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Harley Cylinders and Parts

Harley Cylinders and Parts

Harley Cylinders and Parts

Harley Bike Cylinders & Parts at JJ Motorsports

Boost displacement and performance with premium cylinders and parts from JJ Motorsports, featuring big-bore kits, stud sets, and precision-machined cylinders for Sportster, Big Twin, Evo, and M8 engines. These high-quality components deliver reliable compression and perfect fit.

Shop Colony and Revolution Performance for proven durability. Explore related categories such as Harley engine for pistons and gaskets, or Harley for cams and heads to complete your big-bore build.

Top Harley Cylinders & Parts

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
  • REVOLUTION PERFORMANCE, LLC Cylinder Kit - 109" - Black with Highlighted Fins RP201-216W

    REVOLUTION PERFORMANCE, LLC Cylinder Kit - 109" - Black with Highlighted Fins RP201-216W

    REVOLUTION PERFORMANCE, LLC

    $1,455.95
    Revolution™ aerospace-grade all-aluminum cylinders with nickel-silicon-carbide electroplated bores which means NO SLEEVING; allows larger bore sizes and less friction for more horsepower, lower temps and a longer lifespan, Monster power in a package...
    09311064
    SKU:
    09311064
    Availability:
    Ships Same Business Day
    Weight:
    19.36 LBS
    UNITS:
    KIT
    BORE SIZE IMPERIAL:
    3-7/8'
    DISPLACEMENT:
    109'
    MODEL:
    MONSTER
    PRODUCT NAME:
    BIG BORE CYLINDER KIT
    COLOR/FINISH:
    BLACK
    RIDING STYLE:
    STREET
    STROKE LENGTH IMPERIAL:
    4-5/8'
    COLOR/FINISH:
    HIGHLIGHTED FINS
    COMPRESSION RATIO IMPERIAL:
    10.0:1
    $1,455.95
    Qty in Cart: 0
    Quantity:
    Price:
    $1,455.95
    Subtotal:
  • REVOLUTION PERFORMANCE, LLC Cylinder Kit RP201-404W

    REVOLUTION PERFORMANCE, LLC Cylinder Kit RP201-404W

    REVOLUTION PERFORMANCE, LLC

    $1,343.95
    REVOLUTION PERFORMANCE, LLC Cylinder Kit
    09311065
    SKU:
    09311065
    Availability:
    Ships Same Business Day
    Weight:
    18.06 LBS
    BORE SIZE IMPERIAL:
    3.5625'
    DISPLACEMENT:
    1250 CC
    PRODUCT NAME:
    CYLINDER KIT
    RIDING STYLE:
    STREET
    COLOR/FINISH:
    NATURAL
    COMPRESSION RATIO IMPERIAL:
    11.0:1
    STROKE LENGTH IMPERIAL:
    3-13/16'
    UNITS:
    KIT
    $1,343.95
    Qty in Cart: 0
    Quantity:
    Price:
    $1,343.95
    Subtotal:
  • REVOLUTION PERFORMANCE, LLC Cylinder Kit RP201-405W

    REVOLUTION PERFORMANCE, LLC Cylinder Kit RP201-405W

    REVOLUTION PERFORMANCE, LLC

    $1,343.95
    REVOLUTION PERFORMANCE, LLC Cylinder Kit
    09311066
    SKU:
    09311066
    Availability:
    Ships Same Business Day
    Weight:
    18.16 LBS
    BORE SIZE IMPERIAL:
    3.5625'
    COLOR/FINISH:
    HIGHLIGHTED FINS
    COMPRESSION RATIO IMPERIAL:
    11.0:1
    DISPLACEMENT:
    1250 CC
    COLOR/FINISH:
    BLACK
    PRODUCT NAME:
    CYLINDER KIT
    RIDING STYLE:
    STREET
    STROKE LENGTH IMPERIAL:
    3-13/16'
    UNITS:
    KIT
    $1,343.95
    Qty in Cart: 0
    Quantity:
    Price:
    $1,343.95
    Subtotal:
  • REVOLUTION PERFORMANCE, LLC Cylinder Kit RP201-406W

    REVOLUTION PERFORMANCE, LLC Cylinder Kit RP201-406W

    REVOLUTION PERFORMANCE, LLC

    $1,343.95
    REVOLUTION PERFORMANCE, LLC Cylinder Kit
    09311067
    SKU:
    09311067
    Availability:
    Ships Same Business Day
    Weight:
    18.16 LBS
    BORE SIZE IMPERIAL:
    3.5625'
    COMPRESSION RATIO IMPERIAL:
    11.0:1
    DISPLACEMENT:
    1250 CC
    COLOR/FINISH:
    BLACK
    PRODUCT NAME:
    CYLINDER KIT
    RIDING STYLE:
    STREET
    STROKE LENGTH IMPERIAL:
    3-13/16'
    UNITS:
    KIT
    $1,343.95
    Qty in Cart: 0
    Quantity:
    Price:
    $1,343.95
    Subtotal:
  • REVOLUTION PERFORMANCE, LLC Cylinder Kit RP201-414W

    REVOLUTION PERFORMANCE, LLC Cylinder Kit RP201-414W

    REVOLUTION PERFORMANCE, LLC

    $1,343.95
    REVOLUTION PERFORMANCE, LLC Cylinder Kit
    09311068
    SKU:
    09311068
    Availability:
    Ships Same Business Day
    Weight:
    17.96 LBS
    $1,343.95
    Qty in Cart: 0
    Quantity:
    Price:
    $1,343.95
    Subtotal:
  • REVOLUTION PERFORMANCE, LLC Cylinder Kit RP201-411W

    REVOLUTION PERFORMANCE, LLC Cylinder Kit RP201-411W

    REVOLUTION PERFORMANCE, LLC

    $1,479.95
    REVOLUTION PERFORMANCE, LLC Cylinder Kit
    09311072
    SKU:
    09311072
    Availability:
    Ships Same Business Day
    Weight:
    17.61 LBS
    $1,479.95
    Qty in Cart: 0
    Quantity:
    Price:
    $1,479.95
    Subtotal:
  • On Sale
    S&S CYCLE Big Bore Cylinder Set 910-0739

    S&S CYCLE Big Bore Cylinder Set 910-0739

    S&S CYCLE

    MSRP: $970.95
    Now: $854.06
    Was: $970.95
    Bolt on Cylinder Set For M8 Models
    09310877
    SKU:
    09310877
    Availability:
    Ships Same Business Day
    Weight:
    25.70 LBS
    COLOR/FINISH:
    BLACK GRANITE
    STYLE:
    BIG BORE
    DISPLACEMENT:
    124'
    RIDING STYLE:
    STREET
    BORE SIZE IMPERIAL:
    4.250'
    COLOR/FINISH:
    HIGHLIGHTED FINS
    PRODUCT NAME:
    CYLINDER KIT
    UNITS:
    KIT
    MSRP: $970.95
    Now: $854.06
    Was: $970.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $970.95
    Now: $854.06
    Was: $970.95
    Subtotal:
  • DRAG SPECIALTIES Cylinder - Rear - 1200cc - 1966-1980 Shovelhead 750604-BX-LB2

    DRAG SPECIALTIES Cylinder - Rear - 1200cc - 1966-1980 Shovelhead 750604-BX-LB2

    DRAG SPECIALTIES

    $220.37
    Cast-iron cylinders meet or exceed OEM tolerance specifications, Withstand greater pressure and heat than stock
    DS750604
    SKU:
    DS750604
    Availability:
    Ships Same Business Day
    Weight:
    12.13 LBS
    MATERIAL:
    IRON
    PRODUCT NAME:
    CYLINDER
    UNITS:
    EACH
    BORE SIZE IMPERIAL:
    3.435'
    DISPLACEMENT:
    1200 CC
    COLOR/FINISH:
    BLACK
    TYPE:
    REAR
    MATERIAL:
    ALUMINUM
    MATERIAL:
    CAST
    RIDING STYLE:
    STREET
    $220.37
    Qty in Cart: 0
    Quantity:
    Price:
    $220.37
    Subtotal:
  • DRAG SPECIALTIES Cylinder - Front - 1200cc - 1966-1980 Shovelhead 750605-BX-LB2

