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Engine - Engine Performance Kits

Explore engine performance kits within the engine range, with products grouped for motorcycle servicing, repair and custom work. Current products cover engine components, depending on the specification and application. Confirm model coverage, key measurements and any supporting parts required on the individual listing.

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S&S Cycle 128" Power Package for 2017-2025 Harley-Davidson Performance Kit Black Granite Highlighted Fins
£3,428.27 - £3,428.27
£3,428.27
£3,428.27 - £3,428.27
£3,428.27

S&S Cycle 128" Power Package - Kit - Black Granite / Highlighted Fins for Harley-Davidson Touring & Trike 2017-2025

In stock

Description128" Power Package 114" to 128" big bore kit; 114" and 117" CVO to 128" big bore kit Bolt-in kit, case maching not required Forged pisto...

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£3,428.27 - £3,428.27
£3,428.27
£3,428.27 - £3,428.27
£3,428.27
S&S Cycle 124" Power Package for 2017-2025 Harley-Davidson Performance Kit Black Non-Highlighted Fins Big Bore
£3,639.48 - £3,639.48
£3,639.48
£3,639.48 - £3,639.48
£3,639.48

S&S Cycle 124" Power Package - Big Bore, Kit - Black / Non-Highlighted Fins for Harley-Davidson Touring, Softail, Dyna & Trike 2017-2025

Low stock

Description124" Power Package Bolt-on kit With updated fins No case machining required Forged pistons Made in the USA Includes oil pump/cam plate, ...

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£3,639.48 - £3,639.48
£3,639.48
£3,639.48 - £3,639.48
£3,639.48
S&S Cycle 124" Power Package for 2017-2025 Harley-Davidson Performance Kit Black Highlighted Fins Big Bore
£3,639.48 - £3,639.48
£3,639.48
£3,639.48 - £3,639.48
£3,639.48

S&S Cycle 124" Power Package - Big Bore, Kit - Black / Highlighted Fins for Harley-Davidson Touring, Softail, Dyna & Trike 2017-2025

Low stock

Description124" Power Package Bolt-on kit With updated fins No case machining required Forged pistons Made in the USA Includes oil pump/cam plate, ...

View full details
£3,639.48 - £3,639.48
£3,639.48
£3,639.48 - £3,639.48
£3,639.48
S&S Cycle 124" Power Package for 2017-2025 Harley-Davidson Performance Kit Black Granite Highlighted Fins Big Bore
£3,639.48 - £3,639.48
£3,639.48
£3,639.48 - £3,639.48
£3,639.48

S&S Cycle 124" Power Package - Big Bore, Kit - Black Granite / Highlighted Fins for Harley-Davidson Touring, Softail, Dyna & Trike 2017-2025

Low stock

Description124" Power Package Bolt-on kit With updated fins No case machining required Forged pistons Made in the USA Includes oil pump/cam plate, ...

View full details
£3,639.48 - £3,639.48
£3,639.48
£3,639.48 - £3,639.48
£3,639.48
S&S Cycle 124" Power Package for 2017-2025 Harley-Davidson Performance Kit Black Non-Highlighted Fins Big Bore
£3,428.27 - £3,428.27
£3,428.27
£3,428.27 - £3,428.27
£3,428.27

S&S Cycle 124" Power Package - Kit, Big Bore - Black / Non-Highlighted Fins for Harley-Davidson Touring, Softail, Dyna & Trike 2017-2025

In stock

Description124" Power Package Bolt-on kit With updated fins No case machining required Forged pistons Made in the USA Includes oil pump/cam plate, ...

View full details
£3,428.27 - £3,428.27
£3,428.27
£3,428.27 - £3,428.27
£3,428.27
S&S Cycle 124" Power Package for 2017-2025 Harley-Davidson Performance Kit Highlighted Fins Wrinkle Black 550C
£3,398.09 - £3,398.09
£3,398.09
£3,398.09 - £3,398.09
£3,398.09

S&S Cycle 124" Power Package - 550C, Kit - Highlighted Fins / Wrinkle Black for Harley-Davidson Touring, Softail, Dyna & Trike 2017-2025

In stock

Description124" Power Package Bolt-on kit Updated fins No case machining required Forged pistons Made in the USA Includes oil pump/cam plate, pushr...

