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!
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- Qty in Cart
- Quantity
- Price
- Subtotal
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MOOSE RACING Transaxle Seal Kit - Polaris 25-2142-5
MOOSE RACING
$55.95Transaxle oil leaks compromise performance and can lead to catastrophic drivetrain failure if left unaddressed. This complete seal kit from MOOSE Racing eliminates guesswork by including every seal you need for a thorough repair, restoring your Polaris...09351293- SKU:
- 09351293
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
$55.95 -
MOOSE RACING Differential Seal Kit - Yamaha - Front 25-2145-5
MOOSE RACING
$55.95Differential seal failure leads to fluid leakage, contamination, and catastrophic drivetrain damage—often at the worst possible moment. The MOOSE RACING Differential Seal Kit restores a complete seal with OEM-quality components engineered for reliability...09351294- SKU:
- 09351294
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$55.95 -
MOOSE RACING Differential Seal Kit - Can-Am - Front 25-2149-5
MOOSE RACING
$16.95Differential seal failure is one of the most overlooked maintenance issues that can lead to catastrophic drivetrain damage. The MOOSE RACING Differential Seal Kit for Can-Am front differentials provides a complete, factory-quality refresh that restores...09351295- SKU:
- 09351295
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$16.95 -
MOOSE RACING Differential Seal Kit - Can-Am - Rear 25-2150-5
MOOSE RACING
$33.95Differential seals degrade from heat cycling and gear oil exposure, leading to leaks that compromise lubrication and invite contamination into your drivetrain. The MOOSE RACING Differential Seal Kit delivers OEM-quality sealing with high-speed-rated...09351296- SKU:
- 09351296
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
$33.95 -
MOOSE RACING Differential Seal Kit - Can-Am - Rear 25-2151-5
MOOSE RACING
$50.95Differential seals are critical wear items that prevent gear oil from escaping and contamination from entering your rear differential. Over time, heat cycling and continuous operation cause factory seals to degrade, leading to leaks and costly damage...09351297- SKU:
- 09351297
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
$50.95 -
MOOSE RACING Differential Seal Kit - Yamaha - Rear 25-2153-5
MOOSE RACING
$44.95A leaking differential isn't just messy—it's a threat to gear longevity and performance. This MOOSE Racing Differential Seal Kit delivers complete sealing integrity for your Yamaha rear differential, replacing worn seals before catastrophic failure...09351298- SKU:
- 09351298
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
$44.95 -
COMETIC Crankcase Oil Seal Kit - Honda C3139OS
COMETIC
$48.95Crankcase oil leaks compromise engine efficiency and create messy underbody conditions that invite contamination. The COMETIC Crankcase Oil Seal Kit addresses common Honda leak points with OEM-grade seals engineered for precise fitment and long-term...09351300- SKU:
- 09351300
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$48.95Qty in Cart: 0Quantity:Price:$48.95Subtotal: -
COMETIC Bottom End Gasket Kit - Honda C3139BE
COMETIC
$113.95A complete bottom end gasket kit is non-negotiable for any engine rebuild—missed seals lead to oil leaks, contamination, and catastrophic failure. The Cometic C3139BE delivers comprehensive coverage with every gasket, seal, and washer you need in one...09347868- SKU:
- 09347868
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
$113.95Qty in Cart: 0Quantity:Price:$113.95Subtotal: -
COMETIC Top End Gasket Kit - 98 mm - Honda C3141-EST
COMETIC
$99.95A failing top end gasket compromises compression, causes coolant seepage, and tanks performance—especially in high-output naturally aspirated or forced-induction engines. Cometic's EST gasket kit uses multi-layered steel construction with Viton rubber...09347869- SKU:
- 09347869
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$99.95 -
COMETIC Water Pump Repair Kit - Yamaha C7908WP
COMETIC
$47.95Water pump failure compromises your engine's cooling system, risking catastrophic overheating and internal damage. This Cometic repair kit supplies all the precision seals, O-rings, and bearings needed to restore your water pump to factory specifications...09347877- SKU:
- 09347877
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
$47.95Qty in Cart: 0Quantity:Price:$47.95Subtotal: -
COMETIC Top End Gasket Kit - 95 mm - Polaris C3039
COMETIC
$158.95A failing top-end gasket will compromise your engine's combustion seal and cost you power—or worse, strand you trackside. This Cometic gasket kit delivers the precision sealing your high-performance engine demands, whether you're running naturally...09347878- SKU:
- 09347878
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
$158.95Qty in Cart: 0Quantity:Price:$158.95Subtotal: -
COMETIC Top End Gasket Kit - Honda C3112
COMETIC
$108.95A failed top end gasket can sideline your engine and compromise months of tuning work. The COMETIC C3112 Top End Gasket Kit delivers the sealing integrity and heat management needed to maintain peak performance across naturally aspirated and...09347879- SKU:
- 09347879
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
$108.95Qty in Cart: 0Quantity:Price:$108.95Subtotal: -
COMETIC Bottom End Gasket Kit - Honda C3112BE
COMETIC
$126.95A complete bottom end overhaul demands precision-engineered gaskets and seals that prevent oil leakage, maintain proper compression, and ensure long-term engine reliability. The COMETIC C3112BE Bottom End Gasket Kit supplies all the critical sealing...09347880- SKU:
- 09347880
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
$126.95 -
COMETIC Top End Gasket Kit - 92 mm - Can-Am C3459-EST
COMETIC
$189.95A failed top end gasket can sideline your engine and tank your performance gains. The COMETIC C3459-EST delivers the sealing reliability demanded by high-output 4-stroke engines—whether naturally aspirated or boosted—using multi-layered steel...09347881- SKU:
- 09347881
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
$189.95 -
COMETIC Top End Gasket Kit - 94 mm - Polaris C3546-EST
COMETIC
$104.95A degraded or failing top end gasket compromises cylinder pressure, reduces power output, and risks catastrophic engine damage. The COMETIC C3546-EST delivers the sealing integrity your high-output 4-stroke demands, whether naturally aspirated or boosted...09347882- SKU:
- 09347882
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
$104.95Qty in Cart: 0Quantity:Price:$104.95Subtotal: -
COMETIC Top End Gasket Kit - 82.5 mm - Yamaha C3617
COMETIC
$122.95A failing head gasket can cost you race time and engine damage. The COMETIC Top End Gasket Kit delivers the sealing reliability you need for high-horsepower, high-boost applications—whether you're running naturally aspirated or forced induction. With...09347883- SKU:
- 09347883
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
$122.95Qty in Cart: 0Quantity:Price:$122.95Subtotal: -
COMETIC Top End Gasket Kit - 104 mm - Yamaha C3143-EST
COMETIC
$109.95A failing head gasket doesn't just leak—it compromises combustion seal integrity, reduces ring tension, and kills horsepower. The COMETIC EST Top End Gasket Kit is engineered to handle the cylinder pressures of modern high-output 4-stroke engines,...09347870- SKU:
- 09347870
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
$109.95 -
COMETIC Top End Gasket Kit - 101 mm - Honda C3156-EST
COMETIC
$99.95A failing top-end gasket kit costs you power, reliability, and race-day credibility. The COMETIC C3156-EST delivers the sealing integrity and thermal management your high-output Honda engine demands, whether you're running naturally aspirated or boosted...09347871- SKU:
- 09347871
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$99.95Qty in Cart: 0Quantity:Price:$99.95Subtotal: -
COMETIC Bottom End Gasket Kit with Oil Seals - Yamaha C7908BE
COMETIC
$92.95A complete bottom-end rebuild demands precision-engineered gaskets and seals that maintain cylinder pressure and prevent oil leakage under extreme conditions. The COMETIC C7908BE kit supplies all necessary components—gaskets, oil seals, O-rings, and...09347874- SKU:
- 09347874
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
$92.95 -
COMETIC Complete Gasket Kit - Polaris C3826
COMETIC
$424.95Engine reliability under extreme pressure demands a complete gasket solution—not piecemeal replacements that leave weak points in your seal strategy. The COMETIC Complete Gasket Kit ensures every critical sealing surface, from head gaskets to oil seals,...09347821- SKU:
- 09347821
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
$424.95
