Harley Piston Rings Only
Harley Bike Piston Rings at JJ Motorsports
Refresh your Harley’s top end with premium piston ring sets from JJ Motorsports, featuring chrome, moly, and high-performance coatings for perfect sealing, reduced blow-by, and maximum durability on Sportster, Big Twin, Evo, Twin Cam, and M8 engines. These precision rings deliver reliable compression and long life.
Shop Hastings, Wiseco, and Revolution Performance rings for proven quality. Explore related categories such as Harley engine for pistons and gaskets, or Harley for cylinders and heads to complete your top-end rebuild.
Top Harley Piston Rings
- Hastings Piston Rings XL-7003 – Chrome-faced ring set for Sportster; excellent wear resistance and oil control.
- Wiseco Ring Set 3504X – High-performance ring set for 3.504" bore; moly-coated top ring for Twin Cam and Evo builds.
- Revolution Performance LLC Ring Set RP4250VMF – Premium ring set for 4.250" bore; designed for high-compression M8 and performance applications.
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
-
KB PERFORMANCE Piston Kit - Evolution KB305.000
KB PERFORMANCE
$246.95If you're building or rebuilding a high-performance engine, piston quality directly impacts reliability, ring seal, and longevity under sustained load. KB Performance's Evolution KB305.000 kit...DS751265- SKU:
- DS751265
- Availability:
- Ships Same Business Day
- Weight:
- 2.75 LBS
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- BORE SIZE IMPERIAL:
- 3.498'
- COMPRESSION RATIO IMPERIAL:
- 9.6:1
- UNITS:
- KIT
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
$246.95 -
KB PERFORMANCE Piston Kit - Evolution KB305.005
KB PERFORMANCE
$246.95If you're building an engine that demands precision and reliability, KB Performance pistons deliver the tight tolerances and consistent weight distribution that separate competitive builds from the...DS751266- SKU:
- DS751266
- Availability:
- Ships Same Business Day
- Weight:
- 2.80 LBS
- BORE SIZE IMPERIAL:
- 3.498'
- COMPRESSION RATIO IMPERIAL:
- 9.6:1
- BORE OVERSIZE - IMPERIAL:
- +0.005'
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
$246.95 -
KB PERFORMANCE Piston Kit - Evolution KB305.010
KB PERFORMANCE
$246.95KB Performance's Evolution KB305.010 piston kit delivers the tight tolerances and superior ring seal that separate competitive engines from the rest. With diamond-machined precision and hypereutectic...DS751267- SKU:
- DS751267
- Availability:
- Ships Same Business Day
- Weight:
- 2.75 LBS
- BORE SIZE IMPERIAL:
- 3.498'
- UNITS:
- KIT
- BORE OVERSIZE - IMPERIAL:
- +0.010'
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
- COMPRESSION RATIO IMPERIAL:
- 9.6:1
$246.95 -
KB PERFORMANCE Piston Kit - Evolution KB305.020
KB PERFORMANCE
$246.95KB Performance pistons are engineered for racers and serious builders who demand precision and durability under extreme conditions. The tight tolerances and superior heat treatment of these 390...DS751268- SKU:
- DS751268
- Availability:
- Ships Same Business Day
- Weight:
- 2.75 LBS
- UNITS:
- KIT
- BORE OVERSIZE - IMPERIAL:
- +0.020'
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
- BORE SIZE IMPERIAL:
- 3.498'
- COMPRESSION RATIO IMPERIAL:
- 9.6:1
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
$246.95Qty in Cart: 0Quantity:Price:$246.95Subtotal: -
KB PERFORMANCE Piston Kit - Evolution KB305.030
KB PERFORMANCE
$246.95If you're pushing your engine to the limit, piston quality directly impacts reliability, ring seal, and longevity under sustained high-RPM operation. KB Performance's Evolution KB305.030 kit delivers...DS751269- SKU:
- DS751269
- Availability:
- Ships Same Business Day
- Weight:
- 2.85 LBS
- UNITS:
- KIT
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
- BORE OVERSIZE - IMPERIAL:
- +0.030'
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- 3.498'
- COMPRESSION RATIO IMPERIAL:
- 9.6:1
$246.95 -
KB PERFORMANCE Piston Kit - Twin Cam KB348.000
KB PERFORMANCE
$295.95If you're building or rebuilding a high-performance engine, piston quality directly impacts reliability, ring seal, and longevity. KB Performance's Twin Cam KB348.000 kit delivers the precision...DS751281- SKU:
- DS751281
- Availability:
- Ships Same Business Day
- Weight:
- 3.00 LBS
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 9.3:1
- BORE SIZE IMPERIAL:
- 3.875'
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
$295.95Qty in Cart: 0Quantity:Price:$295.95Subtotal: -
KB PERFORMANCE Piston Kit - Twin Cam KB348.005
KB PERFORMANCE
$295.95If you're serious about extending piston life and maximizing ring seal in your Twin Cam engine, KB Performance's diamond-machined pistons deliver the precision tolerances that separate reliable...DS751282- SKU:
- DS751282
- Availability:
- Ships Same Business Day
- Weight:
- 3.05 LBS
- BORE OVERSIZE - IMPERIAL:
- +0.005'
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- COMPRESSION RATIO IMPERIAL:
- 9.3:1
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.875'
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
$295.95 -
KB PERFORMANCE Piston Kit - Twin Cam KB411.005
KB PERFORMANCE
$307.95If you're running a high-performance Twin Cam engine, piston quality directly impacts your power output, engine longevity, and reliability. KB Performance pistons are precision-engineered to tighter...DS751287- SKU:
- DS751287
- Availability:
- Ships Same Business Day
- Weight:
- 3.08 LBS
- BORE OVERSIZE - IMPERIAL:
- +0.005'
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.875'
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
- RIDING STYLE:
- STREET
$307.95 -
KB PERFORMANCE Piston Kit KB411.010
KB PERFORMANCE
$307.95If you're building a high-performance engine that demands tight tolerances and consistent ring seal, KB Performance pistons are engineered to deliver. The T-5 heat-treated 390 hypereutectic aluminum...DS751288- SKU:
- DS751288
- Availability:
- Ships Same Business Day
- Weight:
- 3.20 LBS
- BORE OVERSIZE - IMPERIAL:
- +0.010'
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- 3.875'
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
- UNITS:
- KIT
$307.95Qty in Cart: 0Quantity:Price:$307.95Subtotal: -
KB PERFORMANCE Piston Kit - Twin Cam 88 KB425C.STD
KB PERFORMANCE
$287.95If you're building a high-revving Twin Cam 88 engine that demands precision and longevity, KB Performance pistons are engineered to deliver tighter tolerances and superior ring seal than standard...09106087- SKU:
- 09106087
- Availability:
- Ships Same Business Day
- Weight:
- 3.01 LBS
- COMPRESSION RATIO IMPERIAL:
- 8.8:1
- UNITS:
- KIT
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- BORE SIZE IMPERIAL:
- 3.750'
- PISTON HEAD SHAPE:
- FLAT TOP
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
$287.95Qty in Cart: 0Quantity:Price:$287.95Subtotal: -
KB PERFORMANCE Piston Kit - Twin Cam 88 KB425C.005
KB PERFORMANCE
$287.95If you're building a Twin Cam 88 engine that demands precision and longevity, KB Performance pistons are engineered to deliver tighter tolerances and superior ring seal that production alternatives...09106088- SKU:
- 09106088
- Availability:
- Ships Same Business Day
- Weight:
- 3.01 LBS
- COMPRESSION RATIO IMPERIAL:
- 8.8:1
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- BORE OVERSIZE - IMPERIAL:
- +0.005'
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.750'
- PISTON HEAD SHAPE:
- FLAT TOP
$287.95Qty in Cart: 0Quantity:Price:$287.95Subtotal: -
KB PERFORMANCE Piston Kit - Twin Cam 88 KB425C.010
KB PERFORMANCE
$287.95If you're building or rebuilding a Twin Cam 88 engine for serious performance, piston quality directly impacts reliability, ring seal, and longevity under boost or sustained high RPM. KB...09106089- SKU:
- 09106089
- Availability:
- Ships Same Business Day
- Weight:
- 3.01 LBS
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.750'
- COMPRESSION RATIO IMPERIAL:
- 8.8:1
- PISTON HEAD SHAPE:
- FLAT TOP
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
- RIDING STYLE:
- STREET
- BORE OVERSIZE - IMPERIAL:
- +0.010'
- PRODUCT NAME:
- PISTON KIT
$287.95 -
KB PERFORMANCE Piston Kit - Twin Cam 88 KB425C.020
KB PERFORMANCE
$287.95If you're serious about Twin Cam 88 performance and longevity, piston quality directly impacts your engine's reliability and power output. KB Performance pistons are manufactured to exacting...09106090- SKU:
- 09106090
- Availability:
- Ships Same Business Day
- Weight:
- 3.06 LBS
- COMPRESSION RATIO IMPERIAL:
- 8.8:1
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.750'
- PISTON HEAD SHAPE:
- FLAT TOP
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
- BORE OVERSIZE - IMPERIAL:
- +0.020'
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
$287.95 -
KB PERFORMANCE Piston Kit - Twin Cam 88 KB425C.030
KB PERFORMANCE
$287.95If you're building a high-performance Twin Cam 88 engine, piston quality directly impacts reliability and ring seal integrity. KB Performance pistons are diamond-machined to exacting tolerances—plus...09106091- SKU:
- 09106091
- Availability:
- Ships Same Business Day
- Weight:
- 3.06 LBS
- COMPRESSION RATIO IMPERIAL:
- 8.8:1
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.750'
- PISTON HEAD SHAPE:
- FLAT TOP
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
- BORE OVERSIZE - IMPERIAL:
- +0.030'
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
$287.95 -
KB PERFORMANCE Piston Kit - Twin Cam 88 KB426C.STD
KB PERFORMANCE
$295.95If you're building or rebuilding a Twin Cam 88 engine and demand maximum ring seal with minimal piston rock, KB Performance pistons deliver the precision tolerances and material science that separate...09106092- SKU:
- 09106092
- Availability:
- Ships Same Business Day
- Weight:
- 3.21 LBS
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.750'
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- PISTON KIT
$295.95 -
KB PERFORMANCE Piston Kit - Twin Cam 88 KB426C.010
KB PERFORMANCE
$295.95If you're building a high-revving Twin Cam 88 engine that demands precision ring seal and minimal piston rock, KB Performance pistons are engineered to deliver exactly that. The diamond-machined...09106094- SKU:
- 09106094
- Availability:
- Ships Same Business Day
- Weight:
- 3.26 LBS
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- BORE OVERSIZE - IMPERIAL:
- +0.010'
- BORE SIZE IMPERIAL:
- 3.750'
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
$295.95Qty in Cart: 0Quantity:Price:$295.95Subtotal: -
KB PERFORMANCE Piston Kit - Twin Cam 88 KB426C.020
KB PERFORMANCE
$295.95If you're building or rebuilding a Twin Cam 88 engine and demand maximum ring seal, minimal piston rock, and extended component life, KB Performance pistons are engineered to deliver. Their tight...09106095- SKU:
- 09106095
- Availability:
- Ships Same Business Day
- Weight:
- 3.26 LBS
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- BORE OVERSIZE - IMPERIAL:
- +0.020'
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.750'
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
$295.95 -
KB PERFORMANCE Piston Kit - Standard - M8 KB542LCA.STD
KB PERFORMANCE
$427.95If you're pushing your M8 to the edge, factory pistons won't cut it. The KB PERFORMANCE Super Duty Series delivers the durability and precision clearances you need for sustained high-RPM operation,...09105724- SKU:
- 09105724
- Availability:
- Ships Same Business Day
- Weight:
- 2.96 LBS
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- STROKE LENGTH IMPERIAL:
- 4-1/2'
- UNITS:
- KIT
- DISPLACEMENT:
- 117'
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- BORE SIZE METRIC:
- 104.77 MM
- PISTON MATERIAL:
- ALUMINUM
$427.95Qty in Cart: 0Quantity:Price:$427.95Subtotal: -
KB PERFORMANCE PISTON KIT M8 117" +020 KB542LCA.020
KB PERFORMANCE
$427.95If you're pushing your M8 to the 117" displacement sweet spot, you need pistons engineered for high-RPM reliability and consistent ring sealing under boost. The KB Performance Super Duty Series...09105726- SKU:
- 09105726
- Availability:
- Ships Same Business Day
- Weight:
- 2.91 LBS
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- STROKE LENGTH IMPERIAL:
- 4-1/2'
- BORE SIZE METRIC:
- 104.77 MM
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- DISPLACEMENT:
- 117'
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
$427.95 -
KB PERFORMANCE Piston Kit - 124" - Standard - M8 KB576LCA.STD
KB PERFORMANCE
$446.95If you're building or rebuilding a 124-cubic-inch M8 engine, piston selection is non-negotiable—the wrong choice will cost you reliability, power, and consistency. KB Performance pistons are...09106177- SKU:
- 09106177
- Availability:
- Ships Same Business Day
- Weight:
- 3.15 LBS
- BORE SIZE IMPERIAL:
- 4.250'
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- DISPLACEMENT:
- 124'
- BORE - OVERSIZE:
- STANDARD
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- UNITS:
- KIT
$446.95Qty in Cart: 0Quantity:Price:$446.95Subtotal:
Buying Guide and FAQs
Buying Guide: Factors to Consider When Choosing Harley Bike Engine Rings Only
- Compatibility: Ensure rings match your Harley's engine type (e.g., Big Twin, Twin Cam, Evo, M8) and bore size (standard or oversize +0.005/+0.010/+0.020). Use the vehicle selector for model-specific fits to avoid compression loss or rebuild issues.
- Type of Use: For standard rebuilds, choose moly-faced rings for quick seating; high-performance engines benefit from plasma-moly or low-tension rings for reduced friction and better power in demanding conditions.
- Components and Upgrades: Select ring sets for one piston (top, second, oil rings); upgrade to oversize for bored engines or gapless designs for improved sealing.
- Brand and Quality: Opt for Wiseco or Hastings for high-quality moly-faced rings with precise tolerances. Prioritize materials like cast iron or steel for durability and compatibility with forged pistons.
- Installation and Cost: Rings are part of DIY piston installs with basic tools; prices range from $20 for basic sets to $50 for premium oversize—factor in free shipping over $99 and expert support for value.
Frequently Asked Questions (FAQs)
- What Harley models and engines do these rings support? Rings support Big Twin, Twin Cam, Evo, M8, and models like Road King or Heritage Softail—use the year/make/model filter for bore-specific compatibility.
- How do moly-faced rings improve performance? They provide quick break-in, better sealing, and reduced friction for optimal compression and power in rebuilds.
- What is typically included in a ring set? Sets include top, second, and oil rings for one piston; check details for standard vs. oversize and any clips.
- Are these rings suitable for oversize bores? Yes, available in +0.005 to +0.020 oversizes for bored cylinders in performance upgrades.
- What if a ring set doesn't fit my Harley? Verify bore size and engine type before buying. Our returns policy allows exchanges or refunds if it doesn't match.
- Can I find related engine parts? Yes—explore pistons, gaskets, cylinders/heads, or full kits in the Harley engine category to complement your rings for a complete rebuild.