View full details
£3,398.09 - £3,398.09
£3,398.09
£3,398.09 - £3,398.09
£3,398.09
S&S Cycle 124" Power Package for 2017-2025 Harley-Davidson Performance Kit Black Granite Highlighted Fins Big Bore
£3,428.27 - £3,428.27
£3,428.27
£3,428.27 - £3,428.27
£3,428.27

S&S Cycle 124" Power Package - Kit, Big Bore - Black Granite / Highlighted Fins for Harley-Davidson Touring, Softail, Dyna & Trike 2017-2025

Low stock

Description124" Power Package Bolt-on kit With updated fins No case machining required Forged pistons Made in the USA Includes oil pump/cam plate, ...

View full details
£3,428.27 - £3,428.27
£3,428.27
£3,428.27 - £3,428.27
£3,428.27
S&S Cycle 128" Power Package for 2017-2025 Harley-Davidson Performance Kit Black Non-Highlighted Fins
Sold out
£3,600.99 - £3,600.99
£3,600.99
£3,600.99 - £3,600.99
£3,600.99

S&S Cycle 128" Power Package - Kit - Black / Non-Highlighted Fins for Harley-Davidson Touring, Softail, Dyna & Trike 2017-2025

Out of stock

Description128" Power Package 114" to 128" big bore kit; 114" and 117" CVO to 128" big bore kit Bolt-in kit, case maching not required Forged pisto...

View full details
£3,600.99 - £3,600.99
£3,600.99
£3,600.99 - £3,600.99
£3,600.99
Sold out
S&S Cycle 128" Power Package for 2017-2025 Harley-Davidson Performance Kit Black Highlighted Fins
Sold out
£3,600.99 - £3,600.99
£3,600.99
£3,600.99 - £3,600.99
£3,600.99

S&S Cycle 128" Power Package - Kit - Black / Highlighted Fins for Harley-Davidson Touring, Softail, Dyna & Trike 2017-2025

Out of stock

Description128" Power Package 114" to 128" big bore kit; 114" and 117" CVO to 128" big bore kit Bolt-in kit, case maching not required Forged pisto...

View full details
£3,600.99 - £3,600.99
£3,600.99
£3,600.99 - £3,600.99
£3,600.99
Sold out
S&S Cycle 128" Power Package for 2017-2025 Harley-Davidson Performance Kit Black Non-Highlighted Fins
£3,398.09 - £3,398.09
£3,398.09
£3,398.09 - £3,398.09
£3,398.09

S&S Cycle 128" Power Package - Kit - Black / Non-Highlighted Fins for Harley-Davidson Touring, Softail, Dyna & Trike 2017-2025

In stock

Description128" Power Package 114" to 128" big bore kit; 114" and 117" CVO to 128" big bore kit Bolt-in kit, case maching not required Forged pisto...

View full details
£3,398.09 - £3,398.09
£3,398.09
£3,398.09 - £3,398.09
£3,398.09
S&S Cycle 128" Power Package for 2017-2025 Harley-Davidson Performance Kit Black Highlighted Fins
£3,398.09 - £3,398.09
£3,398.09
£3,398.09 - £3,398.09
£3,398.09

S&S Cycle 128" Power Package - Kit - Black / Highlighted Fins for Harley-Davidson Touring, Softail, Dyna & Trike 2017-2025

Low stock

Description128" Power Package 114" to 128" big bore kit; 114" and 117" CVO to 128" big bore kit Bolt-in kit, case maching not required Forged pisto...

View full details
£3,398.09 - £3,398.09
£3,398.09
£3,398.09 - £3,398.09
£3,398.09
S&S Cycle 128" Power Package for 2017-2025 Harley-Davidson Performance Kit Black Granite Highlighted Fins
Sold out
£3,398.09 - £3,398.09
£3,398.09
£3,398.09 - £3,398.09
£3,398.09

S&S Cycle 128" Power Package - Kit - Black Granite / Highlighted Fins for Harley-Davidson Touring, Softail, Dyna & Trike 2017-2025

Out of stock

Description128" Power Package 114" to 128" big bore kit; 114" and 117" CVO to 128" big bore kit Bolt-in kit, case maching not required Forged pisto...

