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 2003 Piston Kit with Gaskets PK1582
WISECO
$264.95If you're rebuilding a 2003 Honda CR125R or planning an overbore, the Wiseco PK1582 Piston Kit delivers the durability and performance you need in one complete package. This forged high-silicon...09030733- SKU:
- 09030733
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- DISPLACEMENT:
- 134 CC
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 54.50 MM
- COOLING SYSTEM:
- AIR COOLED
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 56.00 MM
- MODEL:
- RACER'S CHOICE
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +2.00 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$264.95Qty in Cart: 0Quantity:Price:$264.95Subtotal: -
Wiseco Piston Kit for Suzuki DR-Z400 2000-2004 PK1659
WISECO
$309.95When you're rebuilding a high-revving 2-stroke engine, component quality directly impacts reliability and peak performance. The Wiseco Piston Kit for your DR-Z400 delivers forged-piston strength with...09030734- SKU:
- 09030734
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- FORGED SERIES
- RIDING STYLE:
- STREET
- SKIRT COATING:
- ARMORGLIDE®
- BORE SIZE METRIC:
- 90.00 MM
- COMPRESSION RATIO IMPERIAL:
- 12.2:1
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 62.60 MM
- DISPLACEMENT:
- 398 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 89.92 MM
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$309.95 -
Wiseco Piston Kit 90mm 13.5:1 for Suzuki DR-Z400 2000-2018 PK1661
WISECO
$294.95The Wiseco Piston Kit PK1661 delivers the strength and thermal stability your DR-Z400 demands when you're pushing peak RPMs and sustained high-load conditions. High-silicone forged construction...09030736- SKU:
- 09030736
- Availability:
- Ships Same Business Day
- Weight:
- 1.60 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- KIT
- BORE SIZE METRIC:
- 90.00 MM
- MODEL:
- FORGED SERIES
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 62.60 MM
- DISPLACEMENT:
- 398 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 89.92 MM
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- TYPE:
- TOP END
$294.95Qty in Cart: 0Quantity:Price:$294.95Subtotal: -
Wiseco Piston Kit 54.5mm 11:1 Compression Yamaha TTR125 2000-2021 PK1683
WISECO
$197.95If you're rebuilding your TTR125's top end, a quality piston kit is non-negotiable—it's the foundation of engine reliability and power output. The Wiseco PK1683 delivers forged-piston durability with...09030740- SKU:
- 09030740
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE SIZE METRIC:
- 54.50 MM
- DISPLACEMENT:
- 123.7 CC
- PISTON DIAMETER METRIC:
- 54.45 MM
- TYPE:
- TOP END
- BORE - OVERSIZE METRIC:
- +0.50 MM
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE:
- +0,50 MM
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.00 MM
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- REBUILD KIT
$197.95 -
Wiseco Piston Kit 55mm Bore Yamaha TT-R125 2000-2004 PK1684
WISECO
$189.95When your TT-R125's original pistons wear out, a quality rebuild kit is the difference between a restored engine and a costly failure. Wiseco's forged piston kit delivers the durability and thermal...09030741- SKU:
- 09030741
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 55.00 MM
- MODEL:
- FORGED SERIES
- STROKE LENGTH METRIC:
- 54.00 MM
- DISPLACEMENT:
- 123.7 CC
- PISTON DIAMETER METRIC:
- 54.95 MM
- PRODUCT NAME:
- REBUILD KIT
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- TYPE:
- TOP END
$189.95Qty in Cart: 0Quantity:Price:$189.95Subtotal: -
Wiseco Yamaha TTR125 2000-2021 Piston Kit with Gaskets PK1682
WISECO
$197.95If you're rebuilding your TTR125 top-end, a quality piston kit directly impacts engine reliability, power delivery, and longevity. Wiseco's high-silicone forged pistons are engineered to handle the...09030742- SKU:
- 09030742
- Availability:
- Ships Same Business Day
- Weight:
- 0.77 LBS
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 123.7 CC
- PRODUCT NAME:
- REBUILD KIT
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 53.95 MM
- STROKE LENGTH METRIC:
- 54.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$197.95 -
Wiseco Piston Kit Honda CRF250R 2004-2007 4829M07800
WISECO
$210.95The stock piston in your CRF250R is a compromise between cost and performance—it's time to upgrade. A quality aftermarket piston like this Wiseco kit will sharpen throttle response, reduce combustion...09100333- SKU:
- 09100333
- Availability:
- Ships Same Business Day
- Weight:
- 0.53 LBS
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.9:1
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- ARMORGLIDE®
- STROKE LENGTH METRIC:
- 52.20 MM
- DISPLACEMENT:
- 249 CC
- BORE SIZE METRIC:
- 78.00 MM
- PISTON MATERIAL:
- FORGED
$210.95 -
Wiseco Piston Kit Standard Bore 100mm 8.7:1 Compression Honda XR650L 1993-2020 4562M10000
WISECO
$248.95If you're running an XR650L that's seen serious miles or you're prepping for aggressive trail and off-road duty, a quality piston kit is essential to maintain compression, seal integrity, and...09100337- SKU:
- 09100337
- Availability:
- Ships Same Business Day
- Weight:
- 1.38 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON
- BORE SIZE METRIC:
- 100.00 MM
- DISPLACEMENT:
- 650 CC
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- COMPRESSION RATIO IMPERIAL:
- 8.7:1
- STROKE LENGTH METRIC:
- 82.00 MM
$248.95Qty in Cart: 0Quantity:Price:$248.95Subtotal: -
Wiseco Piston Kit for Kawasaki KX250 2005-2007 PK1379
WISECO
$285.95A worn or damaged piston directly limits your KX250's throttle response and peak power output. The Wiseco PK1379 kit restores—and exceeds—OEM performance with a high-silicone forged aluminum...09030519- SKU:
- 09030519
- Availability:
- Ships Same Business Day
- Weight:
- 1.42 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 66.40 MM
- DISPLACEMENT:
- 249.3 CC
- PISTON DIAMETER METRIC:
- 66.36 MM
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 72.00 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$285.95 -
Wiseco Piston Kit Honda CR250R 1997-2001 702M06850
WISECO
$224.95A worn or damaged piston directly compromises combustion efficiency, throttle response, and overall engine reliability—especially critical on a two-stroke like the CR250R where precision tolerances...09101232- SKU:
- 09101232
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- UNITS:
- EACH
- BORE SIZE METRIC:
- 68.50 MM
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- BORE - OVERSIZE:
- +2,10 MM
- BORE - OVERSIZE METRIC:
- +2.10 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 72.00 MM
$224.95Qty in Cart: 0Quantity:Price:$224.95Subtotal: -
Wiseco 450 EXC 2003-2007 Piston Kit PK1445
WISECO
$358.95Two-stroke engines demand precision components that can handle extreme combustion pressures and rapid thermal cycling. The Wiseco 450 EXC Piston Kit delivers the strength and dimensional stability...09030690- SKU:
- 09030690
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 72.00 MM
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 88.92 MM
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 448 CC
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- KIT
- BORE SIZE METRIC:
- 89.00 MM
- MODEL:
- FORGED SERIES
$358.95Qty in Cart: 0Quantity:Price:$358.95Subtotal: -
Wiseco Piston Kit Standard 66.40mm Honda CR250R 1997-2001 768M06640
WISECO
$199.95The Wiseco Piston Kit delivers the strength and precision required for consistent CR250R performance across 1997-2001 model years. Whether you're pushing lap times or maintaining your two-stroke's...09101236- SKU:
- 09101236
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE SIZE METRIC:
- 66.40 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$199.95Qty in Cart: 0Quantity:Price:$199.95Subtotal: -
Wiseco KX125 2001-2002 Piston Kit with Gaskets PK1502
WISECO
$219.95When you're rebuilding a KX125 top end, cutting corners on piston quality will cost you—either in lost performance or catastrophic engine failure. The Wiseco KX125 Piston Kit delivers the precision...09030697- SKU:
- 09030697
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE - OVERSIZE:
- STANDARD
- PISTON DIAMETER METRIC:
- 53.95 MM
- SKIRT COATING:
- NON-COATED
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$219.95Qty in Cart: 0Quantity:Price:$219.95Subtotal: -
Wiseco Piston Kit Kawasaki KX85 2001-2008 782M04950
WISECO
$143.95A worn or stock piston can limit your KX85's potential—costing you throttle response, reliability, and track performance. Wiseco's precision-engineered piston kit restores the efficiency your engine...09101238- SKU:
- 09101238
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE - OVERSIZE:
- +1,00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- STROKE LENGTH METRIC:
- 45.80 MM
- BORE SIZE METRIC:
- 49.50 MM
- DISPLACEMENT:
- 84,9 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$143.95 -
Wiseco Piston Kit 89mm Honda CR500R 1984-2001 871M08900
WISECO
$238.95The Wiseco 89mm piston kit is engineered for the demanding demands of CR500R racing and high-rpm recreational riding. This precision-machined piston maintains stock bore diameter while delivering the...09102022- SKU:
- 09102022
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 89.00 MM
- DISPLACEMENT:
- 472 CC
- STROKE LENGTH METRIC:
- 76.00 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- EACH
$238.95 -
Wiseco Suzuki RM125 2004-2007 Piston Kit with Gaskets PK1377
WISECO
$234.95The Wiseco Suzuki RM125 piston kit is engineered for riders who demand reliable top-end performance in competitive or high-mileage conditions. High-silicone forged aluminum construction delivers the...09030531- SKU:
- 09030531
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- PISTON DIAMETER METRIC:
- 53.95 MM
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- TYPE:
- TOP END
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
$234.95Qty in Cart: 0Quantity:Price:$234.95Subtotal: -
Wiseco 72mm Piston Kit for 2005-2007 KTM 300 EXC PK1409
WISECO
$297.95Your KTM 300 EXC's top-end demands precision engineering to handle the demands of 2-stroke racing and trail riding. The Wiseco 72mm Piston Kit delivers exactly that—a complete rebuild solution...09030534- SKU:
- 09030534
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- SKIRT COATING:
- ARMORGLIDE®
- BORE SIZE METRIC:
- 72.00 MM
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- DISPLACEMENT:
- 297 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 73.00 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 71.94 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$297.95 -
Wiseco Piston Kit Yamaha PW50 1981-2025 653M04200
WISECO
$116.95The Wiseco Piston Kit for your Yamaha PW50 delivers the precision engineering your engine needs to maintain consistent performance across 45+ years of production. Whether you're rebuilding after high...09102871- SKU:
- 09102871
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 42.00 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +2,00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 39.20 MM
- UNITS:
- EACH
- DISPLACEMENT:
- 54 CC
$116.95 -
Wiseco Piston Kit Standard Bore 64.5mm Yamaha RT180 1990-1998 772M06450
WISECO
$162.95If you're rebuilding or refreshing your RT180 engine, piston quality directly impacts compression, reliability, and throttle response. Wiseco's forged aluminum construction delivers the strength...09102875- SKU:
- 09102875
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- DISPLACEMENT:
- 176 CC
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 64.50 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
$162.95 -
Wiseco Yamaha RT180 1990-1998 Piston Kit 772M06550
WISECO
$154.95The Wiseco piston kit for your Yamaha RT180 directly addresses wear and performance loss in the combustion chamber. A worn or damaged piston compromises compression, throttle response, and fuel...09102877- SKU:
- 09102877
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 65.50 MM
- DISPLACEMENT:
- 182 CC
- STROKE LENGTH METRIC:
- 54.00 MM
- PISTON MATERIAL:
- FORGED
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal:
