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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 67.50mm for Honda CR250R 2002-2004 702M06750

    Wiseco Piston Kit 67.50mm for Honda CR250R 2002-2004 702M06750

    WISECO

    $221.95
    When you're pushing your CR250R to the limit, a stock piston won't cut it. The Wiseco 67.50mm piston kit delivers the precision engineering and durability you need to maintain peak performance lap after lap, whether you're competing at the highest level...
    702M06700
    SKU:
    702M06700
    Availability:
    Ships Same Business Day
    Weight:
    0.05 LBS
    BORE SIZE METRIC:
    67.00 MM
    ENGINE TYPE:
    2-STROKE
    PISTON MATERIAL:
    ALUMINUM ALLOY
    PRODUCT NAME:
    PISTON
    UNITS:
    EACH
    PISTON MATERIAL:
    FORGED
    BORE - OVERSIZE:
    +0,60 MM
    BORE - OVERSIZE METRIC:
    +0.60 MM
    DISPLACEMENT:
    249 CC
    STROKE LENGTH:
    72,00 MM
    STROKE LENGTH METRIC:
    72.00 MM
    RIDING STYLE:
    OFF-ROAD
    Qty in Cart: 0
    Quantity:
    Price:
    $221.95
    Subtotal:
  • Wiseco Piston 1.10mm Oversize for 2001 Honda CR250R 702M06750

    Wiseco Piston 1.10mm Oversize for 2001 Honda CR250R 702M06750

    WISECO

    $199.95
    When you're pushing your CR250 to the edge, your factory piston becomes the weakest link. The Wiseco 702M06750 is built to handle the demands of high-RPM racing with a high-silicon aluminum forging that resists detonation and thermal stress far better...
    702M06750
    SKU:
    702M06750
    Availability:
    Ships Same Business Day
    Weight:
    0.75 LBS
    DISPLACEMENT:
    249 CC
    BORE - OVERSIZE:
    +1,10 MM
    BORE - OVERSIZE METRIC:
    +1.10 MM
    BORE SIZE METRIC:
    67.50 MM
    ENGINE TYPE:
    2-STROKE
    PISTON MATERIAL:
    ALUMINUM ALLOY
    PRODUCT NAME:
    PISTON
    STROKE LENGTH:
    72,00 MM
    UNITS:
    EACH
    PISTON MATERIAL:
    FORGED
    RIDING STYLE:
    OFF-ROAD
    STROKE LENGTH METRIC:
    72.00 MM
    $199.95
    Qty in Cart: 0
    Quantity:
    Price:
    $199.95
    Subtotal:
  • Wiseco Piston Kit 66.4mm Honda CR250R 2002-2004 802M06640

    Wiseco Piston Kit 66.4mm Honda CR250R 2002-2004 802M06640

    WISECO

    $224.95
    When your CR250R's piston shows signs of wear or you're rebuilding after a top-end failure, a quality replacement is non-negotiable. The Wiseco 702M06800 delivers OEM-equivalent fitment with materials engineered to handle the high RPM demands of...
    702M06800
    SKU:
    702M06800
    Availability:
    Ships Same Business Day
    Weight:
    0.65 LBS
    ENGINE TYPE:
    2-STROKE
    BORE - OVERSIZE:
    +1,60 MM
    BORE SIZE METRIC:
    68.00 MM
    STROKE LENGTH METRIC:
    72.00 MM
    BORE - OVERSIZE METRIC:
    +1.60 MM
    PISTON MATERIAL:
    FORGED
    RIDING STYLE:
    OFF-ROAD
    DISPLACEMENT:
    249 CC
    PISTON MATERIAL:
    ALUMINUM ALLOY
    PRODUCT NAME:
    PISTON
    STROKE LENGTH:
    72,00 MM
    UNITS:
    EACH
    $224.95
    Qty in Cart: 0
    Quantity:
    Price:
    $224.95
    Subtotal:
  • Wiseco Piston Kit 66.40mm Standard Bore Suzuki RM250 1996-1997 681M06640

    Wiseco Piston Kit 66.40mm Standard Bore Suzuki RM250 1996-1997 681M06640

    WISECO

    $207.95
    The Wiseco 681M06640 is engineered for riders who demand reliability and responsive power from their RM250. Wiseco's forged aluminum construction delivers the durability needed for competitive riding and extended trail sessions, while precision...
    681M06640
    SKU:
    681M06640
    Availability:
    Ships Same Business Day
    Weight:
    0.70 LBS
    DISPLACEMENT:
    249 CC
    RIDING STYLE:
    OFF-ROAD
    STROKE LENGTH:
    72,00 MM
    STROKE LENGTH METRIC:
    72.00 MM
    BORE SIZE METRIC:
    66.40 MM
    BORE - OVERSIZE:
    STANDARD
    BORE - OVERSIZE METRIC:
    STANDARD
    ENGINE TYPE:
    2-STROKE
    PISTON MATERIAL:
    ALUMINUM ALLOY
    PRODUCT NAME:
    PISTON
    UNITS:
    EACH
    PISTON MATERIAL:
    FORGED
    $207.95
    Qty in Cart: 0
    Quantity:
    Price:
    $207.95
    Subtotal:
  • Wiseco Piston Kit 48.00mm 0.50mm Oversize for Suzuki RM80 1991-2001 645M04800

    Wiseco Piston Kit 48.00mm 0.50mm Oversize for Suzuki RM80 1991-2001 645M04800

    WISECO

    $134.95
    The Wiseco 645M04800 is engineered for Suzuki RM80 owners ready to restore lost compression and revive engine responsiveness after thousands of riding hours. A properly sized piston kit is critical for maintaining the seal integrity and power delivery...
    645M04800
    SKU:
    645M04800
    Availability:
    Ships Same Business Day
    Weight:
    0.35 LBS
    BORE - OVERSIZE METRIC:
    +0.50 MM
    BORE SIZE METRIC:
    48.00 MM
    DISPLACEMENT:
    82 CC
    BORE - OVERSIZE:
    +0,50 MM
    ENGINE TYPE:
    2-STROKE
    RIDING STYLE:
    OFF-ROAD
    STROKE LENGTH METRIC:
    46.80 MM
    UNITS:
    EACH
    PISTON MATERIAL:
    ALUMINUM ALLOY
    PISTON MATERIAL:
    FORGED
    PRODUCT NAME:
    PISTON
    STROKE LENGTH:
    46,80 MM
    $134.95
    Qty in Cart: 0
    Quantity:
    Price:
    $134.95
    Subtotal:
  • Wiseco Piston Kit Suzuki RM 80 1989-1990 48.50 mm 579M04850

    Wiseco Piston Kit Suzuki RM 80 1989-1990 48.50 mm 579M04850

    WISECO

    $134.95
    The Wiseco 645M04850 is a complete piston kit engineered for Suzuki RM80 2-stroke engines, delivering the precision and durability competitive riders demand. If you're rebuilding after a top-end failure or upgrading for increased power output, this...
    645M04850
    SKU:
    645M04850
    Availability:
    Ships Same Business Day
    Weight:
    0.35 LBS
    BORE - OVERSIZE METRIC:
    +1.00 MM
    BORE SIZE METRIC:
    48.50 MM
    PISTON MATERIAL:
    ALUMINUM ALLOY
    PISTON MATERIAL:
    FORGED
    UNITS:
    EACH
    DISPLACEMENT:
    82 CC
    ENGINE TYPE:
    2-STROKE
    RIDING STYLE:
    OFF-ROAD
    STROKE LENGTH:
    46,80 MM
    STROKE LENGTH METRIC:
    46.80 MM
    BORE - OVERSIZE:
    +1,00 MM
    PRODUCT NAME:
    PISTON
    $134.95
    Qty in Cart: 0
    Quantity:
    Price:
    $134.95
    Subtotal:
  • Wiseco Piston Kit Kawasaki KX60 1983-2003 43mm Standard 648M04300

    Wiseco Piston Kit Kawasaki KX60 1983-2003 43mm Standard 648M04300

    WISECO

    $128.95
    If you're running a KX60 hard enough to wear out the factory piston, you need a replacement that matches your commitment to performance. Wiseco's 648M04300 kit delivers the precision tolerances and material quality required to restore—or exceed—your...
    648M04300
    SKU:
    648M04300
    Availability:
    Ships Same Business Day
    Weight:
    0.26 LBS
    BORE SIZE METRIC:
    43.00 MM
    STROKE LENGTH:
    41,60 MM
    ENGINE TYPE:
    2-STROKE
    RIDING STYLE:
    OFF-ROAD
    BORE - OVERSIZE:
    STANDARD
    DISPLACEMENT:
    60 CC
    PISTON MATERIAL:
    ALUMINUM ALLOY
    PISTON MATERIAL:
    FORGED
    UNITS:
    EACH
    BORE - OVERSIZE METRIC:
    STANDARD
    PRODUCT NAME:
    PISTON
    STROKE LENGTH METRIC:
    41.60 MM
    $128.95
    Qty in Cart: 0
    Quantity:
    Price:
    $128.95
    Subtotal:
  • Wiseco Piston Kit Kawasaki KX 60 1990-2003 43.5mm Bore 648M04350

    Wiseco Piston Kit Kawasaki KX 60 1990-2003 43.5mm Bore 648M04350

    WISECO

    $119.95
    If you're running a KX 60 and want to restore or maximize engine performance, a quality piston kit is non-negotiable. Wiseco's 648M04350 delivers the precision fit and durability that 2-stroke engines demand, whether you're prepping for competition or...
    648M04350
    SKU:
    648M04350
    Availability:
    Ships Same Business Day
    Weight:
    0.35 LBS
    BORE - OVERSIZE:
    +0,50 MM
    PRODUCT NAME:
    PISTON
    RIDING STYLE:
    OFF-ROAD
    STROKE LENGTH METRIC:
    41.60 MM
    BORE - OVERSIZE METRIC:
    +0.50 MM
    BORE SIZE METRIC:
    43.50 MM
    ENGINE TYPE:
    2-STROKE
    DISPLACEMENT:
    60 CC
    PISTON MATERIAL:
    ALUMINUM ALLOY
    PISTON MATERIAL:
    FORGED
    STROKE LENGTH:
    41,60 MM
    UNITS:
    EACH
    $119.95
    Qty in Cart: 0
    Quantity:
    Price:
    $119.95
    Subtotal:
  • Wiseco Piston Standard Yamaha PW 80 1991-2006 649M04700

    Wiseco Piston Standard Yamaha PW 80 1991-2006 649M04700

    WISECO

    $134.95
    A 2-stroke piston kit lives a brutal life—extreme temperatures, violent combustion cycles, and constant pressure demand a component that won't fail mid-race or mid-ride. The Wiseco 649M04700 is engineered with forged aluminum construction and precision...
    649M04700
    SKU:
    649M04700
    Availability:
    Ships Same Business Day
    Weight:
    0.20 LBS
    BORE - OVERSIZE:
    STANDARD
    PISTON MATERIAL:
    ALUMINUM ALLOY
    PISTON MATERIAL:
    FORGED
    STROKE LENGTH:
    42,00 MM
    STROKE LENGTH METRIC:
    42.00 MM
    UNITS:
    EACH
    BORE - OVERSIZE METRIC:
    STANDARD
    BORE SIZE METRIC:
    47.00 MM
    PRODUCT NAME:
    PISTON
    DISPLACEMENT:
    72 CC
    ENGINE TYPE:
    2-STROKE
    RIDING STYLE:
    OFF-ROAD
    Qty in Cart: 0
    Quantity:
    Price:
    $134.95
    Subtotal:
  • Wiseco Piston Kit 47.50mm for Yamaha PW80 1991-2006 649M04750

    Wiseco Piston Kit 47.50mm for Yamaha PW80 1991-2006 649M04750

    WISECO

    $141.95
    A worn or damaged piston directly kills your PW80's power delivery and reliability. The Wiseco 649M04750 restores full combustion efficiency and throttle response with forged aluminum construction engineered to OEM specs, ensuring your 2-stroke runs...
    649M04750
    SKU:
    649M04750
    Availability:
    Ships Same Business Day
    Weight:
    0.15 LBS
    BORE - OVERSIZE:
    +0,50 MM
    BORE SIZE METRIC:
    47.50 MM
    PRODUCT NAME:
    PISTON
    RIDING STYLE:
    OFF-ROAD
    BORE - OVERSIZE METRIC:
    +0.50 MM
    STROKE LENGTH METRIC:
    42.00 MM
    ENGINE TYPE:
    2-STROKE
    DISPLACEMENT:
    72 CC
    PISTON MATERIAL:
    ALUMINUM ALLOY
    PISTON MATERIAL:
    FORGED
    STROKE LENGTH:
    42,00 MM
    UNITS:
    EACH
    $141.95
    Qty in Cart: 0
    Quantity:
    Price:
    $141.95
    Subtotal:
  • Wiseco Piston Kit 77mm 13.4:1 Compression for Suzuki RM-Z250 2010-2018 PK1877

    Wiseco Piston Kit 77mm 13.4:1 Compression for Suzuki RM-Z250 2010-2018 PK1877

    WISECO

    $291.95
    When you're rebuilding your RM-Z250's top end, you need a piston kit that delivers repeatable power and reliability without compromise. Wiseco's forged aluminum construction and 13.4:1 compression ratio give you the horsepower and torque gains you're...
    09031166
    SKU:
    09031166
    Availability:
    Ships Same Business Day
    Weight:
    1.05 LBS
    PISTON MATERIAL:
    2618 ALUMINUM ALLOY
    RIDING STYLE:
    OFF-ROAD
    UNITS:
    KIT
    PRODUCT NAME:
    REBUILD KIT
    SKIRT COATING:
    ARMORGLIDE®
    BORE - OVERSIZE:
    STANDARD
    BORE - OVERSIZE METRIC:
    STANDARD
    BORE SIZE METRIC:
    77.00 MM
    COMPRESSION RATIO IMPERIAL:
    13.4:1
    DISPLACEMENT:
    250 CC
    ENGINE TYPE:
    4-STROKE
    PISTON DIAMETER METRIC:
    76.96 MM
    MODEL:
    FORGED SERIES
    STROKE LENGTH METRIC:
    53.60 MM
    TYPE:
    TOP END
    $291.95
    Qty in Cart: 0
    Quantity:
    Price:
    $291.95
    Subtotal:
  • Wiseco Piston for Arctic Cat 600 2000-2002 2084M06800

    Wiseco Piston for Arctic Cat 600 2000-2002 2084M06800

    WISECO

    $144.95
    Stock pistons wear out—especially in high-demand snowmobile engines. The Wiseco 2084M06800 delivers the precision engineering and durability you need to restore lost compression, regain peak power, and keep your Arctic Cat 600 running reliably through...
    2084M06800
    SKU:
    2084M06800
    Availability:
    Ships Same Business Day
    Weight:
    0.80 LBS
    MODEL:
    PRO-LITE
    PISTON DIAMETER METRIC:
    67.92 MM
    SKIRT COATING:
    NON-COATED
    UNITS:
    KIT
    BORE - OVERSIZE METRIC:
    STANDARD
    DISPLACEMENT:
    436 CC
    STROKE LENGTH METRIC:
    60.00 MM
    BORE SIZE METRIC:
    68.00 MM
    PISTON MATERIAL:
    4032 ALUMINUM ALLOY
    RIDING STYLE:
    SNOW
    BORE - OVERSIZE:
    STANDARD
    ENGINE TYPE:
    2-STROKE
    PRODUCT NAME:
    PISTON KIT
    $144.95
    Qty in Cart: 0
    Quantity:
    Price:
    $144.95
    Subtotal:
  • Wiseco Piston Kit 48.50mm Bore 9.7:1 Compression Ratio 4665M04850

    Wiseco Piston Kit 48.50mm Bore 9.7:1 Compression Ratio 4665M04850

    WISECO

    $154.95
    The Wiseco 4665M04850 Piston Kit delivers the precision engineering your 4-stroke engine needs for consistent power and longevity, whether you're pushing hard on the track or tackling demanding trail conditions. A 9.7:1 compression ratio maximizes...
    09100325
    SKU:
    09100325
    Availability:
    Ships Same Business Day
    Weight:
    0.45 LBS
    BORE - OVERSIZE:
    +1,00 MM
    DISPLACEMENT:
    83 CC
    PISTON MATERIAL:
    FORGED
    BORE - OVERSIZE METRIC:
    +1.00 MM
    PISTON MATERIAL:
    ALUMINUM ALLOY
    PRODUCT NAME:
    PISTON
    STROKE LENGTH METRIC:
    45.00 MM
    BORE SIZE METRIC:
    48.50 MM
    ENGINE TYPE:
    4-STROKE
    RIDING STYLE:
    OFF-ROAD
    UNITS:
    EACH
    $154.95
    Qty in Cart: 0
    Quantity:
    Price:
    $154.95
    Subtotal:
  • Wiseco Piston Kit 53.5mm Bore Honda XR100R 1985-2003 4666M05350

    Wiseco Piston Kit 53.5mm Bore Honda XR100R 1985-2003 4666M05350

    WISECO

    $160.95
    If you're running a Honda XR100R and want to reliably extract more power without sacrificing engine longevity, a quality piston kit is non-negotiable. The Wiseco 4666M05350 replaces worn or damaged pistons with a precision-engineered component that...
    09100328
    SKU:
    09100328
    Availability:
    Ships Same Business Day
    Weight:
    0.25 LBS
    BORE SIZE METRIC:
    53.50 MM
    COMPRESSION RATIO IMPERIAL:
    9.4:1
    BORE - OVERSIZE METRIC:
    +0.50 MM
    ENGINE TYPE:
    4-STROKE
    BORE - OVERSIZE:
    +0,50 MM
    PISTON MATERIAL:
    FORGED
    PRODUCT NAME:
    PISTON
    RIDING STYLE:
    OFF-ROAD
    DISPLACEMENT:
    101,00 CC
    PISTON MATERIAL:
    ALUMINUM ALLOY
    STROKE LENGTH METRIC:
    45.00 MM
    UNITS:
    EACH
    Qty in Cart: 0
    Quantity:
    Price:
    $160.95
    Subtotal:
  • Wiseco Piston Kit 76mm 13.5:1 Compression for KTM 250 SX-F 2006-2012 40006M07600

    Wiseco Piston Kit 76mm 13.5:1 Compression for KTM 250 SX-F 2006-2012 40006M07600

    WISECO

    $279.95
    A worn piston compromises combustion efficiency and throttle response—exactly what you can't afford in competitive racing or high-demand trail riding. The Wiseco 40006M07600 delivers the compression ratio and durability required to extract maximum power...
    09100848
    SKU:
    09100848
    Availability:
    Ships Same Business Day
    Weight:
    0.60 LBS
    DISPLACEMENT:
    262,80 CC
    ENGINE TYPE:
    4-STROKE
    PISTON MATERIAL:
    ALUMINUM ALLOY
    RIDING STYLE:
    OFF-ROAD
    UNITS:
    EACH
    BORE - OVERSIZE:
    STANDARD
    BORE - OVERSIZE METRIC:
    STANDARD
    PRODUCT NAME:
    PISTON
    SKIRT COATING:
    ARMORGLIDE®
    DISPLACEMENT:
    249,5 CC
    BORE SIZE METRIC:
    76.00 MM
    COMPRESSION RATIO IMPERIAL:
    13.0:1
    PISTON MATERIAL:
    FORGED
    RIDING STYLE:
    STREET
    $279.95
    Qty in Cart: 0
    Quantity:
    Price:
    $279.95
    Subtotal:
  • Wiseco Piston Kit 97mm 12.2:1 Compression for 2007-2012 KTM 450 SX-F 4937M09700

    Wiseco Piston Kit 97mm 12.2:1 Compression for 2007-2012 KTM 450 SX-F 4937M09700

    WISECO

    $254.95
    If you're running a 2007-2012 KTM 450 SX-F and need to restore or upgrade your top-end, the Wiseco 4937M09700 piston kit delivers the precision fit and proven durability that serious riders depend on. Wiseco's forged aluminum construction combined with...
    09100850
    SKU:
    09100850
    Availability:
    Ships Same Business Day
    Weight:
    0.90 LBS
    BORE - OVERSIZE METRIC:
    +2.00 MM
    RIDING STYLE:
    ATV
    RIDING STYLE:
    OFF-ROAD
    BORE SIZE METRIC:
    97.00 MM
    COMPRESSION RATIO IMPERIAL:
    12.5:1
    ENGINE TYPE:
    4-STROKE
    PISTON MATERIAL:
    ALUMINUM ALLOY
    UNITS:
    EACH
    DISPLACEMENT:
    449 CC
    BORE - OVERSIZE:
    +2,00 MM
    PISTON MATERIAL:
    FORGED
    PRODUCT NAME:
    PISTON
    SKIRT COATING:
    MOLY COATED
    $254.95
    Qty in Cart: 0
    Quantity:
    Price:
    $254.95
    Subtotal:
  • Wiseco Honda CR250R 2002-2004 Piston Kit with Gaskets PK1196

    Wiseco Honda CR250R 2002-2004 Piston Kit with Gaskets PK1196

    WISECO

    $259.95
    If you're rebuilding your CR250R top-end or looking to restore lost compression and power, the Wiseco PK1196 delivers the precision engineering that separates a proper rebuild from a Band-Aid fix. This complete piston kit includes all gaskets and...
    09030542
    SKU:
    09030542
    Availability:
    Ships Same Business Day
    Weight:
    1.20 LBS
    PRODUCT NAME:
    REBUILD KIT
    BORE - OVERSIZE:
    +1,10 MM
    BORE - OVERSIZE METRIC:
    +1.10 MM
    PISTON DIAMETER METRIC:
    67.46 MM
    PISTON MATERIAL:
    4032 ALUMINUM ALLOY
    RIDING STYLE:
    OFF-ROAD
    UNITS:
    KIT
    BORE SIZE METRIC:
    67.50 MM
    DISPLACEMENT:
    249 CC
    ENGINE TYPE:
    2-STROKE
    MODEL:
    PRO-LITE
    TYPE:
    TOP END
    SKIRT COATING:
    NON-COATED
    STROKE LENGTH METRIC:
    72.00 MM
    Qty in Cart: 0
    Quantity:
    Price:
    $259.95
    Subtotal:
  • Wiseco Piston Kit Standard 77mm 13.4:1 Compression Ratio for Suzuki RM-Z250 2007-2009 4921M07700

    Wiseco Piston Kit Standard 77mm 13.4:1 Compression Ratio for Suzuki RM-Z250 2007-2009 4921M07700

    WISECO

    $224.95
    If you're running a 2007-2009 Suzuki RM-Z250 and want measurable gains in throttle response and mid-range torque, a quality piston kit is non-negotiable. The Wiseco 4921M07700 delivers the compression ratio and forged construction that serious riders...
    09100852
    SKU:
    09100852
    Availability:
    Ships Same Business Day
    Weight:
    0.52 LBS
    UNITS:
    KIT
    BORE SIZE METRIC:
    77.00 MM
    DISPLACEMENT:
    250 CC
    ENGINE TYPE:
    4-STROKE
    PISTON MATERIAL:
    ALUMINUM ALLOY
    STROKE LENGTH METRIC:
    53.60 MM
    PISTON MATERIAL:
    FORGED
    RIDING STYLE:
    OFF-ROAD
    BORE - OVERSIZE:
    STANDARD
    BORE - OVERSIZE METRIC:
    STANDARD
    COMPRESSION RATIO IMPERIAL:
    13.4:1
    PRODUCT NAME:
    PISTON
    SKIRT COATING:
    MOLY COATED
    Qty in Cart: 0
    Quantity:
    Price:
    $224.95
    Subtotal:
  • Wiseco Piston Kit with Gaskets for Suzuki RM125 1991-1996 55.50mm PK1321

    Wiseco Piston Kit with Gaskets for Suzuki RM125 1991-1996 55.50mm PK1321

    WISECO

    $234.95
    A worn top-end is a performance killer on any 2-stroke—compression drops, power fades, and reliability suffers. The Wiseco PK1321 gives you everything needed for a complete, professional-grade rebuild in one kit, eliminating guesswork and getting you...
    09030548
    SKU:
    09030548
    Availability:
    Ships Same Business Day
    Weight:
    0.75 LBS
    BORE - OVERSIZE METRIC:
    +1.50 MM
    SKIRT COATING:
    NON-COATED
    BORE SIZE METRIC:
    55.50 MM
    ENGINE TYPE:
    2-STROKE
    MODEL:
    PRO-LITE
    PISTON DIAMETER METRIC:
    55.46 MM
    TYPE:
    TOP END
    BORE - OVERSIZE:
    +1,50 MM
    DISPLACEMENT:
    123 CC
    PISTON MATERIAL:
    4032 ALUMINUM ALLOY
    RIDING STYLE:
    OFF-ROAD
    STROKE LENGTH METRIC:
    54.00 MM
    UNITS:
    KIT
    PRODUCT NAME:
    REBUILD KIT
    $234.95
    Qty in Cart: 0
    Quantity:
    Price:
    $234.95
    Subtotal:
  • Wiseco Piston Kit for Honda CRF250R 2004-2007 CRF250X 2004-2009 2012-2017 PK1236

    Wiseco Piston Kit for Honda CRF250R 2004-2007 CRF250X 2004-2009 2012-2017 PK1236

    WISECO

    $326.95
    When your Honda CRF250R or CRF250X's top-end reaches its limits, a quality rebuild kit is essential to restore compression, throttle response, and reliability. The Wiseco PK1236 delivers OEM-quality components engineered to exacting tolerances—ensuring...
    09030553
    SKU:
    09030553
    Availability:
    Ships Same Business Day
    Weight:
    1.25 LBS
    BORE - OVERSIZE:
    STANDARD
    BORE - OVERSIZE METRIC:
    STANDARD
    DISPLACEMENT:
    249 CC
    PRODUCT NAME:
    REBUILD KIT
    SKIRT COATING:
    ARMORGLIDE®
    STROKE LENGTH METRIC:
    52.20 MM
    BORE SIZE METRIC:
    78.00 MM
    PISTON DIAMETER METRIC:
    77.95 MM
    PISTON MATERIAL:
    2618 ALUMINUM ALLOY
    RIDING STYLE:
    OFF-ROAD
    COMPRESSION RATIO IMPERIAL:
    12.9:1
    ENGINE TYPE:
    4-STROKE
    MODEL:
    FORGED SERIES
    TYPE:
    TOP END
    UNITS:
    KIT
    $326.95
    Qty in Cart: 0
    Quantity:
    Price:
    $326.95
    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!

Sarah L. - 08/24

Fast Shipping!!

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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