View full details
£3,398.09 - £3,398.09
£3,398.09
£3,398.09 - £3,398.09
£3,398.09
Sold out
S&S Cycle Big Bore Kit for 2019-2021, 2023 ROYAL ENFIELD
£958.13 - £958.13
£958.13
£958.13 - £958.13
£958.13

S&S Cycle Big Bore Kit for 2019-2021, 2023 ROYAL ENFIELD #920-0144

In stock

DescriptionBig Bore KitIncreases bore from stockIncrease compression ratio from 9.5:1 to 11.0:1Kit includes cylinder sleeves, pistons and head gask...

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£958.13 - £958.13
£958.13
£958.13 - £958.13
£958.13
S&S Cycle Big Bore Kit
£789.93 - £789.93
£789.93
£789.93 - £789.93
£789.93

S&S Cycle Big Bore Kit #920-0145

In stock

DescriptionBig Bore KitIncreases bore from stockIncrease compression ratio from 9.5:1 to 11.0:1Kit includes cylinder sleeves, pistons and head gask...

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£789.93 - £789.93
£789.93
£789.93 - £789.93
£789.93
S&S Cycle Power Package - 128" Water Cooled, Gear Drive, Black Granite w/ Highlighted Fins and Chrome Pushrod Tubes for Various Various Harley-Davidson Motorcycles (See Fitment List)
£3,243.44 - £3,243.44
£3,243.44
£3,712.84
£3,712.84 - £3,712.84
£3,712.84

S&S Cycle Power PK GR M8 BKG WTR for Harley-Davidson Touring & Trike 2017-2023

Low stock

Description114" to 128" Big Bore KitFitment 2021-2023 Harley Davidson FLHTCUTG 1868 ABS Tri Glide Ultra 114 2019-2023 Harley Davidson FLHTK 1868 AB...

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£3,243.44 - £3,243.44
£3,243.44
£3,712.84
£3,712.84 - £3,712.84
£3,712.84
S&S Cycle Power Package - 128" Water Cooled, Gear Drive, Wrinkle Black w/ NON-Highlighted Fins and Chrome Pushrod Tubes for Various Various Harley-Davidson Motorcycles (See Fitment List)
Save 8% Save %
£3,817.01
£3,817.01 - £3,817.01
£3,817.01
£3,495.53
£3,495.53 - £3,495.53
£3,495.53

S&S Cycle Power PK GR M8 BLK OIL for Harley-Davidson Touring, Softail, Dyna & Trike 2018-2025

Low stock

Description114" to 128" Big Bore KitFitment 2018-2024 Harley Davidson FLFBS 1868 ABS Softail Fat Boy 114 2018 Harley Davidson FLFBS 1868 ABS Softai...

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£3,817.01
£3,817.01 - £3,817.01
£3,817.01
£3,495.53
£3,495.53 - £3,495.53
£3,495.53
Save 8% Save %
S&S Cycle Hooligan Engine Performance Kit Hooligan™ Wrinkle Black Big Bore
£1,689.75 - £1,689.75
£1,689.75
£1,689.75 - £1,689.75
£1,689.75

S&S Cycle Hooligan Engine Performance Kit - Big Bore - Wrinkle Black for Harley-Davidson Sportster 2000-2022

In stock

DescriptionHooligan Engine Performance Kit Bolt on big bore kits mean easy installation with no machining and no rebalancing S&S bolt-in cams a...

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£1,689.75 - £1,689.75
£1,689.75
£1,689.75 - £1,689.75
£1,689.75
S&S Cycle Sidewinder® Big Bore Stroker Engine Performance Kit Black
£4,682.02 - £4,682.02
£4,682.02
£4,682.02 - £4,682.02
£4,682.02

S&S Cycle Sidewinder® Big Bore Stroker Engine Performance Kit - Black for Harley-Davidson Touring, Softail, Dyna & FXR 1970-1984

Low stock

DescriptionSidewinder® Big Bore Stroker Engine Performance Kit Sidewinder Big Bore Stroker Kit Contains nearly everything needed to take a stock 74...

