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 - .75mm - Suzuki/Kawasaki 400 54-254-13
WSM
$214.20A worn or damaged top end directly kills engine performance and reliability. The WSM Top End Kit delivers a complete, OEM-quality rebuild solution that restores compression, sealing, and power output...09031469- SKU:
- 09031469
- Availability:
- Ships Same Business Day
- Weight:
- 2.00 LBS
- PRODUCT NAME:
- PISTON KIT
- OVERBORE METRIC:
- +0.75 MM
- UNITS:
- KIT
- RIDING STYLE:
- ATV
$214.20 -
WSM Top End Kit - 1mm - Suzuki/Kawasaki 400 54-254-14
WSM
$214.20A worn or damaged top end doesn't just kill performance—it compromises reliability when you need it most. The WSM Top End Kit gives you everything required for a complete piston and gasket refresh on...09031470- SKU:
- 09031470
- Availability:
- Ships Same Business Day
- Weight:
- 1.95 LBS
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- OVERBORE METRIC:
- +1.00 MM
- RIDING STYLE:
- ATV
$214.20Qty in Cart: 0Quantity:Price:$214.20Subtotal: -
WSM Top End Kit - Standard - Honda 200 54-222-10
WSM
$93.40A worn or damaged top end compromises power delivery and fuel efficiency, cutting short your engine's service life. The WSM Top End Kit delivers OEM-quality components in a single package,...09031471- SKU:
- 09031471
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- PRODUCT NAME:
- PISTON KIT
- OVERBORE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$93.40Qty in Cart: 0Quantity:Price:$93.40Subtotal: -
WSM Top End Kit - .25mm - Honda 200 54-222-11
WSM
$93.40A worn or damaged top end directly impacts compression, power delivery, and engine reliability. The WSM Top End Kit gives you everything needed for a complete piston and gasket refresh, restoring...09031472- SKU:
- 09031472
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- PRODUCT NAME:
- PISTON KIT
- OVERBORE METRIC:
- +0.25 MM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$93.40Qty in Cart: 0Quantity:Price:$93.40Subtotal: -
WSM Top End Kit - .5mm - Honda 200 54-222-12
WSM
$93.40A worn or damaged top end directly compromises engine efficiency, compression, and reliability—especially under racing conditions where precision tolerances are critical. The WSM Top End Kit delivers...09031473- SKU:
- 09031473
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- OVERBORE METRIC:
- +0.50 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$93.40 -
WSM Top End Kit - .25mm - Honda 420 54-231-21
WSM
$191.47A top-end rebuild is one of the most critical maintenance intervals for any 4-stroke engine, and cutting corners with inferior components will cost you performance and reliability when it matters...09031480- SKU:
- 09031480
- Availability:
- Ships Same Business Day
- Weight:
- 2.10 LBS
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- OVERBORE METRIC:
- +0.25 MM
- RIDING STYLE:
- ATV
$191.47 -
WSM Top End Kit - .5mm - Honda 420 54-231-22
WSM
$182.35A worn or damaged top end directly compromises combustion efficiency, power output, and engine reliability—especially critical in high-performance 4-stroke applications where precision tolerances...09031481- SKU:
- 09031481
- Availability:
- Ships Same Business Day
- Weight:
- 2.15 LBS
- OVERBORE METRIC:
- +0.50 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$182.35Qty in Cart: 0Quantity:Price:$182.35Subtotal: -
PROX Engine Rebuild Kit 10.EK5806.A
PROX
$1,110.95A complete engine rebuild requires precision components that restore your engine to OEM specifications or better. The PROX Engine Rebuild Kit 10.EK5806.A delivers comprehensive gasket sets, seals,...09031687- SKU:
- 09031687
- Availability:
- Ships Same Business Day
- Weight:
- 25.51 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- UTV
- BORE SIZE METRIC:
- STANDARD
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$1,110.95 -
On Sale
PROX Engine Rebuild Kit 10.EK5806.B
PROX
MSRP: $1,099.95Now: $704.00Was: $1,099.95A complete engine rebuild requires precision-engineered components that restore your engine to OEM specifications or better. The PROX Engine Rebuild Kit 10.EK5806.B delivers the critical internal...09031688- SKU:
- 09031688
- Availability:
- Ships Same Business Day
- Weight:
- 25.56 LBS
- RIDING STYLE:
- UTV
- BORE SIZE METRIC:
- +0.01 MM
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- ATV
MSRP: $1,099.95Now: $704.00Was: $1,099.95 -
PROX Engine Rebuild Kit 10.EK5806.A1
PROX
$1,110.95A complete engine rebuild demands precision components that restore your engine to factory specifications—or better. The PROX Engine Rebuild Kit 10.EK5806.A1 delivers OEM-quality internal parts in...09031690- SKU:
- 09031690
- Availability:
- Ships Same Business Day
- Weight:
- 26.61 LBS
- BORE SIZE METRIC:
- STANDARD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- ATV
- TYPE:
- ENGINE
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
$1,110.95 -
PROX Engine Rebuild Kit 10.EK5805.A1
PROX
$1,099.95A complete engine rebuild requires precision components that restore your engine to OEM specifications while maintaining the durability your high-performance builds demand. The PROX Engine Rebuild...09031696- SKU:
- 09031696
- Availability:
- Ships Same Business Day
- Weight:
- 25.61 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- BORE SIZE METRIC:
- STANDARD
- RIDING STYLE:
- UTV
$1,099.95 -
On Sale
PROX Engine Rebuild Kit 10.EK5806.C
PROX
MSRP: $1,099.95Now: $704.00Was: $1,099.95A comprehensive engine rebuild kit is essential when you're restoring your engine to factory specifications or preparing it for high-performance duty. The PROX 10.EK5806.C delivers...09031689- SKU:
- 09031689
- Availability:
- Ships Same Business Day
- Weight:
- 25.56 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- UTV
- BORE SIZE METRIC:
- +0.02 MM
- RIDING STYLE:
- ATV
- UNITS:
- KIT
MSRP: $1,099.95Now: $704.00Was: $1,099.95 -
On Sale
PROX Engine Rebuild Kit 10.EK5805.B1
PROX
MSRP: $1,099.95Now: $704.00Was: $1,099.95An engine rebuild demands precision components that restore performance to factory specifications—or better. The PROX Engine Rebuild Kit 10.EK5805.B1 provides OEM-quality internal parts engineered to...09031697- SKU:
- 09031697
- Availability:
- Ships Same Business Day
- Weight:
- 24.41 LBS
- BORE SIZE METRIC:
- +0.01 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- UNITS:
- KIT
- RIDING STYLE:
- UTV
MSRP: $1,099.95Now: $704.00Was: $1,099.95 -
On Sale
PROX Engine Rebuild Kit 10.EK5805.C1
PROX
MSRP: $1,099.95Now: $704.00Was: $1,099.95A complete engine rebuild demands precision components that restore your engine to factory specifications or beyond. The PROX Engine Rebuild Kit 10.EK5805.C1 delivers OEM-quality pistons, rings,...09031698- SKU:
- 09031698
- Availability:
- Ships Same Business Day
- Weight:
- 25.86 LBS
- PRODUCT NAME:
- REBUILD KIT
- BORE SIZE METRIC:
- +0.02 MM
- UNITS:
- KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- UTV
MSRP: $1,099.95Now: $704.00Was: $1,099.95 -
Wiseco Engine Rebuild Kit 85mm 2005-2008 Honda TRX400EX Sportrax PWR131B-850
WISECO
$809.95When your Honda TRX400EX's engine starts showing signs of wear, a complete rebuild is your best path to restoring peak performance and reliability. The Wiseco PWR131B-850 kit eliminates the guesswork...09031610- SKU:
- 09031610
- Availability:
- Ships Same Business Day
- Weight:
- 16.40 LBS
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- TYPE:
- ENGINE
- BORE SIZE METRIC:
- 85.00 MM
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- RIDING STYLE:
- ATV
- BORE - OVERSIZE:
- STANDARD
- UNITS:
- KIT
$809.95Qty in Cart: 0Quantity:Price:$809.95Subtotal: -
Wiseco Engine Rebuild Kit Honda TRX400EX 2005-2008 PWR131B-880
WISECO
$797.88When your Honda TRX400EX reaches high mileage or shows signs of wear, a complete engine rebuild is the most cost-effective way to restore full performance and reliability. The Wiseco PWR131B-880 kit...09031611- SKU:
- 09031611
- Availability:
- Ships Same Business Day
- Weight:
- 16.40 LBS
- BORE - OVERSIZE METRIC:
- +3.00 MM
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- BORE SIZE METRIC:
- 88.00 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- BORE - OVERSIZE:
- +3,00 MM
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$797.88 -
Wiseco Engine Rebuild Kit Honda TRX400EX 1999-2004 PWR131A-860
WISECO
$821.95When your TRX400EX's engine shows signs of wear—loss of compression, increased blow-by, or metal fatigue—a full rebuild is the most cost-effective way to restore original performance and reliability...09031513- SKU:
- 09031513
- Availability:
- Ships Same Business Day
- Weight:
- 16.20 LBS
$821.95 -
Wiseco Engine Rebuild Kit Yamaha YFM350 Warrior 1987-2004 PWR137-835
WISECO
$766.95When your Yamaha YFM350 Warrior's engine shows wear, a piecemeal approach wastes time and money. The Wiseco Engine Rebuild Kit PWR137-835 delivers everything you need for a complete top and...09031522- SKU:
- 09031522
- Availability:
- Ships Same Business Day
- Weight:
- 15.10 LBS
$766.95Qty in Cart: 0Quantity:Price:$766.95Subtotal: -
Wrench Rabbit Engine Rebuild Kit for Honda TRX 350 FE 2000-2006 WR00007
WRENCH RABBIT
$895.95When engine wear compromises your TRX 350's reliability, a complete rebuild restores factory performance and extends service life. The Wrench Rabbit WR00007 kit supplies all critical internal...09031633- SKU:
- 09031633
- Availability:
- Ships Same Business Day
- Weight:
- 17.25 LBS
- RIDING STYLE:
- UTV
- TYPE:
- ENGINE
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- ATV
$895.95 -
Wrench Rabbit Complete Engine Rebuild Kit for 2017 Polaris RZR 900 WR00009
WRENCH RABBIT
$1,994.95When engine wear compromises performance and reliability, a complete rebuild kit addresses every critical component in one service. The Wrench Rabbit Engine Rebuild Kit for your 2017 Polaris RZR 900...09031635- SKU:
- 09031635
- Availability:
- Ships Same Business Day
- Weight:
- 25.00 LBS
- RIDING STYLE:
- UTV
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- UNITS:
- KIT
- RIDING STYLE:
- ATV
$1,994.95
