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 Piston Kit 01.2020.000
PROX
$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...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
$121.95 -
PROX Ring Set 02.2020.000
PROX
$49.95Piston 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...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
$49.95 -
PROX Piston Kit 01.2020.025
PROX
$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...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
$99.95Qty in Cart: 0Quantity:Price:$99.95Subtotal: -
PROX Ring Set 02.2020.025
PROX
$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...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
$49.95Qty in Cart: 0Quantity:Price:$49.95Subtotal: -
PROX Ring Set 02.2020.050
PROX
$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...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
$49.95Qty in Cart: 0Quantity:Price:$49.95Subtotal: -
PROX Piston Kit 01.2020.075
PROX
$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...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
$121.95 -
PROX Piston Kit 01.2020.100
PROX
$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...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
$121.95Qty in Cart: 0Quantity:Price:$121.95Subtotal: -
PROX Piston Kit 01.2020.125
PROX
$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...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
$99.95Qty in Cart: 0Quantity:Price:$99.95Subtotal: -
PROX Piston Kit 01.2020.150
PROX
$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,...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
$121.95 -
PROX Ring Set 02.2020.150
PROX
$49.95Piston 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...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
$49.95 -
PROX Piston Kit 01.2660.000
PROX
$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...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
$155.95 -
PROX Piston Kit 01.2660.050
PROX
$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...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
$155.95 -
PROX Piston Kit 01.2660.100
PROX
$139.95When your engine demands reliability at high RPM, OEM-spec pistons are non-negotiable. The PROX Piston Kit 01.2660.100 delivers factory-engineered performance with the precision tolerances required...PX4674- SKU:
- PX4674
- Availability:
- Ships Same Business Day
- Weight:
- 1.38 LBS
- BORE SIZE METRIC:
- 101.00 MM
- RIDING STYLE:
- UTV
- PISTON MATERIAL:
- ALUMINUM ALLOY
- ENGINE TYPE:
- 4-STROKE
- PISTON SIZE METRIC:
- +1.00 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PISTON DIAMETER METRIC:
- 101.00 MM
$139.95Qty in Cart: 0Quantity:Price:$139.95Subtotal: -
PROX Piston Kit 01.1495.000
PROX
$155.95When your engine demands precision and reliability, OEM-equivalent performance is non-negotiable. The PROX Piston Kit 01.1495.000 delivers factory-spec durability with CNC-machined accuracy, ensuring...PX2500- SKU:
- PX2500
- Availability:
- Ships Same Business Day
- Weight:
- 0.98 LBS
- BORE SIZE METRIC:
- 85.00 MM
- PISTON SIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 85.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON KIT
$155.95 -
PROX Piston Kit 01.1495.025
PROX
$155.95Whether you're rebuilding after high-mileage wear or restoring a race engine to factory specifications, the PROX Piston Kit 01.1495.025 delivers the precision and durability that serious engine...PX2501- SKU:
- PX2501
- Availability:
- Ships Same Business Day
- Weight:
- 0.98 LBS
- BORE SIZE METRIC:
- 85.25 MM
- PISTON DIAMETER METRIC:
- 85.25 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- PISTON SIZE IMPERIAL:
- +0.010'
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$155.95 -
PROX Piston Kit 01.2020.050
PROX
$121.95OEM-equivalent piston performance demands precision engineering and materials that can withstand extreme combustion pressures without compromise. The PROX Piston Kit 01.2020.050 delivers exactly...PX4192- SKU:
- PX4192
- Availability:
- Ships Same Business Day
- Weight:
- 0.63 LBS
- PISTON SIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- STREET
- BORE SIZE METRIC:
- 64.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PISTON DIAMETER METRIC:
- 64.50 MM
$121.95 -
PROX Exhaust Valve 28.2661-1
PROX
$40.95Precision exhaust valve performance directly impacts combustion efficiency, cylinder sealing, and overall engine reliability. The PROX 28.2661-1 is engineered to OEM specifications, ensuring...09260684- SKU:
- 09260684
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
$40.95 -
PROX Top End Gasket Kit - Warrior/Raptor/Grizzly 35.2160
PROX
$46.95A properly sealed top end is non-negotiable for engine reliability and performance. Over time, factory gaskets degrade from heat cycling and compression, leading to oil leaks, vacuum leaks, and...09347124- SKU:
- 09347124
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- TYPE:
- TOP END
$46.95 -
Rekluse Clutch Cover KTM 450 SX-F 2007-2012 RMS-330
REKLUSE
$189.00Stock clutch covers crack under sustained trail abuse—and when they do, you're looking at oil loss and potential engine damage. The Rekluse RMS-330 replaces that weak point with billet aluminum that...09401793- SKU:
- 09401793
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BILLET ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
$189.00Qty in Cart: 0Quantity:Price:$189.00Subtotal: -
Hiflofiltro Oil Filter for Honda CBF125 2009-2015 HF113
HIFLOFILTRO
$3.92A quality oil filter is essential to engine longevity, and the HIFLOFILTRO HF113 delivers the filtration efficiency your Honda CBF125 needs to maintain peak performance across all riding conditions...HF113- SKU:
- HF113
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BASE COLOR:
- RED
- COLOR/FINISH:
- SILVER
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- UTV
- WIDTH METRIC:
- 50 MM
- COLOR/FINISH:
- RED
- LENGTH METRIC:
- 38 MM
- RIDING STYLE:
- ATV
- TYPE:
- CARTRIDGE
- UNITS:
- EACH
- STYLE:
- PREMIUM
$3.92