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£4,682.02 - £4,682.02
£4,682.02
£4,682.02 - £4,682.02
£4,682.02
S&S Cycle 106" Hot Set Up® Engine Performance Kit Wrinkle Black Big Bore
Sold out
£2,230.70 - £2,230.70
£2,230.70
£2,230.70 - £2,230.70
£2,230.70

S&S Cycle 106" Hot Set Up® Engine Performance Kit - Big Bore - Wrinkle Black for Harley-Davidson Touring, Softail & Dyna 2007-2017

Out of stock

Description106" Hot Set Up® Engine Performance Kit Increased fin area for better heat dissipation Increase bore size from 3.750" to 3.927" 4.375" s...

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£2,230.70 - £2,230.70
£2,230.70
£2,230.70 - £2,230.70
£2,230.70
Sold out
S&S Cycle 96" Sidewinder® Engine Performance Kit Wrinkle Black Big Bore
£2,531.01 - £2,531.01
£2,531.01
£2,531.01 - £2,531.01
£2,531.01

S&S Cycle 96" Sidewinder® Engine Performance Kit - Big Bore - Wrinkle Black for Harley-Davidson Touring, Softail, Dyna & FXR 1985-1999

In stock

Description96" Sidewinder® Engine Performance Kit Kit includes standard flywheel assembly, 3.625" Sidewinder® stroker big bore cylinder, 9.75:1 com...

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£2,531.01 - £2,531.01
£2,531.01
£2,531.01 - £2,531.01
£2,531.01
S&S Cycle 124" Hot Set Up® Engine Performance Kit Powder Coated Wrinkle Black Big Bore
£7,392.44 - £7,392.44
£7,392.44
£7,392.44 - £7,392.44
£7,392.44

S&S Cycle 124" Hot Set Up® Engine Performance Kit - Big Bore - Powder Coated / Wrinkle Black for Harley-Davidson Softail 2000-2006

Low stock

Description124" Hot Set Up® Engine Performance Kit For balanced Twin Cam models Converts a stock engine to 124" using the stock crankcases Includes...

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£7,392.44 - £7,392.44
£7,392.44
£7,392.44 - £7,392.44
£7,392.44
S&S Cycle 124" Hot Set Up® Engine Performance Kit Powder Coated Wrinkle Black Big Bore
£7,392.44 - £7,392.44
£7,392.44
£7,392.44 - £7,392.44
£7,392.44

S&S Cycle 124" Hot Set Up® Engine Performance Kit - Big Bore - Powder Coated / Wrinkle Black for Harley-Davidson Touring, Softail, Dyna & Trike 2006-2017

Low stock

Description124" Hot Set Up® Engine Performance Kit For non-balanced Twin Cam models Converts a stock engine to 124" using the stock crankcases Incl...

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£7,392.44 - £7,392.44
£7,392.44
£7,392.44 - £7,392.44
£7,392.44
Trask Tornado Turbo Performance Kit Polished
£7,549.18 - £7,549.18
£7,549.18
£7,549.18 - £7,549.18
£7,549.18

Trask Tornado Turbo Performance Kit - Turbo Tornado M8 Pol/ss - Polished for Harley-Davidson Touring, Softail, Dyna & Trike 2017-2024

In stock

DescriptionTornado Turbo Performance Kit Bolt on 40%-50% more power for stock 107", 114" and 117" M-Eight motors Trask compressor and turbine housi...

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£7,549.18 - £7,549.18
£7,549.18
£7,549.18 - £7,549.18
£7,549.18
Trask Tornado Turbo Performance Kit Black
£7,549.18 - £7,549.18
£7,549.18
£7,549.18 - £7,549.18
£7,549.18

Trask Tornado Turbo Performance Kit - Turbo Tornado M8 CHM - Black for Harley-Davidson Touring, Softail, Dyna & Trike 2017-2024

Low stock

DescriptionTornado Turbo Performance Kit Bolt on 40%-50% more power for stock 107", 114" and 117" M-Eight motors Trask compressor and turbine housi...

View full details
£7,549.18 - £7,549.18
£7,549.18
£7,549.18 - £7,549.18
£7,549.18

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