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 Piston Kit for Kawasaki KLX400R 2004 4795M09450
WISECO
$269.95When your KLX400R is ready to perform beyond stock limitations, the Wiseco 4795M09450 Pro-Lite Piston Kit delivers the precision engineering needed to safely increase compression and unlock...09100768- SKU:
- 09100768
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- BORE - OVERSIZE:
- +4,50 MM
- BORE - OVERSIZE METRIC:
- +4.50 MM
- BORE SIZE METRIC:
- 94.50 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 62.60 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- DISPLACEMENT:
- 440 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- ARMORGLIDE®
$269.95Qty in Cart: 0Quantity:Price:$269.95Subtotal: -
Wiseco Piston Kit 96mm 12:1 Compression Kawasaki KX450F 2006-2008 KLX450R 2008-2010 4900M09600
WISECO
$239.95Whether you're pushing your KX450F or KLX450R to the limit on the track or trail, the Wiseco 4900M09600 Pro-Lite Piston Kit delivers the compression ratio and durability needed to extract real power...09100769- SKU:
- 09100769
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
- BORE SIZE METRIC:
- 96.00 MM
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- DISPLACEMENT:
- 449 CC
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- STREET
- STROKE LENGTH METRIC:
- 62.10 MM
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- ARMORGLIDE®
$239.95Qty in Cart: 0Quantity:Price:$239.95Subtotal: -
Wiseco Piston Kit Standard 200 EXC 1998-2016 770M06400
WISECO
$174.95If you're pushing your KTM 200 EXC hard on the track or trail, piston wear is inevitable—and a worn piston robs you of compression, throttle response, and reliability when you need it most. The...09100773- SKU:
- 09100773
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- DISPLACEMENT:
- 193 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- STROKE LENGTH METRIC:
- 60.00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 64.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
$174.95Qty in Cart: 0Quantity:Price:$174.95Subtotal: -
Wiseco Piston Kit 95mm 11:1 Compression KTM 520 EXC 2000-2002 4731M09500
WISECO
$254.95If you're running a KTM 520 EXC and want measurable gains in power and throttle response, a high-compression piston kit is one of the most cost-effective upgrades available. The Wiseco 4731M09500...09100787- SKU:
- 09100787
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- DISPLACEMENT:
- 510 CC
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE SIZE METRIC:
- 95.00 MM
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- STREET
- PISTON MATERIAL:
- FORGED
$254.95 -
Wiseco Piston Kit 95mm 12.5:1 Compression KTM 520 EXC 2000-2002 4732M09500
WISECO
$284.95If you're running a KTM 520 EXC and want measurable gains in power and reliability, a quality piston kit is non-negotiable. The Wiseco 4732M09500 delivers the compression ratio and material...09100789- SKU:
- 09100789
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 95.00 MM
- BORE - OVERSIZE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- DISPLACEMENT:
- 510 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$284.95Qty in Cart: 0Quantity:Price:$284.95Subtotal: -
Wiseco 97mm Piston Kit for KTM 520 EXC 2000-2002 520 SX 2000-2002 525 EXC 2003-2006 525 SX 2003-2006 525 XC 2008-2010 Polaris Outlaw 525 IRS 2007-2010 4732M09700
WISECO
$284.95When you're pushing your KTM, Polaris, or Beta to the limit, a stock piston becomes your weakest link—especially under sustained high RPM or boost conditions. The Wiseco 4732M09700 Pro-Lite Piston...09100790- SKU:
- 09100790
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- DISPLACEMENT:
- 510 CC
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 97.00 MM
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
$284.95 -
Wiseco Piston Kit Standard 95.50mm 12:1 Compression Suzuki RM-Z450 2005-2007 4869M09550
WISECO
$239.95If you're running a 2005-2007 Suzuki RM-Z450 at the edge of its limits, a worn piston compromises both power delivery and engine longevity. The Wiseco 4869M09550 replaces that worn component with a...09100791- SKU:
- 09100791
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE SIZE METRIC:
- 95.50 MM
- DISPLACEMENT:
- 450 CC
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 62.80 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- MOLY COATED
$239.95Qty in Cart: 0Quantity:Price:$239.95Subtotal: -
Wiseco Piston Kit Standard 95.50mm 13:1 Compression Suzuki RM-Z450 2005-2007 4870M09550
WISECO
$269.95The Wiseco 4870M09550 Pro-Lite Piston Kit is engineered for RM-Z450 riders who need reliable performance under demanding conditions. A higher 13:1 compression ratio delivers measurable gains in...09100793- SKU:
- 09100793
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 62.80 MM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 95.50 MM
- DISPLACEMENT:
- 450 CC
- SKIRT COATING:
- MOLY COATED
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- 13.0:1
$269.95 -
Wiseco Piston Kit Yamaha YZ250F 2001-2004 4858M07700
WISECO
$264.95Stock pistons can't handle the demands of serious riding—thermal stress, detonation, and wear rob you of power and reliability. The Wiseco 4858M07700 Pro-Lite Piston Kit delivers the precision...09100806- SKU:
- 09100806
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- DISPLACEMENT:
- 263 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 53.60 MM
- BORE SIZE METRIC:
- 77.00 MM
- PISTON MATERIAL:
- FORGED
$264.95Qty in Cart: 0Quantity:Price:$264.95Subtotal: -
Wiseco Piston Kit Kawasaki KX250 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 617M06850
WISECO
$224.95When your KX250 2-stroke demands more power and reliability, the Wiseco 617M06850 Pro-Lite Piston Kit delivers the precision engineering needed to unlock peak performance. CNC-machined from...09101217- SKU:
- 09101217
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE SIZE METRIC:
- 68.50 MM
- PRODUCT NAME:
- PISTON
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +2.10 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +2,10 MM
- STROKE LENGTH METRIC:
- 72.00 MM
$224.95Qty in Cart: 0Quantity:Price:$224.95Subtotal: -
Wiseco Piston Kit Suzuki RM125 1989-1999 56.00 mm 641M05600
WISECO
$179.95A worn or damaged piston directly kills your RM125's power output and throttle response. The Wiseco 641M05600 Pro-Lite Kit restores peak compression and reliability, delivering the snap and...09101219- SKU:
- 09101219
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- BORE - OVERSIZE:
- +2,00 MM
- DISPLACEMENT:
- 123 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.00 MM
$179.95Qty in Cart: 0Quantity:Price:$179.95Subtotal: -
Wiseco Piston Kit Honda CR80R 1986-2002 49mm 643M04900
WISECO
$155.95If you're rebuilding a Honda CR80R engine or pushing your current one to its limits, the Wiseco 643M04900 Pro-Lite Piston Kit delivers the precision fit and lightweight construction needed for...09101221- SKU:
- 09101221
- Availability:
- Ships Same Business Day
- Weight:
- 0.33 LBS
- DISPLACEMENT:
- 82,9 CC
- UNITS:
- EACH
- BORE - OVERSIZE:
- +2,00 MM
- PISTON MATERIAL:
- ALUMINUM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- BORE SIZE METRIC:
- 49.00 MM
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 47.80 MM
$155.95 -
Wiseco Piston Kit with Gaskets 54mm Suzuki RM125 2004-2008 PK1410
WISECO
$264.95A worn-out top end kills power and reliability on the track or trail. The Wiseco PK1410 gives your RM125 a complete refresh with precision-engineered components that restore compression, throttle...09030685- SKU:
- 09030685
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- COOLING SYSTEM:
- AIR COOLED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE SIZE METRIC:
- 54.00 MM
- PISTON MATERIAL:
- ALUMINUM
- DISPLACEMENT:
- 125 CC
- MODEL:
- RACER'S CHOICE
- TYPE:
- TOP END
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- REBUILD KIT
$264.95Qty in Cart: 0Quantity:Price:$264.95Subtotal: -
Wiseco 45mm Piston Kit with Gaskets for 1999-2008 KTM 65 SX PK1514
WISECO
$191.95When your KTM 65 SX top end starts losing compression and power, a quality piston kit isn't optional—it's essential to restore competitive performance and prevent catastrophic engine damage. The...09030701- SKU:
- 09030701
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- DISPLACEMENT:
- 63.58 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- TYPE:
- TOP END
- PISTON DIAMETER METRIC:
- 44.95 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 45.00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 40.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
$191.95 -
Wiseco Piston Kit with Gaskets for Suzuki RM80 1991-2001 PK1521
WISECO
$192.95If you're running a classic Suzuki RM80 and want to extract genuine performance gains without guesswork, a quality top-end rebuild is non-negotiable. The Wiseco PK1521 delivers the precision...09030703- SKU:
- 09030703
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- TYPE:
- TOP END
- DISPLACEMENT:
- 82 CC
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 47.50 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- PISTON DIAMETER METRIC:
- 47.45 MM
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 46.80 MM
$192.95 -
Wiseco Piston Kit Yamaha YZ85 2002-2024 48.00mm 0.50mm Oversize 805M04800
WISECO
$119.95When your YZ85's factory piston reaches its limit, a quality oversize replacement is essential for restoring compression and power. The Wiseco 805M04800 delivers the precision engineering and...09101246- SKU:
- 09101246
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 48.00 MM
- DISPLACEMENT:
- 85 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 47.80 MM
- UNITS:
- EACH
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
$119.95Qty in Cart: 0Quantity:Price:$119.95Subtotal: -
Wiseco Piston Kit 49.00mm Suzuki RM85 2002-2020 806M04900
WISECO
$119.95The stock piston in your RM85 can only take so much abuse before wear compromises performance and reliability. Wiseco's 806M04900 delivers the durability and precision fit you need to maintain peak...09101249- SKU:
- 09101249
- Availability:
- Ships Same Business Day
- Weight:
- 0.33 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 49.00 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 46.80 MM
- UNITS:
- EACH
- DISPLACEMENT:
- 84.7 CC
- BORE - OVERSIZE:
- +1,00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
$119.95 -
Wiseco Piston Kit Honda CR85R 2003-2007 833M04850
WISECO
$119.95The Wiseco 833M04850 is a precision-engineered piston kit built for 2-stroke engines that demand consistent power delivery and reliability. If you're serious about maintaining peak performance in...09101253- SKU:
- 09101253
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE SIZE METRIC:
- 48.50 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 47.80 MM
- BORE - OVERSIZE:
- +1,00 MM
- DISPLACEMENT:
- 84,7 CC
- PISTON MATERIAL:
- FORGED
$119.95Qty in Cart: 0Quantity:Price:$119.95Subtotal: -
Wiseco Piston Kit Yamaha YZ125 2005-2021 846M05800
WISECO
$210.95The piston is the heart of your YZ125's engine—responsible for transferring combustion force into usable power. A worn or stock piston limits your bike's potential, reducing compression efficiency...09101255- SKU:
- 09101255
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- BORE - OVERSIZE METRIC:
- +4.00 MM
- BORE SIZE METRIC:
- 58.00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- ARMORGLIDE®
- DISPLACEMENT:
- 144 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- +4,00 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GP STYLE
- RIDING STYLE:
- OFF-ROAD
$210.95 -
Wiseco Piston Kit 90.5mm 1.5mm Oversize Honda CR500R 1984-2001 871M09050
WISECO
$255.95The Wiseco 871M09050 delivers the compression and durability required to extract maximum power from your CR500R while maintaining reliability through extended high-rpm operation. Built with...09102025- SKU:
- 09102025
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- ARMORGLIDE®
- STROKE LENGTH METRIC:
- 76.00 MM
- UNITS:
- EACH
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +1.50 MM
- BORE SIZE METRIC:
- 90.50 MM
- ENGINE TYPE:
- 2-STROKE
- BORE - OVERSIZE:
- +1,50 MM
- DISPLACEMENT:
- 508 CC
$255.95Qty in Cart: 0Quantity:Price:$255.95Subtotal:
