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Engine & Performance

Choose from Engine & Performance products for Harley-Davidson, American V-twin and compatible motorcycle applications. Across the range you will find products for engine components. Compatibility varies, so match the stated model, year and technical details before ordering.

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£9.08
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James Gaskets Gasket Foot Peg Stud – 1977–1990 XL Sportster

Only 2 left!

James Gaskets Gasket Foot Peg Stud – 1977–1990 XL Sportster Used on inside of inner primary cover. OEM replacement reference 34624-77. Fitment 77-9...

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£276.89
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Jims Twin Cam Handcrafted Tappet Cover Set. Raw Finish – 1999–2017 Twin Cam

Only 2 left!

Jims Twin Cam Handcrafted Tappet Cover Set. Raw Finish – 1999–2017 Twin Cam Raw cut and hand-welded for a tough handcrafted look. Repl. 17964-99 (f...

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£331.47
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Jims Twin Cam Billet Tappet Cover Set. Chrome – 1999–2017 Twin Cam

Only 2 left!

Jims Twin Cam Billet Tappet Cover Set. Chrome – 1999–2017 Twin Cam Chrome plated finish. CNC machined from billet 6061-T6 aluminum with a precision...

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£283.14
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£1,180.01
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Jims Powerglide Tappet & Pushrod Kit. Chrome – 1966–1984 Shovelhead

Out of stock

Jims Powerglide Tappet & Pushrod Kit. Chrome – 1966–1984 Shovelhead Comes with 4 Powerglide big axle tappets that offer superior modern hydraul...

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Jims Tappet Block and Powerglide Tappet Kit. Polished – 1953–1965 Panhead; 1966–1984 Shovelhead

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Jims Tappet Block and Powerglide Tappet Kit. Polished – 1953–1965 Panhead; 1966–1984 Shovelhead This kit has a 3/8" lower seat for the pushrods; re...

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£683.90
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Jims 84-99 Billet Tappet Block Set. Polished – 1984–1999 Evo Big Twin

Out of stock

Jims 84-99 Billet Tappet Block Set. Polished – 1984–1999 Evo Big Twin Manufactured from billet 7075-T651 aluminum. Can be used as a stock replaceme...

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£588.15
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£43.18
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£42.57

Jims Steel Breather Valve Spacers .150" – L1977–1999 Big Twin

Only 2 left!

Jims Steel Breather Valve Spacers .150" – L1977–1999 Big Twin Use with steel breather valves only. Large hole. Used to set correct end play. Note: ...

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Jims Steel Breather Valve Spacers .135" – L1977–1999 Big Twin

Only 2 left!

Jims Steel Breather Valve Spacers .135" – L1977–1999 Big Twin Use with steel breather valves only. Large hole. Used to set correct end play. Note: ...

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Jims Steel Breather Valve Spacers .110" – L1977–1999 Big Twin

Only 2 left!

Jims Steel Breather Valve Spacers .110" – L1977–1999 Big Twin Use with steel breather valves only. Large hole. Used to set correct end play. Note: ...

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£42.57
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£120.82
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£119.14
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Cometic EST Top End Gasket Kit. Twin Cam 3-7/8" Bore – 1999–2017 95"/103" Twin Cam

Out of stock

Cometic EST Top End Gasket Kit. Twin Cam 3-7/8" Bore – 1999–2017 95"/103" Twin Cam With MLS (Multi-Layer-Steel) .045" thick head gaskets. The SLS (...

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£12.24
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James Gaskets Bendix Carburetor Gasket & Seal Kit – 1971–1975 Big Twin; 1972–1976 XL…

Only 3 left!

James Gaskets Bendix Carburetor Gasket & Seal Kit – 1971–1975 Big Twin; 1972–1976 XL… Includes the float bowl gasket 27646-71; manifold to carb...

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Arlen Ness Replacement Spring & O-ring Kit – H-D with Arlen Ness'' 960824; 960825…

Out of stock

Arlen Ness Replacement Spring & O-ring Kit – H-D with Arlen Ness'' 960824; 960825… Replacement O-ring and spring set for 960824; 960825; 960826...

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Arlen Ness Reusable Billet Oil Filter Kit. Deep Cut. Chrome – Most H-D with Screw-on Oil Filter

Out of stock

Arlen Ness Reusable Billet Oil Filter Kit. Deep Cut. Chrome – Most H-D with Screw-on Oil Filter Chrome. Screw-on; re-useable oil filter. Arlen Ness...

