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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 Piston Kit 76mm 12.8:1 Compression for 2006-2012 KTM 250 SX-F 4981M07600

    Wiseco Piston Kit 76mm 12.8:1 Compression for 2006-2012 KTM 250 SX-F 4981M07600

    WISECO

    MSRP: $244.95
    Now: $208.00
    Was: $244.95
    Wiseco 4981M07600 Piston Kit Transform your motorcycle's performance with the Wiseco 4981M07600 Piston Kit. Designed for enthusiasts who demand peak efficiency and power, this piston kit enhances your 4-stroke engine's capabilities, ensuring a thrilling...
    09100846
    SKU:
    09100846
    Availability:
    Ships Same Business Day
    Weight:
    0.57 LBS
    BORE SIZE METRIC:
    76.00 MM
    RIDING STYLE:
    STREET
    DISPLACEMENT:
    249,5 CC
    SKIRT COATING:
    MOLY COATED
    BORE - OVERSIZE METRIC:
    STANDARD
    COMPRESSION RATIO IMPERIAL:
    12.8:1
    PISTON MATERIAL:
    FORGED
    PRODUCT NAME:
    PISTON
    RIDING STYLE:
    OFF-ROAD
    BORE - OVERSIZE:
    STANDARD
    ENGINE TYPE:
    4-STROKE
    PISTON MATERIAL:
    ALUMINUM ALLOY
    UNITS:
    EACH
    MSRP: $244.95
    Now: $208.00
    Was: $244.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $244.95
    Now: $208.00
    Was: $244.95
    Subtotal:
  • On Sale
    Wiseco Honda CR85R 2003-2007 Piston Kit with Gaskets 48.50mm PK1216

    Wiseco Honda CR85R 2003-2007 Piston Kit with Gaskets 48.50mm PK1216

    WISECO

    MSRP: $169.95
    Now: $144.00
    Was: $169.95
    Wiseco PK1216 Top-End Rebuild Kit Transform your 2-stroke engine's performance with the Wiseco PK1216 Top-End Rebuild Kit. Crafted for riders who seek peak efficiency and reliability, this kit combines advanced engineering with high-quality materials to...
    09030545
    SKU:
    09030545
    Availability:
    Ships Same Business Day
    Weight:
    0.60 LBS
    BORE SIZE METRIC:
    48.50 MM
    PISTON MATERIAL:
    4032 ALUMINUM ALLOY
    RIDING STYLE:
    OFF-ROAD
    TYPE:
    TOP END
    ENGINE TYPE:
    2-STROKE
    MODEL:
    PRO-LITE
    PRODUCT NAME:
    REBUILD KIT
    BORE - OVERSIZE METRIC:
    +1.00 MM
    SKIRT COATING:
    NON-COATED
    STROKE LENGTH METRIC:
    47.80 MM
    UNITS:
    KIT
    BORE - OVERSIZE:
    +1,00 MM
    DISPLACEMENT:
    84.7 CC
    PISTON DIAMETER METRIC:
    48.45 MM
    MSRP: $169.95
    Now: $144.00
    Was: $169.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $169.95
    Now: $144.00
    Was: $169.95
    Subtotal:
  • On Sale
    Wiseco Piston Kit 78mm 13.5:1 Honda CRF250R 2004-2007 CRF250X 2004-2017 PK1240

    Wiseco Piston Kit 78mm 13.5:1 Honda CRF250R 2004-2007 CRF250X 2004-2017 PK1240

    WISECO

    MSRP: $354.95
    Now: $302.00
    Was: $354.95
    Wiseco PK1240 Top-End Rebuild Kit Unlock the true potential of your high-performance motorcycle with the Wiseco PK1240 Top-End Rebuild Kit. Designed for enthusiasts and racers alike, this kit combines precision engineering with top-quality materials to...
    09030551
    SKU:
    09030551
    Availability:
    Ships Same Business Day
    Weight:
    1.05 LBS
    DISPLACEMENT:
    249 CC
    BORE SIZE METRIC:
    78.00 MM
    PRODUCT NAME:
    REBUILD KIT
    BORE - OVERSIZE:
    STANDARD
    BORE - OVERSIZE METRIC:
    STANDARD
    COMPRESSION RATIO IMPERIAL:
    13.5:1
    MODEL:
    FORGED SERIES
    SKIRT COATING:
    ARMORGLIDE®
    STROKE LENGTH METRIC:
    52.20 MM
    UNITS:
    KIT
    ENGINE TYPE:
    4-STROKE
    PISTON DIAMETER METRIC:
    77.95 MM
    PISTON MATERIAL:
    2618 ALUMINUM ALLOY
    RIDING STYLE:
    OFF-ROAD
    TYPE:
    TOP END
    MSRP: $354.95
    Now: $302.00
    Was: $354.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $354.95
    Now: $302.00
    Was: $354.95
    Subtotal:
  • On Sale
    Wiseco Piston Kit Honda CR125R 2004-2007 54mm 841M05400

    Wiseco Piston Kit Honda CR125R 2004-2007 54mm 841M05400

    WISECO

    MSRP: $174.95
    Now: $149.00
    Was: $174.95
    Wiseco 841M05400 GP Series Piston Kit Transform your riding experience with the Wiseco 841M05400 GP Series Piston Kit. Engineered for performance enthusiasts, this piston kit is designed to enhance your bike's power and reliability, making it the perfect...
    09100731
    SKU:
    09100731
    Availability:
    Ships Same Business Day
    Weight:
    0.41 LBS
    BORE - OVERSIZE:
    STANDARD
    BORE SIZE METRIC:
    54.00 MM
    UNITS:
    EACH
    DISPLACEMENT:
    125 CC
    ENGINE TYPE:
    2-STROKE
    MODEL:
    GP STYLE
    BORE - OVERSIZE METRIC:
    STANDARD
    PISTON MATERIAL:
    ALUMINUM
    PISTON MATERIAL:
    FORGED
    RIDING STYLE:
    OFF-ROAD
    PRODUCT NAME:
    PISTON KIT
    STROKE LENGTH METRIC:
    54.50 MM
    MSRP: $174.95
    Now: $149.00
    Was: $174.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $174.95
    Now: $149.00
    Was: $174.95
    Subtotal:
  • On Sale
    Wiseco Piston Kit with Gaskets for Kawasaki KX450F 2006-2008 PK1403

    Wiseco Piston Kit with Gaskets for Kawasaki KX450F 2006-2008 PK1403

    WISECO

    MSRP: $319.95
    Now: $272.00
    Was: $319.95
    Wiseco PK1403 Top End Piston Kit Elevate your 4-stroke Kawasaki's performance with the Wiseco PK1403 Top End Piston Kit. Designed for serious riders, this kit combines cutting-edge engineering with robust materials to unlock your motorcycle's true...
    09030575
    SKU:
    09030575
    Availability:
    Ships Same Business Day
    Weight:
    1.70 LBS
    BORE - OVERSIZE METRIC:
    STANDARD
    BORE SIZE METRIC:
    96.00 MM
    DISPLACEMENT:
    449 CC
    PISTON DIAMETER METRIC:
    STANDARD
    SKIRT COATING:
    ARMORGLIDE®
    BORE - OVERSIZE:
    STANDARD
    COMPRESSION RATIO IMPERIAL:
    12.0:1
    ENGINE TYPE:
    4-STROKE
    MODEL:
    FORGED SERIES
    PISTON MATERIAL:
    2618 ALUMINUM ALLOY
    PRODUCT NAME:
    REBUILD KIT
    RIDING STYLE:
    OFF-ROAD
    STROKE LENGTH METRIC:
    62.10 MM
    TYPE:
    TOP END
    UNITS:
    KIT
    MSRP: $319.95
    Now: $272.00
    Was: $319.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $319.95
    Now: $272.00
    Was: $319.95
    Subtotal:
  • On Sale
    Wiseco Piston Kit 96mm 13:1 Kawasaki KX450F 2006-2008 PK1405

    Wiseco Piston Kit 96mm 13:1 Kawasaki KX450F 2006-2008 PK1405

    WISECO

    MSRP: $349.95
    Now: $297.00
    Was: $349.95
    Wiseco PK1405 Top End Piston Kit Unleash your motorcycle's full potential with the Wiseco PK1405 Top End Piston Kit. Designed specifically for 4-stroke Kawasaki models, this kit enhances engine performance, ensuring you achieve optimal power and...
    09030576
    SKU:
    09030576
    Availability:
    Ships Same Business Day
    Weight:
    1.65 LBS
    MODEL:
    FORGED SERIES
    STROKE LENGTH METRIC:
    62.10 MM
    BORE SIZE METRIC:
    96.00 MM
    ENGINE TYPE:
    4-STROKE
    TYPE:
    TOP END
    COMPRESSION RATIO IMPERIAL:
    13.0:1
    DISPLACEMENT:
    449 CC
    PISTON DIAMETER METRIC:
    STANDARD
    PISTON MATERIAL:
    2618 ALUMINUM ALLOY
    RIDING STYLE:
    OFF-ROAD
    SKIRT COATING:
    ARMORGLIDE®
    UNITS:
    KIT
    BORE - OVERSIZE:
    STANDARD
    BORE - OVERSIZE METRIC:
    STANDARD
    PRODUCT NAME:
    REBUILD KIT
    MSRP: $349.95
    Now: $297.00
    Was: $349.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $349.95
    Now: $297.00
    Was: $349.95
    Subtotal:
  • On Sale
    Wiseco Piston Kit Standard Kawasaki KX85 2001-2013 862M04850

    Wiseco Piston Kit Standard Kawasaki KX85 2001-2013 862M04850

    WISECO

    MSRP: $134.95
    Now: $115.00
    Was: $134.95
    Wiseco 862M04850 Pro-Lite Piston Kit Elevate your 2-stroke performance with the Wiseco 862M04850 Pro-Lite Piston Kit, designed for the discerning rider seeking unmatched power and reliability. This precision-engineered kit is the ultimate upgrade for...
    09100762
    SKU:
    09100762
    Availability:
    Ships Same Business Day
    Weight:
    0.30 LBS
    BORE - OVERSIZE:
    STANDARD
    BORE - OVERSIZE METRIC:
    STANDARD
    PISTON MATERIAL:
    ALUMINUM ALLOY
    PRODUCT NAME:
    PISTON
    BORE SIZE METRIC:
    48.50 MM
    PISTON MATERIAL:
    FORGED
    RIDING STYLE:
    OFF-ROAD
    DISPLACEMENT:
    84,9 CC
    ENGINE TYPE:
    2-STROKE
    UNITS:
    EACH
    STROKE LENGTH METRIC:
    45.80 MM
    MSRP: $134.95
    Now: $115.00
    Was: $134.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $134.95
    Now: $115.00
    Was: $134.95
    Subtotal:
  • On Sale
    Wiseco Piston Kit for Yamaha YZ125 2005-2021 846M05600

    Wiseco Piston Kit for Yamaha YZ125 2005-2021 846M05600

    WISECO

    MSRP: $184.95
    Now: $157.00
    Was: $184.95
    Wiseco 846M05600 Pro-Lite Piston Kit Elevate your 2-stroke engine's performance with the Wiseco 846M05600 Pro-Lite Piston Kit. Engineered for extreme reliability and power, this kit is the ideal choice for riders who demand the best from their machines...
    09100800
    SKU:
    09100800
    Availability:
    Ships Same Business Day
    Weight:
    0.47 LBS
    BORE SIZE METRIC:
    56.00 MM
    PISTON MATERIAL:
    ALUMINUM ALLOY
    UNITS:
    EACH
    BORE - OVERSIZE METRIC:
    +2.00 MM
    ENGINE TYPE:
    2-STROKE
    MODEL:
    GP STYLE
    BORE - OVERSIZE:
    +2,00 MM
    PISTON MATERIAL:
    FORGED
    PRODUCT NAME:
    PISTON
    RIDING STYLE:
    OFF-ROAD
    DISPLACEMENT:
    134 CC
    STROKE LENGTH METRIC:
    54.50 MM
    MSRP: $184.95
    Now: $157.00
    Was: $184.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $184.95
    Now: $157.00
    Was: $184.95
    Subtotal:
  • On Sale
    Wiseco Piston Kit Suzuki RM80 1991-2001 645M04900

