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 - Polaris - +.50 mm 50-305-05PK
WSM
$95.36If you're pushing your Polaris engine to its limits, stock pistons won't cut it. The WSM Piston Kit delivers OEM-quality construction with performance-focused engineering—MOS2-coated skirts that...5030505- SKU:
- 5030505
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 83.50 MM
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- MODEL:
- ORIGINAL
- RIDING STYLE:
- ATV
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- ALUMINUM
$95.36Qty in Cart: 0Quantity:Price:$95.36Subtotal: -
WSM Piston Kit - Polaris - +1 mm 50-305-07PK
WSM
$95.36When you're pushing your Polaris to the limit, factory pistons can't keep pace with the demands of high-RPM performance. The WSM Piston Kit delivers OEM-grade quality with engineered...5030507- SKU:
- 5030507
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 84.00 MM
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$95.36Qty in Cart: 0Quantity:Price:$95.36Subtotal: -
WSM Piston Kit - Yamaha - Standard 50-530PK
WSM
$90.05OEM-equivalent pistons are the foundation of reliable engine performance, and WSM's piston kit delivers the durability and precision your Yamaha engine demands. The MOS2 coating on the skirts...50530- SKU:
- 50530
- Availability:
- Ships Same Business Day
- Weight:
- 1.13 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 66.00 MM
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
$90.05 -
WSM Piston Kit - Yamaha - +.50 mm 50-530-05PK
WSM
$90.05High-performance pistons are critical to engine reliability and power output, especially in forced induction or high-RPM applications where OEM components reach their limits. The WSM Piston Kit...5053005- SKU:
- 5053005
- Availability:
- Ships Same Business Day
- Weight:
- 1.13 LBS
- BORE SIZE METRIC:
- 66.50 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
$90.05 -
WSM Piston Kit - Yamaha - +1 mm 50-530-07PK
WSM
$90.05Stock pistons wear down and lose compression, robbing your engine of power and efficiency. WSM's +1mm piston kit restores performance beyond factory specs with precision engineering and advanced...5053007- SKU:
- 5053007
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE - OVERSIZE:
- +1,00 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 67.00 MM
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
$90.05 -
WSM Piston Kit - Yamaha - Standard 50-520PK
WSM
$93.81Stock pistons wear out, lose compression, and rob your engine of power—especially under sustained racing conditions. The WSM Piston Kit delivers OEM-equivalent quality with engineered upgrades that...50520- SKU:
- 50520
- Availability:
- Ships Same Business Day
- Weight:
- 1.13 LBS
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 64.00 MM
- MODEL:
- ORIGINAL
- RIDING STYLE:
- ATV
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
$93.81 -
WSM Piston Kit - Yamaha - +.50 mm 50-520-05PK
WSM
$93.81High-revving engines demand pistons engineered for extreme conditions—stock units simply won't sustain the thermal and mechanical stress of sustained performance. The WSM Piston Kit delivers...5052005- SKU:
- 5052005
- Availability:
- Ships Same Business Day
- Weight:
- 1.13 LBS
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- BORE SIZE METRIC:
- 64.50 MM
- MODEL:
- ORIGINAL
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
$93.81Qty in Cart: 0Quantity:Price:$93.81Subtotal: -
WSM Piston Kit - Yamaha - +1 mm 50-520-07PK
WSM
$93.81A piston kit is the heart of your engine's combustion cycle—when yours show wear, you lose compression, power, and efficiency. WSM's +1mm oversized pistons are engineered to restore your engine to...5052007- SKU:
- 5052007
- Availability:
- Ships Same Business Day
- Weight:
- 1.13 LBS
- BORE SIZE METRIC:
- 65.00 MM
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- BORE - OVERSIZE:
- +1,00 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +1.00 MM
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
$93.81 -
WSM High Performance Sleeve 60-520
WSM
$125.11The WSM High Performance Sleeve 60-520 delivers measurable horsepower gains through optimized port geometry, without requiring costly case modifications or machine work. This bolt-on upgrade is ideal...60520- SKU:
- 60520
- Availability:
- Ships Same Business Day
- Weight:
- 1.98 LBS
- PRODUCT NAME:
- SLEEVE
- TYPE:
- CYLINDER
- UNITS:
- EACH
- STYLE:
- HEAVY DUTY
- RIDING STYLE:
- ATV
$125.11Qty in Cart: 0Quantity:Price:$125.11Subtotal: -
WSM High Performance Sleeve 60-520-01
WSM
