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Dirt Bike Piston and Ring Kits

Dirt Bike Piston and Ring Kits

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

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 Piston Kit Standard 41mm for Kawasaki KFX50 2003-2009 826M04100

    Wiseco Piston Kit Standard 41mm for Kawasaki KFX50 2003-2009 826M04100

    WISECO

    $121.95
    If you're running a KFX50 and want reliable power without compromise, the Wiseco 826M04100 Piston Kit delivers the precision engineering needed for consistent performance across racing and trail conditions. This complete kit eliminates guesswork—you get...
    09100339
    SKU:
    09100339
    Availability:
    Ships Same Business Day
    Weight:
    0.25 LBS
    BORE SIZE METRIC:
    41.00 MM
    PISTON MATERIAL:
    FORGED
    PRODUCT NAME:
    PISTON
    STROKE LENGTH METRIC:
    37.80 MM
    BORE - OVERSIZE:
    STANDARD
    BORE - OVERSIZE METRIC:
    STANDARD
    PISTON MATERIAL:
    ALUMINUM ALLOY
    UNITS:
    EACH
    DISPLACEMENT:
    49 CC
    ENGINE TYPE:
    2-STROKE
    RIDING STYLE:
    ATV
    RIDING STYLE:
    OFF-ROAD
    $121.95
    Qty in Cart: 0
    Quantity:
    Price:
    $121.95
    Subtotal:
  • Wiseco Piston Kit 41.50 mm Oversize for Kawasaki KFX 50 2003-2009 826M04150

    Wiseco Piston Kit 41.50 mm Oversize for Kawasaki KFX 50 2003-2009 826M04150

    WISECO

    $104.95
    When you're rebuilding a 2-stroke engine, piston quality directly impacts power delivery, engine longevity, and overall reliability. The Wiseco 826M04150 delivers precision-engineered performance with aerospace-grade materials designed to handle the...
    09100340
    SKU:
    09100340
    Availability:
    Ships Same Business Day
    Weight:
    0.30 LBS
    PISTON MATERIAL:
    ALUMINUM ALLOY
    RIDING STYLE:
    ATV
    UNITS:
    EACH
    BORE - OVERSIZE METRIC:
    +0.50 MM
    ENGINE TYPE:
    2-STROKE
    STROKE LENGTH METRIC:
    37.80 MM
    BORE - OVERSIZE:
    +0,50 MM
    DISPLACEMENT:
    49 CC
    PISTON MATERIAL:
    FORGED
    PRODUCT NAME:
    PISTON
    RIDING STYLE:
    OFF-ROAD
    BORE SIZE METRIC:
    41.50 MM
    Qty in Cart: 0
    Quantity:
    Price:
    $104.95
    Subtotal:
  • Wiseco Piston Kit 42.00 mm Oversize Kawasaki KFX50 2003-2009 Suzuki JR50 1978-2006 826M04200

    Wiseco Piston Kit 42.00 mm Oversize Kawasaki KFX50 2003-2009 Suzuki JR50 1978-2006 826M04200

    WISECO

    $104.95
    When you're pushing a 2-stroke engine to its limits, a worn or undersized piston compromises compression, throttle response, and reliability. The Wiseco 826M04200 restores lost performance and durability with precision engineering and aerospace-grade...
    09100341
    SKU:
    09100341
    Availability:
    Ships Same Business Day
    Weight:
    0.05 LBS
    DISPLACEMENT:
    49 CC
    ENGINE TYPE:
    2-STROKE
    RIDING STYLE:
    ATV
    RIDING STYLE:
    OFF-ROAD
    BORE - OVERSIZE METRIC:
    +1.00 MM
    PISTON MATERIAL:
    ALUMINUM ALLOY
    UNITS:
    EACH
    BORE SIZE METRIC:
    42.00 MM
    STROKE LENGTH METRIC:
    37.80 MM
    BORE - OVERSIZE:
    +1,00 MM
    PISTON MATERIAL:
    FORGED
    PRODUCT NAME:
    PISTON
    Qty in Cart: 0
    Quantity:
    Price:
    $104.95
    Subtotal:
  • Wiseco Piston Kit 43.00 mm Oversize for Kawasaki KFX 50 2003-2009 826M04300

    Wiseco Piston Kit 43.00 mm Oversize for Kawasaki KFX 50 2003-2009 826M04300

    WISECO

    $109.95
    When you're ready to push your KFX 50 past factory limits, a quality piston kit is non-negotiable. Wiseco's 826M04300 delivers the precision engineering and durability needed for serious ride time—whether you're racing competitively or upgrading your...
    09100343
    SKU:
    09100343
    Availability:
    Ships Same Business Day
    Weight:
    0.30 LBS
    BORE - OVERSIZE METRIC:
    +2.00 MM
    DISPLACEMENT:
    49 CC
    ENGINE TYPE:
    2-STROKE
    STROKE LENGTH METRIC:
    37.80 MM
    PISTON MATERIAL:
    ALUMINUM ALLOY
    RIDING STYLE:
    ATV
    UNITS:
    EACH
    BORE SIZE METRIC:
    43.00 MM
    PISTON MATERIAL:
    FORGED
    RIDING STYLE:
    OFF-ROAD
    BORE - OVERSIZE:
    +2,00 MM
    PRODUCT NAME:
    PISTON
    Qty in Cart: 0
    Quantity:
    Price:
    $109.95
    Subtotal:
  • Wiseco Piston Kit 54.50 mm Kawasaki KX100 1995-2013 Suzuki RM100 2003 651M05450

    Wiseco Piston Kit 54.50 mm Kawasaki KX100 1995-2013 Suzuki RM100 2003 651M05450

    WISECO

    $139.95
    When your 2-stroke engine is the difference between winning and second place, every component matters. The Wiseco 651M05450 Pro-Lite Piston Kit delivers the precision engineering and thermal durability your KX100 or RM100 demands, whether you're pushing...
    09100345
    SKU:
    09100345
    Availability:
    Ships Same Business Day
    Weight:
    0.45 LBS
    BORE SIZE METRIC:
    54.50 MM
    STROKE LENGTH METRIC:
    45.80 MM
    BORE - OVERSIZE METRIC:
    +2.00 MM
    ENGINE TYPE:
    2-STROKE
    BORE - OVERSIZE:
    +2,00 MM
    DISPLACEMENT:
    99 CC
    PISTON MATERIAL:
    FORGED
    PRODUCT NAME:
    PISTON
    RIDING STYLE:
    OFF-ROAD
    PISTON MATERIAL:
    ALUMINUM ALLOY
    UNITS:
    EACH
    $139.95
    Qty in Cart: 0
    Quantity:
    Price:
    $139.95
    Subtotal:
  • Wiseco Piston Kit Kawasaki KX125 2004-2008 56.00 mm 2.00 mm Oversize 834M05600

    Wiseco Piston Kit Kawasaki KX125 2004-2008 56.00 mm 2.00 mm Oversize 834M05600

    WISECO

    $174.95
    A worn or stock piston limits your KX125's potential—this Wiseco Pro-Lite kit restores compression, throttle response, and engine longevity with precision-engineered components built for 2-stroke demands. Whether you're chasing track times or pushing...
    09100347
    SKU:
    09100347
    Availability:
    Ships Same Business Day
    Weight:
    0.55 LBS
    STROKE LENGTH METRIC:
    54.50 MM
    BORE - OVERSIZE METRIC:
    +2.00 MM
    ENGINE TYPE:
    2-STROKE
    BORE - OVERSIZE:
    +2,00 MM
    BORE SIZE METRIC:
    56.00 MM
    PISTON MATERIAL:
    FORGED
    PRODUCT NAME:
    PISTON
    RIDING STYLE:
    OFF-ROAD
    DISPLACEMENT:
    133 CC
    PISTON MATERIAL:
    ALUMINUM ALLOY
    UNITS:
    EACH
    $174.95
    Qty in Cart: 0
    Quantity:
    Price:
    $174.95
    Subtotal:
  • Wiseco Piston Kit 77mm 13.1:1 Compression for 2004-2005 Kawasaki KX250F 2004-2006 Suzuki RM-Z250 4842M07700

    Wiseco Piston Kit 77mm 13.1:1 Compression for 2004-2005 Kawasaki KX250F 2004-2006 Suzuki RM-Z250 4842M07700

    WISECO

    $224.95
    If you're rebuilding a KX250F or RM-Z250 engine or pushing for higher output on the track, a quality piston kit is non-negotiable. The Wiseco 4842M07700 delivers the compression ratio and material quality needed to support increased horsepower and...
    09100354
    SKU:
    09100354
    Availability:
    Ships Same Business Day
    Weight:
    0.53 LBS
    BORE SIZE METRIC:
    77.00 MM
    DISPLACEMENT:
    250 CC
    PISTON MATERIAL:
    FORGED
    STROKE LENGTH METRIC:
    53.60 MM
    BORE - OVERSIZE:
    STANDARD
    BORE - OVERSIZE METRIC:
    STANDARD
    PRODUCT NAME:
    PISTON
    SKIRT COATING:
    ARMORGLIDE®
    ENGINE TYPE:
    4-STROKE
    PISTON MATERIAL:
    ALUMINUM ALLOY
    RIDING STYLE:
    OFF-ROAD
    UNITS:
    EACH
    Qty in Cart: 0
    Quantity:
    Price:
    $224.95
    Subtotal:
  • Wiseco Piston Kit 77.00mm 14.1:1 Compression Kawasaki KX250F 2004-2005 Suzuki RM-Z250 2004-2006 4843M07700

    Wiseco Piston Kit 77.00mm 14.1:1 Compression Kawasaki KX250F 2004-2005 Suzuki RM-Z250 2004-2006 4843M07700

    WISECO

    $264.95
    If you're running a KX250F or RM-Z250 and want measurable gains in peak power and mid-range response, a high-compression piston kit is one of the most direct bolt-on upgrades available. The Wiseco 4843M07700 delivers a 14.1:1 compression ratio with...
    09100356
    SKU:
    09100356
    Availability:
    Ships Same Business Day
    Weight:
    0.15 LBS
    BORE - OVERSIZE METRIC:
    STANDARD
    PISTON MATERIAL:
    FORGED
    PRODUCT NAME:
    PISTON
    BORE - OVERSIZE:
    STANDARD
    BORE SIZE METRIC:
    77.00 MM
    DISPLACEMENT:
    250 CC
    ENGINE TYPE:
    4-STROKE
    PISTON MATERIAL:
    ALUMINUM ALLOY
    STROKE LENGTH METRIC:
    53.60 MM
    UNITS:
    EACH
    RIDING STYLE:
    OFF-ROAD
    $264.95
    Qty in Cart: 0
    Quantity:
    Price:
    $264.95
    Subtotal:
  • Wiseco RM125 2004-2007 Piston Kit 2.00mm Oversize 835M05600

    Wiseco RM125 2004-2007 Piston Kit 2.00mm Oversize 835M05600

    WISECO

    $177.95
    If you're running a 2004-2007 Suzuki RM125 and need to restore lost compression or step up displacement for more mid-range power, a quality piston kit is non-negotiable. The Wiseco 835M05600 delivers the precision engineering and durability you expect...
    09100358
    SKU:
    09100358
    Availability:
    Ships Same Business Day
    Weight:
    0.45 LBS
    BORE - OVERSIZE:
    +2,00 MM
    BORE SIZE METRIC:
    56.00 MM
    PRODUCT NAME:
    PISTON
    PISTON MATERIAL:
    FORGED
    RIDING STYLE:
    OFF-ROAD
    STROKE LENGTH METRIC:
    54.50 MM
    ENGINE TYPE:
    2-STROKE
    MODEL:
    PRO-LITE
    PISTON MATERIAL:
    ALUMINUM ALLOY
    UNITS:
    EACH
    BORE - OVERSIZE METRIC:
    +2.00 MM
    DISPLACEMENT:
    134 CC
    Qty in Cart: 0
    Quantity:
    Price:
    $177.95
    Subtotal:
  • Wiseco Piston Kit 58mm 11:1 Compression for 2003-2006 Kawasaki KLX125 4815M05800

    Wiseco Piston Kit 58mm 11:1 Compression for 2003-2006 Kawasaki KLX125 4815M05800

    WISECO

    $154.95
    If you're running a KLX125 and want measurable gains in acceleration and reliability, an 11:1 compression piston kit is one of the most effective upgrades available. The Wiseco 4815M05800 delivers forged aluminum construction that handles the stress of...
    09100361
    SKU:
    09100361
    Availability:
    Ships Same Business Day
    Weight:
    0.55 LBS
    BORE - OVERSIZE METRIC:
    +1.00 MM
    RIDING STYLE:
    OFF-ROAD
    ENGINE TYPE:
    4-STROKE
    PISTON MATERIAL:
    ALUMINUM ALLOY
    STROKE LENGTH METRIC:
    48.80 MM
    UNITS:
    EACH
    COMPRESSION RATIO IMPERIAL:
    11.0:1
    BORE - OVERSIZE:
    +1,00 MM
    BORE SIZE METRIC:
    58.00 MM
    DISPLACEMENT:
    125 CC
    PISTON MATERIAL:
    FORGED
    PRODUCT NAME:
    PISTON
    Qty in Cart: 0
    Quantity:
    Price:
    $154.95
    Subtotal:
  • Wiseco Piston Kit 46.50mm for Kawasaki KX65 2000-2020 and Suzuki RM65 2003-2005 PK1179

    Wiseco Piston Kit 46.50mm for Kawasaki KX65 2000-2020 and Suzuki RM65 2003-2005 PK1179

    WISECO

    $186.95
    Top-end wear is inevitable on high-performance 2-stroke machines, but a worn piston kit kills compression, power delivery, and reliability when you need it most. The Wiseco PK1179 restores your KX65 or RM65 to factory specifications with aerospace-grade...
    09030514
    SKU:
    09030514
    Availability:
    Ships Same Business Day
    Weight:
    0.75 LBS
    BORE - OVERSIZE:
    +2,00 MM
    BORE SIZE METRIC:
    46.50 MM
    PISTON SIZE METRIC:
    +2.00 MM
    PRODUCT NAME:
    REBUILD KIT
    PISTON MATERIAL:
    4032 ALUMINUM ALLOY
    RIDING STYLE:
    OFF-ROAD
    STROKE LENGTH METRIC:
    41.60 MM
    UNITS:
    KIT
    BORE - OVERSIZE METRIC:
    +2.00 MM
    DISPLACEMENT:
    64 CC
    ENGINE TYPE:
    2-STROKE
    MODEL:
    PRO-LITE
    PISTON DIAMETER METRIC:
    46.45 MM
    TYPE:
    TOP END
    SKIRT COATING:
    NON-COATED
    Qty in Cart: 0
    Quantity:
    Price:
    $186.95
    Subtotal:
  • Wiseco Piston Kit 54.50mm for Kawasaki KX100 1998-2013 PK1156

    Wiseco Piston Kit 54.50mm for Kawasaki KX100 1998-2013 PK1156

    WISECO

    $220.95
    If you're running a Kawasaki KX100 and want reliable top-end performance that actually delivers, a quality piston kit isn't optional—it's essential. The Wiseco PK1156 gives you forged pistons engineered for the thermal demands of competitive riding, with...
    09030515
    SKU:
    09030515
    Availability:
    Ships Same Business Day
    Weight:
    0.75 LBS
    DISPLACEMENT:
    99 CC
    PISTON SIZE METRIC:
    +2.00 MM
    PRODUCT NAME:
    REBUILD KIT
    BORE - OVERSIZE:
    +2,00 MM
    BORE - OVERSIZE METRIC:
    +2.00 MM
    ENGINE TYPE:
    2-STROKE
    MODEL:
    PRO-LITE
    PISTON DIAMETER METRIC:
    54.45 MM
    TYPE:
    TOP END
    PISTON MATERIAL:
    4032 ALUMINUM ALLOY
    RIDING STYLE:
    OFF-ROAD
    STROKE LENGTH METRIC:
    45.80 MM
    BORE SIZE METRIC:
    54.50 MM
    SKIRT COATING:
    NON-COATED
    UNITS:
    KIT
    $220.95
    Qty in Cart: 0
    Quantity:
    Price:
    $220.95
    Subtotal:
  • Wiseco Piston Kit 97mm 13.5:1 Compression for 2007-2012 KTM 450 SX-F 4938M09700

    Wiseco Piston Kit 97mm 13.5:1 Compression for 2007-2012 KTM 450 SX-F 4938M09700

    WISECO

    $284.95
    If you're running a KTM 450 SX-F or XC-F and want measurable gains in power and throttle response, a quality piston kit is one of the highest-impact upgrades you can make. The Wiseco 4938M09700 delivers a 13.5:1 compression ratio that extracts real...
    09100851
    SKU:
    09100851
    Availability:
    Ships Same Business Day
    Weight:
    0.90 LBS
    RIDING STYLE:
    OFF-ROAD
    STROKE LENGTH METRIC:
    60.80 MM
    DISPLACEMENT:
    449 CC
    BORE - OVERSIZE:
    STANDARD
    ENGINE TYPE:
    4-STROKE
    PISTON MATERIAL:
    ALUMINUM ALLOY
    RIDING STYLE:
    ATV
    UNITS:
    EACH
    BORE - OVERSIZE METRIC:
    STANDARD
    BORE SIZE METRIC:
    97.00 MM
    COMPRESSION RATIO IMPERIAL:
    13.5:1
    PISTON MATERIAL:
    FORGED
    PRODUCT NAME:
    PISTON
    SKIRT COATING:
    MOLY COATED
    $284.95
    Qty in Cart: 0
    Quantity:
    Price:
    $284.95
    Subtotal:
  • Wiseco Suzuki RM85 2002-2023 48.50mm Piston Kit PK1207

    Wiseco Suzuki RM85 2002-2023 48.50mm Piston Kit PK1207

    WISECO

    $186.95
    A properly rebuilt top end is non-negotiable for RM85 reliability and performance. The Wiseco PK1207 delivers the precision-engineered pistons and complete gasket set you need to restore compression, recover lost power, and extend engine life through...
    09030544
    SKU:
    09030544
    Availability:
    Ships Same Business Day
    Weight:
    0.75 LBS
    BORE - OVERSIZE:
    +0,50 MM
    BORE - OVERSIZE METRIC:
    +0.50 MM
    BORE SIZE METRIC:
    48.50 MM
    ENGINE TYPE:
    2-STROKE
    MODEL:
    PRO-LITE
    PISTON MATERIAL:
    4032 ALUMINUM ALLOY
    RIDING STYLE:
    OFF-ROAD
    TYPE:
    TOP END
    UNITS:
    KIT
    STROKE LENGTH METRIC:
    46.80 MM
    DISPLACEMENT:
    84.7 CC
    PRODUCT NAME:
    REBUILD KIT
    PISTON DIAMETER METRIC:
    48.45 MM
    SKIRT COATING:
    ARMORGLIDE®
    Qty in Cart: 0
    Quantity:
    Price:
    $186.95
    Subtotal:
  • Wiseco Piston Kit for Honda CR250R 2005-2007 66.40mm PK1381

    Wiseco Piston Kit for Honda CR250R 2005-2007 66.40mm PK1381

    WISECO

    $309.95
    The Wiseco PK1381 is engineered for CR250R riders who need a proven top-end rebuild that restores or exceeds factory performance. If you're experiencing power loss, worn compression, or simply demand race-proven components, this complete piston kit...
    09030550
    SKU:
    09030550
    Availability:
    Ships Same Business Day
    Weight:
    1.44 LBS
    COOLING SYSTEM:
    LIQUID COOLED
    DISPLACEMENT:
    249 CC
    BORE - OVERSIZE:
    STANDARD
    BORE - OVERSIZE METRIC:
    STANDARD
    BORE SIZE METRIC:
    66.40 MM
    MODEL:
    RACER'S CHOICE
    PISTON MATERIAL:
    ALUMINUM
    PISTON MATERIAL:
    FORGED
    UNITS:
    EACH
    PRODUCT NAME:
    REBUILD KIT
    STROKE LENGTH METRIC:
    72.00 MM
    RIDING STYLE:
    OFF-ROAD
    TYPE:
    TOP END
    Qty in Cart: 0
    Quantity:
    Price:
    $309.95
    Subtotal:
  • Wiseco Honda CRF450R 2002-2008 Piston Kit PK1233

    Wiseco Honda CRF450R 2002-2008 Piston Kit PK1233

    WISECO

    $390.95
    When you're rebuilding a CRF450R top end, you need a piston kit that matches the precision your engine demands. The Wiseco PK1233 delivers the bore accuracy and compression ratio necessary for consistent power gains and extended durability, whether...
    09030552
    SKU:
    09030552
    Availability:
    Ships Same Business Day
    Weight:
    1.55 LBS
    BORE SIZE METRIC:
    96.00 MM
    MODEL:
    FORGED SERIES
    BORE - OVERSIZE:
    STANDARD
    BORE - OVERSIZE METRIC:
    STANDARD
    DISPLACEMENT:
    449 CC
    PISTON DIAMETER METRIC:
    95.94 MM
    SKIRT COATING:
    ARMORGLIDE®
    UNITS:
    KIT
    COMPRESSION RATIO IMPERIAL:
    12.5:1
    PRODUCT NAME:
    REBUILD KIT
    STROKE LENGTH METRIC:
    62.10 MM
    ENGINE TYPE:
    4-STROKE
    PISTON MATERIAL:
    2618 ALUMINUM ALLOY
    RIDING STYLE:
    OFF-ROAD
    TYPE:
    TOP END
    Qty in Cart: 0
    Quantity:
    Price:
    $390.95
    Subtotal:
  • Wiseco Piston Kit 77mm 13.1:1 for 2004-2005 Kawasaki KX250F PK1237

    Wiseco Piston Kit 77mm 13.1:1 for 2004-2005 Kawasaki KX250F PK1237

    WISECO

    $308.95
    A complete top-end rebuild demands precision components that can handle sustained high RPMs and aggressive tuning. The Wiseco PK1237 delivers race-proven engineering in a bolt-together package, letting you maximize combustion efficiency without guesswork...
    09030555
    SKU:
    09030555
    Availability:
    Ships Same Business Day
    Weight:
    1.10 LBS
    BORE - OVERSIZE METRIC:
    STANDARD
    PISTON MATERIAL:
    2618 ALUMINUM ALLOY
    PRODUCT NAME:
    REBUILD KIT
    BORE - OVERSIZE:
    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
    COMPRESSION RATIO IMPERIAL:
    13.1:1
    PISTON DIAMETER METRIC:
    76.96 MM
    RIDING STYLE:
    OFF-ROAD
    TYPE:
    TOP END
    UNITS:
    KIT
    Qty in Cart: 0
    Quantity:
    Price:
    $308.95
    Subtotal:
  • Wiseco Yamaha WR250F 2005-2013 Piston Kit PK1384

    Wiseco Yamaha WR250F 2005-2013 Piston Kit PK1384

    WISECO

    $344.95
    When your WR250F's top end shows wear, you lose compression, reliability, and the crisp power delivery that keeps you competitive. The Wiseco PK1384 restores full performance with OEM-quality pistons and a complete gasket set, eliminating guesswork...
    09030558
    SKU:
    09030558
    Availability:
    Ships Same Business Day
    Weight:
    1.15 LBS
    ENGINE TYPE:
    4-STROKE
    PISTON MATERIAL:
    2618 ALUMINUM ALLOY
    TYPE:
    TOP END
    PISTON DIAMETER METRIC:
    76.95 MM
    PRODUCT NAME:
    REBUILD KIT
    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:
    77.00 MM
    DISPLACEMENT:
    250 CC
    MODEL:
    FORGED SERIES
    RIDING STYLE:
    STREET
    STROKE LENGTH METRIC:
    53.60 MM
    Qty in Cart: 0
    Quantity:
    Price:
    $344.95
    Subtotal:
  • Wiseco YZ250F 2005-2007 WR250F 2005-2013 Piston Kit with Gaskets PK1401

    Wiseco YZ250F 2005-2007 WR250F 2005-2013 Piston Kit with Gaskets PK1401

    WISECO

    $299.95
    When your YZ250F or WR250F starts showing signs of wear—loss of compression, rough idle, or declining power—a top-end rebuild is often the most cost-effective way to restore full performance. The Wiseco PK1401 gives you OEM-quality components with proven...
    09030559
    SKU:
    09030559
    Availability:
    Ships Same Business Day
    Weight:
    1.25 LBS
    BORE - OVERSIZE:
    STANDARD
    ENGINE TYPE:
    4-STROKE
    PISTON MATERIAL:
    2618 ALUMINUM ALLOY
    PRODUCT NAME:
    REBUILD KIT
    BORE - OVERSIZE METRIC:
    STANDARD
    RIDING STYLE:
    OFF-ROAD
    UNITS:
    KIT
    COMPRESSION RATIO IMPERIAL:
    12.5:1
    PISTON DIAMETER METRIC:
    76.95 MM
    TYPE:
    TOP END
    BORE SIZE METRIC:
    77.00 MM
    DISPLACEMENT:
    250 CC
    MODEL:
    FORGED SERIES
    SKIRT COATING:
    NON-COATED
    STROKE LENGTH METRIC:
    53.60 MM
    Qty in Cart: 0
    Quantity:
    Price:
    $299.95
    Subtotal:
  • Wiseco Piston Kit Standard 39mm 11:1 Compression Honda Z50R 1982-1987 4828M03900

    Wiseco Piston Kit Standard 39mm 11:1 Compression Honda Z50R 1982-1987 4828M03900

    WISECO

    $119.95
    If you're running a Honda Z50R and want to maximize power output without sacrificing reliability, the Wiseco 4828M03900 piston kit delivers the compression ratio and material quality needed for consistent performance gains. The 11:1 compression ratio...
    09100738
    SKU:
    09100738
    Availability:
    Ships Same Business Day
    Weight:
    0.20 LBS
    PISTON MATERIAL:
    FORGED
    RIDING STYLE:
    STREET
    STROKE LENGTH METRIC:
    41.40 MM
    COMPRESSION RATIO IMPERIAL:
    11.0:1
    BORE - OVERSIZE:
    STANDARD
    BORE - OVERSIZE METRIC:
    STANDARD
    PRODUCT NAME:
    PISTON
    BORE SIZE METRIC:
    39.00 MM
    DISPLACEMENT:
    49,50 CC
    ENGINE TYPE:
    4-STROKE
    PISTON MATERIAL:
    ALUMINUM ALLOY
    UNITS:
    EACH
    Qty in Cart: 0
    Quantity:
    Price:
    $119.95
    Subtotal:
  • Total: items /

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Big Power, Nice Sound!

Picked up a Pro Circuit pipe and silencer for my YZ125 it’s a game changer. The power feels way better and the sound is awesome.

Tyler D. - 06/12

Perfect Fit

First time ordering here and dang y’all knocked it outta the park! The wheels fit my Ranger UTV perfect, and I’ll definitely be back for more 5 stars all day!

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Ordered on a Monday, and it was on my doorstep by Wednesday! Super impressed with how fast the shipping was.

Jason P. - 09/13

Helps keep cool, works great!

Bought the dual pass Allstar radiator for my build, and it’s been solid. Keeps the engine running cool even on the hottest days no complaints here!

Jake M. - 05/21

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