Collection:
KB Pistons
52 productsCreated from a high-silicon aluminum alloy, KB Performance pistons are lightweight to improve throttle response and RPM changes while still retaining incredible strength. Browse the range below!
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FXR
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Front Suspension: 35 & 39mm
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Front Suspension: 41mm
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Front Suspension: 49mm
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XL'79-03
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Windshields & Luggage
Std Flat Top Pistons with 11:1 Compression Ratio. Fits Milwaukee-Eight 2017up with Big Bore 114ci & 117ci to 120ci Conversion.
Regular price
$1,083.99
Sale price
$1,083.99
Regular price
Unit price
/per
Features & Benefits:-
* Super Duty KB Forged Coated Anodized Piston Kit.
* Big bore 120″ piston kit for Milwaukee 8.
* Factory 114″ and 117″ cylinders are used to bore to 4.125″.
* No head m...
Std Flat Top Pistons with 8.6:1 Compression Ratio. Fits Big Twin 1984-1999 with Evo Engine.
Regular price
$612.99
Sale price
$612.99
Regular price
Unit price
/per
Features & Benefits:-
* Bore = 3.498″
* Stroke = 4.250″
* Hypereutectic Alloy is a cast 16% silicon content material.
* Perfect for air cooled engines.
* Low thermal expansion rate = tighter p...
Std Flat Top Pistons with 9.0:1 Compression Ratio. Fits Sportster 1986-2021 with 1200cc Engine & Sportster 1986-1987 with 1100cc Engine.
Regular price
$596.99
Sale price
$596.99
Regular price
Unit price
/per
* Bore=3.498″ – Stroke=3.812
* Hypereutectic Alloy is a cast 16% silicon content material
* Perfect for air cooled engines
* Low thermal expansion rate = tighter piston-to-cylinder clearance
Tech ...
Sold Out
Std Flat Top Pistons with 9.3:1 Compression Ratio. Fits Twin Cam 1999-2006 with Big Bore 88ci to 95ci Conversion.
Regular price
$765.99
Sale price
$765.99
Regular price
Unit price
/per
Features & Benefits:-
* Bore = 3.875″
* Stroke = 4.000″
* Hypereutectic Alloy is a cast 16% silicon content material.
* Perfect for air cooled engines.
* Low thermal expansion rate = tighter p...
Std Pistons with 11.4:1 Compression Ratio. Fits Milwaukee-Eight 2017up with Big Bore 107ci to 124ci 4.250in. Cylinders.
Regular price
$1,136.99
Sale price
$1,136.99
Regular price
Unit price
/per
Features & Benefits:-
* Super Duty KB Forged Coated Anodized Piston Kit.
* 107ci to Big bore 124″ piston kit for Milwaukee 8 when using 4.250″ Bore Cylinders
* No head modification required
...
Std Pistons with 11.7:1 Compression Ratio. Fits Milwaukee-Eight 2017up with Big Bore 114 or 117ci to 128ci 4.250in. Cylinders.
Regular price
$1,136.99
Sale price
$1,136.99
Regular price
Unit price
/per
Features & Benefits:-
* Super Duty KB Forged Coated Anodized Piston Kit.
* 114 or 117ci to Big bore 128″ piston kit for Milwaukee 8 when using 4.250″ Bore Cylinders
* No head modification req...
Sold Out
Std Pistons with 8.5:1 Compression Ratio. Fits Big Twin 1941-1979 with 1200cc Engine.
Regular price
$628.99
Sale price
$628.99
Regular price
Unit price
/per
Features & Benefits:-
* Bore = 3.437″
* Stroke = 3.969″
* Hypereutectic Alloy is a cast 16% silicon content material.
* Perfect for air cooled engines.
* Low thermal expansion rate = tighter ...
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