fits  Royal Enfield: 650 Twin models

865cc kit. Increases bore from stock 78mm to 90mm. 865cc kit. Complete kit that includes big bore cylinder sleeves, big bore pistons, rings, wristpins, wristpin clips and a head gasket. Increases compression ratio from stock 9.5:1 to 11:1.

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Home > Parts > Engine > Top End > Cylinders > S&S, 865cc big bore kit 11:1

fits  Royal Enfield: 650 Twin models

750cc kit. Increases bore from stock 78mm to 83.5mm. Complete kit that includes big bore cylinder sleeves, big bore pistons, rings, wristpins, wristpin clips and a head gasket. Increases compression ratio from stock 9.5:1 to 11:1.

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Home > Parts > Engine > Top End > Cylinders > S&S, 750cc big bore kit 11:1

fits  99-17 95″/103″ Twin Cam (NU)

Quality stock replacement 3-7/8″ (3.875″) bore Twin Cam cylinder. Front & rear cylinders are identical. Dowel pins are included. Cylinders are sold each, without pistons, rings and gaskets. Stock replacement for 103″ Twin Cam (with 4.375″ stroke) and fits as big bore conversion cylinder for 88″ to 95″ bore (with OEM 88″ 4.00″ stroke). Note: Cylinders must be finish bored and honed to fit stock size pistons. Cylinders are sold without pistons and rings.

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Home > Parts > Engine > Top End > Cylinders > Replacement cylinder 95″/103″ Twin Cam, front/rear. Black

fits  99-17 88″/96″ Twin Cam (NU)

Quality stock replacement 3-3/4″ (3.75″) bore Twin Cam cylinder. Front & rear cylinders are identical. Dowel pins are included. Cylinders are sold each, without pistons, rings and gaskets. OEM style replacement for 88″ (4.00″ stroke) and 96″ (with 4.375″ stroke) Twin Cam models. Note: Cylinders are must be finiish bored and honed to fit stock size pistons. Cylinders are sold without pistons and rings.

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Home > Parts > Engine > Top End > Cylinders > Replacement cylinder 88″/96″ Twin Cam, front/rear. Black

fits  17-24 107″ M8 (NU)

Black with highlighted fins. This is a quality 4.25″ bolt-on big bore cylinder kit for 107″ M8 models with stock 3.937″ bore x 4.375″ stroke. Kit can be used with a 4.25″ Wiseco big bore piston kit. Cylinders include dowel pins and are marked for correct front/rear installation. Capacity will increase from stock 107″ (106.52″ / 1746cc) to a hefty 124″ (124.13 / 2034cc) but still installs without crankcase machining. Flywheel re-balancing is not required. Compression ratio is 1:11 and is compatible with the stock camshaft. Includes installation instructions. Note: Order 576555 Wiseco 4.25″ bore conversion pistons & 576556 Wiseco gasket kit separately.

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Home > Parts > Engine > Top End > Cylinders > 107″ to 124″ big bore conversion cylinders for M8

fits  18-24 Softail, 17-24 FLT/Touring; 17-24 Trikes

Black wrinkle finish. Stock length with 4.250″ bore. Provides a massive increase in capacity from 107″ to 124″ (4.375″ stroke), or from 114″/117″ CVO (4.5″ stroke) to 128″ with bolt-on installation ease, no case boring required.

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Home > Parts > Engine > Top End > Cylinders > S&S, 4-1/4″ M8 big bore cylinder set

fits  17-24 107″ M8

Complete bolt-on 2025cc kit. Compatible with stock 107″ engines, which have the required 4.375″ stroke. Converts the 107″ engine to 124″. Incl. black wrinkle cylinders and a forged 4.250″ bore piston & ring kit with 1.143″ deck height and -4.3 cc dish volume for an 11:1 CR with stock cylinder head combustion chamber volume. Incl. all required head & base gaskets and hardware. Provides a massive increase in capacity with bolt-on installation ease, no case boring, head work or flywheel re-balancing required. Note: Compatible with OEM head bolts but S&S advises the, 14% stronger than stock, 576972 S&S head bolt kit for all big bore applications.

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Home > Parts > Engine > Top End > Cylinders > S&S, 107″ to 124″ big bore conversion cylinder & piston kit

fits  17-24 114″ M8

Complete bolt-on 2092cc kit. Compatible with stock 114 engines, which have the required 4.5″ stroke. Converts the 114″ engine to 128″. Incl. black wrinkle cylinders and a forged 4.250″ bore piston & ring kit with 1.0805″ deck height and -7.2 cc dish volume for an 11:1 CR with stock cylinder head combustion chamber volume. Incl. all required head & base gaskets and hardware. Provides a massive increase in capacity with bolt-on installation ease, no case boring, head work or flywheel re-balancing required. Note: S&S advises 576972 S&S head bolt kit for all big bore applications.

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Home > Parts > Engine > Top End > Cylinders > S&S, 114″ to 128″ big bore conversion cylinder & piston kit

fits  84-90 Big Twin; 1986 XL Sportster (NU)

Zinc

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Home > Parts > Engine > Top End > Cylinders > Colony, head bolt washer set. Zinc

fits  40-48 74″/80″ Flathead; 40-57 45″ Flathead. (Alu heads)

Fits Side Valves with aluminum heads. OEM replacement reference 16822-39 (16-39)

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Home > Parts > Engine > Top End > Cylinders > Colony head bolt washer set. Zinc