    DRAG SPECIALTIES Cylinder - Front - 1200cc - 1966-1980 Shovelhead 750605-BX-LB2

    DRAG SPECIALTIES

    $198.74
    Cast-iron cylinders meet or exceed OEM tolerance specifications, Withstand greater pressure and heat than stock
    DS750605
    SKU:
    DS750605
    Availability:
    Ships Same Business Day
    Weight:
    11.63 LBS
    UNITS:
    EACH
    BORE SIZE IMPERIAL:
    3.435'
    DISPLACEMENT:
    1200 CC
    MATERIAL:
    ALUMINUM
    MATERIAL:
    CAST
    RIDING STYLE:
    STREET
    TYPE:
    FRONT
    COLOR/FINISH:
    BLACK
    MATERIAL:
    IRON
    PRODUCT NAME:
    CYLINDER
    Qty in Cart: 0
    Quantity:
    Price:
    $198.74
    Subtotal:
  • DRAG SPECIALTIES Cylinder - Rear - 74" - 1948-1965 Panhead 750606-BX-LB2

    DRAG SPECIALTIES Cylinder - Rear - 74" - 1948-1965 Panhead 750606-BX-LB2

    DRAG SPECIALTIES

    $198.74
    Cast-iron cylinders meet or exceed OEM tolerance specifications, Withstand greater pressure and heat than stock
    DS750606
    SKU:
    DS750606
    Availability:
    Ships Same Business Day
    Weight:
    11.63 LBS
    DISPLACEMENT:
    74'
    MATERIAL:
    IRON
    PRODUCT NAME:
    CYLINDER
    UNITS:
    EACH
    COLOR/FINISH:
    BLACK
    TYPE:
    REAR
    BORE SIZE IMPERIAL:
    3.435'
    MATERIAL:
    ALUMINUM
    MATERIAL:
    CAST
    RIDING STYLE:
    STREET
    $198.74
    Qty in Cart: 0
    Quantity:
    Price:
    $198.74
    Subtotal:
  • DRAG SPECIALTIES Cylinder - Front - 74" - 1948-1965 Panhead 750607-BX-LB2

    DRAG SPECIALTIES Cylinder - Front - 74" - 1948-1965 Panhead 750607-BX-LB2

    DRAG SPECIALTIES

    $198.74
    Cast-iron cylinders meet or exceed OEM tolerance specifications, Withstand greater pressure and heat than stock
    DS750607
    SKU:
    DS750607
    Availability:
    Ships Same Business Day
    Weight:
    11.81 LBS
    DISPLACEMENT:
    74'
    MATERIAL:
    IRON
    PRODUCT NAME:
    CYLINDER
    UNITS:
    EACH
    COLOR/FINISH:
    BLACK
    TYPE:
    FRONT
    BORE SIZE IMPERIAL:
    3.435'
    MATERIAL:
    ALUMINUM
    MATERIAL:
    CAST
    RIDING STYLE:
    STREET
    $198.74
    Qty in Cart: 0
    Quantity:
    Price:
    $198.74
    Subtotal:
  • DRAG SPECIALTIES Cylinder - Natural - 1986-2003 1200XL 16447-88-LB2

    DRAG SPECIALTIES Cylinder - Natural - 1986-2003 1200XL 16447-88-LB2

    DRAG SPECIALTIES

    $257.45
    Replacement cylinders feature ductile cast-iron sleeves in aluminum castings, Sleeve has external ribs that “lock” the sleeve to the aluminum casting so it cannot move, Excellent for stock replacement, Cylinders are finished slightly undersized so they...
    DS750506
    SKU:
    DS750506
    Availability:
    Ships Same Business Day
    Weight:
    6.94 LBS
    TYPE:
    REAR
    MATERIAL:
    IRON
    PRODUCT NAME:
    CYLINDER
    UNITS:
    EACH
    BORE SIZE IMPERIAL:
    3.498'
    DISPLACEMENT:
    1200 CC
    COLOR/FINISH:
    ALUMINUM
    MATERIAL:
    ALUMINUM
    MATERIAL:
    CAST
    RIDING STYLE:
    STREET
    STROKE LENGTH IMPERIAL:
    3-13/16'
    TYPE:
    FRONT
    $257.45
    Qty in Cart: 0
    Quantity:
    Price:
    $257.45
    Subtotal:
  • DRAG SPECIALTIES Cylinder - 1200cc- 1988-2003 - XL - Black 09310018BLK-LB2

    DRAG SPECIALTIES Cylinder - 1200cc- 1988-2003 - XL - Black 09310018BLK-LB2

    DRAG SPECIALTIES

    $295.56
    Replacement cylinders feature ductile cast-iron sleeves in aluminum castings, Sleeve has external ribs that “lock” the sleeve to the aluminum casting so it cannot move, Excellent for stock replacement, Cylinders are finished slightly undersized so they...
    09310018
    SKU:
    09310018
    Availability:
    Ships Same Business Day
    Weight:
    7.29 LBS
    DISPLACEMENT:
    1200 CC
    MATERIAL:
    CAST
    PRODUCT NAME:
    CYLINDER
    RIDING STYLE:
    STREET
    BORE SIZE IMPERIAL:
    3.500'
    COLOR/FINISH:
    HIGHLIGHTED FINS
    COLOR/FINISH:
    BLACK
    MATERIAL:
    ALUMINUM
    MATERIAL:
    IRON
    UNITS:
    EACH
    $295.56
    Qty in Cart: 0
    Quantity:
    Price:
    $295.56
    Subtotal:
  • DRAG SPECIALTIES Cylinder - 1340cc - 1984-1999 Big Twin 16510-83A-LB2

    DRAG SPECIALTIES Cylinder - 1340cc - 1984-1999 Big Twin 16510-83A-LB2

    DRAG SPECIALTIES

    $247.15
    Replacement cylinders feature ductile cast-iron sleeves in aluminum castings, Sleeve has external ribs that “lock” the sleeve to the aluminum casting so it cannot move, Excellent for stock replacement, Cylinders are finished slightly undersized so they...
    DS750507
    SKU:
    DS750507
    Availability:
    Ships Same Business Day
    Weight:
    8.44 LBS
    BORE SIZE IMPERIAL:
    3.498'
    DISPLACEMENT:
    1340 CC
    STROKE LENGTH IMPERIAL:
    4-1/4'
    TYPE:
    REAR
    MATERIAL:
    ALUMINUM
    MATERIAL:
    CAST
    MATERIAL:
    IRON
    COLOR/FINISH:
    ALUMINUM
    PRODUCT NAME:
    CYLINDER
    RIDING STYLE:
    STREET
    TYPE:
    FRONT
    UNITS:
    EACH
    $247.15
    Qty in Cart: 0
    Quantity:
    Price:
    $247.15
    Subtotal:
  • DRAG SPECIALTIES Cylinder - 1340cc - 1984-1999 Evolution - Black 09310017BLK

    DRAG SPECIALTIES Cylinder - 1340cc - 1984-1999 Evolution - Black 09310017BLK

    DRAG SPECIALTIES

    $325.43
    Replacement cylinders feature ductile cast-iron sleeves in aluminum castings, Sleeve has external ribs that “lock” the sleeve to the aluminum casting so it cannot move, Excellent for stock replacement, Cylinders are finished slightly undersized so they...
    09310017
    SKU:
    09310017
    Availability:
    Ships Same Business Day
    Weight:
    8.41 LBS
    MATERIAL:
    CAST
    PRODUCT NAME:
    CYLINDER
    RIDING STYLE:
    STREET
    BORE SIZE IMPERIAL:
    3.500'
    COLOR/FINISH:
    HIGHLIGHTED FINS
    COLOR/FINISH:
    ALUMINUM
    COLOR/FINISH:
    BLACK
    DISPLACEMENT:
    1340 CC
    MATERIAL:
    ALUMINUM
    MATERIAL:
    IRON
    UNITS:
    EACH
    $325.43
    Qty in Cart: 0
    Quantity:
    Price:
    $325.43
    Subtotal:
  • On Sale
    S&S CYCLE Cylinder Kit 910-0690

    S&S CYCLE Cylinder Kit 910-0690

    S&S CYCLE

    MSRP: $1,077.95
    Now: $941.36
    Was: $1,077.95
    Forged pistons - coated piston skirts with measurement window and S&S logo, Forged pistons have larger than stock valve pockets and accepts up to 2.00" valves, Kit includes S&S 1250cc pistons with rings and wristpins, S&S 3-9/16" bore cylinders, MLS...
    09310529
    SKU:
    09310529
    Availability:
    Ships Same Business Day
    Weight:
    22.95 LBS
    COLOR/FINISH:
    SILVER
    COMPRESSION RATIO IMPERIAL:
    11.2:1
    MATERIAL:
    ALUMINUM
    MATERIAL:
    IRON
    STYLE:
    BIG BORE
    BORE SIZE IMPERIAL:
    3.562'
    DISPLACEMENT:
    1250 CC
    MATERIAL:
    CAST
    RIDING STYLE:
    STREET
    STROKE LENGTH IMPERIAL:
    3-13/16'
    PRODUCT NAME:
    CYLINDER KIT
    TYPE:
    DOMED
    UNITS:
    KIT
    MSRP: $1,077.95
    Now: $941.36
    Was: $1,077.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $1,077.95
    Now: $941.36
    Was: $1,077.95
    Subtotal:
  • On Sale
    S&S CYCLE Cylinders - 4.25" - M8 - Black 910-0683

    S&S CYCLE Cylinders - 4.25" - M8 - Black 910-0683

    S&S CYCLE

    MSRP: $970.95
    Now: $854.06
    Was: $970.95
    Bolt-on cylinder set, For 4.375" stroke motors, Made in the U.S.A.
    09310837
    SKU:
    09310837
    Availability:
    Ships Same Business Day
    Weight:
    26.61 LBS
    BORE SIZE IMPERIAL:
    4.250'
    COLOR/FINISH:
    NON-HIGHLIGHTED FINS
    PRODUCT NAME:
    CYLINDER
    RIDING STYLE:
    STREET
    COLOR/FINISH:
    WRINKLE BLACK
    STYLE:
    BIG BORE
    UNITS:
    PAIR
    MSRP: $970.95
    Now: $854.06
    Was: $970.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $970.95
    Now: $854.06
    Was: $970.95
    Subtotal:
  • On Sale
    S&S CYCLE Cylinders and Pistons - 80" - Low Compression 91-9024

    S&S CYCLE Cylinders and Pistons - 80" - Low Compression 91-9024

    S&S CYCLE

    MSRP: $1,995.95
    Now: $1,799.96
    Was: $1,995.95
    Intended to replace the cylinders and pistons of a 80" Shovelhead engine and maintain the stock compression ratio of 8:1, Compatible with stock or S&S cylinder heads, Includes S&S 3.5" bore high tensile cast iron cylinders, 3.5" bore forged standard...
    09310688
    SKU:
    09310688
    Availability:
    Ships Same Business Day
    Weight:
    33.00 LBS
    MATERIAL:
    CAST IRON
    PRODUCT NAME:
    CYLINDER AND PISTON KIT
    COLOR/FINISH:
    POWDER-COATED
    STROKE LENGTH IMPERIAL:
    4-1/4'
    BORE SIZE IMPERIAL:
    3.500'
    COMPRESSION RATIO IMPERIAL:
    8.0:1
    STYLE:
    STOCK
    UNITS:
    KIT
    DISPLACEMENT:
    80'
    RIDING STYLE:
    STREET
    TYPE:
    REPLACEMENT
    MSRP: $1,995.95
    Now: $1,799.96
    Was: $1,995.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $1,995.95
    Now: $1,799.96
    Was: $1,995.95
    Subtotal:
  • On Sale
    S&S CYCLE Cylinder/Piston Kit - Natural 910-0179

    S&S CYCLE Cylinder/Piston Kit - Natural 910-0179

    S&S CYCLE

    MSRP: $1,155.95
    Now: $1,009.76
    Was: $1,155.95
    Cylinder and piston kits contain S&S 3-1/2" bore (80") cylinders and forged pistons, rings, wrist pins, and head and base gaskets, The pistons included in kits are flat-topped cast pistons designed to be used with either stock cylinder heads or with S&S...
    09310737
    SKU:
    09310737
    Availability:
    Ships Same Business Day
    Weight:
    27.65 LBS
    STROKE LENGTH IMPERIAL:
    4.250'
    PRODUCT NAME:
    CYLINDER AND PISTON KIT
    COMPRESSION RATIO IMPERIAL:
    8.8:1
    DISPLACEMENT:
    80'
    RIDING STYLE:
    STREET
    BORE SIZE IMPERIAL:
    3.500'
    COLOR/FINISH:
    NATURAL ALUMINUM
    UNITS:
    KIT
    MSRP: $1,155.95
    Now: $1,009.76
    Was: $1,155.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $1,155.95
    Now: $1,009.76
    Was: $1,155.95
    Subtotal:
  • On Sale
    S&S CYCLE Cylinder/Piston Kit - Black 910-0182

