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 Motor Gasket Kit with Seal - TRX300EX 811801
MOOSE RACING
$87.21A complete engine and transmission rebuild requires precision gaskets and seals that won't compromise performance or reliability. This Moose Racing kit eliminates the headache of sourcing individual...M811801- SKU:
- M811801
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- COMPLETE
- UNITS:
- KIT
- RIDING STYLE:
- ATV
- TYPE:
- ENGINE
$87.21 -
MOOSE RACING Motor Gasket Kit with Seal - ATC/TRX 811802
MOOSE RACING
$100.84A complete engine and transmission rebuild demands gasket and seal integrity—any compromise risks catastrophic failure and wasted labor. The MOOSE RACING Motor Gasket Kit delivers OEM-quality seals...M811802- SKU:
- M811802
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- COMPLETE
- UNITS:
- KIT
- RIDING STYLE:
- ATV
- TYPE:
- ENGINE
$100.84 -
MOOSE RACING Motor Gasket Kit with Seal - LT230E 811809
MOOSE RACING
$57.38A complete engine and transmission rebuild requires precision-fit gaskets and seals that won't compromise your performance or longevity. This Moose Racing Motor Gasket Kit delivers OEM-quality...M811809- SKU:
- M811809
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- RIDING STYLE:
- ATV
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- TYPE:
- COMPLETE
- UNITS:
- KIT
$57.38 -
MOOSE RACING Motor Gasket Kit with Seal - YSF200 811811
MOOSE RACING
$82.84A complete engine and transmission rebuild demands precision components that won't compromise your work or your budget. This MOOSE RACING gasket and seal kit eliminates the guesswork by providing...M811811- SKU:
- M811811
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- TYPE:
- COMPLETE
- UNITS:
- KIT
- RIDING STYLE:
- ATV
$82.84 -
MOOSE RACING Motor Gasket Kit with Seal - YFZ350 811812
MOOSE RACING
$120.70Engine and transmission rebuilds demand precision—using mismatched or worn gaskets invites oil leaks, compression loss, and catastrophic failure. This Moose Racing Motor Gasket Kit eliminates...M811812- SKU:
- M811812
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- TYPE:
- COMPLETE
- UNITS:
- KIT
- RIDING STYLE:
- ATV
$120.70 -
MOOSE RACING Motor Gasket Kit with Seal - YFM350 811813
MOOSE RACING
$124.38A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise your YFM350's integrity. This Moose Racing kit eliminates the guesswork and expense of...M811813- SKU:
- M811813
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- RIDING STYLE:
- ATV
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- TYPE:
- COMPLETE
- UNITS:
- KIT
$124.38Qty in Cart: 0Quantity:Price:$124.38Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - ATC/TRX250 811815
MOOSE RACING
$90.04A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work—and OEM kits command premium pricing. The MOOSE RACING Motor Gasket Kit delivers genuine...M811815- SKU:
- M811815
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ATV
- TYPE:
- COMPLETE
- UNITS:
- KIT
- TYPE:
- ENGINE
$90.04 -
LA Sleeve Cylinder Rebuild Kit for 1994-1999 Polaris Xplorer 300 LAS-5273K
LA SLEEVE
$395.95Your Polaris Xplorer 300 engine relies on precise tolerances and quality materials to deliver consistent power—and OEM components wear. This complete sleeve and piston rebuild kit restores...09310363- SKU:
- 09310363
- Availability:
- Ships Same Business Day
- Weight:
- 2.65 LBS
- MATERIAL:
- IRON
- RIDING STYLE:
- ATV
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- CYLINDER
- UNITS:
- KIT
$395.95Qty in Cart: 0Quantity:Price:$395.95Subtotal: -
LA Sleeve Sleeve and Piston Kit Yamaha YFM350 Grizzly 2007-2010 LAS-5024K
LA SLEEVE
$302.95If you're running a 2007-2010 Yamaha YFM350 Grizzly, a worn top-end directly impacts power delivery and throttle response. This LA Sleeve Sleeve and Piston Kit addresses ring blow-by and compression...09310366- SKU:
- 09310366
- Availability:
- Ships Same Business Day
- Weight:
- 3.68 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- CYLINDER
- UNITS:
- KIT
- MATERIAL:
- IRON
- RIDING STYLE:
- ATV
$302.95 -
KIBBLEWHITE Valve Spring Kit 30-30920
KIBBLEWHITE
$222.36Valve springs are the unsung foundation of any high-revving engine—weak or worn springs lead to valve float, lost compression, and catastrophic engine damage. The Kibblewhite 30-30920 delivers the...09260411- SKU:
- 09260411
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- ATV
- SPRING LIFT:
- 0,440'
- SPRING LIFT IMPERIAL:
- 0.440'
- SPRING OPEN PRESSURE:
- INTAKE 147 LB, EXHAUST 203 LB
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- SPRING SEAT PRESSURE:
- INTAKE 40 LB, EXHAUST 70 LB
- TYPE:
- VALVE
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
- PRODUCT NAME:
- SPRING KIT
$222.36 -
KIBBLEWHITE Intake Valve - TRX450R - 37mm 30-30951
KIBBLEWHITE
$31.01Stock intake valves are a common wear point in high-revving ATV engines, leading to performance loss and reliability issues over time. Kibblewhite's Black Diamond™ intake valve delivers race-proven...09260417- SKU:
- 09260417
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- LENGTH IMPERIAL:
- 3.325'
- STEM DIAMETER IMPERIAL:
- 0.2158'
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- VALVE
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 37.00 MM
- MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- ATV
- TULIP ANGLE:
- 20°
- UNITS:
- EACH
$31.01 -
KIBBLEWHITE Intake Valve 30-30088
KIBBLEWHITE
$54.10High-revving engines demand intake valves that can handle sustained abuse without sacrificing flow or reliability. The KIBBLEWHITE Black Diamond™ intake valve delivers the durability and precision...KW3030088- SKU:
- KW3030088
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- MODEL:
- BLACK DIAMOND™
- STEM DIAMETER IMPERIAL:
- 0.2155'
- TULIP ANGLE:
- 23°
- UNITS:
- EACH
- HEAD DIAMETER METRIC:
- 25.50 MM
- LENGTH IMPERIAL:
- 3.680'
- MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- ATV
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE
$54.10 -
KIBBLEWHITE Valve Guide 82-82030
KIBBLEWHITE
$26.43Valve guides are critical to maintaining proper valve seat concentricity and oil control in high-performance engines—inadequate guides lead to valve drift, excessive wear, and combustion leakage that...09260175- SKU:
- 09260175
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- VALVE GUIDE
- APPLICATION:
- EXHAUST
- OUTSIDE DIAMETER IMPERIAL:
- 0.4160'
- SIZE IMPERIAL:
- STANDARD
- INSIDE DIAMETER IMPERIAL:
- 0.2345'
- MATERIAL:
- C630 BRONZE
- APPLICATION:
- INTAKE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$26.43Qty in Cart: 0Quantity:Price:$26.43Subtotal: -
KIBBLEWHITE Intake Valve - Polaris 500 - Standard 82-82052
KIBBLEWHITE
$37.55If you're pushing your Polaris 500 to the limit, your intake valves are working harder than almost any other component in your engine. Stock valves wear quickly under sustained performance demands,...09260179- SKU:
- 09260179
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- LENGTH IMPERIAL:
- 4.030'
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 37.00 MM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 20°
- MODEL:
- BLACK DIAMOND™
- STEM DIAMETER IMPERIAL:
- 0.2345'
$37.55 -
KIBBLEWHITE Valve Spring Kit 30-30720
KIBBLEWHITE
$222.36Valve spring failure is one of the quickest ways to turn a race day into a nightmare—and stock springs simply aren't engineered to handle sustained high-RPM loads or aggressive cam profiles. The...09260138- SKU:
- 09260138
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- APPLICATION:
- EXHAUST
- SPRING LIFT:
- 0,440'
- SPRING LIFT IMPERIAL:
- 0.440'
- SPRING SEAT PRESSURE:
- INTAKE 40 LB, EXHAUST 70 LB
- MATERIAL:
- TITANIUM
- PRODUCT NAME:
- SPRING KIT
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- RIDING STYLE:
- ATV
- SPRING OPEN PRESSURE:
- INTAKE 147 LB, EXHAUST 203 LB
- TYPE:
- VALVE
$222.36 -
KIBBLEWHITE Intake Valve - TRX450R - 36mm 30-30750
KIBBLEWHITE
$31.01Stock intake valves in high-performance applications wear prematurely under extreme combustion pressures and heat cycles. The Kibblewhite Black Diamond™ intake valve for your TRX450R is engineered to...09260139- SKU:
- 09260139
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- LENGTH IMPERIAL:
- 3.315'
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 20°
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 36.00 MM
- RIDING STYLE:
- ATV
- STEM DIAMETER IMPERIAL:
- 0.2158'
- UNITS:
- EACH
$31.01 -
KIBBLEWHITE Exhaust Valve - TRX450R - 30mm 30-30753
KIBBLEWHITE
$31.01If you're running a TRX450R at the track or trail, valve degradation directly impacts combustion efficiency and top-end reliability. The Kibblewhite Black Diamond™ exhaust valve delivers the...09260141- SKU:
- 09260141
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- HEAD DIAMETER METRIC:
- 30.00 MM
- LENGTH IMPERIAL:
- 3.315'
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- ATV
- TULIP ANGLE:
- 20°
- UNITS:
- EACH
- STEM DIAMETER IMPERIAL:
- 0.2151'
- APPLICATION:
- EXHAUST
- MODEL:
- BLACK DIAMOND™
$31.01 -
KIBBLEWHITE Valve Spring Kit 60-60280
KIBBLEWHITE
$235.67Valve spring degradation is one of the most common failure points in high-performance engines, especially under sustained RPM and forced induction. The KIBBLEWHITE Valve Spring Kit 60-60280 delivers...09260241- SKU:
- 09260241
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
- SPRING SEAT PRESSURE:
- INTAKE 61 LB, EXHAUST 56 LB
- UNITS:
- KIT
- MATERIAL:
- STEEL
- SPRING LIFT IMPERIAL:
- 0.415'
- TYPE:
- VALVE
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
- RIDING STYLE:
- ATV
- SPRING OPEN PRESSURE:
- INTAKE 168 LB, EXHAUST 157 LB
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- SPRING KIT
- SPRING LIFT:
- 0,415'
$235.67 -
KIBBLEWHITE Exhaust Valve - LTR 450 - Standard 60-60313
KIBBLEWHITE
$37.55Stock valves wear down under sustained high RPM operation, causing compression loss and performance degradation. The KIBBLEWHITE Exhaust Valve for LTR 450 engines delivers the durability and...09260246- SKU:
- 09260246
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- EXHAUST
- LENGTH IMPERIAL:
- 3.190'
- MODEL:
- BLACK DIAMOND™
- HEAD DIAMETER METRIC:
- 29.00 MM
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- ATV
- STEM DIAMETER IMPERIAL:
- 0.2150'
- TULIP ANGLE:
- 20°
- UNITS:
- EACH
$37.55 -
KIBBLEWHITE Valve Spring Kit 80-80410
KIBBLEWHITE
$178.19Valve spring performance directly impacts your engine's ability to maintain valve control under high RPM conditions, preventing float and ensuring consistent combustion. The Kibblewhite 80-80410...09260250- SKU:
- 09260250
- Availability:
- Ships Same Business Day
- Weight:
- 0.37 LBS
- SPRING LIFT IMPERIAL:
- 0.480'
- MATERIAL:
- TITANIUM
- PRODUCT NAME:
- SPRING KIT
- SPRING LIFT:
- 0,480'
- APPLICATION:
- EXHAUST
- SPRING SEAT PRESSURE:
- 54 LB
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- RIDING STYLE:
- ATV
- SPRING OPEN PRESSURE:
- 195 LB
- TYPE:
- VALVE
- UNITS:
- KIT
$178.19
