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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HOT RODS Crankshaft - Stroker 4186
HOT RODS
$364.95If you're serious about maximizing displacement and low-end torque in your four-stroke ATV, a stroker crankshaft is one of the most effective bolt-on upgrades available. The HOT RODS 4186 Stroker...09210429- SKU:
- 09210429
- Availability:
- Ships Same Business Day
- Weight:
- 9.45 LBS
- COLOR/FINISH:
- STEEL
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- RIDING STYLE:
- ATV
- STROKE LENGTH METRIC:
- 65.10 MM
- MODEL:
- 4-CYCLE
- STROKE LENGTH:
- 65,10 MM
- UNITS:
- ASSEMBLY
- DISPLACEMENT:
- 471 CC
- TYPE:
- STROKER
- FEATURES:
- HEAVY DUTY CRANKSHAFT
- MATERIAL:
- 4140 STEEL
$364.95Qty in Cart: 0Quantity:Price:$364.95Subtotal: -
Wiseco Piston Kit 81mm Bore 10.25:1 Compression for 1985-1986 Honda ATC350X PK1015
WISECO
$250.95If you're running a 1985-1986 Honda ATC350X, factory pistons are a limiting factor in reliability and peak performance—especially if you're pushing RPMs or operating in sustained high-temperature...09030317- SKU:
- 09030317
- Availability:
- Ships Same Business Day
- Weight:
- 2.05 LBS
- PISTON DIAMETER METRIC:
- 80.95 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 81.00 MM
- DISPLACEMENT:
- 350.4 CC
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 68.00 MM
- TYPE:
- TOP END
- COMPRESSION RATIO IMPERIAL:
- 10.25:1
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- RIDING STYLE:
- ATV
$250.95Qty in Cart: 0Quantity:Price:$250.95Subtotal: -
Wiseco Ring Set 81.50mm Honda ATC350X 1985-1986 3208XG
WISECO
$49.95When you're rebuilding or refreshing your Honda ATC350X engine, ring quality directly impacts compression, blow-by control, and overall reliability under load. The Wiseco 3208XG ring set delivers...3208XG- SKU:
- 3208XG
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ATV
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 81.50 MM
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
$49.95Qty in Cart: 0Quantity:Price:$49.95Subtotal: -
Wiseco Piston Kit 83.25mm for Polaris Sportsman 400 4x4 1994-2005 PK1107
WISECO
$239.95A top-end rebuild is the foundation of reliable engine performance, and this Wiseco Piston Kit delivers everything needed for a complete, dependable restoration. The high-silicone forged construction...09030459- SKU:
- 09030459
- Availability:
- Ships Same Business Day
- Weight:
- 1.80 LBS
- PISTON DIAMETER METRIC:
- 83.17 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- STROKE LENGTH METRIC:
- 70.00 MM
- TYPE:
- TOP END
- BORE - OVERSIZE METRIC:
- +0.25 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,25 MM
- DISPLACEMENT:
- 400 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- REBUILD KIT
- BORE SIZE METRIC:
- 83.25 MM
- MODEL:
- FORGED SERIES
$239.95Qty in Cart: 0Quantity:Price:$239.95Subtotal: -
Wiseco Piston Kit 69mm 8.9:1 Compression for 1998-2005 Arctic Cat 300 and 1999-2002 Suzuki LT-F300F 4673M06900
WISECO
$194.95When you're pushing your Arctic Cat 300 or Suzuki LT-F300F to the limit, your factory piston becomes a bottleneck. The Wiseco 4673M06900 delivers the durability and efficiency you need to run...4673M06900- SKU:
- 4673M06900
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- PISTON DIAMETER METRIC:
- 68.95 MM
- STROKE LENGTH METRIC:
- 76.00 MM
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 69.00 MM
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 8.9:1
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- DISPLACEMENT:
- 280 CC
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- SKIRT COATING:
- NON-COATED
$194.95Qty in Cart: 0Quantity:Price:$194.95Subtotal: -
DID Cam Chain 25H98
DID
$29.44A cam chain is critical to your engine's valve timing accuracy—any slack or wear translates directly to performance loss and potential catastrophic damage at high RPM. The DID Cam Chain 25H98...D25H98- SKU:
- D25H98
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- TYPE:
- CAM
- UNITS:
- EACH
- MODEL:
- ROLLER
- NUMBER OF LINKS:
- 98
- CHAIN SIZE:
- 25H
- PRODUCT NAME:
- CHAIN
- RIDING STYLE:
- ATV
$29.44 -
COMETIC Gasket Set - Polaris 400 C7265
COMETIC
$55.95A failed head gasket can sideline your Polaris 400 and cost you race time or trail days. COMETIC's EST gasket kit eliminates the guesswork with a complete top-end seal package engineered for...C7265- SKU:
- C7265
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- BORE SIZE METRIC:
- 85.00 MM
- TYPE:
- TOP END
- UNITS:
- KIT
$55.95 -
COMETIC Top End Gasket Set - Honda C7349
COMETIC
$70.95A failing head gasket compromises combustion sealing and power output—especially critical when running high-boost or naturally aspirated builds pushing serious cylinder pressures. The COMETIC C7349...C7023- SKU:
- C7023
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- THICKNESS METRIC:
- 0.31 MM
- BORE SIZE METRIC:
- 68.00 MM
- THICKNESS IMPERIAL:
- 0,012'
- TYPE:
- TOP END
- UNITS:
- KIT
$70.95 -
COMETIC Top End Gasket Set - Honda C7021
COMETIC
$44.95A failed head gasket means downtime and costly engine damage—prevent catastrophic failure with COMETIC's MLS (multi-layered steel) technology, engineered specifically for high-output 4-stroke engines...C7021- SKU:
- C7021
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE SIZE METRIC:
- 72.00 MM
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- THICKNESS METRIC:
- 0.31 MM
- THICKNESS IMPERIAL:
- 0,012'
- TYPE:
- TOP END
$44.95Qty in Cart: 0Quantity:Price:$44.95Subtotal: -
Wiseco Piston Kit 81.50 mm for 1990-1993 Polaris Trail Boss 350L 639M08150
WISECO
$199.95If you're pushing your Trail Boss 350L beyond stock limits, you need a piston that won't fail under increased boost and compression. The Wiseco +1.50 mm kit delivers forged strength and precision...639M08150- SKU:
- 639M08150
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 70.00 MM
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- ATV
- STROKE LENGTH:
- 70,00 MM
- UNITS:
- EACH
- BORE - OVERSIZE:
- +1,50 MM
- DISPLACEMENT:
- 352 CC
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE METRIC:
- +1.50 MM
- BORE SIZE METRIC:
- 81.50 MM
$199.95Qty in Cart: 0Quantity:Price:$199.95Subtotal: -
K&S TECHNOLOGIES Oil Seal Kit - Polaris 50-5001
K&S TECHNOLOGIES
$34.95Oil seals are critical wear items that prevent fluid leakage and contamination in your engine's rotating components—neglecting them leads to catastrophic failure. The K&S Technologies Oil Seal Kit...505001- SKU:
- 505001
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
- APPLICATION:
- ENGINE
- RIDING STYLE:
- ATV
- TYPE:
- OIL
- PRODUCT NAME:
- SEAL KIT
- UNITS:
- KIT
$34.95 -
Wiseco Piston Honda CRF450R 2002 4394M06550
WISECO
$174.95When your CRF450R's piston reaches the end of its service life, you need a direct replacement that matches OEM specifications without compromising performance. Wiseco's high-silicon alloy...4394M06550- SKU:
- 4394M06550
- Availability:
- Ships Same Business Day
- Weight:
- 0.62 LBS
- BORE - OVERSIZE:
- +0,50 MM
- COMPRESSION RATIO IMPERIAL:
- 10.25:1
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- DISPLACEMENT:
- 199 CC
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 60.00 MM
- BORE SIZE METRIC:
- 65.50 MM
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 65.45 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
$174.95Qty in Cart: 0Quantity:Price:$174.95Subtotal: -
Wiseco Piston Kit Standard Bore 66mm 10.25:1 Compression Suzuki LT-4WD QuadRunner 1987-1995 4382M06600
WISECO
$174.95A worn or damaged piston compromises combustion efficiency, throttle response, and overall engine reliability—especially critical for the Suzuki LT-4WD QuadRunner. The Wiseco 4382M06600 delivers the...4382M06600- SKU:
- 4382M06600
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BORE SIZE METRIC:
- 66.00 MM
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- RIDING STYLE:
- ATV
- STROKE LENGTH METRIC:
- 67.00 MM
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 229 CC
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- COMPRESSION RATIO IMPERIAL:
- 10.25:1
- PISTON DIAMETER METRIC:
- 65.95 MM
$174.95Qty in Cart: 0Quantity:Price:$174.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - Suzuki P400510850231
ATHENA
MSRP: $54.95Now: $47.00Was: $54.95A complete top-end rebuild demands gaskets that can withstand extreme combustion pressures and temperature swings without failure. The ATHENA Complete Gasket Kit delivers factory-quality sealing...400510850231- SKU:
- 400510850231
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
MSRP: $54.95Now: $47.00Was: $54.95 -
On Sale
ATHENA Top End Gasket Kit - Suzuki P400510600231
ATHENA
MSRP: $34.95Now: $31.00Was: $34.95Whether you're prepping for race day or executing a mid-season engine refresh, the ATHENA Top End Gasket Kit delivers the precision sealing your Suzuki engine demands. This kit gives you the...400510600231- SKU:
- 400510600231
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
MSRP: $34.95Now: $31.00Was: $34.95Qty in Cart: 0Quantity:Price:MSRP: $34.95Now: $31.00Was: $34.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - Yamaha P400485850203
ATHENA
MSRP: $58.95Now: $50.00Was: $58.95Engine gasket degradation under high heat and compression is inevitable—but premature failure doesn't have to be. The ATHENA Complete Gasket Kit delivers OEM-quality sealing across your entire...400485850203- SKU:
- 400485850203
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
MSRP: $58.95Now: $50.00Was: $58.95 -
On Sale
ATHENA Top End Gasket Kit - Yamaha P400485600205
ATHENA
MSRP: $29.95Now: $25.00Was: $29.95Whether you're prepping for race day or performing a midseason engine refresh, the ATHENA Top End Gasket Kit ensures a proper seal on your top-end components with precision-manufactured gaskets. This...400485600205- SKU:
- 400485600205
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
MSRP: $29.95Now: $25.00Was: $29.95 -
On Sale
ATHENA Complete Gasket Kit - Honda P400210850300
ATHENA
MSRP: $82.95Now: $71.00Was: $82.95When rebuilding or freshening your engine, gasket failure isn't an option—it compromises compression, invites oil leaks, and can cost you race wins or reliability. The ATHENA Complete Gasket Kit...400210850300- SKU:
- 400210850300
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
MSRP: $82.95Now: $71.00Was: $82.95Qty in Cart: 0Quantity:Price:MSRP: $82.95Now: $71.00Was: $82.95Subtotal: -
MOOSE RACING Oil Seal Set - Polaris 822191
MOOSE RACING
$25.03Engine seals are critical barriers against oil leakage and contamination—failure here means catastrophic engine damage and costly downtime. This complete MOOSE RACING Oil Seal Set gives you...09351105- SKU:
- 09351105
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- APPLICATION:
- ENGINE
- RIDING STYLE:
- ATV
- TYPE:
- OIL
- UNITS:
- KIT
- PRODUCT NAME:
- SEAL KIT
$25.03 -
On Sale
ATHENA Complete Gasket Kit - Suzuki P400510850047
ATHENA
MSRP: $156.95Now: $141.00Was: $156.95A complete top-end and full-engine rebuild demands gaskets that maintain a reliable seal under extreme temperatures and high combustion pressures. The ATHENA Complete Gasket Kit delivers the...09341966- SKU:
- 09341966
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- TYPE:
- COMPLETE
MSRP: $156.95Now: $141.00Was: $156.95Qty in Cart: 0Quantity:Price:MSRP: $156.95Now: $141.00Was: $156.95Subtotal:
