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 - 1mm - Honda 54-229-14
WSM
$138.09A top-end rebuild is non-negotiable for maintaining peak combustion efficiency and horsepower delivery in your 4-stroke engine. The WSM Top End Kit supplies everything needed for a complete piston and gasket renewal, eliminating the guesswork and...09031360- SKU:
- 09031360
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- UNITS:
- KIT
- RIDING STYLE:
- ATV
- OVERBORE METRIC:
- +1.00 MM
- PRODUCT NAME:
- PISTON KIT
$138.09Qty in Cart: 0Quantity:Price:$138.09Subtotal: -
Wiseco Engine Rebuild Kit for 2001-2004 Honda TRX400EX PWR131A-870
WISECO
$844.95A complete engine rebuild demands precision components that won't compromise reliability when you need it most. This Wiseco kit delivers OEM-spec or better parts for the 400EX platform, eliminating the guesswork of sourcing individual components and...09031514- SKU:
- 09031514
- Availability:
- Ships Same Business Day
- Weight:
- 15.85 LBS
$844.95Qty in Cart: 0Quantity:Price:$844.95Subtotal: -
WSM Top End Kit - Standard - Honda 54-231-10
WSM
$191.47A worn or damaged top end compromises engine efficiency and reliability—this complete piston kit gives you the precision components needed to restore or upgrade your 4-stroke Honda's combustion chamber. The WSM Top End Kit includes everything required...09031366- SKU:
- 09031366
- Availability:
- Ships Same Business Day
- Weight:
- 2.00 LBS
- OVERBORE METRIC:
- STANDARD
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
$191.47Qty in Cart: 0Quantity:Price:$191.47Subtotal: -
WSM Top End Kit - 1mm - Honda 200 54-222-14
WSM
$88.95A worn or damaged top-end demands immediate attention—neglecting it risks catastrophic engine failure and sidelines your machine. The WSM Top End Kit delivers OEM-quality components engineered to restore full compression, seal integrity, and reliable...09031475- SKU:
- 09031475
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- OVERBORE METRIC:
- +1.00 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$88.95Qty in Cart: 0Quantity:Price:$88.95Subtotal: -
WSM Top End Kit - Standard - Honda 300 54-219-10
WSM
$129.51Engine wear compromises both reliability and power output, making a quality top-end rebuild essential for maintaining peak performance. The WSM Top End Kit delivers OEM-grade components in one complete package, eliminating the guesswork of sourcing...09031476- SKU:
- 09031476
- Availability:
- Ships Same Business Day
- Weight:
- 1.80 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- OVERBORE METRIC:
- STANDARD
$129.51Qty in Cart: 0Quantity:Price:$129.51Subtotal: -
WSM Top End Kit - .5mm - Honda 300 54-219-12
WSM
$135.31A worn or damaged top end can rob your Honda 300 of power, efficiency, and reliability. This comprehensive WSM top end kit delivers everything needed for a complete piston-to-head rebuild, restoring lost compression and combustion efficiency. Whether...09031477- SKU:
- 09031477
- Availability:
- Ships Same Business Day
- Weight:
- 1.85 LBS
- RIDING STYLE:
- ATV
- OVERBORE METRIC:
- +0.50 MM
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
$135.31Qty in Cart: 0Quantity:Price:$135.31Subtotal: -
WSM Top End Kit - Standard - Honda 420 54-231-20
WSM
$191.47A properly assembled top end is the foundation of reliable 4-stroke performance, and the WSM Top End Kit eliminates guesswork by delivering factory-quality components in one package. Whether you're rebuilding after high-mileage wear or refreshing your...09031479- SKU:
- 09031479
- Availability:
- Ships Same Business Day
- Weight:
- 2.15 LBS
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- OVERBORE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
$191.47 -
Wiseco Engine Kit for Yamaha Warrior 350 1987-2004 PWR137-830
WISECO
$754.95A worn-out or damaged YFM350 engine demands a complete, quality rebuild—not patchwork repairs that compromise reliability. The Wiseco Engine Kit delivers everything needed for a full top-end and bottom-end overhaul, using precision-engineered components...09031521- SKU:
- 09031521
- Availability:
- Ships Same Business Day
- Weight:
- 15.90 LBS
$754.95Qty in Cart: 0Quantity:Price:$754.95Subtotal: -
Wiseco Engine Rebuild Kit Yamaha YFM350 Warrior 1987-2004 PWR137-840
WISECO
$754.95Engine wear is inevitable, but premature failure isn't. The Wiseco PWR137-840 Engine Rebuild Kit delivers all the precision components you need to restore your YFM350 Warrior to factory performance specifications—without the guesswork of sourcing...09031523- SKU:
- 09031523
- Availability:
- Ships Same Business Day
- Weight:
- 15.25 LBS
$754.95Qty in Cart: 0Quantity:Price:$754.95Subtotal: -
Wiseco Engine Kit for Yamaha Grizzly 660 2002-2008 PWR148-100
WISECO
$1,044.95If you're facing worn piston rings, a scored cylinder, or metal fatigue in your Grizzly 660's engine, a complete rebuild is your path back to reliable performance. The Wiseco Engine Kit gives you OEM-quality components engineered to restore your ATV's...09031534- SKU:
- 09031534
- Availability:
- Ships Same Business Day
- Weight:
- 19.60 LBS
$1,044.95Qty in Cart: 0Quantity:Price:$1,044.95Subtotal: -
Wrench Rabbit Engine Rebuild Kit for Honda TRX400EX 1999-2004 WR101-195
WRENCH RABBIT
$711.95When your TRX400EX engine shows signs of wear—whether it's compression loss, bearing play, or seal degradation—a complete rebuild is the only path to restoring original performance and reliability. The Wrench Rabbit WR101-195 kit consolidates every...09031446- SKU:
- 09031446
- Availability:
- Ships Same Business Day
- Weight:
- 17.40 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- FEATURES:
- KIT CONTAINS +3 MM PISTON
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ATV
- MODEL:
- WRENCH RABBIT
- UNITS:
- KIT
$711.95Qty in Cart: 0Quantity:Price:$711.95Subtotal: -
WSM Top-End Rebuild Kit - .50 mm 54-520-12P
WSM
$236.67A complete top-end rebuild requires precision components that can handle sustained RPM and combustion pressures—and the WSM .50 mm kit delivers exactly that. Whether you're refreshing a worn engine or optimizing performance after extended track use, this...5452012- SKU:
- 5452012
- Availability:
- Ships Same Business Day
- Weight:
- 2.00 LBS
- PISTON MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 64.50 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- PISTON SIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$236.67Qty in Cart: 0Quantity:Price:$236.67Subtotal: -
WSM Top-End Rebuild Kit - 1 mm 54-520-14P
WSM
$248.50A top-end rebuild demands precision components that restore your engine to factory specifications—or exceed them. The WSM Top-End Rebuild Kit delivers OEM-quality pistons, rings, and gaskets in one complete package, eliminating the guesswork of sourcing...5452014- SKU:
- 5452014
- Availability:
- Ships Same Business Day
- Weight:
- 2.00 LBS
- BORE SIZE METRIC:
- 65.00 MM
- TYPE:
- TOP END
- PISTON MATERIAL:
- ALUMINUM
- PISTON SIZE METRIC:
- +1.00 MM
- RIDING STYLE:
- ATV
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
$248.50Qty in Cart: 0Quantity:Price:$248.50Subtotal: -
WSM Top-End Rebuild Kit - .50 mm 54-530-12P
WSM
$138.01A top-end rebuild is essential maintenance for any racing engine experiencing wear, lost compression, or performance degradation. The WSM Top-End Rebuild Kit delivers OEM-quality components in a single, complete package—eliminating the need to source...5453012- SKU:
- 5453012
- Availability:
- Ships Same Business Day
- Weight:
- 1.19 LBS
- PISTON SIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PISTON MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 66.50 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
$138.01Qty in Cart: 0Quantity:Price:$138.01Subtotal: -
WSM Top-End Rebuild Kit - 1 mm 54-530-14P
WSM
$144.91A top-end rebuild kit is essential when your engine shows signs of wear—loss of compression, increased blow-by, or declining performance. The WSM 54-530-14P delivers premium components engineered to restore or exceed original performance specifications,...5453014- SKU:
- 5453014
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- BORE SIZE METRIC:
- 67.00 MM
- PISTON SIZE METRIC:
- +1.00 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$144.91 -
WSM Top-End Rebuild Kit - Standard 54-310-10P
WSM
$155.52A worn top-end doesn't just cost you power—it costs you consistency and reliability on the track or street. The WSM Top-End Rebuild Kit gives you OEM-equivalent or better components in one complete package, eliminating the guesswork of sourcing pistons,...09031027- SKU:
- 09031027
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- BORE SIZE METRIC:
- 74.50 MM
- PISTON SIZE METRIC:
- STANDARD
$155.52Qty in Cart: 0Quantity:Price:$155.52Subtotal: -
WSM Top-End Rebuild Kit - .25 mm 54-310-11P
WSM
$163.30A complete top-end rebuild requires precision-engineered components that work in perfect harmony—and this WSM kit delivers exactly that. Whether you're refreshing a tired engine or preparing for race season, having all critical gaskets, rings, and...09031028- SKU:
- 09031028
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PISTON MATERIAL:
- ALUMINUM
- PISTON SIZE METRIC:
- +0.25 MM
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 74.75 MM
- PRODUCT NAME:
- REBUILD KIT
$163.30Qty in Cart: 0Quantity:Price:$163.30Subtotal: -
WSM Top End Kit - .5mm - Honda 54-218-12
WSM
$203.12When your top end is worn, you lose compression, power, and reliability—exactly what you can't afford on the track or trail. The WSM Top End Kit delivers a complete piston assembly solution with OEM-quality components engineered for 4-stroke engines that...09031328- SKU:
- 09031328
- Availability:
- Ships Same Business Day
- Weight:
- 2.10 LBS
- RIDING STYLE:
- ATV
- OVERBORE METRIC:
- +0.50 MM
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
$203.12Qty in Cart: 0Quantity:Price:$203.12Subtotal: -
WSM Top End Kit - .5mm - Honda 54-220-12
WSM
$181.04A top-end rebuild demands precision components that restore compression and reliability without compromise. The WSM Top End Kit delivers OEM-quality pistons and gaskets in one complete package, eliminating the guesswork of sourcing individual components...09031333- SKU:
- 09031333
- Availability:
- Ships Same Business Day
- Weight:
- 2.05 LBS
- RIDING STYLE:
- ATV
- PRODUCT NAME:
- PISTON KIT
- OVERBORE METRIC:
- +0.50 MM
- UNITS:
- KIT
$181.04Qty in Cart: 0Quantity:Price:$181.04Subtotal: -
WSM Top End Kit - 1mm - Honda 54-220-14
WSM
$181.04A complete top-end rebuild starts with the right piston kit, and the WSM Top End Kit delivers the precision engineering your 4-stroke engine demands. This comprehensive package eliminates the guesswork of sourcing individual components, ensuring perfect...09031335- SKU:
- 09031335
- Availability:
- Ships Same Business Day
- Weight:
- 1.80 LBS
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- OVERBORE METRIC:
- +1.00 MM
- PRODUCT NAME:
- PISTON KIT
$181.04Qty in Cart: 0Quantity:Price:$181.04Subtotal:
