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
-
MOOSE RACING Top End Gasket Kit - Kawasaki 810880
MOOSE RACING
$123.32A top-end rebuild demands precision and reliability—this gasket kit delivers both at a fraction of OEM pricing. Whether you're replacing a worn piston or refreshing your engine after hard use, Moose...09340694- SKU:
- 09340694
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- UNITS:
- KIT
- RIDING STYLE:
- ATV
$123.32Qty in Cart: 0Quantity:Price:$123.32Subtotal: -
MOOSE RACING Complete Motor Gasket Kit - Rubicon 500 808843
MOOSE RACING
$152.48A complete engine and transmission rebuild demands precision gaskets and seals that won't fail under load. The MOOSE RACING Complete Motor Gasket Kit eliminates the guesswork and cost of sourcing...09340424- SKU:
- 09340424
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
- RIDING STYLE:
- ATV
- TYPE:
- COMPLETE
- UNITS:
- KIT
$152.48Qty in Cart: 0Quantity:Price:$152.48Subtotal: -
MOOSE RACING Top End Gasket Kit - LT 250 R 810834
MOOSE RACING
$29.14When you're rebuilding a top end, precision matters. The MOOSE RACING Top End Gasket Kit delivers OEM-quality seals and gaskets at a fraction of the cost, so you can confidently complete your engine...M810834- SKU:
- M810834
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- UNITS:
- KIT
- RIDING STYLE:
- ATV
$29.14Qty in Cart: 0Quantity:Price:$29.14Subtotal: -
MOOSE RACING Motor Seals - KEF 300 822241
MOOSE RACING
$20.92Engine and transmission seals are critical to maintaining oil pressure, preventing leaks, and protecting internal components from contamination. OEM replacement seals often carry premium pricing, but...09350379- SKU:
- 09350379
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- RIDING STYLE:
- ATV
- TYPE:
- OIL
- APPLICATION:
- ENGINE
- PRODUCT NAME:
- SEAL
- UNITS:
- SET
$20.92 -
Cylinder Works Standard Bore Cylinder for Polaris General 1000 2017-2022 60006
CYLINDER WORKS
$653.95Stock cylinders wear down with use, losing compression and throttle response over time. The Cylinder Works Standard Bore Cylinder gives you a true OEM-equivalent replacement without the downtime and...09310730- SKU:
- 09310730
- Availability:
- Ships Same Business Day
- Weight:
- 6.85 LBS
- UNITS:
- EACH
- CYLINDER DIAMETER METRIC:
- 93.00 MM
- ENGINE TYPE:
- 4-CYCLE
- CYLINDER DIAMETER:
- 93,00 MM
- RIDING STYLE:
- UTV
- STYLE:
- STANDARD
- PRODUCT NAME:
- CYLINDER
$653.95 -
Cylinder Works Standard Bore Cylinder Kit for Polaris General 1000 EPS 2017-2022 60006-K02
CYLINDER WORKS
$1,120.95If you're running a Polaris General 1000 EPS and noticing wear on your cylinder or seeking a reliable replacement that matches OEM performance, the Cylinder Works Standard Bore Kit delivers exactly...09310731- SKU:
- 09310731
- Availability:
- Ships Same Business Day
- Weight:
- 10.01 LBS
- BORE SIZE METRIC:
- 93.00 MM
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER DIAMETER:
- 93,00 MM
- RIDING STYLE:
- UTV
- UNITS:
- KIT
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 93.00 MM
- STYLE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 11.5:1
- ENGINE TYPE:
- 4-CYCLE
$1,120.95 -
On Sale
KIBBLEWHITE Intake Valve - Raptor 700 - 39mm 80-80431
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $37.55A stock intake valve won't cut it if you're pushing your Raptor 700 to its limits. KIBBLEWHITE's Black Diamond™ valves are engineered to handle sustained high RPM operation with the durability and...09260254- SKU:
- 09260254
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- LENGTH IMPERIAL:
- 4.010'
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 11°
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 39.00 MM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- STEM DIAMETER IMPERIAL:
- 0.2355'
MSRP: $37.55Now: $33.80Was: $37.55 -
MOOSE RACING Top End Gasket - Bearcat 400/454 810800
MOOSE RACING
$43.80A top-end rebuild demands precision gaskets and seals that won't fail under compression and heat—and OEM replacements can drain your budget fast. This complete Moose Racing gasket set gives you every...M810800- SKU:
- M810800
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ATV
- TYPE:
- TOP END
- UNITS:
- KIT
$43.80 -
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
$143.95Qty in Cart: 0Quantity:Price:$143.95Subtotal: -
On Sale
KIBBLEWHITE Exhaust Valve Guide 30-30940
KIBBLEWHITE
MSRP: $15.92Now: $14.33Was: $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
MSRP: $15.92Now: $14.33Was: $15.92 -
On Sale
KIBBLEWHITE Intake Valve - TRX450R - 37mm 30-30751
KIBBLEWHITE
MSRP: $31.01Now: $27.91Was: $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°
MSRP: $31.01Now: $27.91Was: $31.01 -
On Sale
KIBBLEWHITE Exhaust Valve - TRX450R - 31mm 30-30754
KIBBLEWHITE
MSRP: $31.01Now: $27.91Was: $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
MSRP: $31.01Now: $27.91Was: $31.01 -
On Sale
KIBBLEWHITE Valve Guide 60-60290
KIBBLEWHITE
MSRP: $15.92Now: $14.33Was: $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
MSRP: $15.92Now: $14.33Was: $15.92Qty in Cart: 0Quantity:Price:MSRP: $15.92Now: $14.33Was: $15.92Subtotal: -
On Sale
KIBBLEWHITE Valve Guide 60-60300
KIBBLEWHITE
MSRP: $15.92Now: $14.33Was: $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
MSRP: $15.92Now: $14.33Was: $15.92Qty in Cart: 0Quantity:Price:MSRP: $15.92Now: $14.33Was: $15.92Subtotal: -
On Sale
KIBBLEWHITE Intake Valve - LTR450 - Standard 60-60310
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $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
MSRP: $37.55Now: $33.80Was: $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
$434.95Qty in Cart: 0Quantity:Price:$434.95Subtotal: -
Cylinder Works Big Bore Gasket Kit for 2006-2009 Honda TRX450R 11005-G01
CYLINDER WORKS
$90.95If you're running a 2006-2009 Honda TRX450R and want measurable gains in horsepower and throttle response, a big bore kit is one of the most direct paths to real performance. This Cylinder Works...09341700- SKU:
- 09341700
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- BORE SIZE METRIC:
- OVERSIZED (+3.00 MM)
- MATERIAL:
- NICKEL SILICON CARBIDE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- STYLE:
- BIG BORE
- UNITS:
- KIT
- TYPE:
- TOP END
$90.95Qty in Cart: 0Quantity:Price:$90.95Subtotal: -
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 -
On Sale
KIBBLEWHITE Intake Valve - Standard - Honda 30-30950T
KIBBLEWHITE
MSRP: $92.51Now: $83.26Was: $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°
MSRP: $92.51Now: $83.26Was: $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:
