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
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Wiseco Suzuki RM80 1991-2001 49.5mm Piston Kit with Gaskets PK1528
WISECO
$189.95If you're running a 1991-2001 Suzuki RM80 and want to restore lost compression or upgrade to fresh top-end internals, the Wiseco PK1528 is the standard choice for serious riders. This complete piston kit eliminates the guesswork of sourcing individual...09030710- SKU:
- 09030710
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- PISTON SIZE METRIC:
- +2.00 MM
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- +2,00 MM
- ENGINE TYPE:
- 2-STROKE
- STROKE LENGTH METRIC:
- 46.80 MM
- TYPE:
- TOP END
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 49.50 MM
- DISPLACEMENT:
- 82 CC
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 49.45 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
$189.95Qty in Cart: 0Quantity:Price:$189.95Subtotal: -
Wiseco Piston Kit Suzuki RM250 2003-2008 823M06750
WISECO
$118.95A worn or damaged piston directly limits your RM250's power output and throttle response. Wiseco's 823M06750 kit restores—or exceeds—OEM performance with precision-engineered internals and a complete ring/pin assembly, getting you back to competitive lap...09101251- SKU:
- 09101251
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE METRIC:
- +1.10 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE SIZE METRIC:
- 67.50 MM
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 2-STROKE
- BORE - OVERSIZE:
- +1,10 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 72.00 MM
$118.95Qty in Cart: 0Quantity:Price:$118.95Subtotal: -
Wiseco Piston Kit 45.00mm 2.00mm Oversize Kawasaki KX60 1983-2003 648M04500
WISECO
$134.95When your KX60's stock piston reaches its limit, a quality replacement isn't optional—it's essential for maintaining compression, ring seal, and reliability through the heat cycles of aggressive riding. The Wiseco 648M04500 Pro-Lite Piston Kit delivers...09100344- SKU:
- 09100344
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 60 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 45.00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 41.60 MM
$134.95Qty in Cart: 0Quantity:Price:$134.95Subtotal: -
Wiseco Piston Kit 54mm for Suzuki RM125 2004-2007 835M05400
WISECO
$144.95If you're running a 2004-2007 Suzuki RM125 and want to reclaim lost compression, boost throttle response, and extend engine life, a quality piston kit is non-negotiable. The Wiseco 835M05400 Pro-Lite delivers the precision bore diameter and forged...09100357- SKU:
- 09100357
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 125 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 54.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- STROKE LENGTH METRIC:
- 54.50 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
$144.95Qty in Cart: 0Quantity:Price:$144.95Subtotal: -
Wiseco KX250 1993-2001 Piston Kit 68.50mm PK1291
WISECO
$294.95If you're running a vintage KX250 and want measurable gains in top-end power and engine reliability, a quality piston kit is non-negotiable. The Wiseco PK1291 delivers precision-forged internals that handle sustained high RPM loads without compromise,...09030547- SKU:
- 09030547
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- BORE - OVERSIZE:
- +2,10 MM
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE METRIC:
- +2.10 MM
- PISTON DIAMETER METRIC:
- 68.45 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 68.50 MM
- PRODUCT NAME:
- REBUILD KIT
$294.95Qty in Cart: 0Quantity:Price:$294.95Subtotal: -
Wiseco Yamaha YZ250F 2001-2004 Piston Kit with Gaskets PK1241
WISECO
$294.95When your YZ250F's top end starts showing wear, a complete piston and gasket kit is the most reliable path to restoring full compression and power delivery. Wiseco's PK1241 gives you OEM-spec precision with forged aluminum construction that handles the...09030554- SKU:
- 09030554
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.7:1
- DISPLACEMENT:
- 249 CC
- PISTON DIAMETER METRIC:
- 76.95 MM
- PRODUCT NAME:
- REBUILD KIT
- BORE SIZE METRIC:
- 77.00 MM
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- STROKE LENGTH METRIC:
- 53.60 MM
- TYPE:
- TOP END
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
$294.95Qty in Cart: 0Quantity:Price:$294.95Subtotal: -
Wiseco Piston Kit 77mm 14.1:1 for 2004-2005 Kawasaki KX250F PK1239
WISECO
$339.95If you're rebuilding your 2004–2005 KX250F or pushing it to its limits in competition, piston wear or damage will kill your power delivery and throttle response. The Wiseco PK1239 restores full compression and horsepower with a forged-aluminum top end...09030556- SKU:
- 09030556
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- COMPRESSION RATIO IMPERIAL:
- 14.1:1
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 77.00 MM
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 53.60 MM
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- PRODUCT NAME:
- REBUILD KIT
- PISTON DIAMETER METRIC:
- 76.96 MM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$339.95Qty in Cart: 0Quantity:Price:$339.95Subtotal: -
Wiseco Piston Kit Kawasaki GPz1100 1981-1985 1.089L 0.050 WK1247
WISECO
$574.95Stock pistons wear quickly under sustained high RPM, losing compression and power output. The Wiseco WK1247 restores—and exceeds—factory performance with forged aluminum construction and precision CNC machining, delivering reliable horsepower and...WK1247- SKU:
- WK1247
- Availability:
- Ships Same Business Day
- Weight:
- 3.81 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- BORE - OVERSIZE:
- +0,50 MM
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 80.50 MM
- PISTON DIAMETER METRIC:
- 80.39 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- DISPLACEMENT:
- 1083 CC
- MODEL:
- FORGED SERIES
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$574.95Qty in Cart: 0Quantity:Price:$574.95Subtotal: -
Wossner Piston Kit KTM 250 SX-F 2016-2022 8923DB
WOSSNER
$224.00Whether you're prepping for race season or rebuilding after a hard season of riding, a quality piston kit is non-negotiable for 2-stroke performance. The Wössner 8923DB delivers the durability and precision your KTM 250 SX-F demands, with engineering...09106135- SKU:
- 09106135
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 78.01 MM
- COMPRESSION RATIO IMPERIAL:
- 14.4:1
- BORE - OVERSIZE:
- +0,01 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PREMIUM SERIES
- PISTON SIZE METRIC:
- 77.97 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$224.00Qty in Cart: 0Quantity:Price:$224.00Subtotal: -
Wossner Piston Kit Yamaha YZ450F 2018-2019 12.9:1 8949DA
WOSSNER
$204.00The stock piston in your YZ450F will eventually wear, lose compression, and cost you power when it matters most. Wossner's 12.9:1 piston kit restores—and exceeds—factory performance with German engineering and premium forged aluminum designed to handle...09106137- SKU:
- 09106137
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE - OVERSIZE:
- STANDARD
- PISTON SIZE METRIC:
- 96.96 MM
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 97.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.9:1
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PRO SERIES
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
$204.00Qty in Cart: 0Quantity:Price:$204.00Subtotal: -
PROX Piston Kit 01.4409.C
PROX
$189.95When piston wear compromises ring seal and compression, power output suffers and reliability becomes questionable. The PROX Piston Kit 01.4409.C restores OEM-spec performance with precision-engineered pistons that maintain exact clearances and thermal...09101467- SKU:
- 09101467
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE SIZE METRIC:
- 95.99 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- PISTON DIAMETER METRIC:
- 95.99 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON SIZE METRIC:
- STANDARD SIZE C
- UNITS:
- EACH
$189.95Qty in Cart: 0Quantity:Price:$189.95Subtotal: -
PROX Piston Kit 01.6604.A
PROX
$229.95A piston kit is one of the most critical components in your engine's combustion chamber—it directly impacts compression ratio, heat dissipation, and overall durability under sustained load. The PROX Piston Kit 01.6604.A delivers OEM-equivalent...09101523- SKU:
- 09101523
- Availability:
- Ships Same Business Day
- Weight:
- 1.18 LBS
- PISTON DIAMETER METRIC:
- 100.94 MM
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 100.94 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- EACH
- PISTON SIZE METRIC:
- STANDARD SIZE A
- PRODUCT NAME:
- PISTON KIT
$229.95Qty in Cart: 0Quantity:Price:$229.95Subtotal: -
PROX Piston Kit 01.3408.A
PROX
$189.95A worn or damaged piston directly compromises engine efficiency, compression, and reliability—making a quality replacement essential for maintaining peak performance. The PROX Piston Kit 01.3408.A delivers OEM-equivalent performance with precision...09101556- SKU:
- 09101556
- Availability:
- Ships Same Business Day
- Weight:
- 0.86 LBS
- BORE SIZE METRIC:
- 95.96 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- PISTON DIAMETER METRIC:
- 95.96 MM
- PISTON SIZE METRIC:
- STANDARD SIZE A
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
$189.95Qty in Cart: 0Quantity:Price:$189.95Subtotal: -
PROX Piston Kit 01.3408.B
PROX
$189.95When your engine's pistons show wear or damage, you're looking at a complete loss of compression, power, and reliability. The PROX Piston Kit 01.3408.B delivers OEM-equivalent performance with the precision manufacturing standards that keep high-demand...09101557- SKU:
- 09101557
- Availability:
- Ships Same Business Day
- Weight:
- 0.86 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- PISTON SIZE METRIC:
- STANDARD SIZE B
- BORE SIZE METRIC:
- 95.97 MM
- PISTON DIAMETER METRIC:
- 95.97 MM
- PRODUCT NAME:
- PISTON KIT
$189.95Qty in Cart: 0Quantity:Price:$189.95Subtotal: -
PROX Piston Kit 01.2409.B
PROX
$179.95A worn or damaged piston directly compromises combustion efficiency, power output, and engine longevity. The PROX Piston Kit 01.2409.B restores OEM performance standards with precision-engineered components manufactured to exacting tolerances, giving you...09101610- SKU:
- 09101610
- Availability:
- Ships Same Business Day
- Weight:
- 0.53 LBS
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 76.96 MM
- PISTON SIZE METRIC:
- STANDARD SIZE B
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 76.96 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
$179.95Qty in Cart: 0Quantity:Price:$179.95Subtotal: -
PROX Piston Kit 01.1339.A
PROX
$185.95When your engine's pistons show signs of wear or damage, you need a direct replacement that matches the precision of your original equipment—not a compromise. The PROX Piston Kit 01.1339.A delivers OEM-equivalent performance through Japanese...09101129- SKU:
- 09101129
- Availability:
- Ships Same Business Day
- Weight:
- 0.49 LBS
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 77.97 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- PISTON KIT
- PISTON SIZE METRIC:
- STANDARD SIZE A
- BORE SIZE METRIC:
- 77.97 MM
$185.95Qty in Cart: 0Quantity:Price:$185.95Subtotal: -
PROX Piston Kit 01.6343.A
PROX
$166.95Piston failure can sideline your engine and derail your season. The PROX Piston Kit 01.6343.A delivers OEM-matched reliability with precision engineering, ensuring consistent combustion pressures and thermal stability across extended high-RPM runs. When...09101163- SKU:
- 09101163
- Availability:
- Ships Same Business Day
- Weight:
- 0.67 LBS
- PISTON SIZE METRIC:
- STANDARD SIZE A
- RIDING STYLE:
- OFF-ROAD
- PISTON DIAMETER METRIC:
- 66.35 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- EACH
- BORE SIZE METRIC:
- 66.35 MM
$166.95 -
PROX Piston Kit 01.6324.C
PROX
$166.95A worn or damaged piston can compromise your engine's compression, efficiency, and reliability—especially under high-performance conditions. The PROX Piston Kit 01.6324.C delivers OEM-equivalent quality with precision manufacturing, ensuring consistent...09101165- SKU:
- 09101165
- Availability:
- Ships Same Business Day
- Weight:
- 0.66 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON SIZE METRIC:
- STANDARD SIZE C
- BORE SIZE METRIC:
- 66.36 MM
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- PISTON DIAMETER METRIC:
- 66.36 MM
- PRODUCT NAME:
- PISTON KIT
$166.95 -
PROX Piston Kit 01.6338.A
PROX
$232.95Pistons are the backbone of engine reliability, and a quality rebuild kit ensures your engine performs at its peak while maintaining OEM-level durability. The PROX Piston Kit 01.6338.A delivers precision-engineered components manufactured to exacting...09101167- SKU:
- 09101167
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE SIZE METRIC:
- 75.96 MM
- PISTON SIZE METRIC:
- STANDARD SIZE A
- RIDING STYLE:
- OFF-ROAD
- PISTON DIAMETER METRIC:
- 75.96 MM
- PRODUCT NAME:
- PISTON KIT
$232.95Qty in Cart: 0Quantity:Price:$232.95Subtotal: -
PROX Piston Kit 01.4325.C
PROX
$139.95When your engine is the heart of your machine, piston quality directly impacts reliability, longevity, and power delivery. The PROX Piston Kit 01.4325.C delivers OEM-equivalent performance with Japanese manufacturing precision, giving you the confidence...09100601- SKU:
- 09100601
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE SIZE METRIC:
- 66.36 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PISTON DIAMETER METRIC:
- 66.36 MM
- PISTON SIZE METRIC:
- STANDARD SIZE C
- PRODUCT NAME:
- PISTON KIT
$139.95Qty in Cart: 0Quantity:Price:$139.95Subtotal:
