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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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£49.79
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MCS Big Twin Plain Heat Shield Set Black – 1984–2009 Softail; 1984–1994 FXR…

Only 3 left!

MCS Big Twin Plain Heat Shield Set Black – 1984–2009 Softail; 1984–1994 FXR… Smooth style front and rear heat shield set. Fits front & rear hea...

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£49.79
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£49.79
£42.53
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£162.05
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£144.05

Jims 15-73 Tappet Adjusting Screw Kit – 1915-1973 45"; 74"; 80" Flatheads…

Only 2 left!

Jims 15-73 Tappet Adjusting Screw Kit – 1915-1973 45"; 74"; 80" Flatheads… 9/32-32 threaded. Fits as stock replacement and all other tappets that a...

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£162.05
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£67.93
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Jims 57-85 Tappet Adjusting Screws – 1957–1985 XL Sportster with 9/32-32…

Only 2 left!

Jims 57-85 Tappet Adjusting Screws – 1957–1985 XL Sportster with 9/32-32… With 5/16" ball-end. 9/32"-32 threaded. Fits JIMS; OEM 18508-52B and any ...

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£67.93
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£67.93
£62.19
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£114.16
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£102.99
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Jims 36-52 Chromoly Tappet Adjusting Screw Kit – 1936–1947 Knucklehead; 1948–1952…

Out of stock

Jims 36-52 Chromoly Tappet Adjusting Screw Kit – 1936–1947 Knucklehead; 1948–1952… 4340 chromoly steel. With 3/8" ball end and 9/32"-32 threaded. O...

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£114.16
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£102.99
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£204.32
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£178.91
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Jims 4340 Chromoly Steel Tappet Screws. Special – 1936–1952 Knuckle; Panhead and All…

Only 2 left!

Jims 4340 Chromoly Steel Tappet Screws. Special – 1936–1952 Knuckle; Panhead and All… 4340 chromoly steel. Screw has oil hole drilled through the c...

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£204.32
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£44.58
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Jims 29-85 Tappet Roller Repair Kit – 1929–1985 All H-D

Only 3 left!

Jims 29-85 Tappet Roller Repair Kit – 1929–1985 All H-D Complete reproduction tappet rollers with needle bearings and axles. Repl. 18534-29A. Tech ...

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£44.35
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£48.30
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James Gaskets Evo Cyl. Head & Base Gasket Kit. .062" Firering – 1984–1999 Evo Big Twin; 1986–2022 Evo XL…

Only 3 left!

James Gaskets Evo Cyl. Head & Base Gasket Kit. .062" Firering – 1984–1999 Evo Big Twin; 1986–2022 Evo XL… 3-5/8" big bore. Kit to service one e...

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£48.30
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£48.30
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£38.87
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MCS Gas Cap Set, Screw-in – 1996–1999 H-D

Only 3 left!

MCS Gas Cap Set, Screw-in – 1996–1999 H-D Chromed steel; Vented + Non-vented; Right + left side Fitment 96-99 H-D (NU) Product Details Brand: MCS...

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£344.60
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MCS Amen Style Ribbed Gas Tank, 2.35 Gallon – 1984–1999 Softail; 1985–1986 FXWG

Only 3 left!

MCS Amen Style Ribbed Gas Tank, 2.35 Gallon – 1984–1999 Softail; 1985–1986 FXWG Resembles a Sportster tank from a distance; but it isn''t. With the...

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£282.00
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£300.92
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£264.99
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MCS Bobber Sportster Style 2.25G Gas Tank, Scalloped Sides – 1983–2003 XL Sportster; Various Custom…

Only 1 left!

MCS Bobber Sportster Style 2.25G Gas Tank, Scalloped Sides – 1983–2003 XL Sportster; Various Custom… Small tank with scalloped sides for a true cus...

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£300.92
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£264.99
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£171.81
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Jims 36-52 Crankpin. STD – 1936–1947 61" (1000cc) Knuckle…

Only 3 left!

Jims 36-52 Crankpin. STD – 1936–1947 61" (1000cc) Knuckle… Standard O.D. 1.249". 1-hole design for stock flywheels. Use JIMS 978250 crankpin nuts a...

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£142.23
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MCS 84-99 Tappet Block Set Front/Rear. Black – 1984–1999 Evo Big Twin

Only 1 left!

MCS 84-99 Tappet Block Set Front/Rear. Black – 1984–1999 Evo Big Twin Black painted cast aluminum lifter block set. OEM style. Repl. 18622-85B rear...

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£142.23
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£142.23
£123.78
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£197.92
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£173.31
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£173.31

MCS 84-99 Tappet Block Set Front/Rear. Chrome – 1984–1999 Evo Big Twin

Only 3 left!

MCS 84-99 Tappet Block Set Front/Rear. Chrome – 1984–1999 Evo Big Twin Chrome plated cast aluminum lifter block set. OEM style. Repl. 18622-85B rea...

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£197.92
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£197.92
£173.31
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£173.31
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£33.30
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MCS Keyless Push Button Fuel Door Release. Black – 2008–2025 Touring; 2009–2026 Trikes.…

Only 3 left!

MCS Keyless Push Button Fuel Door Release. Black – 2008–2025 Touring; 2009–2026 Trikes.… Black. Replaces the stock key-operated 61029-92A fuel door...

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£30.65
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£332.51
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£277.95
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MCS Flatside Stretched Gas Tank, 5 Gallon – 1984–1999 Softail; 1985–1986 FXWG

Only 3 left!

MCS Flatside Stretched Gas Tank, 5 Gallon – 1984–1999 Softail; 1985–1986 FXWG Fits 84-99 Softail and 85-86 FXWG models. Will take the stock 83-up s...

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£332.51
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£332.51
£277.95
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£636.40
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£547.30
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£547.30

MCS Custom Gas Tank, One Piece 5.1 Gallon – 2000–2005 Softail Carburetor Models

Only 2 left!

MCS Custom Gas Tank, One Piece 5.1 Gallon – 2000–2005 Softail Carburetor Models 5.1 gallon capacity. Takes stock 83-up style gas caps. Note: Does n...

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£636.40
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£636.40
£547.30
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£547.30
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James Gaskets Top End Gasket Kit. XL1000 – L1973–1985 XL1000

Only 4 left!

James Gaskets Top End Gasket Kit. XL1000 – L1973–1985 XL1000 With 0.016" copper cylinder head gaskets; 0.030" paper cylinder base gaskets. Includes...

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£44.67
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James Gaskets Keihin CV Carb Rebuild Kit – 1990–2006 Big Twin; 1988–2006 XL…

Only 2 left!

James Gaskets Keihin CV Carb Rebuild Kit – 1990–2006 Big Twin; 1988–2006 XL… Genuine James rebuild kit for all OEM Keihin CV (Constant Vacuum) carb...

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£58.10
£58.55
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James Gaskets Keihin Butterfly Carb Rebuild Kit – 1976–1989 Big Twin; 1979–1987 XL…

Only 3 left!

James Gaskets Keihin Butterfly Carb Rebuild Kit – 1976–1989 Big Twin; 1979–1987 XL… Genuine James extensive rebuild kit for all OEM Keihin butterfl...

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£64.58 - £64.58
£64.58
£65.08
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£65.08
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£35.77
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£35.33
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£35.33

Colony Rocker Shaft Plug Set. Knuckle Style. Chrome – 66-E71 Shovelhead; 57-E71 XL Sportster

Only 2 left!

Colony Rocker Shaft Plug Set. Knuckle Style. Chrome – 66-E71 Shovelhead; 57-E71 XL Sportster Chrome plated. Styled after the Knucklehead rocker nut...

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Colony Rocker Shaft End Plug Set. Knuckle Style. Chrome – 1971–1984 Shovelhead; 1971–1985 XL…

Only 3 left!

Colony Rocker Shaft End Plug Set. Knuckle Style. Chrome – 1971–1984 Shovelhead; 1971–1985 XL… Chrome plated. Knucklehead styled plugs. Complete set...

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£49.22
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Colony Shovel Rocker Box Top Nut Kit. Chrome, Acorn – 1966–1984 Shovelhead

Only 3 left!

Colony Shovel Rocker Box Top Nut Kit. Chrome, Acorn – 1966–1984 Shovelhead Chrome plated. Includes 18 custom acorn nuts; washers and 4 rocker shaft...

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£95.12
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Colony B.T. Ribbed Lower Pushrod Cover Set. Chrome – 1948–1965 Panhead; 66-E79 Shovelhead

Only 3 left!

Colony B.T. Ribbed Lower Pushrod Cover Set. Chrome – 1948–1965 Panhead; 66-E79 Shovelhead Chrome plated steel; custom ribbed; lower pushrod covers....

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MCS By-pass Kit, Vacuum Petcock

Only 4 left!

MCS By-pass Kit, Vacuum Petcock Not happy with the H-D vacuum controlled petcock? Install this kit and your petcock will be manually operated. Incl...

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