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
-
VERTEX Piston Kit 23375A
VERTEX
$254.95Piston selection directly impacts your engine's reliability, power delivery, and longevity. The VERTEX Piston Kit 23375A delivers precision-engineered pistons with advanced metallurgy and coating...09102421- SKU:
- 09102421
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON DIAMETER METRIC:
- 71.94 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 300 CC
- STYLE:
- CAST REPLICA
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- CYLINDER DIAMETER METRIC:
- 72 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$254.95Qty in Cart: 0Quantity:Price:$254.95Subtotal: -
VERTEX Piston Kit 23375C
VERTEX
$254.95Whether you're rebuilding a high-mileage engine or stepping up to forged internals, the VERTEX Piston Kit 23375C delivers the precision and durability needed for reliable performance across the...09102422- SKU:
- 09102422
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- DISPLACEMENT:
- 300 CC
- PISTON DIAMETER METRIC:
- 71.96 MM
- CYLINDER DIAMETER METRIC:
- 72 MM
$254.95 -
VERTEX Piston Kit 22995B
VERTEX
$158.95Whether you're rebuilding a tired engine or upgrading to higher compression, the VERTEX Piston Kit 22995B delivers the durability and performance you need to run hard without compromise. VERTEX's...09102034- SKU:
- 09102034
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- PISTON DIAMETER METRIC:
- 53.93 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
$158.95Qty in Cart: 0Quantity:Price:$158.95Subtotal: -
Wiseco Piston Kit Yamaha XT500 1976-1981 4764M08700
WISECO
$239.95If you're running a classic Yamaha XT500, TT500, or SR500, factory pistons won't cut it if you're serious about reliability and power. The Wiseco 4764M08700 delivers a noticeable bump in combustion...09102923- SKU:
- 09102923
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 87.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- DISPLACEMENT:
- 499 CC
- BORE - OVERSIZE:
- STANDARD
- RIDING STYLE:
- STREET
- STROKE LENGTH METRIC:
- 84.00 MM
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$239.95 -
Wiseco 88mm 9:1 Piston Kit for Yamaha XT500 1976-1981 4764M08800
WISECO
$239.95If you're running a classic Yamaha single-cylinder and want to unlock better combustion efficiency without sacrificing reliability, the Wiseco 4764M08800 delivers the precision engineering that...09102924- SKU:
- 09102924
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- BORE SIZE METRIC:
- 88.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +1.00 MM
- RIDING STYLE:
- STREET
- STROKE LENGTH METRIC:
- 84.00 MM
- BORE - OVERSIZE:
- +1,00 MM
- DISPLACEMENT:
- 499 CC
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$239.95Qty in Cart: 0Quantity:Price:$239.95Subtotal: -
Wiseco Piston Kit Yamaha SR500 1978-1981 XT500 1976-1981 TT500 1977-1981 4783M09000
WISECO
$269.95A worn or compromised piston directly kills engine efficiency and reliability—the Wiseco 4783M09000 restores both with precision-engineered construction built to handle sustained high-RPM loads. If...09102927- SKU:
- 09102927
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- STROKE LENGTH METRIC:
- 84.00 MM
- BORE - OVERSIZE METRIC:
- +3.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- EACH
- BORE - OVERSIZE:
- +3,00 MM
- BORE SIZE METRIC:
- 90.00 MM
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- DISPLACEMENT:
- 499 CC
- RIDING STYLE:
- STREET
$269.95Qty in Cart: 0Quantity:Price:$269.95Subtotal: -
Wiseco Piston Kit Honda CRF450R 2017 4978M09600
WISECO
$232.95If you're running a Honda CRF450R and want to unlock serious power gains without compromising reliability, a quality piston kit is non-negotiable. Wiseco's 4978M09600 delivers the compression ratio...09102933- SKU:
- 09102933
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- DISPLACEMENT:
- 449 CC
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 96.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 62.10 MM
$232.95 -
Wiseco Piston Kit Kawasaki KX450F 2015 40125M09603
WISECO
$239.95The stock piston in your KX450F won't cut it if you're serious about race-day performance. Wiseco's 4980M09600 kit delivers a 12.5:1 compression ratio that translates to measurable gains in power and...09102935- SKU:
- 09102935
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- DISPLACEMENT:
- 449 CC
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 96.00 MM
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- ENGINE TYPE:
- 4-STROKE
- STROKE LENGTH METRIC:
- 62.10 MM
$239.95Qty in Cart: 0Quantity:Price:$239.95Subtotal: -
Wiseco Piston Kit Honda CRF250R 2004-2007 4984M08200
WISECO
$264.95Stock pistons in your CRF250R can't handle sustained performance demands, limiting your engine's potential on the track or trail. Wiseco's 4984M08200 kit delivers measurable gains in throttle...09102938- SKU:
- 09102938
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE METRIC:
- +4.00 MM
- BORE - OVERSIZE:
- +4,00 MM
- BORE SIZE METRIC:
- 82.00 MM
- DISPLACEMENT:
- 276 CC
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 52.20 MM
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$264.95Qty in Cart: 0Quantity:Price:$264.95Subtotal: -
Wiseco Piston Kit Honda XR650L 1993-2017 10.5:1 101mm Bore 4989M10100
WISECO
$248.95If you're running a Honda XR650L that's seen serious miles, piston wear directly impacts throttle response, compression, and overall reliability. The Wiseco 4989M10100 restores—and exceeds—factory...09102940- SKU:
- 09102940
- Availability:
- Ships Same Business Day
- Weight:
- 1.55 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- STROKE LENGTH METRIC:
- 82.00 MM
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- BORE SIZE METRIC:
- 101.00 MM
- DISPLACEMENT:
- 650 CC
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
$248.95 -
Wiseco Yamaha YZ490 1982-1983 Piston Kit 478M08800
