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Dirt Bike Engine

Dirt Bike Engine

Dirt Bike Engine

Dirt Bike Engine Parts at JJ Motorsports

Discover a full range of dirt bike engine components for rebuilding or upgrading your performance from JJ Motorsports. From crankshafts to cylinder heads and piston kits, these precision-engineered components ensure reliable performance. For additional upgrades, check out our full selection of off-road dirt bike parts to keep your engine running at peak efficiency on the track or trails.

Shop trusted brands like Wiseco for forged piston kits and K&N for high-flow oil filters. Explore related categories such as Dirt Bike Air and Fuel for intake upgrades or Dirt Bike Exhaust for complete systems.

Browse our in-stock inventory below with same-day shipping and expert support. Questions? Contact us for fitment advice!

  • Product
  • Qty in Cart
  • Quantity
  • Price
  • Subtotal
  • On Sale
    Wiseco Honda XR200 1980-1983 Piston Kit with Gaskets 66.50mm PK1118

    Wiseco Honda XR200 1980-1983 Piston Kit with Gaskets 66.50mm PK1118

    WISECO

    MSRP: $204.95
    Now: $174.00
    Was: $204.95
    A quality top-end rebuild is critical for maintaining the power and reliability of your XR200, and the Wiseco PK1118 kit gives you everything needed in one package. High-silicone forged construction resists thermal stress and maintains ring seal...
    09030235
    SKU:
    09030235
    Availability:
    Ships Same Business Day
    Weight:
    1.00 LBS
    BORE SIZE METRIC:
    66.50 MM
    PISTON DIAMETER METRIC:
    66.45 MM
    TYPE:
    TOP END
    BORE - OVERSIZE:
    +1,00 MM
    DISPLACEMENT:
    192 CC
    PISTON MATERIAL:
    2618 ALUMINUM ALLOY
    STROKE LENGTH METRIC:
    57.80 MM
    BORE - OVERSIZE METRIC:
    +1.00 MM
    ENGINE TYPE:
    4-STROKE
    RIDING STYLE:
    OFF-ROAD
    SKIRT COATING:
    NON-COATED
    UNITS:
    KIT
    COMPRESSION RATIO IMPERIAL:
    10.0:1
    MODEL:
    FORGED SERIES
    PRODUCT NAME:
    REBUILD KIT
    MSRP: $204.95
    Now: $174.00
    Was: $204.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $204.95
    Now: $174.00
    Was: $204.95
    Subtotal:
  • On Sale
    Wiseco Piston Kit with Gaskets for Kawasaki KX65 2000-2020 PK1177

    Wiseco Piston Kit with Gaskets for Kawasaki KX65 2000-2020 PK1177

    WISECO

    MSRP: $172.95
    Now: $140.00
    Was: $172.95
    The Wiseco Piston Kit PK1177 is engineered for serious KX65 performance. If you're rebuilding a worn top-end or chasing reliability in competitive riding, this forged piston assembly delivers the strength and precision you need to handle sustained high...
    09030304
    SKU:
    09030304
    Availability:
    Ships Same Business Day
    Weight:
    0.70 LBS
    SKIRT COATING:
    NON-COATED
    UNITS:
    KIT
    BORE SIZE METRIC:
    44.50 MM
    RIDING STYLE:
    OFF-ROAD
    STROKE LENGTH METRIC:
    41.60 MM
    DISPLACEMENT:
    64 CC
    MODEL:
    PRO-LITE
    PRODUCT NAME:
    REBUILD KIT
    TYPE:
    TOP END
    BORE - OVERSIZE:
    STANDARD
    BORE - OVERSIZE METRIC:
    STANDARD
    ENGINE TYPE:
    2-STROKE
    PISTON DIAMETER METRIC:
    44.45 MM
    PISTON MATERIAL:
    4032 ALUMINUM ALLOY
    MSRP: $172.95
    Now: $140.00
    Was: $172.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $172.95
    Now: $140.00
    Was: $172.95
    Subtotal:
  • On Sale
    Wiseco Piston Kit with Gaskets for Kawasaki KX85 2001-2013 PK1187

    Wiseco Piston Kit with Gaskets for Kawasaki KX85 2001-2013 PK1187

    WISECO

    MSRP: $181.95
    Now: $140.00
    Was: $181.95
    When you're rebuilding a 2-stroke top-end, every component matters—and Wiseco's engineered tolerances are designed to keep your KX85 running at peak power without premature wear or ring flutter. This complete piston kit eliminates guesswork by including...
    09030306
    SKU:
    09030306
    Availability:
    Ships Same Business Day
    Weight:
    0.95 LBS
    SKIRT COATING:
    NON-COATED
    STROKE LENGTH METRIC:
    45.80 MM
    BORE - OVERSIZE METRIC:
    STANDARD
    BORE SIZE METRIC:
    48.50 MM
    DISPLACEMENT:
    84.9 CC
    PISTON DIAMETER METRIC:
    48.45 MM
    RIDING STYLE:
    OFF-ROAD
    UNITS:
    KIT
    MODEL:
    PRO-LITE
    PRODUCT NAME:
    REBUILD KIT
    TYPE:
    TOP END
    BORE - OVERSIZE:
    STANDARD
    ENGINE TYPE:
    2-STROKE
    PISTON MATERIAL:
    4032 ALUMINUM ALLOY
    MSRP: $181.95
    Now: $140.00
    Was: $181.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $181.95
    Now: $140.00
    Was: $181.95
    Subtotal:
  • On Sale
    Wiseco 66.40mm Top End Kit for 2002-2004 Honda CR250R PK1195

    Wiseco 66.40mm Top End Kit for 2002-2004 Honda CR250R PK1195

    WISECO

    MSRP: $263.95
    Now: $217.00
    Was: $263.95
    If you're running a 2002-2004 Honda CR250R at the track or on the trail, a worn top end kills power and reliability. The Wiseco 66.40mm Top End Kit restores lost compression and delivers the durability you need for sustained high-RPM performance. This...
    09030307
    SKU:
    09030307
    Availability:
    Ships Same Business Day
    Weight:
    1.39 LBS
    DISPLACEMENT:
    249 CC
    PRODUCT NAME:
    REBUILD KIT
    PISTON MATERIAL:
    4032 ALUMINUM ALLOY
    STROKE LENGTH METRIC:
    72.00 MM
    BORE - OVERSIZE:
    STANDARD
    BORE - OVERSIZE METRIC:
    STANDARD
    ENGINE TYPE:
    2-STROKE
    SKIRT COATING:
    NON-COATED
    BORE SIZE METRIC:
    66.40 MM
    MODEL:
    PRO-LITE
    PISTON DIAMETER METRIC:
    66.36 MM
    RIDING STYLE:
    OFF-ROAD
    TYPE:
    TOP END
    UNITS:
    KIT
    MSRP: $263.95
    Now: $217.00
    Was: $263.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $263.95
    Now: $217.00
    Was: $263.95
    Subtotal:
  • On Sale
    Wiseco YZ250 2002-2025 Piston Kit with Gaskets PK1198

    Wiseco YZ250 2002-2025 Piston Kit with Gaskets PK1198

    WISECO

    MSRP: $272.95
    Now: $208.00
    Was: $272.95
    A worn or damaged piston directly compromises your YZ250's power delivery and engine reliability. This Wiseco kit gives you everything needed for a complete top-end rebuild without sourcing individual components separately. If you're serious about...
    09030308
    SKU:
    09030308
    Availability:
    Ships Same Business Day
    Weight:
    1.30 LBS
    PRODUCT NAME:
    REBUILD KIT
    BORE - OVERSIZE:
    STANDARD
    BORE - OVERSIZE METRIC:
    STANDARD
    ENGINE TYPE:
    2-STROKE
    PISTON DIAMETER METRIC:
    66.36 MM
    SKIRT COATING:
    NON-COATED
    UNITS:
    KIT
    DISPLACEMENT:
    249 CC
    PISTON MATERIAL:
    4032 ALUMINUM ALLOY
    STROKE LENGTH METRIC:
    72.00 MM
    BORE SIZE METRIC:
    66.40 MM
    MODEL:
    PRO-LITE
    RIDING STYLE:
    OFF-ROAD
    TYPE:
    TOP END
    MSRP: $272.95
    Now: $208.00
    Was: $272.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $272.95
    Now: $208.00
    Was: $272.95
    Subtotal:
  • On Sale
    Wiseco Yamaha YZ125 1998-2000 Piston Kit with Gaskets PK1173

    Wiseco Yamaha YZ125 1998-2000 Piston Kit with Gaskets PK1173

    WISECO

    MSRP: $225.95
    Now: $178.00
    Was: $225.95
    A top-end rebuild is non-negotiable if you're serious about YZ125 performance and longevity. Wiseco's forged piston kit delivers the precision fit and thermal stability your 2-stroke demands under sustained high RPM conditions. This complete kit...
    09030309
    SKU:
    09030309
    Availability:
    Ships Same Business Day
    Weight:
    0.55 LBS
    BORE - OVERSIZE:
    STANDARD
    BORE - OVERSIZE METRIC:
    STANDARD
    PISTON MATERIAL:
    4032 ALUMINUM ALLOY
    DISPLACEMENT:
    124 CC
    STROKE LENGTH METRIC:
    54.50 MM
    BORE SIZE METRIC:
    54.00 MM
    ENGINE TYPE:
    2-STROKE
    PRODUCT NAME:
    REBUILD KIT
    TYPE:
    TOP END
    MODEL:
    PRO-LITE
    PISTON DIAMETER METRIC:
    53.95 MM
    RIDING STYLE:
    OFF-ROAD
    SKIRT COATING:
    NON-COATED
    UNITS:
    KIT
    MSRP: $225.95
    Now: $178.00
    Was: $225.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $225.95
    Now: $178.00
    Was: $225.95
    Subtotal:
  • On Sale
    Wiseco Piston Kit with Gaskets for 1997-2001 Honda CR250R PK1168

    Wiseco Piston Kit with Gaskets for 1997-2001 Honda CR250R PK1168

    WISECO

    MSRP: $281.95
    Now: $217.00
    Was: $281.95
    A worn or damaged piston compromises combustion efficiency, throttle response, and engine reliability—especially critical in a 2-stroke where every component works at the edge of its limits. The Wiseco Piston Kit for your CR250R delivers a complete...
    09030311
    SKU:
    09030311
    Availability:
    Ships Same Business Day
    Weight:
    1.38 LBS
    DISPLACEMENT:
    249 CC
    PRODUCT NAME:
    REBUILD KIT
    PISTON MATERIAL:
    4032 ALUMINUM ALLOY
    STROKE LENGTH METRIC:
    72.00 MM
    BORE - OVERSIZE:
    STANDARD
    BORE - OVERSIZE METRIC:
    STANDARD
    ENGINE TYPE:
    2-STROKE
    PISTON DIAMETER METRIC:
    66.36 MM
    SKIRT COATING:
    NON-COATED
    BORE SIZE METRIC:
    66.40 MM
    MODEL:
    PRO-LITE
    RIDING STYLE:
    OFF-ROAD
    TYPE:
    TOP END
    UNITS:
    KIT
    MSRP: $281.95
    Now: $217.00
    Was: $281.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $281.95
    Now: $217.00
    Was: $281.95
    Subtotal:
  • On Sale
    Wiseco YZ250 2002-2022 Piston Kit with Gaskets PK1704

    Wiseco YZ250 2002-2022 Piston Kit with Gaskets PK1704

    WISECO

    MSRP: $291.95
    Now: $234.00
    Was: $291.95
    When you're rebuilding a YZ250 top end, you need a piston kit that delivers consistent performance lap after lap without compromise. The Wiseco PK1704 is engineered specifically for the 2002-2022 YZ250 platform, combining forged construction with...
    09030929
    SKU:
    09030929
    Availability:
    Ships Same Business Day
    Weight:
    1.45 LBS
    COOLING SYSTEM:
    LIQUID COOLED
    DISPLACEMENT:
    249,3 CC
    PRODUCT NAME:
    REBUILD KIT
    STROKE LENGTH METRIC:
    72.00 MM
    BORE - OVERSIZE:
    STANDARD
    BORE - OVERSIZE METRIC:
    STANDARD
    BORE SIZE METRIC:
    66.40 MM
    PISTON MATERIAL:
    ALUMINUM
    PISTON MATERIAL:
    FORGED
    MODEL:
    RACER'S CHOICE
    RIDING STYLE:
    OFF-ROAD
    TYPE:
    TOP END
    UNITS:
    EACH
    MSRP: $291.95
    Now: $234.00
    Was: $291.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $291.95
    Now: $234.00
    Was: $291.95
    Subtotal:
  • On Sale
    Wiseco KX85 2001-2013 Piston Kit with Gaskets PK1762

    Wiseco KX85 2001-2013 Piston Kit with Gaskets PK1762

    WISECO

    MSRP: $192.95
    Now: $153.00
    Was: $192.95
    Two-stroke engines demand precision components that can handle extreme combustion pressures and temperatures without sacrifice. The Wiseco KX85 Piston Kit delivers the durability and reliability you need for consistent performance, whether you're racing...
    09030930
    SKU:
    09030930
    Availability:
    Ships Same Business Day
    Weight:
    0.80 LBS
    DISPLACEMENT:
    84.9 CC
    ENGINE TYPE:
    2-STROKE
    TYPE:
    TOP END
    BORE - OVERSIZE:
    STANDARD
    BORE - OVERSIZE METRIC:
    STANDARD
    MODEL:
    GP SERIES
    PRODUCT NAME:
    REBUILD KIT
    SKIRT COATING:
    ARMORGLIDE®
    BORE SIZE METRIC:
    48.50 MM
    PISTON DIAMETER METRIC:
    48.45 MM
    PISTON MATERIAL:
    4032 ALUMINUM ALLOY
    RIDING STYLE:
    OFF-ROAD
    STROKE LENGTH METRIC:
    45.80 MM
    UNITS:
    KIT
    MSRP: $192.95
    Now: $153.00
    Was: $192.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $192.95
    Now: $153.00
    Was: $192.95
    Subtotal:
  • Wiseco Piston Kit Standard 54mm Honda CR125R 1992-2003 676M05400

    Wiseco Piston Kit Standard 54mm Honda CR125R 1992-2003 676M05400

    WISECO

    $143.95
    The Wiseco Piston Kit delivers the durability and power output your Honda CR125R demands, whether you're pushing hard on the track or logging miles on the trail. Precision-forged from high-silicon aluminum alloy, this piston handles sustained combustion...
    676M05400
    SKU:
    676M05400
    Availability:
    Ships Same Business Day
    Weight:
    0.38 LBS
    BORE SIZE METRIC:
    54.00 MM
    ENGINE TYPE:
    2-STROKE
    PISTON MATERIAL:
    ALUMINUM ALLOY
    UNITS:
    EACH
    STROKE LENGTH:
    54,50 MM
    PISTON MATERIAL:
    FORGED
    RIDING STYLE:
    OFF-ROAD
    STROKE LENGTH METRIC:
    54.50 MM
    BORE - OVERSIZE:
    STANDARD
    BORE - OVERSIZE METRIC:
    STANDARD
    DISPLACEMENT:
    125 CC
    PRODUCT NAME:
    PISTON
    $143.95
    Qty in Cart: 0
    Quantity:
    Price:
    $143.95
    Subtotal:
  • Wiseco Piston Kit 54.50 mm Honda CR125R 1992-2003 676M05450

    Wiseco Piston Kit 54.50 mm Honda CR125R 1992-2003 676M05450

    WISECO

    $154.95
    The Wiseco Piston Kit 54.50 mm is engineered for Honda CR125R riders who demand reliability under extreme conditions. Whether you're pushing lap times on the track or navigating technical terrain, this forged piston delivers the compression, durability,...
    676M05450
    SKU:
    676M05450
    Availability:
    Ships Same Business Day
    Weight:
    0.40 LBS
    BORE - OVERSIZE:
    +0,50 MM
    PISTON MATERIAL:
    FORGED
    PRODUCT NAME:
    PISTON
    RIDING STYLE:
    OFF-ROAD
    PISTON MATERIAL:
    ALUMINUM ALLOY
    UNITS:
    EACH
    BORE - OVERSIZE METRIC:
    +0.50 MM
    BORE SIZE METRIC:
    54.50 MM
    DISPLACEMENT:
    125 CC
    ENGINE TYPE:
    2-STROKE
    STROKE LENGTH:
    54,50 MM
    STROKE LENGTH METRIC:
    54.50 MM
    $154.95
    Qty in Cart: 0
    Quantity:
    Price:
    $154.95
    Subtotal:
  • Wiseco Piston Kit 52.00 mm Oversize Suzuki RM 85 2002-2022 806M05200

    Wiseco Piston Kit 52.00 mm Oversize Suzuki RM 85 2002-2022 806M05200

    WISECO

    $169.95
    When you're rebuilding a Suzuki RM 85 or pushing it to its limits on the track, a quality piston kit isn't optional—it's foundational. The Wiseco +5.00 mm piston delivers the strength and precision needed for sustained high-RPM performance, whether...
    806M05200
    SKU:
    806M05200
    Availability:
    Ships Same Business Day
    Weight:
    0.35 LBS
    DISPLACEMENT:
    99.4 CC
    PRODUCT NAME:
    PISTON
    BORE - OVERSIZE:
    +5,00 MM
    BORE - OVERSIZE METRIC:
    +5.00 MM
    PISTON MATERIAL:
    ALUMINUM ALLOY
    PISTON MATERIAL:
    FORGED
    STROKE LENGTH METRIC:
    46.80 MM
    UNITS:
    EACH
    BORE SIZE METRIC:
    52.00 MM
    ENGINE TYPE:
    2-STROKE
    RIDING STYLE:
    OFF-ROAD
    STROKE LENGTH:
    46,80 MM
    Qty in Cart: 0
    Quantity:
    Price:
    $169.95
    Subtotal:
  • Wiseco Piston Kit 56.00mm 2.00mm Oversize for KTM 125 SX 2001-2021 786M05600

    Wiseco Piston Kit 56.00mm 2.00mm Oversize for KTM 125 SX 2001-2021 786M05600

    WISECO

    $174.95
    If you're running a KTM 125 SX at the edge of performance, a worn or damaged piston directly throttles your power output and reliability. This Wiseco piston kit delivers the compression ratio stability and bore sealing precision that separates consistent...
    786M05600
    SKU:
    786M05600
    Availability:
    Ships Same Business Day
    Weight:
    0.45 LBS
    DISPLACEMENT:
    124 CC
    PISTON MATERIAL:
    FORGED
    RIDING STYLE:
    OFF-ROAD
    STROKE LENGTH METRIC:
    54.50 MM
    BORE - OVERSIZE:
    +2,00 MM
    BORE SIZE METRIC:
    56.00 MM
    PISTON MATERIAL:
    ALUMINUM ALLOY
    PRODUCT NAME:
    PISTON
    BORE - OVERSIZE METRIC:
    +2.00 MM
    ENGINE TYPE:
    2-STROKE
    UNITS:
    EACH
    RIDING STYLE:
    STREET
    STROKE LENGTH:
    54,50 MM
    Qty in Cart: 0
    Quantity:
    Price:
    $174.95
    Subtotal:
  • Wiseco Piston Kit 54mm Bore Kawasaki KX125 2001-2008 788M05400

    Wiseco Piston Kit 54mm Bore Kawasaki KX125 2001-2008 788M05400

    WISECO

    $184.95
    If you're running a KX125 at the edge of the powerband, factory pistons won't cut it—Wiseco's forged design delivers the strength and compression stability needed for consistent performance across competitive sessions. The complete kit eliminates the...
    788M05400
    SKU:
    788M05400
    Availability:
    Ships Same Business Day
    Weight:
    0.42 LBS
    BORE SIZE METRIC:
    54.00 MM
    DISPLACEMENT:
    125 CC
    BORE - OVERSIZE:
    STANDARD
    ENGINE TYPE:
    2-STROKE
    BORE - OVERSIZE METRIC:
    STANDARD
    PISTON MATERIAL:
    ALUMINUM ALLOY
    PISTON MATERIAL:
    FORGED
    PRODUCT NAME:
    PISTON
    RIDING STYLE:
    OFF-ROAD
    UNITS:
    EACH
    STROKE LENGTH:
    54,50 MM
    STROKE LENGTH METRIC:
    54.50 MM
    Qty in Cart: 0
    Quantity:
    Price:
    $184.95
    Subtotal:
  • Wiseco Piston Kit 81mm Yamaha WaveRunner 1994-1997 790M08100

    Wiseco Piston Kit 81mm Yamaha WaveRunner 1994-1997 790M08100

    WISECO

    $154.23
    If you're running a 2-cycle engine in your WaveRunner and pushing performance limits, you need a piston that can handle sustained heat and detonation without failure. The Wiseco 790M08100 delivers the thermal stability and structural integrity required...
    790M08100
    SKU:
    790M08100
    Availability:
    Ships Same Business Day
    Weight:
    1.00 LBS
    BORE - OVERSIZE METRIC:
    STANDARD
    BORE SIZE METRIC:
    81.00 MM
    PISTON MATERIAL:
    ALUMINUM
    PRODUCT NAME:
    PISTON
    BORE - OVERSIZE:
    STANDARD
    DISPLACEMENT:
    701 CC
    UNITS:
    EACH
    RIDING STYLE:
    WATERCRAFT
    Qty in Cart: 0
    Quantity:
    Price:
    $154.23
    Subtotal:
  • Wiseco 80.50mm Piston Kit for Kawasaki 1100 ZXi 1996-2003 809M08050

    Wiseco 80.50mm Piston Kit for Kawasaki 1100 ZXi 1996-2003 809M08050

    WISECO

    $149.95
    If you're running a Kawasaki 1100 ZXi and pushing hard on the track, your factory piston won't cut it. The Wiseco 809M08050 is engineered from high-silicone forged stock to deliver the strength, thermal stability, and precision clearances that serious...
    809M08050
    SKU:
    809M08050
    Availability:
    Ships Same Business Day
    Weight:
    1.10 LBS
    BORE - OVERSIZE METRIC:
    +0.50 MM
    RIDING STYLE:
    WATERCRAFT
    BORE - OVERSIZE:
    +0,50 MM
    DISPLACEMENT:
    1083 CC
    DISPLACEMENT:
    752 CC
    PISTON MATERIAL:
    ALUMINUM
    PRODUCT NAME:
    PISTON
    BORE SIZE METRIC:
    80.50 MM
    UNITS:
    EACH
    $149.95
    Qty in Cart: 0
    Quantity:
    Price:
    $149.95
    Subtotal:
  • Wiseco Piston Kit 95mm 11.8:1 Compression KTM 450 XC-F 2012-2016 PK1901

    Wiseco Piston Kit 95mm 11.8:1 Compression KTM 450 XC-F 2012-2016 PK1901

    WISECO

    $369.95
    When your KTM 450 XC-F demands a complete top-end rebuild, the Wiseco Piston Kit PK1901 delivers the precision engineering and durability required for consistent high-RPM performance. High-silicone forged construction minimizes thermal expansion and...
    09031145
    SKU:
    09031145
    Availability:
    Ships Same Business Day
    Weight:
    1.76 LBS
    BORE SIZE METRIC:
    95.00 MM
    PISTON MATERIAL:
    2618 ALUMINUM ALLOY
    PRODUCT NAME:
    REBUILD KIT
    STROKE LENGTH METRIC:
    63.40 MM
    TYPE:
    TOP END
    DISPLACEMENT:
    449 CC
    PISTON DIAMETER METRIC:
    94.95 MM
    RIDING STYLE:
    STREET
    SKIRT COATING:
    ARMORGLIDE®
    BORE - OVERSIZE METRIC:
    STANDARD
    ENGINE TYPE:
    4-STROKE
    MODEL:
    FORGED SERIES
    BORE - OVERSIZE:
    STANDARD
    COMPRESSION RATIO IMPERIAL:
    11.8:1
    RIDING STYLE:
    OFF-ROAD
    UNITS:
    KIT
    Qty in Cart: 0
    Quantity:
    Price:
    $369.95
    Subtotal:
  • Wiseco Piston Kit with Gasket for Kawasaki KX85 2014-2023 PK1904

    Wiseco Piston Kit with Gasket for Kawasaki KX85 2014-2023 PK1904

    WISECO

    $186.95
    A quality piston kit is the foundation of any reliable 2-cycle build—it directly impacts combustion efficiency, engine longevity, and overall performance. The Wiseco PK1904 delivers OEM-grade precision with forged durability, meaning your KX85 will...
    09031148
    SKU:
    09031148
    Availability:
    Ships Same Business Day
    Weight:
    0.80 LBS
    BORE - OVERSIZE:
    STANDARD
    BORE - OVERSIZE METRIC:
    STANDARD
    DISPLACEMENT:
    84.9 CC
    ENGINE TYPE:
    2-STROKE
    PRODUCT NAME:
    REBUILD KIT
    PISTON DIAMETER METRIC:
    48.45 MM
    PISTON MATERIAL:
    4032 ALUMINUM ALLOY
    RIDING STYLE:
    OFF-ROAD
    STROKE LENGTH METRIC:
    45.80 MM
    UNITS:
    KIT
    BORE SIZE METRIC:
    48.50 MM
    MODEL:
    PRO-LITE
    SKIRT COATING:
    NON-COATED
    TYPE:
    TOP END
    Qty in Cart: 0
    Quantity:
    Price:
    $186.95
    Subtotal:
  • Wiseco Piston Kit with Gasket for Kawasaki KX85 2014-2020 PK1905

    Wiseco Piston Kit with Gasket for Kawasaki KX85 2014-2020 PK1905

    WISECO

    $186.95
    A top-end rebuild demands precision components that won't fail under sustained high RPM and heat stress. The Wiseco Piston Kit delivers the durability and thermal stability your KX85 needs to maintain consistent power delivery and reliability through...
    09031149
    SKU:
    09031149
    Availability:
    Ships Same Business Day
    Weight:
    0.80 LBS
    BORE - OVERSIZE:
    +0,50 MM
    PISTON MATERIAL:
    4032 ALUMINUM ALLOY
    RIDING STYLE:
    OFF-ROAD
    STROKE LENGTH METRIC:
    45.80 MM
    UNITS:
    KIT
    PRODUCT NAME:
    REBUILD KIT
    BORE SIZE METRIC:
    49.00 MM
    ENGINE TYPE:
    2-STROKE
    PISTON DIAMETER METRIC:
    48.95 MM
    BORE - OVERSIZE METRIC:
    +0.50 MM
    DISPLACEMENT:
    84.9 CC
    MODEL:
    PRO-LITE
    SKIRT COATING:
    NON-COATED
    TYPE:
    TOP END
    Qty in Cart: 0
    Quantity:
    Price:
    $186.95
    Subtotal:
  • Wiseco Top End Bearing 12x16x15.8 Kawasaki KFX50 2003-2009 B1000

    Wiseco Top End Bearing 12x16x15.8 Kawasaki KFX50 2003-2009 B1000

    WISECO

    $25.95
    The Wiseco B1000 top end bearing delivers the precision fit and durability your KFX50 needs to handle consistent high-RPM performance. Factory OEM bearings wear quickly under aggressive riding or racing conditions—this replacement maintains the tight...
    B1000
    SKU:
    B1000
    Availability:
    Ships Same Business Day
    Weight:
    0.38 LBS
    APPLICATION:
    PISTON
    INSIDE DIAMETER METRIC:
    12 MM
    MATERIAL:
    SILICONE
    RIDING STYLE:
    OFF-ROAD
    MATERIAL:
    ALUMINUM
    LENGTH METRIC:
    15.8 MM
    OUTSIDE DIAMETER METRIC:
    16 MM
    PRODUCT NAME:
    BEARING
    RIDING STYLE:
    ATV
    TYPE:
    TOP END
    UNITS:
    EACH
    $25.95
    Qty in Cart: 0
    Quantity:
    Price:
    $25.95
    Subtotal:
  • Total: items /

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Dirt Bike Engine Parts

Keep your dirt bike running smoothly and prolong the life of its engine with essential general maintenance. But when parts start to break down, don't let it stop you from getting out on the trails! JJ Motorsports has all that you need for minor jobs like oil changes or major overhauls such as a complete rebuild - carrying top aftermarket brands . Get back in gear faster by shopping our full line of high-quality dirt bike engine parts here today at JJ Motorsports!

 

At JJ Motorsports, we want to make sure you don't miss out on the ride! If your motor has blown or radiator smashed, our gearheads can help get you back in the seat. We carry piston kits from top brands like Wiseco and Wrench Rabbit engine kits so that riders have access to a wide range of parts for their dirt bike engine rebuilds. Plus – with gaskets at-the-ready when it comes time for any leakages - no need to worry about maintenance issues either; simply stay up on oil & filter changes and let us take care of everything else. Got queries? Just give one of our knowledgeable staff members a call at 1-231‐767‐5055 where they'll be more than happy provide advice, instructions and tailored answers catered just for YOU!

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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