    Wiseco Piston Kit Suzuki RM80 1991-2001 645M04900

    WISECO

    MSRP: $144.95
    Now: $123.00
    Was: $144.95
    Wiseco 645M04900 Pro-Lite Piston Kit Elevate your 2-stroke engine's performance with the Wiseco 645M04900 Pro-Lite Piston Kit. This premium kit is engineered for riders who seek unmatched reliability and power, ensuring your engine operates at its peak...
    09101222
    SKU:
    09101222
    Availability:
    Ships Same Business Day
    Weight:
    0.40 LBS
    BORE - OVERSIZE:
    +1,50 MM
    PISTON MATERIAL:
    ALUMINUM ALLOY
    STROKE LENGTH METRIC:
    46.80 MM
    UNITS:
    EACH
    BORE SIZE METRIC:
    49.00 MM
    DISPLACEMENT:
    82 CC
    ENGINE TYPE:
    2-STROKE
    MODEL:
    PRO-LITE
    PISTON MATERIAL:
    FORGED
    PRODUCT NAME:
    PISTON
    RIDING STYLE:
    OFF-ROAD
    BORE - OVERSIZE METRIC:
    +1.50 MM
    MSRP: $144.95
    Now: $123.00
    Was: $144.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $144.95
    Now: $123.00
    Was: $144.95
    Subtotal:
  • On Sale
    Wiseco Piston Kit Yamaha YZ125 1994-1996 647M05600

    Wiseco Piston Kit Yamaha YZ125 1994-1996 647M05600

    WISECO

    MSRP: $179.95
    Now: $153.00
    Was: $179.95
    Wiseco 647M05600 Pro-Lite Piston Kit Elevate your 2-stroke engine's performance with the Wiseco 647M05600 Pro-Lite Piston Kit, crafted for enthusiasts who demand the best in durability and power. This kit is engineered with cutting-edge technology to...
    09101224
    SKU:
    09101224
    Availability:
    Ships Same Business Day
    Weight:
    0.50 LBS
    BORE - OVERSIZE METRIC:
    +2.00 MM
    DISPLACEMENT:
    124 CC
    ENGINE TYPE:
    2-STROKE
    MODEL:
    PRO-LITE
    RIDING STYLE:
    ATV
    UNITS:
    EACH
    BORE - OVERSIZE:
    +2,00 MM
    BORE SIZE METRIC:
    56.00 MM
    PISTON MATERIAL:
    ALUMINUM ALLOY
    PRODUCT NAME:
    PISTON
    PISTON MATERIAL:
    FORGED
    STROKE LENGTH METRIC:
    54.50 MM
    MSRP: $179.95
    Now: $153.00
    Was: $179.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $179.95
    Now: $153.00
    Was: $179.95
    Subtotal:
  • On Sale
    Wiseco 47mm Piston Kit for KTM 65 SX 1999-2008 PK1515

    Wiseco 47mm Piston Kit for KTM 65 SX 1999-2008 PK1515

    WISECO

    MSRP: $189.95
    Now: $161.00
    Was: $189.95
    Wiseco PK1515 Top End Kit Unlock the full potential of your KTM with the Wiseco PK1515 Top End Kit, engineered for riders who demand peak performance and reliability. This comprehensive kit enhances your 2-stroke engine's efficiency, making it perfect...
    09030702
    SKU:
    09030702
    Availability:
    Ships Same Business Day
    Weight:
    0.75 LBS
    PISTON MATERIAL:
    4032 ALUMINUM ALLOY
    RIDING STYLE:
    OFF-ROAD
    STROKE LENGTH METRIC:
    40.00 MM
    UNITS:
    KIT
    DISPLACEMENT:
    63.58 CC
    PISTON DIAMETER METRIC:
    46.95 MM
    SKIRT COATING:
    NON-COATED
    BORE - OVERSIZE METRIC:
    +2.00 MM
    BORE SIZE METRIC:
    47.00 MM
    ENGINE TYPE:
    2-STROKE
    MODEL:
    PRO-LITE
    TYPE:
    TOP END
    BORE - OVERSIZE:
    +2,00 MM
    PISTON SIZE METRIC:
    +2.00 MM
    PRODUCT NAME:
    REBUILD KIT
    MSRP: $189.95
    Now: $161.00
    Was: $189.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $189.95
    Now: $161.00
    Was: $189.95
    Subtotal:
  • On Sale
    Wiseco Suzuki RM80 1991-2001 49.5mm Piston Kit with Gaskets PK1528

    Wiseco Suzuki RM80 1991-2001 49.5mm Piston Kit with Gaskets PK1528

    WISECO

    MSRP: $189.95
    Now: $161.00
    Was: $189.95
    Wiseco PK1528 Top End Kit Elevate your 2-stroke engine's performance with the Wiseco PK1528 Top End Kit. Designed for enthusiasts who prioritize power and reliability, this kit combines cutting-edge engineering with premium materials to enhance your...
    09030710
    SKU:
    09030710
    Availability:
    Ships Same Business Day
    Weight:
    0.80 LBS
    PISTON MATERIAL:
    4032 ALUMINUM ALLOY
    RIDING STYLE:
    OFF-ROAD
    PISTON SIZE METRIC:
    +2.00 MM
    PRODUCT NAME:
    REBUILD KIT
    BORE - OVERSIZE:
    +2,00 MM
    ENGINE TYPE:
    2-STROKE
    STROKE LENGTH METRIC:
    46.80 MM
    TYPE:
    TOP END
    BORE - OVERSIZE METRIC:
    +2.00 MM
    BORE SIZE METRIC:
    49.50 MM
    DISPLACEMENT:
    82 CC
    MODEL:
    PRO-LITE
    PISTON DIAMETER METRIC:
    49.45 MM
    SKIRT COATING:
    NON-COATED
    UNITS:
    KIT
    MSRP: $189.95
    Now: $161.00
    Was: $189.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $189.95
    Now: $161.00
    Was: $189.95
    Subtotal:
  • On Sale
    Wiseco Piston Kit Suzuki RM250 2003-2008 823M06750

    Wiseco Piston Kit Suzuki RM250 2003-2008 823M06750

    WISECO

    MSRP: $118.95
    Now: $101.00
    Was: $118.95
    Wiseco 823M06750 Piston Kit Unlock the full potential of your 2-stroke engine with the Wiseco 823M06750 Piston Kit. Designed for enthusiasts who demand high performance, this kit delivers exceptional power and reliability, making it ideal for both...
    09101251
    SKU:
    09101251
    Availability:
    Ships Same Business Day
    Weight:
    0.75 LBS
    BORE - OVERSIZE METRIC:
    +1.10 MM
    PISTON MATERIAL:
    ALUMINUM ALLOY
    UNITS:
    EACH
    BORE SIZE METRIC:
    67.50 MM
    DISPLACEMENT:
    249 CC
    ENGINE TYPE:
    2-STROKE
    BORE - OVERSIZE:
    +1,10 MM
    PISTON MATERIAL:
    FORGED
    PRODUCT NAME:
    PISTON
    RIDING STYLE:
    OFF-ROAD
    STROKE LENGTH METRIC:
    72.00 MM
    MSRP: $118.95
    Now: $101.00
    Was: $118.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $118.95
    Now: $101.00
    Was: $118.95
    Subtotal:
  • On Sale
    Wiseco Piston Kit 45.00mm 2.00mm Oversize Kawasaki KX60 1983-2003 648M04500

    Wiseco Piston Kit 45.00mm 2.00mm Oversize Kawasaki KX60 1983-2003 648M04500

    WISECO

    MSRP: $134.95
    Now: $115.00
    Was: $134.95
    Wiseco 648M04500 Pro-Lite Piston Kit Elevate your 2-stroke engine's performance with the Wiseco 648M04500 Pro-Lite Piston Kit. Designed for serious riders, this kit combines cutting-edge technology with high-quality materials to ensure optimal...
    09100344
    SKU:
    09100344
    Availability:
    Ships Same Business Day
    Weight:
    0.35 LBS
    BORE - OVERSIZE METRIC:
    +2.00 MM
    ENGINE TYPE:
    2-STROKE
    RIDING STYLE:
    OFF-ROAD
    DISPLACEMENT:
    60 CC
    PISTON MATERIAL:
    ALUMINUM ALLOY
    UNITS:
    EACH
    BORE - OVERSIZE:
    +2,00 MM
    BORE SIZE METRIC:
    45.00 MM
    PISTON MATERIAL:
    FORGED
    PRODUCT NAME:
    PISTON
    STROKE LENGTH METRIC:
    41.60 MM
    MSRP: $134.95
    Now: $115.00
    Was: $134.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $134.95
    Now: $115.00
    Was: $134.95
    Subtotal:
  • On Sale
    Wiseco Piston Kit 54mm for Suzuki RM125 2004-2007 835M05400

    Wiseco Piston Kit 54mm for Suzuki RM125 2004-2007 835M05400

    WISECO

    MSRP: $144.95
    Now: $123.00
    Was: $144.95
    Wiseco 835M05400 Pro-Lite Piston Kit Elevate your 2-stroke engine performance with the Wiseco 835M05400 Pro-Lite Piston Kit. Engineered for those who demand excellence, this piston kit combines innovative technology with meticulous craftsmanship,...
    09100357
    SKU:
    09100357
    Availability:
    Ships Same Business Day
    Weight:
    0.40 LBS
    BORE - OVERSIZE METRIC:
    STANDARD
    DISPLACEMENT:
    125 CC
    PISTON MATERIAL:
    FORGED
    PRODUCT NAME:
    PISTON
    BORE - OVERSIZE:
    STANDARD
    BORE SIZE METRIC:
    54.00 MM
    PISTON MATERIAL:
    ALUMINUM ALLOY
    UNITS:
    EACH
    STROKE LENGTH METRIC:
    54.50 MM
    ENGINE TYPE:
    2-STROKE
    MODEL:
    PRO-LITE
    RIDING STYLE:
    OFF-ROAD
    MSRP: $144.95
    Now: $123.00
    Was: $144.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $144.95
    Now: $123.00
    Was: $144.95
    Subtotal:
  • On Sale
    Wiseco KX250 1993-2001 Piston Kit 68.50mm PK1291

    Wiseco KX250 1993-2001 Piston Kit 68.50mm PK1291

    WISECO

    MSRP: $294.95
    Now: $251.00
    Was: $294.95
    Wiseco PK1291 Top End Kit Unleash the full potential of your Kawasaki KX250 with the Wiseco PK1291 Top End Kit. Crafted for performance enthusiasts, this kit enhances engine responsiveness and power, ensuring your ride excels both on the track and off...
    09030547
    SKU:
    09030547
    Availability:
    Ships Same Business Day
    Weight:
    1.20 LBS
    BORE - OVERSIZE:
    +2,10 MM
    SKIRT COATING:
    NON-COATED
    STROKE LENGTH METRIC:
    72.00 MM
    BORE - OVERSIZE METRIC:
    +2.10 MM
    PISTON DIAMETER METRIC:
    68.45 MM
    PISTON MATERIAL:
    4032 ALUMINUM ALLOY
    RIDING STYLE:
    OFF-ROAD
    UNITS:
    KIT
    DISPLACEMENT:
    249 CC
    ENGINE TYPE:
    2-STROKE
    MODEL:
    PRO-LITE
    TYPE:
    TOP END
    BORE SIZE METRIC:
    68.50 MM
    PRODUCT NAME:
    REBUILD KIT
    MSRP: $294.95
    Now: $251.00
    Was: $294.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $294.95
    Now: $251.00
    Was: $294.95
    Subtotal:
  • On Sale
    Wiseco Yamaha YZ250F 2001-2004 Piston Kit with Gaskets PK1241

    Wiseco Yamaha YZ250F 2001-2004 Piston Kit with Gaskets PK1241

    WISECO

    MSRP: $294.95
    Now: $251.00
    Was: $294.95
    Wiseco PK1241 Top End Kit Elevate your riding experience with the Wiseco PK1241 Top End Kit, meticulously engineered for optimal performance and reliability. Designed for serious riders, this kit enhances engine efficiency and power output, ensuring you...
    09030554
    SKU:
    09030554
    Availability:
    Ships Same Business Day
    Weight:
    0.80 LBS
    BORE - OVERSIZE:
    STANDARD
    BORE - OVERSIZE METRIC:
    STANDARD
    COMPRESSION RATIO IMPERIAL:
    12.7:1
    DISPLACEMENT:
    249 CC
    PISTON DIAMETER METRIC:
    76.95 MM
    PRODUCT NAME:
    REBUILD KIT
    BORE SIZE METRIC:
    77.00 MM
    ENGINE TYPE:
    4-STROKE
    MODEL:
    FORGED SERIES
    STROKE LENGTH METRIC:
    53.60 MM
    TYPE:
    TOP END
    PISTON MATERIAL:
    2618 ALUMINUM ALLOY
    RIDING STYLE:
    OFF-ROAD
    SKIRT COATING:
    NON-COATED
    UNITS:
    KIT
    MSRP: $294.95
    Now: $251.00
    Was: $294.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $294.95
    Now: $251.00
    Was: $294.95
    Subtotal:
  • On Sale
    Wiseco Piston Kit 77mm 14.1:1 for 2004-2005 Kawasaki KX250F PK1239

    Wiseco Piston Kit 77mm 14.1:1 for 2004-2005 Kawasaki KX250F PK1239

    WISECO

    MSRP: $339.95
    Now: $289.00
    Was: $339.95
    Wiseco PK1239 Top End Kit Elevate your motorcycle's performance with the Wiseco PK1239 Top End Kit, meticulously engineered for those who seek unmatched power and reliability. This premium kit is perfect for competitive riders and trail enthusiasts...
    09030556
    SKU:
    09030556
    Availability:
    Ships Same Business Day
    Weight:
    1.35 LBS
    COMPRESSION RATIO IMPERIAL:
    14.1:1
    BORE - OVERSIZE:
    STANDARD
    BORE - OVERSIZE METRIC:
    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
    PISTON MATERIAL:
    2618 ALUMINUM ALLOY
    PRODUCT NAME:
    REBUILD KIT
    PISTON DIAMETER METRIC:
    76.96 MM
    RIDING STYLE:
    OFF-ROAD
    TYPE:
    TOP END
    UNITS:
    KIT
    MSRP: $339.95
    Now: $289.00
    Was: $339.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $339.95
    Now: $289.00
    Was: $339.95
    Subtotal:
  • On Sale
    Wiseco Piston Kit Kawasaki GPz1100 1981-1985 1.089L 0.050 WK1247

    Wiseco Piston Kit Kawasaki GPz1100 1981-1985 1.089L 0.050 WK1247

    WISECO

    MSRP: $574.95
    Now: $489.00
    Was: $574.95
    Wiseco WK1247 2-Stroke Watercraft Piston Kit Transform your Kawasaki watercraft's performance with the Wiseco WK1247 2-Stroke Piston Kit. Engineered for enthusiasts who demand the best, this kit combines cutting-edge technology with superior...
    WK1247
    SKU:
    WK1247
    Availability:
    Ships Same Business Day
    Weight:
    3.81 LBS
    ENGINE TYPE:
    2-STROKE
    PISTON MATERIAL:
    4032 ALUMINUM ALLOY
    BORE - OVERSIZE:
    +0,50 MM
    SKIRT COATING:
    NON-COATED
    BORE - OVERSIZE METRIC:
    +0.50 MM
    BORE SIZE METRIC:
    80.50 MM
    PISTON DIAMETER METRIC:
    80.39 MM
    PRODUCT NAME:
    REBUILD KIT
    TYPE:
    TOP END
    DISPLACEMENT:
    1083 CC
    MODEL:
    FORGED SERIES
    RIDING STYLE:
    WATERCRAFT
    UNITS:
    KIT
    MSRP: $574.95
    Now: $489.00
    Was: $574.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $574.95
    Now: $489.00
    Was: $574.95
    Subtotal:
  • WORKS CONNECTION Engine Timing Plug - Blue - Yamaha 24-550

    WORKS CONNECTION Engine Timing Plug - Blue - Yamaha 24-550

    WORKS CONNECTION

    $32.95
    Precision-machined from 6061 T-6 aluminum, Simple positive installation with an Allen wrench, Set of two plugs replaces the stock plugs, Polished to a mirror finish prior to anodizing, resulting in a brilliant look, Anodized finish, Made in the U.S.A.
    09500102
    SKU:
    09500102
    Availability:
    Ships Same Business Day
    Weight:
    0.20 LBS
    COLOR/FINISH:
    ANODIZED
    COLOR/FINISH:
    BLUE
    PRODUCT NAME:
    PLUG
    RIDING STYLE:
    ATV
    RIDING STYLE:
    OFF-ROAD
    MATERIAL:
    6061 T-6 ALUMINUM
    TYPE:
    ENGINE
    UNITS:
    SET
    Qty in Cart: 0
    Quantity:
    Price:
    $32.95
    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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