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 - .25mm - Kawasaki 54-256-11
WSM
$289.93A worn or damaged top end compromises your engine's compression, efficiency, and reliability—whether you're racing or putting miles on your machine. The WSM Top End Kit delivers OEM-quality...09031402- SKU:
- 09031402
- Availability:
- Ships Same Business Day
- Weight:
- 3.05 LBS
- UNITS:
- KIT
- OVERBORE METRIC:
- +0.25 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
$289.93 -
WSM Top End Kit - Standard - Polaris 54-311-10
WSM
$197.10A worn or damaged top end severely compromises engine efficiency, throttle response, and overall reliability. The WSM Top End Kit delivers OEM-quality components engineered to restore your Polaris...09031406- SKU:
- 09031406
- Availability:
- Ships Same Business Day
- Weight:
- 2.75 LBS
- PRODUCT NAME:
- PISTON KIT
- OVERBORE METRIC:
- STANDARD
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$197.10Qty in Cart: 0Quantity:Price:$197.10Subtotal: -
WSM Top End Kit - .25mm - Polaris 54-311-11
WSM
$197.10Engine wear happens. When your Polaris 4-stroke top end starts losing compression and power, a complete piston kit rebuild restores factory performance without the downtime of a full engine overhaul...09031407- SKU:
- 09031407
- Availability:
- Ships Same Business Day
- Weight:
- 2.75 LBS
- OVERBORE METRIC:
- +0.25 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$197.10Qty in Cart: 0Quantity:Price:$197.10Subtotal: -
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...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...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...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...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
$105.15Qty in Cart: 0Quantity:Price:$105.15Subtotal: -
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...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...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...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...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,...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...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...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...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...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...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...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...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...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