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Arlen Ness Stage 2 Big Sucker Air Cleaner Kit. No Cover – 2001–2015 Softail; 1999–2017 Dyna…

Only 2 left!

Arlen Ness Stage 2 Big Sucker Air Cleaner Kit. No Cover – 2001–2015 Softail; 1999–2017 Dyna… - Chrome one-piece billet aluminum backing plate - Wit...

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Arlen Ness Stage 1 Billet Sucker Air Cleaner Kit. Chrome – 2001–2015 Softail; 1999–2017 Dyna…

Out of stock

Arlen Ness Stage 1 Billet Sucker Air Cleaner Kit. Chrome – 2001–2015 Softail; 1999–2017 Dyna… With Scalloped Chrome billet cover. Air filter elemen...

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£304.46
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£205.35
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Arlen Ness 10-Gauge Tappet Block Cover Kit. Black – 1999–2017 Twin Cam; S&S T-series Engines

Out of stock

Arlen Ness 10-Gauge Tappet Block Cover Kit. Black – 1999–2017 Twin Cam; S&S T-series Engines Gloss Black Contrast Machined anodized armor coati...

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£203.79 - £203.79
£203.79
£205.35
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£236.17
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Arlen Ness TC 10-Gauge Pushrod Cover Set. Black – 1999–2017 Twin Cam

Only 2 left!

Arlen Ness TC 10-Gauge Pushrod Cover Set. Black – 1999–2017 Twin Cam Gloss black contrast machined anodized finish. CNC machined 6061-T6 billet alu...

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£234.37
£236.17
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£23.73
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£23.40
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James Gaskets 4-Speed Transmission Mainshaft Seal Kit – 1982–1986 4-Speed Big Twin

Only 3 left!

James Gaskets 4-Speed Transmission Mainshaft Seal Kit – 1982–1986 4-Speed Big Twin Includes all mainshaft & clutch hub nut oil seals. Complete ...

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£23.40
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£67.34
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Riverside Custom Head Bolt Cover Kit. Chrome Aluminum – L1985–2017 Big Twin; 1986–2022 XL…

Only 2 left!

Riverside Custom Head Bolt Cover Kit. Chrome Aluminum – L1985–2017 Big Twin; 1986–2022 XL… Chrome plated machined aluminum construction. Fits over ...

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£66.83
£67.34
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£587.98
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£587.98
£505.65
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Performance Machine ''Max HP'' Air Cleaner Kit. Chrome – CV Carburetor: 1993–2006 All Big Twin…

Out of stock

Performance Machine ''Max HP'' Air Cleaner Kit. Chrome – CV Carburetor: 1993–2006 All Big Twin… Chrome plated finish. - The MAX HP is especially co...

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£587.98
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£505.65
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£748.78
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£643.93
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£643.93

Performance Machine ''FASTair'' Intake, Air Cleaner Kit. Chrome – CV Carburetor: 1993–2006 Big Twin…

Only 3 left!

Performance Machine ''FASTair'' Intake, Air Cleaner Kit. Chrome – CV Carburetor: 1993–2006 Big Twin… Chrome plated finish. The FASTair Intake Solut...

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£748.78
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£643.93
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£748.78
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Performance Machine ''FASTair'' Intake, Air Cleaner Kit. Black CC – CV Carburetor: 1993–2006 Big Twin…

Only 3 left!

Performance Machine ''FASTair'' Intake, Air Cleaner Kit. Black CC – CV Carburetor: 1993–2006 Big Twin… Black anodized with a Contrast Cut machined ...

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£748.78
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£643.93
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£61.40
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MCS Oil Filter Mount Bracket Kit. Black – 1992–1999 Evo Big Twin

Only 3 left!

MCS Oil Filter Mount Bracket Kit. Black – 1992–1999 Evo Big Twin Black wrinkle finish. For OEM steel oil lines. OEM replacement reference 26378-92A...

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£56.51
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MCS Replacement 80" Flathead Piston Kit. Std – 1937–1941 80" (1300cc) 3-7/16" Bore…

Only 3 left!

MCS Replacement 80" Flathead Piston Kit. Std – 1937–1941 80" (1300cc) 3-7/16" Bore… Cast aluminum pistons for a stock 1300cc Side Valve rebuild. Pi...

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£346.03
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