$107.64The WSM High Performance Sleeve 60-520-01 delivers measurable horsepower gains through optimized port geometry—without requiring case modifications or machine work. If you're looking for a...6052001- SKU:
- 6052001
- Availability:
- Ships Same Business Day
- Weight:
- 1.98 LBS
- STYLE:
- STOCK
- TYPE:
- CYLINDER
- UNITS:
- EACH
- PRODUCT NAME:
- SLEEVE
- RIDING STYLE:
- ATV
$107.64 -
WSM High Performance Sleeve 60-520-02
WSM
$138.01The WSM High Performance Sleeve 60-520-02 delivers measurable horsepower gains through optimized port geometry—without requiring extensive case modifications or machine work. If you're seeking...6052002- SKU:
- 6052002
- Availability:
- Ships Same Business Day
- Weight:
- 1.98 LBS
- UNITS:
- EACH
- STYLE:
- BIG BORE
- TYPE:
- CYLINDER
- PRODUCT NAME:
- SLEEVE
- RIDING STYLE:
- ATV
$138.01Qty in Cart: 0Quantity:Price:$138.01Subtotal: -
WSM Ring Set 51-220
WSM
$35.41Piston ring quality directly impacts compression, blow-by control, and engine longevity—making the WSM Ring Set 51-220 essential for any rebuild or performance upgrade. These rings are engineered to...09120472- SKU:
- 09120472
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE - OVERSIZE:
- STANDARD
- RIDING STYLE:
- ATV
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
$35.41Qty in Cart: 0Quantity:Price:$35.41Subtotal: -
WSM Ring Set 51-230-04
WSM
$37.18Proper ring sealing is fundamental to engine performance and longevity. The WSM Ring Set 51-230-04 delivers the compression integrity and blow-by control your engine needs, whether you're building a...09120498- SKU:
- 09120498
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- ATV
- BORE - OVERSIZE:
- +0,25 MM
- BORE - OVERSIZE METRIC:
- +0.25 MM
- UNITS:
- SET
$37.18 -
WSM Ring Set 51-250
WSM
$37.18Piston ring sets are the critical seal between your combustion chamber and crankcase—without proper ring sealing, you lose compression, sacrifice power output, and accelerate engine wear. The WSM...09120502- SKU:
- 09120502
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- UNITS:
- SET
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- ATV
$37.18Qty in Cart: 0Quantity:Price:$37.18Subtotal: -
WSM Ring Set 51-250-04
WSM
$37.18Ring sets are fundamental to engine performance and longevity—they seal combustion pressure, regulate oil consumption, and directly impact compression and power output. The WSM Ring Set 51-250-04...09120503- SKU:
- 09120503
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE - OVERSIZE METRIC:
- +0.25 MM
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE:
- +0,25 MM
- UNITS:
- SET
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- ATV
$37.18 -
WSM Ring Set 51-250-05
WSM
$34.72Proper ring sealing is fundamental to engine efficiency and longevity. The WSM Ring Set 51-250-05 delivers consistent compression and blow-by control across the entire RPM range, directly impacting...09120504- SKU:
- 09120504
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- ATV
- BORE - OVERSIZE METRIC:
- +0.50 MM
- UNITS:
- SET
$34.72Qty in Cart: 0Quantity:Price:$34.72Subtotal: -
WSM Ring Set 51-250-07
WSM
$34.72Proper ring sealing is fundamental to engine performance, fuel efficiency, and longevity. The WSM Ring Set 51-250-07 delivers OEM-quality compression and oil control, preventing blow-by and...09120506- SKU:
- 09120506
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- ATV
- BORE - OVERSIZE:
- +1,00 MM
- UNITS:
- SET
$34.72Qty in Cart: 0Quantity:Price:$34.72Subtotal: -
WSM Ring Set 51-255
WSM
$37.18Proper ring sealing is fundamental to engine performance and longevity—undersized or worn piston rings lead to blow-by, lost compression, and increased oil consumption. The WSM Ring Set 51-255...09120512- SKU:
- 09120512
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- ATV
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- SET
$37.18Qty in Cart: 0Quantity:Price:$37.18Subtotal: -
WSM Ring Set 51-540
WSM
$37.18Piston ring sets are critical to engine sealing and compression—poor ring quality leads to blowby, lost power, and accelerated wear. The WSM Ring Set 51-540 delivers OEM-equivalent or superior...09120517- SKU:
- 09120517
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- ATV
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- UNITS:
- SET
$37.18Qty in Cart: 0Quantity:Price:$37.18Subtotal: -
WSM Ring Set 51-311-05
WSM
$37.18Piston rings are critical to engine performance—they seal combustion pressure, regulate oil consumption, and directly impact horsepower delivery and engine longevity. The WSM Ring Set 51-311-05...09120555- SKU:
- 09120555
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- ATV
- BORE - OVERSIZE:
- +0,50 MM
- UNITS:
- SET
$37.18
