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
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L.A. Sleeve Cylinder Sleeve for 1985-1986 Honda ATC250R and 1986 Honda TRX250R H845
LA SLEEVE
$143.95If your 1985–1986 Honda ATC250R or 1986 TRX250R is showing signs of worn cylinder walls—loss of compression, increased blow-by, or sluggish throttle response—a cylinder sleeve is your path to full...H845- SKU:
- H845
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- COLOR/FINISH:
- ALUMINUM
- PRODUCT NAME:
- CYLINDER SLEEVE
- BORE SIZE METRIC:
- 66.00 MM
- RIDING STYLE:
- ATV
- TYPE:
- CI
- UNITS:
- EACH
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
$143.95 -
KIBBLEWHITE Exhaust Valve Guide 30-30940
KIBBLEWHITE
$15.92Valve guide wear is a silent killer of engine performance—allowing oil to seep past the valve stem and compromising compression and efficiency. The KIBBLEWHITE Exhaust Valve Guide 30-30940 is...09260414- SKU:
- 09260414
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- INSIDE DIAMETER IMPERIAL:
- 0.1955'
- PRODUCT NAME:
- VALVE GUIDE
- RIDING STYLE:
- ATV
- SIZE IMPERIAL:
- STANDARD
- OUTSIDE DIAMETER IMPERIAL:
- 0.4360'
- APPLICATION:
- EXHAUST
- MATERIAL:
- AMPCO-45
- UNITS:
- EACH
$15.92 -
KIBBLEWHITE Intake Valve - TRX450R - 37mm 30-30751
KIBBLEWHITE
$31.01The TRX450R demands intake valves that can handle high RPM abuse while maintaining precise flow characteristics—stock valves simply can't sustain the thermal and mechanical stress of serious riding...09260140- SKU:
- 09260140
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MODEL:
- BLACK DIAMOND™
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 37.00 MM
- RIDING STYLE:
- ATV
- STEM DIAMETER IMPERIAL:
- 0.2158'
- UNITS:
- EACH
- LENGTH IMPERIAL:
- 3.325'
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 20°
$31.01 -
KIBBLEWHITE Exhaust Valve - TRX450R - 31mm 30-30754
KIBBLEWHITE
$31.01High-revving ATV engines demand valves that can withstand extreme heat cycles and maintain precise tolerances lap after lap. The KIBBLEWHITE Black Diamond™ Exhaust Valve delivers the durability and...09260142- SKU:
- 09260142
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- ATV
- TULIP ANGLE:
- 20°
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- MODEL:
- BLACK DIAMOND™
- LENGTH IMPERIAL:
- 3.325'
- STEM DIAMETER IMPERIAL:
- 0.2151'
- HEAD DIAMETER METRIC:
- 31.00 MM
$31.01 -
KIBBLEWHITE Valve Guide 60-60290
KIBBLEWHITE
$15.92Valve guide wear compromises combustion chamber sealing, leading to increased oil consumption, blow-by, and reduced power output. The KIBBLEWHITE 60-60290 replaces worn guides with...09260239- SKU:
- 09260239
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- OUTSIDE DIAMETER IMPERIAL:
- 0.4170'
- PRODUCT NAME:
- VALVE GUIDE
- RIDING STYLE:
- ATV
- SIZE IMPERIAL:
- STANDARD
- INSIDE DIAMETER IMPERIAL:
- 0.2155'
- MATERIAL:
- C630 BRONZE
- APPLICATION:
- INTAKE
- UNITS:
- EACH
$15.92 -
KIBBLEWHITE Valve Guide 60-60300
KIBBLEWHITE
$15.92Valve guide wear directly impacts combustion sealing, oil consumption, and overall engine reliability—especially under high RPM racing conditions. The Kibblewhite 60-60300 delivers precision fitment...09260240- SKU:
- 09260240
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- APPLICATION:
- EXHAUST
- UNITS:
- EACH
- INSIDE DIAMETER IMPERIAL:
- 0.2155'
- MATERIAL:
- C630 BRONZE
- OUTSIDE DIAMETER IMPERIAL:
- 0.4170'
- RIDING STYLE:
- ATV
- SIZE IMPERIAL:
- STANDARD
- PRODUCT NAME:
- VALVE GUIDE
$15.92Qty in Cart: 0Quantity:Price:$15.92Subtotal: -
KIBBLEWHITE Intake Valve - LTR450 - Standard 60-60310
KIBBLEWHITE
$37.55Factory intake valves wear quickly under high-RPM conditions, leading to loss of compression, poor fuel economy, and potential engine damage. The Kibblewhite Black Diamond™ intake valve delivers the...09260245- SKU:
- 09260245
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- LENGTH IMPERIAL:
- 3.210'
- HEAD DIAMETER METRIC:
- 36.00 MM
- MODEL:
- BLACK DIAMOND™
- STEM DIAMETER IMPERIAL:
- 0.2155'
- APPLICATION:
- INTAKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- ATV
- TULIP ANGLE:
- 20°
- UNITS:
- EACH
$37.55 -
Cylinder Works Honda TRX450R 2004-2005 Standard Bore Cylinder 10003
CYLINDER WORKS
$434.95If you're running a Honda TRX450R, cylinder wear is inevitable under racing conditions or sustained high-RPM use. This Cylinder Works replacement delivers OEM-equivalent performance with superior...09310138- SKU:
- 09310138
- Availability:
- Ships Same Business Day
- Weight:
- 3.55 LBS
- DISPLACEMENT:
- 449 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 94.00 MM
- UNITS:
- EACH
- RIDING STYLE:
- ATV
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- CYLINDER DIAMETER:
- 94,00 MM
- OVERBORE METRIC:
- STANDARD
- STYLE:
- STANDARD
$434.95 -
MOOSE UTILITY Impeller Water Pump MSE - Polaris 16-1201
MOOSE UTILITY
$32.95Stock plastic water pumps are a common failure point in demanding riding conditions, leaving you stranded or facing costly engine damage. The MOOSE UTILITY Impeller Water Pump replaces that weak link...09320235- SKU:
- 09320235
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- TYPE:
- WATER PUMP
- PRODUCT NAME:
- IMPELLER
$32.95 -
KIBBLEWHITE Intake Valve - Standard - Honda 30-30950T
KIBBLEWHITE
$92.51Intake valve performance directly impacts combustion efficiency, fuel atomization, and overall engine responsiveness. KIBBLEWHITE's Tensilite® valves are engineered to handle sustained high-RPM...09262923- SKU:
- 09262923
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- HEAD DIAMETER METRIC:
- 36.00 MM
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
- MODEL:
- TENSILITE®
- RIDING STYLE:
- ATV
- STEM DIAMETER IMPERIAL:
- 0.2158'
- UNITS:
- EACH
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 20°
$92.51 -
On Sale
Wossner Piston Kit for Polaris 250 Trail Boss 1985-2005 8094D200
WOSSNER
MSRP: $132.00Now: $125.40Was: $132.00The Wossner Piston Kit 8094D200 is engineered to restore lost compression, reduce blow-by, and unlock the full potential of your Polaris 250 Trail Boss engine. Whether you're rebuilding after...09105513- SKU:
- 09105513
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE - OVERSIZE:
- +2,00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON SIZE METRIC:
- 73.93 MM
- RIDING STYLE:
- ATV
- DISPLACEMENT:
- 244 CC
- TYPE:
- DUAL RING
- BORE SIZE METRIC:
- 74.00 MM
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
MSRP: $132.00Now: $125.40Was: $132.00Qty in Cart: 0Quantity:Price:MSRP: $132.00Now: $125.40Was: $132.00Subtotal: -
On Sale
Wossner Piston Kit for Polaris 250 Trail Boss 1985-2005 8094DA
WOSSNER
MSRP: $122.00Now: $115.90Was: $122.00Stock pistons in your Polaris 250 Trail Boss can't handle sustained high-RPM running or modified engine builds—they'll fail when you need reliability most. The Wossner 8094DA delivers the durability...09105514- SKU:
- 09105514
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 71.93 MM
- UNITS:
- KIT
- BORE SIZE METRIC:
- 72.00 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- TYPE:
- DUAL RING
- DISPLACEMENT:
- 244 CC
MSRP: $122.00Now: $115.90Was: $122.00Qty in Cart: 0Quantity:Price:MSRP: $122.00Now: $115.90Was: $122.00Subtotal: -
On Sale
Wossner Piston Kit Yamaha RD350 1973-1975 RD400 1976-1979 RZ350 1984-1985 YFZ350 Banshee 1987-2006 8075D200
WOSSNER
MSRP: $132.00Now: $125.40Was: $132.00If you're running a 2-stroke Yamaha RD or YFZ Banshee at the limit, piston failure isn't just inconvenient—it's expensive. The Wossner 8075D200 is engineered to handle the thermal stress and...09104796- SKU:
- 09104796
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 65.94 MM
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- DISPLACEMENT:
- 347 CC
- TYPE:
- DUAL RING
- BORE - OVERSIZE:
- +2,00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 66.00 MM
- DISPLACEMENT:
- 398 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
MSRP: $132.00Now: $125.40Was: $132.00Qty in Cart: 0Quantity:Price:MSRP: $132.00Now: $125.40Was: $132.00Subtotal: -
PARTS UNLIMITED Oil Filter O-Rings - Bombardier - 5-Pack 420850500
PARTS UNLIMITED
$5.05Oil filter O-rings are critical wear items that degrade with every thermal cycle, compromising your engine's filtration seal and risking contamination in your Bombardier 4 TEC. Replacing them during...07120367- SKU:
- 07120367
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- COLOR/FINISH:
- ORANGE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- O-RING SET
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- TYPE:
- OIL FILTER
- UNITS:
- 5 PACK
- BASE COLOR:
- ORANGE
$5.05 -
PARTS UNLIMITED Oil Filter 0452462
PARTS UNLIMITED
$11.17Consistent oil filtration is fundamental to engine longevity and performance. The PARTS UNLIMITED Oil Filter 0452462 uses premium filtration media and robust construction to trap contaminants while...07120175- SKU:
- 07120175
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- FILTER MEDIA MATERIAL:
- PAPER
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- BASE COLOR:
- BLACK
- COLOR/FINISH:
- BLACK
- STYLE:
- STANDARD
- PRODUCT NAME:
- OIL FILTER
- TYPE:
- SPIN-ON
$11.17Qty in Cart: 0Quantity:Price:$11.17Subtotal: -
On Sale
Wiseco Piston Kit Yamaha YFM660R 2001-2005 102mm 11:1 4811M10200
WISECO
MSRP: $274.95Now: $234.00Was: $274.95If you're running a Yamaha YFM660R and want to extract genuine performance gains, a properly-sized piston kit is fundamental—this Wiseco unit delivers the overbore capacity and compression ratio...09100287- SKU:
- 09100287
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- STROKE LENGTH METRIC:
- 84.00 MM
- UNITS:
- EACH
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 102.00 MM
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- ARMORGLIDE®
- BORE - OVERSIZE METRIC:
- +2.00 MM
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- DISPLACEMENT:
- 686 CC
- PISTON MATERIAL:
- FORGED
MSRP: $274.95Now: $234.00Was: $274.95Qty in Cart: 0Quantity:Price:MSRP: $274.95Now: $234.00Was: $274.95Subtotal: -
On Sale
Wiseco Piston Kit for Honda TRX450R 2006-2009 PK1413
WISECO
MSRP: $349.95Now: $297.00Was: $349.95If you're running your TRX450R hard on the track or trail, factory pistons won't cut it. The Wiseco PK1413 piston kit delivers the strength and thermal stability you need to push higher RPMs without...09030479- SKU:
- 09030479
- Availability:
- Ships Same Business Day
- Weight:
- 1.80 LBS
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- TYPE:
- TOP END
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- PISTON DIAMETER METRIC:
- STANDARD
- SKIRT COATING:
- ARMORGLIDE®
- STROKE LENGTH METRIC:
- 64.80 MM
- UNITS:
- KIT
- BORE SIZE METRIC:
- 96.00 MM
- PRODUCT NAME:
- REBUILD KIT
- DISPLACEMENT:
- 450 CC
- MODEL:
- FORGED SERIES
MSRP: $349.95Now: $297.00Was: $349.95Qty in Cart: 0Quantity:Price:MSRP: $349.95Now: $297.00Was: $349.95Subtotal: -
K & N Oil Filter KN-114
K & N
$11.99If you're running synthetic or synthetic-blend oils in a high-performance engine, you need a filter built to handle them—and standard filters simply aren't engineered for the job. The K&N KN-114 uses...07120453- SKU:
- 07120453
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- LENGTH METRIC:
- 46 MM
- COLOR/FINISH:
- RED
- FILTER MEDIA MATERIAL:
- SYNTHETIC
- PRODUCT NAME:
- OIL FILTER
- STYLE:
- STANDARD
- TYPE:
- CARTRIDGE
- BASE COLOR:
- RED
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- BASE FINISH:
- NATURAL
$11.99 -
MOOSE RACING Exhaust Gasket Kit - Yamaha 823091
MOOSE RACING
$10.16A degraded exhaust gasket is a silent performance killer—allowing unmetered air into your system, throwing off your fuel mixture, and bleeding horsepower you've worked hard to achieve. The MOOSE...09345497- SKU:
- 09345497
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$10.16 -
MOOSE RACING Motor Gasket Kit with Seal - Polaris 300 811807
MOOSE RACING
$42.15A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work or your wallet. MOOSE Racing delivers OEM-equivalent fitment and durability at a...M811807- SKU:
- M811807
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- RIDING STYLE:
- ATV
- PRODUCT NAME:
- GASKET
- TYPE:
- COMPLETE
- UNITS:
- KIT
- TYPE:
- ENGINE
$42.15Qty in Cart: 0Quantity:Price:$42.15Subtotal:
