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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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£35.88
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Colony Rocker Shaft End Plug Set. Hex Style. Chrome – 1971–1984 Shovelhead; 1971–1985 XL…

Only 2 left!

Colony Rocker Shaft End Plug Set. Hex Style. Chrome – 1971–1984 Shovelhead; 1971–1985 XL… Chrome plated. Custom Hex styled. Complete set to fit the...

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£35.88
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£35.88
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£35.45
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£9.22
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£7.95
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£7.95

MCS 3-Piece Muffler Id Reducer Sleeve Set – Exhaust

Only 3 left!

MCS 3-Piece Muffler Id Reducer Sleeve Set – Exhaust 3-piece slip-fit sleeves are used to reduce the inner muffler diameter from 1-3/4" (44.5mm) to ...

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£9.22
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£374.60
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£369.39
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£369.39

Manley Race Master Valve Kit. Stock - .650" Valve Lift – 2005–2017 Twin Cam

Only 2 left!

Manley Race Master Valve Kit. Stock - .650" Valve Lift – 2005–2017 Twin Cam Titanium top collars. Standard size replacement; installs without machi...

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£374.60
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£374.60
£369.39
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£369.39
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£244.72
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£244.72
£241.32
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£241.32

Manley Valve Spring Kit. Titanium. Std to .650" Lift – 2005–2017 Twin Cam A/B; 2004–2022 XL…

Only 2 left!

Manley Valve Spring Kit. Titanium. Std to .650" Lift – 2005–2017 Twin Cam A/B; 2004–2022 XL… Includes titanium top collars; steel lower; reverse wo...

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£244.72
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£244.72
£241.32
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£241.32
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£211.71
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£211.71
£208.76
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£208.76

Manley Valve Spring Kit. Steel. Std to .600" Lift – 2005–2017 Twin Cam A/B; 2004–2022 XL…

Only 3 left!

Manley Valve Spring Kit. Steel. Std to .600" Lift – 2005–2017 Twin Cam A/B; 2004–2022 XL… Includes steel top collars; steel lowers; a beehive style...

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£211.71
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£211.71
£208.76
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£208.76
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£97.80
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£97.80
£93.12
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£93.12

Manley Severe Duty Stainless Valve, Intake. Oversize – 1984–1999 Evo Big Twin; 1999–2004 Twin…

Only 2 left!

Manley Severe Duty Stainless Valve, Intake. Oversize – 1984–1999 Evo Big Twin; 1999–2004 Twin… Standard size replacement with oversized head. Dimen...

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£97.80
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£97.80
£93.12
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£93.12
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£97.80
£97.80 - £97.80
£97.80
£93.12
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£93.12

Manley Severe Duty Stainless Valve, Intake. STD – 1984–1999 Evo Big Twin; 1999–2004 Twin…

Only 2 left!

Manley Severe Duty Stainless Valve, Intake. STD – 1984–1999 Evo Big Twin; 1999–2004 Twin… Standard size replacement. Dimensions: 1.85" head dia. x ...

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£97.80
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£97.80
£93.12
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£93.12
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£364.90
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£364.90
£359.82
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£359.82

Manley Race Master Valve Kit. .550" - .650" Valve Lift – 1984–1999 Evo Big Twin

Only 2 left!

Manley Race Master Valve Kit. .550" - .650" Valve Lift – 1984–1999 Evo Big Twin Titanium top collars; high lift. Standard size replacement; install...

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£364.90
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£364.90
£359.82
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£359.82
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£204.71
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£204.71
£173.08
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£173.08

MCS 2" Drag Pipe Slip-on Extension Set Chrome – 2004–2013 XL Sportster

Only 3 left!

MCS 2" Drag Pipe Slip-on Extension Set Chrome – 2004–2013 XL Sportster Extension set; 19-3/4" (50.2 cm) long; with slash cut ends that are angled d...

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£204.71
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£204.71
£173.08
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£173.08
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£690.74
£696.04
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£696.04

Paughco Shorty Exhaust (38"). Chrome – 1984–1994 FXR

Only 2 left!

Paughco Shorty Exhaust (38"). Chrome – 1984–1994 FXR Slider channels. Bolts to stock hanger bracket up to 1992. Heatshield front 902387; rear 90349...

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£690.74 - £690.74
£690.74
£696.04
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£696.04
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£54.57
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£54.57
£49.60
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£49.60

Colony Shovel Rocker Box Top Nut Kit. Chrome, Cap Style – 1966–1984 Shovelhead

Only 3 left!

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

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£54.57
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£54.57
£49.60
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£49.60
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£42.21 - £42.21
£42.21
£42.53
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£42.53

James Gaskets Gasket Set Cylinder Base. .031" Foamet – 1963–1984 Big Twin

Only 3 left!

James Gaskets Gasket Set Cylinder Base. .031" Foamet – 1963–1984 Big Twin .031" thick Foamet (Foam Coated Metal). Final crush .025". OEM replacemen...

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£42.21
£42.53
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£42.53
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£8.11
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£8.11
£7.00
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£7.00

MCS Replacement Fuel Filter Element

Only 1 left!

MCS Replacement Fuel Filter Element Fits 900154/50/68/72 style alu fuel filters Product Details Brand: MCS Category: GAS TANKS > FUEL FILTERS...

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£8.11
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£8.11
£7.00
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£7.00
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£42.21 - £42.21
£42.21
£42.53
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£42.53

James Gaskets Gasket Set, Cylinder Base. 3-5/8" Bore. .020" RCM – 1963–1984 Big Twin with 3-5/8" Big Bore…

Only 2 left!

James Gaskets Gasket Set, Cylinder Base. 3-5/8" Bore. .020" RCM – 1963–1984 Big Twin with 3-5/8" Big Bore… 3-5/8" big bore. .022" RCM (Rubber Coate...

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£42.21
£42.53
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£42.53
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James Gaskets Cylinder Base. RCM .022" – 1984–1999 Big Twin; 1986–2022 XL…

Only 3 left!

James Gaskets Cylinder Base. RCM .022" – 1984–1999 Big Twin; 1986–2022 XL… .022" thick RCM (Rubber Covered Metal). Final crush .020". With silicone...

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£42.21 - £42.21
£42.21
£42.53
£42.53 - £42.53
£42.53
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£42.21
£42.53
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£42.53

James Gaskets Cylinder Base Gasket Set. .022" RCM. 3-5/8" Bore – 1984–1999 Evo Big Twin; 1986–2022 XL…

Only 3 left!

James Gaskets Cylinder Base Gasket Set. .022" RCM. 3-5/8" Bore – 1984–1999 Evo Big Twin; 1986–2022 XL… 3-5/8" big bore. .022" RCM (Rubber Coated Me...

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£42.21 - £42.21
£42.21
£42.53
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£42.53
£42.21 - £42.21
£42.21
£42.53
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£42.53

James Gaskets Cylinder Base. RCM .022" – 1984–1999 Evo Big Twin

Only 4 left!

James Gaskets Cylinder Base. RCM .022" – 1984–1999 Evo Big Twin .022" RCM (Rubber Coated Metal). Type ''A''. Final crush .020". James'' RCM gaskets...

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£42.21 - £42.21
£42.21
£42.53
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£42.53
Sold out
£690.74 - £690.74
£690.74
£696.04
£696.04 - £696.04
£696.04

Paughco Tapered Exhaust (38"). Chrome – 1986–2003 XL Sportster

Out of stock

Paughco Tapered Exhaust (38"). Chrome – 1986–2003 XL Sportster Slider channel on front pipe. Incl. 902839 brake stop / exh. hanger bracket. Heatshi...

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£690.74 - £690.74
£690.74
£696.04
£696.04 - £696.04
£696.04
Sold out
£58.44 - £58.44
£58.44
£58.89
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£58.89

James Gaskets Upper Rocker Cover Gasket. Rubber – 1986–1990 XL Sportster

Only 3 left!

James Gaskets Upper Rocker Cover Gasket. Rubber – 1986–1990 XL Sportster OEM replacement reference 17354-86A Fitment 86-90 XL Sportster (NU) Produc...

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£58.44 - £58.44
£58.44
£58.89
£58.89 - £58.89
£58.89
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£184.21
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£184.21
£158.10
£158.10 - £158.10
£158.10

MCS Fat Bob Gas Tank, 5 Gallon – 1936–1984 FL; FX

Only 3 left!

MCS Fat Bob Gas Tank, 5 Gallon – 1936–1984 FL; FX For use with 83-up screw style gas caps. Stock style replacement Fat Bob style gas tank that fits...

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£184.21
£184.21 - £184.21
£184.21
£158.10
£158.10 - £158.10
£158.10
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£765.73 - £765.73
£765.73
£771.61
£771.61 - £771.61
£771.61

Paughco Shotgun Tapered Exhaust (38"). Chrome – 1984–1999 Softail

Out of stock

Paughco Shotgun Tapered Exhaust (38"). Chrome – 1984–1999 Softail Mounts to stock bracket up to 1994. Incl. include Paughco 718H10 and 718I1 mounti...

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£765.73 - £765.73
£765.73
£771.61
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£771.61
Sold out
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£765.73
£771.61
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£771.61

Paughco Shotgun Shorty Exhaust (38"). Chrome – 1984–1999 Softail

Only 2 left!

Paughco Shotgun Shorty Exhaust (38"). Chrome – 1984–1999 Softail Incl. Paughco 718H10 and 718I1 mounting brackets. Heatshield front 902387; rear 90...

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£765.73 - £765.73
£765.73
£771.61
£771.61 - £771.61
£771.61
Sold out
£765.73 - £765.73
£765.73
£771.61
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£771.61

Paughco Tapered Exhaust (38"). Chrome – 1984–1999 Softail

Out of stock

Paughco Tapered Exhaust (38"). Chrome – 1984–1999 Softail Slider channels. Incl. 500191 mount bracket. Mounts to stock hanger bracket up to 1994. H...

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£765.73 - £765.73
£765.73
£771.61
£771.61 - £771.61
£771.61
Sold out
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£152.07
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£152.07
£149.94
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£149.94

Jims Sprocket Shaft. 57-76 XL – 1957–1976 XL Sportster

Only 3 left!

Jims Sprocket Shaft. 57-76 XL – 1957–1976 XL Sportster Fits with OEM flywheels. Sprocket shaft has keyway; use 23985-12 key (MCS 517945). Use nut (...

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£152.07
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£152.07
£149.94
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£149.94
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