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 Top End Kit - 1mm - Polaris 54-311-14
WSM
$187.71A worn or damaged top end directly compromises engine efficiency, compression, and overall reliability. The WSM Top End Kit gives you everything needed for a complete piston and gasket refresh,...09031410- SKU:
- 09031410
- Availability:
- Ships Same Business Day
- Weight:
- 3.05 LBS
- OVERBORE METRIC:
- +1.00 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$187.71Qty in Cart: 0Quantity:Price:$187.71Subtotal: -
WSM Top End Kit - .25mm - Yamaha 54-540-11
WSM
$143.00A complete top-end overhaul demands precision components that restore compression and reliability without compromise. This WSM Top End Kit delivers OEM-quality pistons and gaskets engineered to...09031417- SKU:
- 09031417
- Availability:
- Ships Same Business Day
- Weight:
- 2.05 LBS
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- OVERBORE METRIC:
- +0.25 MM
- RIDING STYLE:
- ATV
$143.00Qty in Cart: 0Quantity:Price:$143.00Subtotal: -
WSM Top End Kit - Standard - Yamaha 54-544-10
WSM
$206.49A top-end rebuild is critical maintenance for any 4-stroke Yamaha engine running hard—whether on the track or in demanding conditions. This WSM kit delivers OEM-quality components in a single...09031421- SKU:
- 09031421
- Availability:
- Ships Same Business Day
- Weight:
- 2.80 LBS
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- UTV
- OVERBORE METRIC:
- STANDARD
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$206.49 -
WSM Top End Kit - Standard - Kawasaki 54-255-10
WSM
$127.76A worn or damaged top end directly impacts engine compression, power delivery, and reliability. The WSM Top End Kit delivers OEM-quality components engineered to restore your engine to factory...09031381- SKU:
- 09031381
- Availability:
- Ships Same Business Day
- Weight:
- 1.55 LBS
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- OVERBORE METRIC:
- STANDARD
- UNITS:
- KIT
$127.76Qty in Cart: 0Quantity:Price:$127.76Subtotal: -
WSM Top End Kit - .25mm - Kawasaki 54-255-11
WSM
$127.76A top-end rebuild is essential maintenance for any 4-stroke Kawasaki engine operating at racing or high-performance levels, and this WSM kit eliminates the guesswork by delivering OEM-quality...09031382- SKU:
- 09031382
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- OVERBORE METRIC:
- +0.25 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$127.76Qty in Cart: 0Quantity:Price:$127.76Subtotal: -
XCELDYNE X2 Titanium Valve - Exhaust X2TEVM43000
XCELDYNE
$110.19Off-road engines demand valves that can withstand extreme temperatures and abuse without sacrificing flow characteristics. The XCELDYNE X2 Titanium Valve delivers the durability and performance you...09262557- SKU:
- 09262557
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- VALVE TRAIN KIT
- MATERIAL:
- TITANIUM
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
$110.19Qty in Cart: 0Quantity:Price:$110.19Subtotal: -
On Sale
EPI Crankshaft Seal WE522162
EPI
MSRP: $14.99Now: $13.49Was: $14.99A worn or leaking crankshaft seal will compromise engine reliability and performance on your Polaris 2-stroke ATV. The EPI WE522162 is engineered to maintain proper combustion chamber sealing,...WE522162- SKU:
- WE522162
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- SNOW
- TYPE:
- CRANKSHAFT
MSRP: $14.99Now: $13.49Was: $14.99 -
On Sale
EPI Crankshaft Bearing WE523805
EPI
MSRP: $31.99Now: $28.79Was: $31.99Crankshaft bearings are critical wear items in 2-stroke engines—when they degrade, you lose power efficiency and risk catastrophic engine failure. The EPI WE523805 is engineered to restore proper...WE523805- SKU:
- WE523805
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- APPLICATION:
- MAGNETO
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- APPLICATION:
- INSIDE PTO
- APPLICATION:
- OUTSIDE PTO
- APPLICATION:
- CRANKSHAFT
- RIDING STYLE:
- SNOW
MSRP: $31.99Now: $28.79Was: $31.99 -
On Sale
EPI Crankshaft Seal WE524120
EPI
MSRP: $21.99Now: $19.79Was: $21.99A worn or damaged crankshaft seal compromises engine compression and invites fuel and oil leakage—problems that quickly escalate into costly repairs. The EPI WE524120 restores the critical seal...WE524120- SKU:
- WE524120
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- SEAL
- TYPE:
- CRANKSHAFT
- RIDING STYLE:
- ATV
- UNITS:
- EACH
MSRP: $21.99Now: $19.79Was: $21.99Qty in Cart: 0Quantity:Price:MSRP: $21.99Now: $19.79Was: $21.99Subtotal: -
On Sale
EPI Crankshaft Bearing WE524580
EPI
MSRP: $31.99Now: $28.79Was: $31.99Crankshaft bearings are critical to engine longevity and performance in 2-stroke ATVs—worn or degraded bearings increase friction, reduce power transfer, and accelerate internal wear. The EPI...WE524580- SKU:
- WE524580
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- APPLICATION:
- CRANKSHAFT
- RIDING STYLE:
- SNOW
- APPLICATION:
- INSIDE PTO
- APPLICATION:
- OUTSIDE PTO
- APPLICATION:
- MAGNETO
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- ATV
- UNITS:
- EACH
MSRP: $31.99Now: $28.79Was: $31.99Qty in Cart: 0Quantity:Price:MSRP: $31.99Now: $28.79Was: $31.99Subtotal: -
On Sale
EPI Crankshaft Seal WE524581
EPI
MSRP: $14.99Now: $13.49Was: $14.99A compromised crankshaft seal accelerates wear on critical engine components and invites contamination into your powerplant. The EPI WE524581 delivers OEM-spec sealing performance, keeping your...WE524581- SKU:
- WE524581
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- SNOW
- TYPE:
- CRANKSHAFT
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- ATV
- UNITS:
- EACH
MSRP: $14.99Now: $13.49Was: $14.99Qty in Cart: 0Quantity:Price:MSRP: $14.99Now: $13.49Was: $14.99Subtotal: -
On Sale
EPI Crankshaft Seal WE524725
EPI
MSRP: $24.99Now: $22.49Was: $24.99A worn or failing crankshaft seal on your Polaris 2-stroke ATV will compromise engine integrity and lead to costly damage down the line. The EPI WE524725 is engineered to OEM specifications, ensuring...WE524725- SKU:
- WE524725
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- SEAL
- UNITS:
- EACH
- TYPE:
- CRANKSHAFT
- RIDING STYLE:
- ATV
MSRP: $24.99Now: $22.49Was: $24.99Qty in Cart: 0Quantity:Price:MSRP: $24.99Now: $22.49Was: $24.99Subtotal: -
On Sale
EPI Differential Seal Kit - Rear WE290101
EPI
MSRP: $26.99Now: $24.29Was: $26.99Differential seal degradation leads to fluid leakage, loss of lubrication, and catastrophic gear failure—issues that compromise both track performance and reliability. The EPI Differential Seal Kit...09351047- SKU:
- 09351047
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- TYPE:
- DIFFERENTIAL
- PRODUCT NAME:
- SEAL KIT
- UNITS:
- KIT
- RIDING STYLE:
- STREET
MSRP: $26.99Now: $24.29Was: $26.99 -
On Sale
EPI Clutch Cover Gasket WE590005
EPI
MSRP: $14.99Now: $13.49Was: $14.99Clutch cover gaskets are a maintenance item that directly impacts engine seal integrity and prevents oil seepage that can compromise clutch performance. The EPI WE590005 is a direct replacement that...09346459- SKU:
- 09346459
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- RIDING STYLE:
- UTV
- RIDING STYLE:
- ATV
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
MSRP: $14.99Now: $13.49Was: $14.99 -
On Sale
EPI Differential Seal Kit - Front WE290121
EPI
MSRP: $21.99Now: $19.79Was: $21.99Differential seal degradation is a common culprit behind fluid leaks and internal wear that can compromise your differential's longevity and performance. This EPI Differential Seal Kit gives you...09351043- SKU:
- 09351043
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- SEAL KIT
- RIDING STYLE:
- STREET
- TYPE:
- DIFFERENTIAL
- UNITS:
- KIT
MSRP: $21.99Now: $19.79Was: $21.99 -
On Sale
Wiseco Piston Kit 67mm Bore 1985-1986 Honda ATC250R TRX250R PK1077
WISECO
MSRP: $259.95Now: $221.00Was: $259.95If you're rebuilding the top end of your Honda ATC250R or TRX250R, you need pistons engineered to handle sustained high RPM and aggressive riding conditions. Wiseco's forged aluminum construction...09030341- SKU:
- 09030341
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- TYPE:
- TOP END
- MODEL:
- PRO-LITE
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 67.00 MM
- DISPLACEMENT:
- 246 CC
- RIDING STYLE:
- ATV
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE:
- +1,00 MM
- PISTON DIAMETER METRIC:
- 66.92 MM
- PRODUCT NAME:
- REBUILD KIT
MSRP: $259.95Now: $221.00Was: $259.95Qty in Cart: 0Quantity:Price:MSRP: $259.95Now: $221.00Was: $259.95Subtotal: -
On Sale
Wiseco Piston Kit for Suzuki LT80 1987-2006 PK1099
WISECO
MSRP: $182.95Now: $144.00Was: $182.95The stock piston in your LT80 is the weak link holding back peak performance and reliability. Wiseco's forged piston kit delivers the strength needed for sustained high RPM operation and competitive...09030343- SKU:
- 09030343
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE SIZE METRIC:
- 50.00 MM
- TYPE:
- TOP END
- UNITS:
- KIT
- DISPLACEMENT:
- 82 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- FORGED SERIES
- RIDING STYLE:
- ATV
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 42.00 MM
- PISTON DIAMETER METRIC:
- 49.92 MM
- PRODUCT NAME:
- REBUILD KIT
MSRP: $182.95Now: $144.00Was: $182.95 -
On Sale
Wiseco Piston Kit Yamaha YFS200 Blaster 1988-2006 68.25mm 573M06825
WISECO
MSRP: $166.95Now: $132.00Was: $166.95When your Yamaha YFS200 Blaster's original pistons show wear, compression loss and power degradation follow. The Wiseco 573M06825 piston kit restores—and can exceed—factory performance with...09102802- SKU:
- 09102802
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE SIZE METRIC:
- 68.25 MM
- MODEL:
- PRO-LITE
- BORE - OVERSIZE:
- +2,25 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 57.00 MM
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +2.25 MM
- DISPLACEMENT:
- 209 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- ATV
MSRP: $166.95Now: $132.00Was: $166.95 -
On Sale
Wiseco Piston Kit 81.00mm for Honda FL400R Pilot 1989-1990 577M08100
WISECO
MSRP: $204.95Now: $174.00Was: $204.95If you're running a Honda FL400R Pilot and want to restore lost compression or build more power, a quality piston kit is non-negotiable. The Wiseco 81.00mm Piston Kit is precision-engineered to...09102804- SKU:
- 09102804
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- BORE SIZE METRIC:
- 81.00 MM
- BORE - OVERSIZE:
- +1,00 MM
- RIDING STYLE:
- UTV
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 79.00 MM
- UNITS:
- EACH
- DISPLACEMENT:
- 397 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM
MSRP: $204.95Now: $174.00Was: $204.95Qty in Cart: 0Quantity:Price:MSRP: $204.95Now: $174.00Was: $204.95Subtotal: -
On Sale
Wiseco Engine Rebuild Kit for Honda TRX450R 2006-2009 PWR226B-100
WISECO
MSRP: $1,079.21Now: $917.00Was: $1,079.21When your Honda TRX450R's engine is showing signs of wear, a full rebuild is the most cost-effective path back to reliable performance. The Wiseco PWR226B-100 kit delivers all the critical components...09031668- SKU:
- 09031668
- Availability:
- Ships Same Business Day
- Weight:
- 15.25 LBS
- BORE SIZE METRIC:
- 95.96 MM
- UNITS:
- KIT
- RIDING STYLE:
- ATV
- TYPE:
- ENGINE
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- PRODUCT NAME:
- REBUILD KIT
MSRP: $1,079.21Now: $917.00Was: $1,079.21Qty in Cart: 0Quantity:Price:MSRP: $1,079.21Now: $917.00Was: $1,079.21Subtotal:
