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
-
On Sale
ATHENA Top End Gasket Kit - Polaris P400427600005
ATHENA
MSRP: $92.95Now: $84.00Was: $92.95Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during midseason. Gives the rider a choice of using standard gas with stock compression, or race gas with a higher compression. Kits do not...09344893- SKU:
- 09344893
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- TYPE:
- TOP END
MSRP: $92.95Now: $84.00Was: $92.95 -
On Sale
ATHENA Complete Gasket Kit - Polaris P400427850005
ATHENA
MSRP: $105.95Now: $95.00Was: $105.95Superior-quality gasket sets from Athena, Head gaskets feature rubber-coated spring steel construction, Soft steel base gaskets are rubber coated, Steel core materials feature high springback and superior tensile strength, Revolutionary transparent...09344894- SKU:
- 09344894
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- TYPE:
- COMPLETE
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- UTV
MSRP: $105.95Now: $95.00Was: $105.95 -
On Sale
ATHENA Complete Gasket Kit - Polaris P400427870014
ATHENA
MSRP: $132.95Now: $120.00Was: $132.95Superior-quality gasket sets from Athena, Head gaskets feature rubber-coated spring steel construction, Soft steel base gaskets are rubber coated, Steel core materials feature high springback and superior tensile strength, Revolutionary transparent...09344896- SKU:
- 09344896
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- UNITS:
- KIT
- ENGINE TYPE:
- -
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
MSRP: $132.95Now: $120.00Was: $132.95 -
On Sale
ATHENA Top End Gasket Kit - Suzuki P400510600056
ATHENA
MSRP: $149.95Now: $135.00Was: $149.95Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during midseason. Gives the rider a choice of using standard gas with stock compression, or race gas with a higher compression. Kits do not...09344902- SKU:
- 09344902
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- TYPE:
- TOP END
MSRP: $149.95Now: $135.00Was: $149.95 -
On Sale
ATHENA Top End Gasket Kit - Yamaha P400485600063
ATHENA
MSRP: $153.95Now: $139.00Was: $153.95Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during midseason. Gives the rider a choice of using standard gas with stock compression, or race gas with a higher compression. Kits do not...09344903- SKU:
- 09344903
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
MSRP: $153.95Now: $139.00Was: $153.95 -
On Sale
ATHENA Top End Gasket Kit - Polaris P400427600015
ATHENA
MSRP: $73.95Now: $67.00Was: $73.95Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during midseason. Gives the rider a choice of using standard gas with stock compression, or race gas with a higher compression. Kits do not...09344905- SKU:
- 09344905
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- SILICONE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- TYPE:
- TOP END
MSRP: $73.95Now: $67.00Was: $73.95 -
On Sale
ATHENA Top End Gasket Kit - Polaris P400427620021
ATHENA
MSRP: $139.95Now: $126.00Was: $139.95Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during midseason. Gives the rider a choice of using standard gas with stock compression, or race gas with a higher compression. Kits do not...09343194- SKU:
- 09343194
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- MATERIAL:
- STEEL
- RIDING STYLE:
- UTV
- TYPE:
- TOP END
- UNITS:
- KIT
MSRP: $139.95Now: $126.00Was: $139.95 -
On Sale
ATHENA Top End Gasket Kit - Polaris P400427620022
ATHENA
MSRP: $139.95Now: $126.00Was: $139.95Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during midseason. Gives the rider a choice of using standard gas with stock compression, or race gas with a higher compression. Kits do not...09343196- SKU:
- 09343196
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
- MATERIAL:
- STEEL
- RIDING STYLE:
- UTV
- UNITS:
- KIT
MSRP: $139.95Now: $126.00Was: $139.95 -
On Sale
ATHENA Piston Kit S4C06800001A
ATHENA
MSRP: $134.95Now: $121.00Was: $134.95Includes rings, clips and pin, Easy-to-follow step-by-step installation instructions09101332- SKU:
- 09101332
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- PISTON DIAMETER METRIC:
- 67.95 MM
- PISTON SIZE METRIC:
- STANDARD SIZE A
- PRODUCT NAME:
- PISTON
- STYLE:
- CAST BIG BORE
- COMPRESSION RATIO IMPERIAL:
- 11.9:1
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
MSRP: $134.95Now: $121.00Was: $134.95 -
On Sale
ATHENA Piston Kit S4C06800001B
ATHENA
MSRP: $134.95Now: $121.00Was: $134.95Includes rings, clips and pin, Easy-to-follow step-by-step installation instructions09101333- SKU:
- 09101333
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- PISTON DIAMETER METRIC:
- 67.96 MM
- PRODUCT NAME:
- PISTON
- STYLE:
- CAST BIG BORE
- ENGINE TYPE:
- 2-STROKE
- PISTON SIZE METRIC:
- STANDARD SIZE B
- COMPRESSION RATIO IMPERIAL:
- 11.9:1
- RIDING STYLE:
- ATV
- UNITS:
- EACH
MSRP: $134.95Now: $121.00Was: $134.95Qty in Cart: 0Quantity:Price:MSRP: $134.95Now: $121.00Was: $134.95Subtotal: -
On Sale
ATHENA Cylinder Kit - TRX450R - 490C P400210100017
ATHENA
MSRP: $1,227.95Now: $1,105.00Was: $1,227.95Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets, Forged piston with molybdenum coating, Special gasket kit, Easy-to-follow step-by-step installation instructions, All are bolt-on; no machining required09310667- SKU:
- 09310667
- Availability:
- Ships Same Business Day
- Weight:
- 4.45 LBS
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- DISPLACEMENT:
- 480 CC
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- ATV
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- BORE SIZE METRIC:
- 100.00 MM
MSRP: $1,227.95Now: $1,105.00Was: $1,227.95 -
On Sale
ATHENA Top End Gasket Kit - Polaris P400427620010
ATHENA
MSRP: $70.95Now: $64.00Was: $70.95Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during midseason. Gives the rider a choice of using standard gas with stock compression, or race gas with a higher compression. Kits do not...09342173- SKU:
- 09342173
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- SILICONE
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
MSRP: $70.95Now: $64.00Was: $70.95Qty in Cart: 0Quantity:Price:MSRP: $70.95Now: $64.00Was: $70.95Subtotal: -
On Sale
ATHENA Top End Gasket Kit - Polaris P400427620013
ATHENA
MSRP: $131.95Now: $119.00Was: $131.95Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during midseason. Gives the rider a choice of using standard gas with stock compression, or race gas with a higher compression. Kits do not...09342175- SKU:
- 09342175
- Availability:
- Ships Same Business Day
- Weight:
- 0.33 LBS
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- TYPE:
- TOP END
MSRP: $131.95Now: $119.00Was: $131.95 -
On Sale
ATHENA Gasket Kit - YFZ350 P400485160021
ATHENA
MSRP: $41.95Now: $38.00Was: $41.95Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets, Forged piston with molybdenum coating, Special gasket kit, Easy-to-follow step-by-step installation instructions, All are bolt-on; no machining required09342194- SKU:
- 09342194
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- BORE SIZE METRIC:
- 68.00 MM
- RIDING STYLE:
- ATV
- TYPE:
- TOP END
- UNITS:
- KIT
- BORE SIZE:
- 68,00 MM
- PRODUCT NAME:
- GASKET KIT
MSRP: $41.95Now: $38.00Was: $41.95 -
On Sale
ATHENA Top End Gasket Kit - Polaris P400427600001
ATHENA
MSRP: $31.95Now: $29.00Was: $31.95Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during midseason. Gives the rider a choice of using standard gas with stock compression, or race gas with a higher compression. Kits do not...400427600001- SKU:
- 400427600001
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
MSRP: $31.95Now: $29.00Was: $31.95 -
On Sale
ATHENA Top End Gasket Kit - Polaris P400427600002
ATHENA
MSRP: $48.95Now: $44.00Was: $48.95Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during midseason. Gives the rider a choice of using standard gas with stock compression, or race gas with a higher compression. Kits do not...400427600002- SKU:
- 400427600002
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
MSRP: $48.95Now: $44.00Was: $48.95 -
On Sale
ATHENA Top End Gasket Kit - Polaris P400427600004
ATHENA
MSRP: $47.95Now: $43.00Was: $47.95Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during midseason. Gives the rider a choice of using standard gas with stock compression, or race gas with a higher compression. Kits do not...400427600004- SKU:
- 400427600004
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
MSRP: $47.95Now: $43.00Was: $47.95 -
On Sale
ATHENA Top End Gasket Kit - Polaris P400427600006
ATHENA
MSRP: $92.95Now: $84.00Was: $92.95Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during midseason. Gives the rider a choice of using standard gas with stock compression, or race gas with a higher compression. Kits do not...400427600006- SKU:
- 400427600006
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
MSRP: $92.95Now: $84.00Was: $92.95 -
On Sale
ATHENA Complete Gasket Kit - Polaris P400427850004
ATHENA
MSRP: $54.95Now: $49.00Was: $54.95Superior-quality gasket sets from Athena, Head gaskets feature rubber-coated spring steel construction, Soft steel base gaskets are rubber coated, Steel core materials feature high springback and superior tensile strength, Revolutionary transparent...400427850004- SKU:
- 400427850004
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $54.95Now: $49.00Was: $54.95 -
Cylinder Works Big Bore Gasket Kit for Honda TRX450R 2004-2005 11003-G01
CYLINDER WORKS
$99.95If you're running a Honda TRX450R and want measurable gains in displacement and power without extensive machine work, this big bore kit delivers the displacement increase you need with minimal fabrication hassle. The Cylinder Works 11003-G01 pairs a...09341526- SKU:
- 09341526
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- BORE SIZE METRIC:
- OVERSIZED (+3.00 MM)
- TYPE:
- TOP END
- STYLE:
- BIG BORE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- MATERIAL:
- NICKEL SILICON CARBIDE
$99.95