    S&S CYCLE Cylinder/Piston Kit - Black 910-0182

    S&S CYCLE

    MSRP: $1,231.95
    Now: $1,076.36
    Was: $1,231.95
    Cylinder and piston kits contain S&S 3-1/2" bore (80") cylinders and forged pistons, rings, wrist pins, and head and base gaskets, The pistons included in kits are flat-topped cast pistons designed to be used with either stock cylinder heads or with S&S...
    09310738
    SKU:
    09310738
    Availability:
    Ships Same Business Day
    Weight:
    27.71 LBS
    PRODUCT NAME:
    CYLINDER AND PISTON KIT
    BORE SIZE IMPERIAL:
    3.500'
    COLOR/FINISH:
    WRINKLE BLACK
    UNITS:
    KIT
    COMPRESSION RATIO IMPERIAL:
    8.8:1
    DISPLACEMENT:
    80'
    RIDING STYLE:
    STREET
    STROKE LENGTH IMPERIAL:
    4.250'
    MSRP: $1,231.95
    Now: $1,076.36
    Was: $1,231.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $1,231.95
    Now: $1,076.36
    Was: $1,231.95
    Subtotal:
  • Total: items /

Adding your products to cart

Buying Guide and FAQs

Buying Guide: Factors to Consider When Choosing Harley Bike Engine Cylinders and Parts

  • Compatibility: Ensure cylinders and parts match your Harley's engine type (e.g., Big Twin 1930-1984, Twin Cam, Sportster) and specifics like bore size (3.500" to 4.500") or stroke (4" to 4-5/8"). Use the vehicle selector for year-specific fits to avoid performance or rebuild issues.
  • Type of Use: For standard rebuilds, opt for stud sets for secure cylinder mounting; big-bore upgrades (85ci to 143ci) suit performance engines for increased horsepower and displacement in street or touring conditions.
  • Components and Upgrades: Select stud sets (4/8-pack) or big-bore kits with pistons; upgrade to no-sleeving cylinders with electroplated bores for friction reduction. Focus on compression ratios (9.0:1-11.3:1) and finishes (natural, silver, black, highlighted fins) for optimal performance.
  • Brand and Quality: Choose Colony for heat-treated stud sets in chrome/black, Revolution Performance LLC for aerospace-grade aluminum cylinder kits with nickel-silicon-carbide bores, or Eastern Motorcycle Parts for base studs. Prioritize USA-made quality for durability and lower engine temperatures.
  • Installation and Cost: Parts are bolt-on for easy DIY rebuilds; kits include pistons for complete upgrades. Prices range from $10.95 for stud packs to $1,899.95 for premium cylinder kits—factor in same-day shipping and free shipping over $99 for value.

Frequently Asked Questions (FAQs)

  1. What Harley models and engines do these cylinders and parts support? Parts support Big Twin (1930-1984), Twin Cam (e.g., 98ci to 101ci), Sportster (e.g., 1200cc to 128ci)—use the year/make/model filter for exact compatibility with bore/stroke specifics.
  2. How do big-bore cylinder kits improve performance? They increase displacement (e.g., 85ci to 143ci) and horsepower with no-sleeving electroplated bores for less friction, lower temps, and longer lifespan.
  3. What is typically included in a cylinder kit? Kits include cylinders, pistons (e.g., flat-top), with options for finishes like black with highlighted fins—check details for compression ratios (9.0:1-11.3:1).
  4. Are stud sets durable? Yes, heat-treated steel with chrome/black finishes provides high strength and perfect thread engagement for secure cylinder mounting.
  5. What if a part doesn't fit my Harley? Verify bore size, stroke, and model before buying. Our returns policy allows exchanges or refunds if it doesn't match.
  6. Can I find related engine parts? Yes—explore pistons/rings, gaskets, or cams in the Harley engine category to complement your cylinders upgrade for a full rebuild.

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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