Dirt Bike Piston and Ring Kits
Dirt Bike Piston & Ring Kits for Yamaha YZ85, WR250 & YZ250 at JJ Motorsports
Rebuild your dirt bike's top end for maximum power and reliability with premium piston and ring kits from JJ Motorsports, forged from high-strength aluminum for superior heat resistance, lightweight performance, and precise fit in motocross, enduro, and trail riding. Our selection includes complete kits with pistons, high-performance rings, wrist pins, circlips, top-end bearings, and gaskets designed for enhanced combustion efficiency, reduced blow-by, and longer engine life under high-RPM abuse. Compatible with popular models like Yamaha YZ85 (2002-2018), WR250, and YZ250, these Wiseco-engineered components feature CNC-machined crowns for optimal cam shape, ArmorGlide skirt coatings for low friction, and 4032 alloy construction for durability in dusty, aggressive conditions. Whether you're refreshing a youth 85cc 2-stroke or upgrading a 250cc big bore, these kits ensure crisp throttle response, better sealing, and race-ready power without the need for custom boring—perfect for DIY rebuilds or pro-level maintenance.
Shop trusted brands like Wiseco for race-proven quality. Explore related categories such as dirt bike engine for cylinders and valves or dirt bike air and fuel for carburetors and jets.
Top Dirt Bike Piston & Ring Kits
- Wiseco YZ85 2002-2018 Piston Kit with Gaskets PK1202 – 47.50mm forged aluminum piston kit for Yamaha YZ85 2-stroke; includes rings, wrist pin, circlips, bearing, and gaskets for enhanced combustion and throttle response.
- Wiseco 68.00mm Piston Kit with Gaskets Yamaha WR/YZ 250 PK1563 – Complete big bore kit for Yamaha WR250/YZ250; features forged piston, rings, wrist pin, circlips, and top-end gaskets for superior power and sealing.
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
-
Wiseco Honda CR125R 1992-1997 Piston Kit with Gaskets PK1164
WISECO
$238.95The stock piston on your CR125R is a compromise between cost and performance—this Wiseco kit eliminates that tradeoff. Whether you're chasing lap times at the track or pushing hard on the trails, a properly engineered piston kit directly translates to...09030295- SKU:
- 09030295
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 54.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- DISPLACEMENT:
- 125 CC
- MODEL:
- PRO-LITE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON DIAMETER METRIC:
- 53.95 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 54.50 MM
$238.95 -
Wiseco Piston Kit for Suzuki RM250 2003-2008 PK1211
WISECO
$282.95A 2-stroke engine rebuild demands precision components that can handle extreme combustion temperatures and deliver consistent power cycle after cycle. The Wiseco PK1211 is engineered specifically for Suzuki RM250 models (2003-2008), giving you the exact...09030296- SKU:
- 09030296
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- DISPLACEMENT:
- 249 CC
- PISTON DIAMETER METRIC:
- 66.34 MM
- PRODUCT NAME:
- REBUILD KIT
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- SKIRT COATING:
- ARMORGLIDE®
- BORE SIZE METRIC:
- 66.40 MM
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$282.95Qty in Cart: 0Quantity:Price:$282.95Subtotal: -
Wiseco Piston Kit 54mm for 2002 Yamaha YZ125 PK1191
WISECO
$224.95A worn or damaged piston directly kills your YZ125's power delivery and throttle response—and rebuilding with OEM parts leaves performance on the table. The Wiseco PK1191 gives you a complete, ready-to-install solution engineered specifically for your...09030297- SKU:
- 09030297
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 53.95 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- DISPLACEMENT:
- 125 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- BORE SIZE METRIC:
- 54.00 MM
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$224.95Qty in Cart: 0Quantity:Price:$224.95Subtotal: -
Wiseco Honda CR80R 1992-2002 Piston Kit with Gaskets PK1269
WISECO
$192.95If you're running a Honda CR80R and need reliable top-end performance, a quality piston kit is non-negotiable. The Wiseco PK1269 delivers the precision engineering and durability required for consistent power delivery, whether you're prepping for...09030298- SKU:
- 09030298
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 47.00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- DISPLACEMENT:
- 82.9 CC
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 46.95 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 47.80 MM
- UNITS:
- KIT
$192.95 -
Wiseco Suzuki RM125 2000-2003 Piston Kit with Gaskets PK1180
WISECO
$219.95When your Suzuki RM125 demands a complete top-end rebuild, you need a piston kit engineered for the demands of competitive 2-stroke racing. The Wiseco PK1180 delivers aerospace-grade durability and precision engineering to restore—or exceed—your engine's...09030300- SKU:
- 09030300
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 124.8 CC
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 53.95 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 54.50 MM
$219.95 -
Wiseco 54mm Piston Kit for 2001-2002 Honda CR125R PK1261
WISECO
$233.95When your CR125R's top-end is worn, combustion efficiency drops and horsepower bleeds away. The Wiseco PK1261 restores your engine to peak performance with a precision-engineered piston kit that handles the extreme temperatures and pressures of 2-stroke...09030301- SKU:
- 09030301
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 53.95 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 54.00 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 125 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
$233.95Qty in Cart: 0Quantity:Price:$233.95Subtotal: -
Wiseco Piston Kit with Gaskets for 2003-2007 Honda CR85R PK1214
WISECO
$181.95When a piston fails or wear becomes noticeable, engine performance drops significantly—and rebuilding with OEM parts often leaves performance on the table. The Wiseco PK1214 delivers a complete, precision-engineered solution for your 2003-2007 Honda...09030302- SKU:
- 09030302
- Availability:
- Ships Same Business Day
- Weight:
- 0.72 LBS
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 47.80 MM
- TYPE:
- TOP END
- UNITS:
- KIT
- BORE SIZE METRIC:
- 47.50 MM
- DISPLACEMENT:
- 84.7 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 47.45 MM
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
$181.95Qty in Cart: 0Quantity:Price:$181.95Subtotal: -
Wiseco Piston Kit with Gaskets for Suzuki RM85 2002-2023 PK1206
WISECO
$186.95If you're rebuilding the top end of your RM85, compromising on piston quality means sacrificing reliability and peak performance when you need it most. The Wiseco PK1206 delivers the precision engineering and durable construction that serious racers...09030303- SKU:
- 09030303
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE SIZE METRIC:
- 48.00 MM
- MODEL:
- PRO-LITE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- DISPLACEMENT:
- 84.7 CC
- PISTON DIAMETER METRIC:
- 47.95 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 46.80 MM
$186.95Qty in Cart: 0Quantity:Price:$186.95Subtotal: -
Wiseco Piston Standard Kawasaki KX 80 Big Wheel 1988-1997 539M04800
WISECO
$134.95When your KX80's piston shows signs of wear—loss of compression, increased blowby, or sluggish throttle response—you're losing power and risking catastrophic engine damage. The Wiseco 539M04800 restores full performance with OEM-equivalent fitment and...539M04800- SKU:
- 539M04800
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 48.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- DISPLACEMENT:
- 82 CC
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- STROKE LENGTH:
- 45,80 MM
- STROKE LENGTH METRIC:
- 45.80 MM
$134.95Qty in Cart: 0Quantity:Price:$134.95Subtotal: -
Wiseco Piston Standard Kawasaki KX 125 1986 540M05600
WISECO
$154.95When your KX 125 engine demands a rebuild, compromising on piston quality means risking power loss and premature wear. The Wiseco 540M05600 delivers the precision fit and lightweight strength that 2-stroke engines require to perform consistently at high...540M05600- SKU:
- 540M05600
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- DISPLACEMENT:
- 124 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 50,6 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 50.60 MM
- UNITS:
- EACH
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco Piston 49mm Oversize for Suzuki RM 80 1986-1987 542M04900
WISECO
$144.95If you're running a Suzuki RM80 and demand more power and reliability from your engine, a quality piston upgrade is non-negotiable. The Wiseco 542M04900 delivers the precision bore diameter and forged aluminum construction needed to safely handle...542M04900- SKU:
- 542M04900
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- +1,50 MM
- BORE SIZE METRIC:
- 49.00 MM
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 46.80 MM
- UNITS:
- EACH
- DISPLACEMENT:
- 82 CC
- STROKE LENGTH:
- 46,80 MM
- BORE - OVERSIZE METRIC:
- +1.50 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
$144.95 -
Wiseco Piston 2.00 mm Oversize Suzuki RM 80 1977-1981 542M04950
WISECO
$144.95When a 2-stroke RM 80 engine reaches its limits, a quality piston replacement is non-negotiable—and the Wiseco 542M04950 delivers the precision engineering your rebuild demands. This forged aluminum piston maintains exact bore tolerances while reducing...542M04950- SKU:
- 542M04950
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE - OVERSIZE:
- +2,00 MM
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 46.80 MM
- BORE SIZE METRIC:
- 49.50 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 46,80 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- DISPLACEMENT:
- 82 CC
$144.95 -
Wiseco Piston Kit 1.00 mm Oversize Yamaha YZ 250 1992-1998 560M06900
WISECO
$199.95If you're running a Yamaha YZ 250 and want measurable gains in power and reliability, a quality piston kit is non-negotiable. The Wiseco 560M06900 delivers the precision engineering and durability needed to handle competitive racing and aggressive trail...560M06900- SKU:
- 560M06900
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 69.00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- +1,00 MM
- STROKE LENGTH METRIC:
- 68.00 MM
- DISPLACEMENT:
- 246,8 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 68,00 MM
- UNITS:
- EACH
$199.95Qty in Cart: 0Quantity:Price:$199.95Subtotal: -
Wiseco Piston 1.00mm Oversize for 2005 Honda CR125R 564M05500
WISECO
$154.95When you're pushing a 2-stroke to its limits, a worn or damaged piston becomes your weakest link. The Wiseco 564M05500 restores lost compression and power by delivering precise OEM fitment with aerospace-grade durability—critical for both track days and...564M05500- SKU:
- 564M05500
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
- STROKE LENGTH:
- 54,50 MM
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 55.00 MM
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- PISTON KIT
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco Piston Standard Kawasaki KX125 1988-1989 566M05600
WISECO
$154.95If you're running a 1988–1989 Kawasaki KX125, piston wear directly impacts combustion efficiency, throttle response, and engine longevity. The Wiseco 566M05600 restores—or exceeds—OEM performance with a CNC-machined, high-silicon aluminum design built to...566M05600- SKU:
- 566M05600
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 50.60 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 56.00 MM
- DISPLACEMENT:
- 124 CC
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 50,6 MM
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco Piston Standard Suzuki RM 125 1985-1986 519M05400
WISECO
$154.95If you're pushing your RM 125 to the limit, factory pistons won't cut it. The Wiseco Performance Piston delivers the strength and thermal stability required for sustained high-RPM racing, while its advanced forging design extracts measurable gains in...511M05400- SKU:
- 511M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- +1,50 MM
- STROKE LENGTH METRIC:
- 54.00 MM
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 123 CC
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 54,00 MM
- BORE - OVERSIZE METRIC:
- +1.50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco Piston Kit 55.00mm Oversize for Suzuki RM125 1981-1984 511M05500
WISECO
$154.95When your RM125's factory piston reaches its limits, a quality oversize replacement is your path to restored compression, reliable power delivery, and extended engine life. The Wiseco 511M05500 delivers precision engineering in a complete kit—no hunting...511M05500- SKU:
- 511M05500
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 55.00 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 123 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 54,00 MM
- UNITS:
- EACH
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco Piston 50mm Overbore Honda CR125R 1998-2007 518M05450
WISECO
$154.95When you're pushing a 2-stroke to its limits, the piston is where combustion meets durability. A worn or poorly-fitted piston will bleed power, increase heat stress, and shorten your engine's lifespan. The Wiseco 518M05450 is engineered for serious...518M05450- SKU:
- 518M05450
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- UNITS:
- EACH
- BORE - OVERSIZE:
- +0,50 MM
- DISPLACEMENT:
- 124 CC
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.00 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH:
- 54,00 MM
- BORE SIZE METRIC:
- 54.50 MM
- PISTON MATERIAL:
- ALUMINUM
$154.95 -
Wiseco Piston Kit 56mm Bore Honda CR125R 2004-2007 841M05600
WISECO
$179.95If you're running a Honda CR125R 2-stroke, piston wear is inevitable—and it directly impacts throttle response, compression, and lap times. The Wiseco 518M05600 delivers OEM-spec bore precision with aerospace-grade forged aluminum that handles the...518M05600- SKU:
- 518M05600
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 54.00 MM
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- ALUMINUM
- STROKE LENGTH:
- 54,00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$179.95Qty in Cart: 0Quantity:Price:$179.95Subtotal: -
Wiseco Piston Standard Yamaha YZ80 1987 520M04800
WISECO
$141.95The Wiseco 520M04800 is a complete piston kit engineered for the Yamaha YZ80 to restore your engine's compression and combustion efficiency after high-hour use or a top-end rebuild. Whether you're prepping for race season or refreshing a worn motor, this...520M04800- SKU:
- 520M04800
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- DISPLACEMENT:
- 82 CC
- STROKE LENGTH METRIC:
- 45.60 MM
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 48.00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 45,60 MM
$141.95Qty in Cart: 0Quantity:Price:$141.95Subtotal:
