: $85.00Was: $121.95 -
On Sale
PROX Piston Kit 01.2020.100
PROX
MSRP: $121.95Now: $85.00Was: $121.95Factory piston wear is one of the most common reasons for lost compression, power, and reliability in high-mileage engines. The PROX Piston Kit 01.2020.100 restores your engine to OEM specifications with precision-manufactured components engineered for...PX4194- SKU:
- PX4194
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
- BORE SIZE METRIC:
- 65.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 65.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON SIZE METRIC:
- +1.00 MM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- PRODUCT NAME:
- PISTON KIT
MSRP: $121.95Now: $85.00Was: $121.95 -
On Sale
PROX Piston Kit 01.2020.125
PROX
MSRP: $99.95Now: $85.00Was: $99.95When your engine demands precise combustion and reliable performance cycle after cycle, OEM-spec pistons are non-negotiable. The PROX Piston Kit 01.2020.125 delivers factory-engineered reliability with Japanese manufacturing precision, ensuring...PX4195- SKU:
- PX4195
- Availability:
- Ships Same Business Day
- Weight:
- 0.63 LBS
- PISTON SIZE METRIC:
- +1.25 MM
- PISTON DIAMETER METRIC:
- 65.25 MM
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- BORE SIZE METRIC:
- 65.25 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- ATV
MSRP: $99.95Now: $85.00Was: $99.95Qty in Cart: 0Quantity:Price:MSRP: $99.95Now: $85.00Was: $99.95Subtotal: -
On Sale
PROX Piston Kit 01.2020.150
PROX
MSRP: $121.95Now: $85.00Was: $121.95When your engine demands reliability and precision, OEM-quality pistons are non-negotiable. The PROX Piston Kit 01.2020.150 delivers exact fitment and performance specifications without compromise, engineered in Japan to meet or exceed factory standards...PX4196- SKU:
- PX4196
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- RIDING STYLE:
- STREET
- PISTON DIAMETER METRIC:
- 65.50 MM
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 65.50 MM
- PISTON SIZE METRIC:
- +1.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- UNITS:
- EACH
MSRP: $121.95Now: $85.00Was: $121.95 -
On Sale
PROX Ring Set 02.2020.150
PROX
MSRP: $49.47Now: $42.00Was: $49.47Piston rings are critical to engine sealing and compression integrity—worn or damaged rings will result in blow-by, oil consumption, and power loss. The PROX Ring Set 02.2020.150 delivers OEM-equivalent performance with Japanese manufacturing precision,...PX4196R- SKU:
- PX4196R
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- STREET
- UNITS:
- SET
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
MSRP: $49.47Now: $42.00Was: $49.47 -
On Sale
PROX Piston Kit 01.2660.000
PROX
MSRP: $155.95Now: $119.00Was: $155.95When your engine's pistons show wear, you're losing compression, efficiency, and power—and risking catastrophic failure. The PROX Piston Kit 01.2660.000 is engineered to OEM specifications using high-silicon-content aluminum alloy, delivering the...PX4670- SKU:
- PX4670
- Availability:
- Ships Same Business Day
- Weight:
- 1.34 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PISTON DIAMETER METRIC:
- 100.00 MM
- BORE SIZE METRIC:
- 100.00 MM
- PISTON SIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- UTV
MSRP: $155.95Now: $119.00Was: $155.95 -
On Sale
PROX Piston Kit 01.2660.050
PROX
MSRP: $155.95Now: $119.00Was: $155.95When your engine demands precision and reliability, OEM-quality pistons are non-negotiable. The PROX Piston Kit 01.2660.050 delivers Japanese manufacturing excellence with high-silicon aluminum construction that meets or exceeds factory specifications,...PX4672- SKU:
- PX4672
- Availability:
- Ships Same Business Day
- Weight:
- 1.36 LBS
- BORE SIZE METRIC:
- 100.50 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 100.50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON SIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- UTV
MSRP: $155.95Now: $119.00Was: $155.95Qty in Cart: 0Quantity:Price:MSRP: $155.95Now: $119.00Was: $155.95Subtotal:
