ATV/UTV Engine Rebuild Kits
ATV/UTV Engine Rebuild Kits at JJ Motorsports
Revive your ATV/UTV with complete engine rebuild kits from JJ Motorsports, featuring everything you need for a full top-to-bottom refresh on Yamaha Blaster, Polaris, Arctic Cat, Kawasaki, and Suzuki models. These all-in-one kits include pistons, gaskets, bearings, seals, and more for fast, reliable rebuilds and maximum performance.
Shop Wrench Rabbit and Wiseco rebuild kits for race-proven quality. Explore related categories such as ATV/UTV engine for individual components, or ATV/UTV for cams and exhaust to finish your build and ride with total confidence across all conditions, from high-speed dunes to technical trails.
Top ATV/UTV Engine Rebuild Kits
- Wrench Rabbit Engine Kit Arctic Cat/Kawasaki/Suzuki WR101-061 – Complete rebuild kit with Vertex piston, gaskets, bearings, and seals; fits multiple 400-450cc models.
- Wiseco Engine Kit Blaster 1988-2006 PWR105-665 – Full kit for Yamaha Blaster; forged piston, gaskets, crank bearings, and seals for legendary 2-stroke power.
- Wrench Rabbit Engine Kit Polaris WR00054 – Vertex-based complete kit for Polaris 500/570; includes piston, bearings, gaskets, and seals.
Browse our in-stock inventory below with same-day shipping and expert support. Free shipping on orders over $99! Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
-
WSM Top End Kit - .5mm - Polaris 54-311-12
WSM
$197.10A worn or damaged top end compromises ring seal, reduces compression, and kills power output. The WSM Top End Kit gives you factory-fresh performance with precision-manufactured components engineered to Polaris specifications. This complete rebuild...09031408- SKU:
- 09031408
- Availability:
- Ships Same Business Day
- Weight:
- 2.65 LBS
- OVERBORE METRIC:
- +0.50 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$197.10 -
WSM Top End Kit - .75mm - Polaris 54-311-13
WSM
$197.10A worn or damaged top end doesn't just cost you power—it compromises reliability when you need it most. The WSM Top End Kit delivers OEM-quality components engineered to restore your 4-stroke engine to peak performance, whether you're rebuilding after...09031409- SKU:
- 09031409
- Availability:
- Ships Same Business Day
- Weight:
- 2.75 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- OVERBORE METRIC:
- +0.75 MM
$197.10 -
WSM Top End Kit - Standard - Yamaha 54-536-10
WSM
$105.15A worn or damaged top end compromises engine efficiency, power output, and reliability. This WSM Top End Kit delivers OEM-quality components engineered to restore your engine to factory specifications—or serve as a foundation for further performance...09031411- SKU:
- 09031411
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- OVERBORE METRIC:
- STANDARD
$105.15 -
WSM Top End Kit - .25mm - Yamaha 54-536-11
WSM
$105.15A top-end rebuild is essential to restoring cylinder head performance and maintaining compression integrity in your 4-stroke engine. This complete WSM piston kit eliminates the guesswork of sourcing individual components—you get factory-matched pistons,...09031412- SKU:
- 09031412
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- PRODUCT NAME:
- PISTON KIT
- OVERBORE METRIC:
- +0.25 MM
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$105.15 -
WSM Top End Kit - .5mm - Yamaha 54-536-12
WSM
$105.15A top-end rebuild is critical to maintaining peak compression, ring seal, and combustion efficiency—especially in high-RPM applications where factory tolerances have worn beyond spec. The WSM Top End Kit eliminates the guesswork of sourcing individual...09031413- SKU:
- 09031413
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- OVERBORE METRIC:
- +0.50 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$105.15Qty in Cart: 0Quantity:Price:$105.15Subtotal: -
WSM Top End Kit - 1mm - Yamaha 54-536-14
WSM
$100.14A complete top-end rebuild requires precision components that work in harmony—and this WSM kit delivers exactly that. Whether you're recovering from bearing wear, restoring compression, or upgrading an aging engine, this all-in-one solution eliminates...09031415- SKU:
- 09031415
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- PRODUCT NAME:
- PISTON KIT
- OVERBORE METRIC:
- +1.00 MM
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$100.14Qty in Cart: 0Quantity:Price:$100.14Subtotal: -
WSM Top End Kit - Standard - Yamaha 54-540-10
WSM
$150.15A complete top-end rebuild requires precision components engineered to exact tolerances, and the WSM Top End Kit delivers everything you need in one package. Whether you're restoring a worn engine or preparing for competition, this kit eliminates the...09031416- SKU:
- 09031416
- Availability:
- Ships Same Business Day
- Weight:
- 2.00 LBS
- OVERBORE METRIC:
- STANDARD
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
$150.15 -
WSM Top End Kit - .5mm - Yamaha 54-540-12
WSM
$150.15A properly sized top end directly impacts ring seal, compression ratio, and combustion efficiency—all critical factors in extracting reliable power from your 4-stroke engine. WSM's .5mm oversized pistons are precision-cast to OEM specifications, ensuring...09031418- SKU:
- 09031418
- Availability:
- Ships Same Business Day
- Weight:
- 1.80 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- OVERBORE METRIC:
- +0.50 MM
$150.15 -
WSM Top End Kit - .75mm - Yamaha 54-540-13
WSM
$150.15A complete top-end rebuild requires precision components that work in concert—and compromising on any single element undermines the entire assembly. The WSM Top End Kit delivers OEM-quality pistons, rings, and gaskets in one package, eliminating the...09031419- SKU:
- 09031419
- Availability:
- Ships Same Business Day
- Weight:
- 1.95 LBS
- OVERBORE METRIC:
- +0.75 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$150.15 -
WSM Top End Kit - 1mm - Yamaha 54-540-14
WSM
$143.00A top-end rebuild demands precision components that restore your engine to factory specifications—or better. The WSM Top End Kit delivers OEM-quality pistons and supporting hardware in a single package, eliminating the guesswork of sourcing individual...09031420- SKU:
- 09031420
- Availability:
- Ships Same Business Day
- Weight:
- 1.90 LBS
- PRODUCT NAME:
- PISTON KIT
- OVERBORE METRIC:
- +1.00 MM
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$143.00Qty in Cart: 0Quantity:Price:$143.00Subtotal: -
WSM Top End Kit - .5mm - Yamaha 54-544-12
WSM
$206.49A worn or damaged top end compromises combustion efficiency, power output, and engine longevity. The WSM Top End Kit delivers OEM-quality components engineered for reliable performance in demanding conditions, whether you're rebuilding after hard use or...09031423- SKU:
- 09031423
- Availability:
- Ships Same Business Day
- Weight:
- 2.80 LBS
- RIDING STYLE:
- UTV
- OVERBORE METRIC:
- +0.50 MM
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
$206.49 -
WSM Top End Kit - 1mm - Yamaha 54-544-14
WSM
$206.49A worn top end compromises power delivery, fuel efficiency, and engine reliability—the WSM Top End Kit gives you factory-spec performance without the full engine rebuild cost. This complete piston assembly restores compression and ring seal, critical for...09031425- SKU:
- 09031425
- Availability:
- Ships Same Business Day
- Weight:
- 2.80 LBS
- RIDING STYLE:
- UTV
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- OVERBORE METRIC:
- +1.00 MM
$206.49Qty in Cart: 0Quantity:Price:$206.49Subtotal: -
WSM Top End Kit - Standard - Yamaha 54-546-10
WSM
$225.28When your 4-stroke engine demands a complete refresh, half-measures won't cut it. The WSM Top End Kit delivers everything you need for a proper rebuild in one package—eliminating the guesswork of sourcing individual components and ensuring full...09031426- SKU:
- 09031426
- Availability:
- Ships Same Business Day
- Weight:
- 2.65 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- OVERBORE METRIC:
- STANDARD
- RIDING STYLE:
- UTV
$225.28Qty in Cart: 0Quantity:Price:$225.28Subtotal: -
WSM Top End Kit - .25mm - Yamaha 54-546-11
WSM
$210.34A worn or damaged top end dramatically reduces engine efficiency, compression, and reliability—especially in high-performance applications. This complete WSM piston kit supplies everything needed for a full top-end rebuild on your 4-stroke, eliminating...09031427- SKU:
- 09031427
- Availability:
- Ships Same Business Day
- Weight:
- 2.65 LBS
- UNITS:
- KIT
- RIDING STYLE:
- UTV
- OVERBORE METRIC:
- +0.25 MM
- RIDING STYLE:
- ATV
- PRODUCT NAME:
- PISTON KIT
$210.34 -
WSM Top End Kit - .5mm - Yamaha 54-546-12
WSM
$210.34When your top end starts showing signs of wear—loss of compression, increased blow-by, or sluggish throttle response—a quality piston kit is the most cost-effective way to restore your engine's original performance. The WSM Top End Kit delivers...09031428- SKU:
- 09031428
- Availability:
- Ships Same Business Day
- Weight:
- 2.65 LBS
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- RIDING STYLE:
- UTV
- OVERBORE METRIC:
- +0.50 MM
- PRODUCT NAME:
- PISTON KIT
$210.34 -
WSM Top End Kit - Standard - Yamaha 54-546-20
WSM
$225.28A worn or damaged top end directly compromises combustion efficiency, power output, and engine longevity. The WSM Top End Kit delivers OEM-quality pistons and matched components engineered to restore or upgrade your 4-stroke engine's performance and...09031431- SKU:
- 09031431
- Availability:
- Ships Same Business Day
- Weight:
- 2.30 LBS
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- OVERBORE METRIC:
- STANDARD
$225.28 -
WSM Top End Kit - .25mm - Yamaha 54-546-21
WSM
$210.34A worn or damaged top end directly compromises your engine's compression, power delivery, and reliability—especially critical if you're pushing performance or clocking serious hours. The WSM Top End Kit gives you everything needed for a complete, quality...09031432- SKU:
- 09031432
- Availability:
- Ships Same Business Day
- Weight:
- 2.30 LBS
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- OVERBORE METRIC:
- +0.25 MM
- RIDING STYLE:
- ATV
$210.34 -
WSM Top End Kit - .5mm - Yamaha 54-546-22
WSM
$210.34A worn top end compromises compression, efficiency, and reliability—this complete WSM piston kit eliminates guesswork by delivering OEM-quality components engineered for Yamaha 4-stroke engines. Whether you're rebuilding after high-mileage wear or...09031433- SKU:
- 09031433
- Availability:
- Ships Same Business Day
- Weight:
- 2.35 LBS
- PRODUCT NAME:
- PISTON KIT
- OVERBORE METRIC:
- +0.50 MM
- UNITS:
- KIT
- RIDING STYLE:
- ATV
$210.34 -
WSM Top End Kit - 1mm - Kawasaki 54-250-14
WSM
$125.25A worn or damaged top end compromises engine efficiency, reliability, and power output across the entire RPM range. The WSM Top End Kit delivers factory-spec precision components engineered to restore your engine to original performance standards or...09031375- SKU:
- 09031375
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- OVERBORE METRIC:
- +1.00 MM
- PRODUCT NAME:
- PISTON KIT
$125.25Qty in Cart: 0Quantity:Price:$125.25Subtotal: -
WSM Top End Kit - Standard - Kawasaki 54-252-10
WSM
$134.15A worn or damaged top end directly impacts engine performance, reliability, and fuel efficiency. The WSM Top End Kit delivers OEM-quality components engineered for Kawasaki 4-stroke engines, eliminating guesswork and ensuring proper ring seal, piston...09031376- SKU:
- 09031376
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- OVERBORE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
$134.15Qty in Cart: 0Quantity:Price:$134.15Subtotal:
