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Harley Engine

Harley Engine

Harley Engine

Harley Bike Engine Parts at JJ Motorsports

Rebuild and boost your Harley's engine with premium parts from JJ Motorsports. Our inventory features complete gasket sets, piston kits, oil filters, pushrod tubes, and coolers designed for maximum strength, leak-free sealing, and high-performance in extreme conditions. Compatible with Big Twins, Softail, Touring, and more, these components support top-end overhauls, oil management, and durability for street rides or custom builds.

Shop trusted brands like Drag Specialties for magnetic filters and Wiseco for forged pistons. Explore related categories such as Harley air and fuel for carb tuning or Harley drivetrain for transmission upgrades.

Top Harley Engine Products

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
  • Hastings HASTINGS Piston Rings 2M5721

    Hastings HASTINGS Piston Rings 2M5721

    HASTINGS

    $44.17
    Piston rings are critical to engine sealing and compression—worn or substandard rings lead to blow-by, oil consumption, and power loss. The Hastings 2M5721 delivers OEM-quality construction with...
    DS750861
    SKU:
    DS750861
    Availability:
    Ships Same Business Day
    Weight:
    0.19 LBS
    RIDING STYLE:
    STREET
    BORE - OVERSIZE:
    STANDARD
    BORE OVERSIZE - IMPERIAL:
    STANDARD
    RING MATERIAL:
    MOLY COATED
    UNITS:
    SET
    BORE SIZE IMPERIAL:
    3.625'
    PRODUCT NAME:
    PISTON RING
    STYLE:
    PERFORMANCE REPLACEMENT
    $44.17
    Qty in Cart: 0
    Quantity:
    Price:
    $44.17
    Subtotal:
  • Hastings HASTINGS Piston Rings - Evolution 2M6198

    Hastings HASTINGS Piston Rings - Evolution 2M6198

    HASTINGS

    $37.41
    Piston rings are critical to engine sealing and performance—inadequate ring quality leads to blow-by, loss of compression, and accelerated wear. Hastings Evolution 2M6198 rings deliver the precision...
    DS750850
    SKU:
    DS750850
    Availability:
    Ships Same Business Day
    Weight:
    0.13 LBS
    PRODUCT NAME:
    PISTON RING
    RING MATERIAL:
    MOLY COATED
    STYLE:
    OEM REPLACEMENT
    BORE - OVERSIZE:
    STANDARD
    BORE OVERSIZE - IMPERIAL:
    STANDARD
    BORE SIZE IMPERIAL:
    3.000'
    RIDING STYLE:
    STREET
    UNITS:
    SET
    $37.41
    Qty in Cart: 0
    Quantity:
    Price:
    $37.41
    Subtotal:
  • Hastings HASTINGS Piston Rings - Evolution 2M6164030

    Hastings HASTINGS Piston Rings - Evolution 2M6164030

    HASTINGS

    $52.52
    Piston rings are the critical seal between your pistons and cylinder walls—and cheap or worn rings will cost you compression, blow-by, and power. Hastings has engineered the Evolution 2M6164030 rings...
    DS750843
    SKU:
    DS750843
    Availability:
    Ships Same Business Day
    Weight:
    0.25 LBS
    BORE - OVERSIZE:
    +0,030'
    PRODUCT NAME:
    PISTON RING
    RING MATERIAL:
    MOLY COATED
    STYLE:
    OEM REPLACEMENT
    BORE OVERSIZE - IMPERIAL:
    +0.030'
    BORE SIZE IMPERIAL:
    3.528'
    UNITS:
    SET
    RIDING STYLE:
    STREET
    $52.52
    Qty in Cart: 0
    Quantity:
    Price:
    $52.52
    Subtotal:
  • Hastings HASTINGS Piston Rings - Evolution 2M6164020