WISECO
$234.95The Yamaha YZ490's original piston wasn't built for sustained high-RPM performance or aggressive riding conditions. The Wiseco 478M08800 replaces worn or damaged pistons with precision-engineered...478M08800- SKU:
- 478M08800
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- BORE - OVERSIZE:
- +1,00 MM
- DISPLACEMENT:
- 487 CC
- PISTON DIAMETER METRIC:
- 87.92 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +1.00 MM
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- BORE SIZE METRIC:
- 88.00 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 82.00 MM
$234.95Qty in Cart: 0Quantity:Price:$234.95Subtotal: -
Wiseco Piston Kit 90mm 12.2:1 Compression for Suzuki DR-Z400 2000-2004 4713M09000
WISECO
$238.95If you're running a Suzuki DR-Z400 and want measurable gains in power output without sacrificing engine longevity, a quality piston upgrade is one of the most direct paths to that goal. The Wiseco...4713M09000- SKU:
- 4713M09000
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE - OVERSIZE:
- STANDARD
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- DISPLACEMENT:
- 398 CC
- PISTON DIAMETER METRIC:
- 89.92 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 62.60 MM
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- RIDING STYLE:
- ATV
- SKIRT COATING:
- ARMORGLIDE®
- BORE SIZE METRIC:
- 90.00 MM
$238.95 -
Wiseco Piston Kit 90mm 13.5:1 Compression Arctic Cat DVX 400 2004-2008 Kawasaki KFX 400 2003-2006 Suzuki DR-Z 400 2000-2004 4714M09000
WISECO
$219.95If you're running a 400cc ATV and want measurable gains in power delivery without sacrificing reliability, a high-compression piston upgrade is one of the most effective modifications you can make...4714M09000- SKU:
- 4714M09000
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE SIZE METRIC:
- 90.00 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- MODEL:
- FORGED SERIES
- STROKE LENGTH METRIC:
- 62.60 MM
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 398 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 89.92 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
$219.95Qty in Cart: 0Quantity:Price:$219.95Subtotal: -
Wiseco Piston Yamaha YT175 1982-1983 471M06600
WISECO
$162.95If your Yamaha YT175 is showing signs of worn pistons—loss of compression, increased blowby, or sluggish throttle response—a quality replacement is essential to restore engine efficiency and prevent...471M06600- SKU:
- 471M06600
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 65.95 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 50.00 MM
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 66.00 MM
- DISPLACEMENT:
- 172 CC
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
$162.95 -
Wiseco 66.00mm Piston Kit for Honda CR250R 1981-1983 466M06600
WISECO
$199.95If you're running a CR250R that demands reliability under race conditions or high-RPM trail abuse, a worn piston directly kills performance and invites catastrophic failure. The Wiseco 466M06600...466M06600- SKU:
- 466M06600
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- PISTON DIAMETER METRIC:
- 65.95 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 72.00 MM
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 66.00 MM
- DISPLACEMENT:
- 246 CC
- MODEL:
- FORGED SERIES
$199.95 -
Wiseco Piston Kit 39.50mm for KTM 50 SX 2009-2022 874M03950
WISECO
$121.95The Wiseco 874M03950 Pro-Lite Piston Kit is engineered to maximize combustion efficiency and responsiveness in your KTM 50 SX, delivering the precision tolerances and lightweight construction that...09103963- SKU:
- 09103963
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- DISPLACEMENT:
- 49 CC
- BORE SIZE METRIC:
- 39.50 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 40.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- PISTON MATERIAL:
- FORGED
$121.95 -
Wiseco Piston Kit Kawasaki KX85 2014-2024 879M04850
WISECO
$132.95The Kawasaki KX85 demands a piston that can handle the demands of 2-stroke racing without compromise. Wiseco's 879M04850 delivers the precision tolerances and material durability needed to sustain...09103964- SKU:
- 09103964
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 85 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 48.50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- STROKE LENGTH METRIC:
- 45.80 MM
$132.95 -
Wiseco Piston Kit Kawasaki KX100 2014-2021 880M05250
WISECO
$138.95Your KX100's factory piston won't cut it if you're pushing harder on the track or trail. The Wiseco 880M05250 Pro-Lite delivers measurable gains in compression efficiency and engine durability...09103965- SKU:
- 09103965
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 52.50 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 99 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- STROKE LENGTH METRIC:
- 45.80 MM
$138.95 -
Wiseco Piston Kit Kawasaki KX450F 2013-2018 12.5:1 Compression 40082M09600
WISECO
$255.95If you're running a KX450F at the edge of its limits, a worn or stock piston limits your engine's potential for power and reliability. The Wiseco 40082M09600 delivers a 12.5:1 compression ratio that...09103172- SKU:
- 09103172
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- BORE - OVERSIZE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 62.10 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- BORE SIZE METRIC:
- 96.00 MM
- DISPLACEMENT:
- 449 CC
$255.95 -
Wiseco Piston Kit Racer Elite 96mm 14:1 Compression Honda TRX450R 2006-2009 RE817M09600
WISECO
$388.95If you're running a Honda TRX450R or TRX450ER, this piston kit delivers the compression ratio and durability you need to extract real power gains without compromising reliability. The 14:1...09105126- SKU:
- 09105126
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
- BORE SIZE METRIC:
- 96.00 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- RIDING STYLE:
- ATV
$388.95