    Hastings HASTINGS Piston Rings - Evolution 2M6164020

    HASTINGS

    $55.21
    Piston rings are the critical seal between your combustion chamber and crankcase—get them wrong, and you're looking at blow-by, oil consumption, and power loss. Hastings' Evolution 2M6164020 rings...
    DS750842
    SKU:
    DS750842
    Availability:
    Ships Same Business Day
    Weight:
    0.25 LBS
    PRODUCT NAME:
    PISTON RING
    STYLE:
    OEM REPLACEMENT
    BORE OVERSIZE - IMPERIAL:
    +0.020'
    UNITS:
    SET
    RIDING STYLE:
    STREET
    BORE - OVERSIZE:
    +0,020'
    BORE SIZE IMPERIAL:
    3.498'
    RING MATERIAL:
    MOLY COATED
    $55.21
    Qty in Cart: 0
    Quantity:
    Price:
    $55.21
    Subtotal:
  • Hastings HASTINGS Piston Rings - Evolution 2M6164010

    Hastings HASTINGS Piston Rings - Evolution 2M6164010

    HASTINGS

    $52.52
    Proper ring design is fundamental to engine longevity and performance—Hastings Evolution piston rings deliver precise compression sealing while minimizing blowby and oil consumption. Whether you're...
    DS750841
    SKU:
    DS750841
    Availability:
    Ships Same Business Day
    Weight:
    0.15 LBS
    PRODUCT NAME:
    PISTON RING
    STYLE:
    OEM REPLACEMENT
    UNITS:
    SET
    BORE - OVERSIZE:
    +0,010'
    RING MATERIAL:
    MOLY COATED
    BORE OVERSIZE - IMPERIAL:
    +0.010'
    BORE SIZE IMPERIAL:
    3.508'
    RIDING STYLE:
    STREET
    $52.52
    Qty in Cart: 0
    Quantity:
    Price:
    $52.52
    Subtotal:
  • Hastings HASTINGS Piston Rings - Evolution 2M6164

    Hastings HASTINGS Piston Rings - Evolution 2M6164

    HASTINGS

    $52.52
    Piston rings are where cylinder pressure meets reliability—and Hastings has engineered the Evolution 2M6164 to deliver both. Whether you're building a high-revving engine or restoring a proven...
    DS750840
    SKU:
    DS750840
    Availability:
    Ships Same Business Day
    Weight:
    0.25 LBS
    BORE - OVERSIZE:
    STANDARD
    BORE OVERSIZE - IMPERIAL:
    STANDARD
    UNITS:
    SET
    RIDING STYLE:
    STREET
    BORE SIZE IMPERIAL:
    3.498'
    RING MATERIAL:
    MOLY COATED
    STYLE:
    OEM REPLACEMENT
    PRODUCT NAME:
    PISTON RING
    $52.52
    Qty in Cart: 0
    Quantity:
    Price:
    $52.52
    Subtotal:
  • Hastings HASTINGS Piston Rings - Shovelhead 2M6127040

    Hastings HASTINGS Piston Rings - Shovelhead 2M6127040

    HASTINGS

    $87.21
    Piston rings are critical to engine sealing, compression, and oil control—worn or substandard rings lead to blow-by, power loss, and accelerated wear on cylinder walls. The Hastings Piston Ring Set...
    DS750834
    SKU:
    DS750834
    Availability:
    Ships Same Business Day
    Weight:
    0.25 LBS
    RIDING STYLE:
    STREET
    RING MATERIAL:
    MOLY COATED
    BORE OVERSIZE - IMPERIAL:
    +0.040'
    BORE SIZE IMPERIAL:
    3.538'
    PRODUCT NAME:
    PISTON RING
    STYLE:
    PERFORMANCE REPLACEMENT
    UNITS:
    SET
    BORE - OVERSIZE:
    +0,040'
    $87.21
    Qty in Cart: 0
    Quantity:
    Price:
    $87.21
    Subtotal:
  • Hastings HASTINGS Piston Rings - Shovelhead 2M6127030

    Hastings HASTINGS Piston Rings - Shovelhead 2M6127030

    HASTINGS

    $87.21
    Proper piston ring sealing is critical to maintaining compression, controlling blow-by, and extending engine life in Shovelhead applications. These Hastings rings deliver the durability and precision...
    DS750833
    SKU:
    DS750833
    Availability:
    Ships Same Business Day
    Weight:
    0.25 LBS
    BORE - OVERSIZE:
    +0,030'
    RIDING STYLE:
    STREET
    BORE SIZE IMPERIAL:
    3.528'
    UNITS:
    SET
    RING MATERIAL:
    MOLY COATED
    BORE OVERSIZE - IMPERIAL:
    +0.030'
    PRODUCT NAME:
    PISTON RING
    STYLE:
    PERFORMANCE REPLACEMENT
    Qty in Cart: 0
    Quantity:
    Price:
    $87.21
    Subtotal:
  • Hastings HASTINGS Piston Rings - Shovelhead 2M6127020

    Hastings HASTINGS Piston Rings - Shovelhead 2M6127020

    HASTINGS

    $87.21
    Piston rings are critical to engine seal integrity, compression, and oil control—worn or improper rings will cause blow-by, power loss, and accelerated wear on cylinder walls. Hastings piston rings...
    DS750832
    SKU:
    DS750832
    Availability:
    Ships Same Business Day
    Weight:
    0.25 LBS
    BORE SIZE IMPERIAL:
    3.518'
    UNITS:
    SET
    PRODUCT NAME:
    PISTON RING
    RIDING STYLE:
    STREET
    STYLE:
    PERFORMANCE REPLACEMENT
    BORE - OVERSIZE:
    +0,020'
    BORE OVERSIZE - IMPERIAL:
    +0.020'
    RING MATERIAL:
    MOLY COATED
    $87.21
    Qty in Cart: 0
    Quantity:
    Price:
    $87.21
    Subtotal:
  • Hastings HASTINGS Piston Rings - Shovelhead 2M6127010

    Hastings HASTINGS Piston Rings - Shovelhead 2M6127010

    HASTINGS

    $87.21
    Piston rings are critical to engine sealing, compression, and oil control—wear them out, and you're looking at lost power, blow-by, and accelerated engine wear. The Hastings 2M6127010 delivers the...
    DS750831
    SKU:
    DS750831
    Availability:
    Ships Same Business Day
    Weight:
    0.25 LBS
    UNITS:
    SET
    BORE - OVERSIZE:
    +0,010'
    PRODUCT NAME:
    PISTON RING
    STYLE:
    PERFORMANCE REPLACEMENT
    BORE OVERSIZE - IMPERIAL:
    +0.010'
    BORE SIZE IMPERIAL:
    3.508'
    RIDING STYLE:
    STREET
    RING MATERIAL:
    MOLY COATED
    $87.21
    Qty in Cart: 0
    Quantity:
    Price:
    $87.21
    Subtotal:
  • Hastings HASTINGS Piston Rings - Shovelhead 2M6127

    Hastings HASTINGS Piston Rings - Shovelhead 2M6127

    HASTINGS

    $87.21
    Piston rings are critical to engine longevity—they seal combustion pressure, regulate oil consumption, and maintain compression. Hastings rings are engineered for durability and consistent...
    DS750830
    SKU:
    DS750830
    Availability:
    Ships Same Business Day
    Weight:
    0.25 LBS
    BORE - OVERSIZE:
    +0,060'
    PRODUCT NAME:
    PISTON RING
    STYLE:
    PERFORMANCE REPLACEMENT
    BORE OVERSIZE - IMPERIAL:
    +0.060'
    BORE SIZE IMPERIAL:
    3.498'
    RING MATERIAL:
    MOLY COATED
    UNITS:
    SET
    RIDING STYLE:
    STREET
    $87.21
    Qty in Cart: 0
    Quantity:
    Price:
    $87.21
    Subtotal:
  • Hastings HASTINGS Piston Rings - 1200 2M6482070

    Hastings HASTINGS Piston Rings - 1200 2M6482070

    HASTINGS

    $85.02
    Piston rings are critical to engine performance—they seal combustion pressure, control oil consumption, and directly impact horsepower delivery and engine longevity. Hastings rings are engineered to...
    DS750827
    SKU:
    DS750827
    Availability:
    Ships Same Business Day
    Weight:
    0.25 LBS
    BORE - OVERSIZE:
    +0,070'
    PRODUCT NAME:
    PISTON RING
    STYLE:
    PERFORMANCE REPLACEMENT
    RING MATERIAL:
    MOLY COATED
    UNITS:
    SET
    BORE OVERSIZE - IMPERIAL:
    +0.070'
    BORE SIZE IMPERIAL:
    3.507'
    RIDING STYLE:
    STREET
    $85.02
    Qty in Cart: 0
    Quantity:
    Price:
    $85.02
    Subtotal:
  • Hastings HASTINGS Piston Rings - 1200 2M6482060

    Hastings HASTINGS Piston Rings - 1200 2M6482060

    HASTINGS

    $89.35
    Piston rings are critical to engine sealing and compression—worn or substandard rings will cause blow-by, oil consumption, and power loss. Hastings piston rings are engineered for durability and...
    DS750826
    SKU:
    DS750826
    Availability:
    Ships Same Business Day
    Weight:
    0.25 LBS
    BORE SIZE IMPERIAL:
    3.437'
    UNITS:
    SET
    PRODUCT NAME:
    PISTON RING
    STYLE:
    PERFORMANCE REPLACEMENT
    RIDING STYLE:
    STREET
    BORE - OVERSIZE:
    +0,060'
    BORE OVERSIZE - IMPERIAL:
    +0.060'
    RING MATERIAL:
    MOLY COATED
    $89.35
    Qty in Cart: 0
    Quantity:
    Price:
    $89.35
    Subtotal:
  • Hastings HASTINGS Piston Rings - 1200 2M6482050

    Hastings HASTINGS Piston Rings - 1200 2M6482050

    HASTINGS

    $89.35
    Piston rings are critical to engine sealing and compression—worn or substandard rings lead to blow-by, oil consumption, and power loss. The Hastings 1200 2M6482050 delivers OEM-quality engineering...
    DS750825
    SKU:
    DS750825
    Availability:
    Ships Same Business Day
    Weight:
    0.25 LBS
    BORE SIZE IMPERIAL:
    3.487'
    PRODUCT NAME:
    PISTON RING
    RING MATERIAL:
    MOLY COATED
    STYLE:
    PERFORMANCE REPLACEMENT
    BORE - OVERSIZE:
    +0,050'
    RIDING STYLE:
    STREET
    BORE OVERSIZE - IMPERIAL:
    +0.050'
    UNITS:
    SET
    $89.35
    Qty in Cart: 0
    Quantity:
    Price:
    $89.35
    Subtotal:
  • Hastings HASTINGS Piston Rings - 1200 2M6482020

    Hastings HASTINGS Piston Rings - 1200 2M6482020

    HASTINGS

    $85.02
    Piston rings are the critical seal between your combustion chamber and crankcase—wear them out, and you're looking at blow-by, loss of compression, and accelerated engine degradation. The Hastings...
    DS750822
    SKU:
    DS750822
    Availability:
    Ships Same Business Day
    Weight:
    0.25 LBS
    BORE SIZE IMPERIAL:
    3.457'
    RING MATERIAL:
    MOLY COATED
    STYLE:
    PERFORMANCE REPLACEMENT
    BORE - OVERSIZE:
    +0,020'
    RIDING STYLE:
    STREET
    PRODUCT NAME:
    PISTON RING
    UNITS:
    SET
    BORE OVERSIZE - IMPERIAL:
    +0.020'
    Qty in Cart: 0
    Quantity:
    Price:
    $85.02
    Subtotal:
  • Hastings HASTINGS Piston Rings - 1200 2M6482010

    Hastings HASTINGS Piston Rings - 1200 2M6482010

    HASTINGS

    $85.02
    Piston rings are critical to engine sealing, compression, and oil control—and worn or substandard rings lead to blow-by, power loss, and accelerated wear. The Hastings 2M6482010 piston ring set...
    DS750821
    SKU:
    DS750821
    Availability:
    Ships Same Business Day
    Weight:
    0.15 LBS
    BORE SIZE IMPERIAL:
    3.447'
    UNITS:
    SET
    BORE OVERSIZE - IMPERIAL:
    +0.010'
    PRODUCT NAME:
    PISTON RING
    RIDING STYLE:
    STREET
    STYLE:
    PERFORMANCE REPLACEMENT
    BORE - OVERSIZE:
    +0,010'
    RING MATERIAL:
    MOLY COATED
    $85.02
    Qty in Cart: 0
    Quantity:
    Price:
    $85.02
    Subtotal:
  • Hastings HASTINGS Piston Rings - 1200 2M6482

    Hastings HASTINGS Piston Rings - 1200 2M6482

    HASTINGS

    $85.02
    Piston rings are the critical seal between your combustion chamber and crankcase—without proper ring design, you'll lose compression, burn oil, and compromise power output. Hastings engineered these...
    DS750820
    SKU:
    DS750820
    Availability:
    Ships Same Business Day
    Weight:
    0.20 LBS
    RIDING STYLE:
    STREET
    BORE - OVERSIZE:
    STANDARD
    BORE OVERSIZE - IMPERIAL:
    STANDARD
    UNITS:
    SET
    RING MATERIAL:
    MOLY COATED
    STYLE:
    OEM REPLACEMENT
    BORE SIZE IMPERIAL:
    3.437'
    PRODUCT NAME:
    PISTON RING
    $85.02
    Qty in Cart: 0
    Quantity:
    Price:
    $85.02
    Subtotal:
  • Hastings HASTINGS Piston Rings - XL 2M7003030

    Hastings HASTINGS Piston Rings - XL 2M7003030

    HASTINGS

    $89.95
    Hastings piston rings deliver the precision fit and durability demanded by serious racers and rebuild specialists. These replacement rings are engineered to work seamlessly with KB pistons, enabling...
    DS750813
    SKU:
    DS750813
    Availability:
    Ships Same Business Day
    Weight:
    0.25 LBS
    RING MATERIAL:
    MOLY COATED
    RIDING STYLE:
    STREET
    BORE - OVERSIZE:
    +0,030'
    BORE OVERSIZE - IMPERIAL:
    +0.030'
    BORE SIZE IMPERIAL:
    3.217'
    PRODUCT NAME:
    PISTON RING
    UNITS:
    SET
    Qty in Cart: 0
    Quantity:
    Price:
    $89.95
    Subtotal:
  • Hastings HASTINGS Piston Rings - XL 2M7003

    Hastings HASTINGS Piston Rings - XL 2M7003

    HASTINGS

    $89.95
    Hastings piston rings deliver the precision fit and durability that high-performance engines demand. Engineered to work seamlessly with KB pistons, these rings extend component lifespan while...
    DS750810
    SKU:
    DS750810
    Availability:
    Ships Same Business Day
    Weight:
    0.25 LBS
    BORE SIZE IMPERIAL:
    3.1875'
    PRODUCT NAME:
    PISTON RING
    RING MATERIAL:
    MOLY COATED
    BORE - OVERSIZE:
    STANDARD
    BORE OVERSIZE - IMPERIAL:
    STANDARD
    RIDING STYLE:
    STREET
    UNITS:
    SET
    Qty in Cart: 0
    Quantity:
    Price:
    $89.95
    Subtotal:
  • DRAG SPECIALTIES Piston - XL 750769-BX-LB1

    DRAG SPECIALTIES Piston - XL 750769-BX-LB1

    DRAG SPECIALTIES

    $132.45
    OEM-quality pistons are the foundation of a reliable, efficient engine—and replacements need to match that standard. The DRAG SPECIALTIES XL 750769-BX-LB1 delivers cast aluminum construction with a...
    DS750769
    SKU:
    DS750769
    Availability:
    Ships Same Business Day
    Weight:
    2.94 LBS
    BORE SIZE IMPERIAL:
    3.518'
    COMPRESSION RATIO IMPERIAL:
    9.0:1
    RIDING STYLE:
    STREET
    STROKE LENGTH IMPERIAL:
    3-13/16'
    BORE OVERSIZE - IMPERIAL:
    +0.020'
    PISTON DIAMETER IMPERIAL:
    3.518'
    PISTON MATERIAL:
    ALUMINUM
    PRODUCT NAME:
    PISTON
    UNITS:
    KIT
    BORE - OVERSIZE:
    +0,020'
    $132.45
    Qty in Cart: 0
    Quantity:
    Price:
    $132.45
    Subtotal:
  • Total: items /

Adding your products to cart

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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