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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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£2.60
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Mikuni Fuel Joint O-Ring

Low stock

Description Mikuni, fuel joint o-ring Product Details Brand: Mikuni Category: INTAKE > CARBS MIKUNI REPL PARTS Unit: 1 Product code: 587106

£2.60
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£2.33
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£7.73
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£6.92
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£6.92

Mikuni Throttle Valve Seal

In stock

Description Mikuni, throttle valve seal Product Details Brand: Mikuni Category: INTAKE > CARBS MIKUNI REPL PARTS Unit: 1 Product code: 587055

£7.73
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£7.73
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£6.92
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£38.04
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Mikuni Rubber Manifold Adapter Hsr42

Low stock

Description Fits HSR42 using stock Mikuni 2-bolt manifold; black rubber flange with worm drive hose clamp Product Details Brand: Mikuni Category...

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£38.04
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£38.04
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£35.16
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£12.81
£14.86
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£14.86

James Gaskets Exhaust Crossover Tube Gasket (2) – 2000–2009 Softail; 2004–2013 XL…

Low stock

Description Fits most models with the stock exhaust crossover (interconnect) tube (also called balance pipe). OEM replacement reference 65927-00 Fi...

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£12.81 - £12.81
£12.81
£14.86
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£14.86
Cometic AFM Primary Cover Gasket .060" thick for 2017 Harley-Davidson Trike and 2017-2021 Harley-Davidson Touring Motorcycles
Sold out
£35.44
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£35.44
£30.12
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£30.12

Cometic Primary Gasket Kit - Each, AFM (Aluminum Foam Material), Primary Cover for Harley-Davidson Touring & Trike 2017-2020

Out of stock

DescriptionPrimary Gasket Kit Cometic's proprietary AFM (Aluminium Foamette Material) gaskets feature an aluminium core with a chemically blown, co...

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£35.44
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£35.44
£30.12
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£30.12
Sold out
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£33.94
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£33.94
£33.61
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£33.61

James Gaskets Gasket Taillight to Lens – 1973–1999 Big Twin; XL Sportster

Low stock

Description Foam. For 73-up style taillight. OEM replacement reference 68025-73; 68027-90 Fitment 73-99 Big Twin; XL Sportster (NU) Product Details...

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£33.94
£33.61
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£33.61
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£33.11
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£32.79
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£32.79

James Gaskets Gasket Inner Primary Cover. Rcm – 1995–2006 Softail; Dyna

Low stock

Description RCM (Rubber Coated Metal). Used on primary inside to seal-off the stand-off studs for the outer primary cover. Repl. 63859-95A; 63859-9...

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£33.11
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£33.11
£32.79
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£32.79
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£37.31
£37.75
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£37.75

James Gaskets Manifold Intake Seals. Blue Viton +.180" – 1984–2017 Big Twin; 1986–2022 XL…

Low stock

Description Blue Viton. +.180" wider for stroker motors with longer cylinders. Used between manifold and cylinder head. OEM replacement reference 2...

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£37.31
£37.75
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£37.75
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£35.00
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£35.00
£34.83
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James Gaskets Gasket Transmission End Cover. Foamet – 2007–2024 Softail; 2006–2017 Dyna…

Low stock

Description Foamet (Foam Covered Metal). OEM replacement reference 36805-06. James'' Foamet gasket material has an aluminum core with a nitrile syn...

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£35.00
£34.83
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£18.05
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£18.05
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£16.68

Kibblewhite Kpmi, Wrist Pin Bushings. Std – 1936–1999 Big Twin

Low stock

Description Replacement Kibblewhite Precision Machining piston pin bushings; manufactured from 100% machined SAE660 bearing bronze. Fitment 36-99 B...

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£18.05
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£18.05
£16.68
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£16.68
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£35.16
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Kibblewhite Kpmi, Exhaust Valve Guide. C630 Bronze. Std – 1984–1999 Evo Big Twin; 1999–2004 Twin…

Low stock

Description C630 bearing bronze. Size: 0.5620" O.D. (14.27mm); 0.3090" I.D. (7.85mm); 2.00" OAL (50.8mm). Comes with special shoulder for ease of i...

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Kibblewhite Kpmi, Intake Valve Guide. C630 Bronze. Std – 1984–1999 Evo Big Twin; 1999–2004 Twin…

Low stock

Description C630 bearing bronze. Size: 0.5620" O.D. (14.27mm); 0.3090" I.D. (7.85mm); 2.00" OAL (50.8mm). Comes with special shoulder for ease of i...

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£34.43
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£34.43
£34.09
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James Gaskets Oil Seal ''Super Nut'' – 1936–1986 4-Speed Big Twin

In stock

Description Replacement oil seal for the imported 501790 & James 501791 ''Super Nut'' style transmission mainshaft seal nuts. OEM replacement r...

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£34.43
£34.09
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£16.10
£18.69
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£18.69

James Gaskets O-Ring Derby Cover – 1999–2005 Dyna; 1999–2006 Softail…

Low stock

Description OEM replacement reference 25416-99; 25416-99A. Fitment 99-05 Dyna; 99-06 Softail; FLT/Touring (NU) Product Details Brand: James Gaske...

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£16.10
£18.69
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£18.69
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£5.76
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James Gaskets Oil Seal, Transmission Shifter Shaft / Clutch Release – Shifter: L1979–1984 Big Twin; 1986–2005…

In stock

Description 1 used behind shifter lever on transmission. OEM replacement reference 37101-84; 37101-84A; 37101-84B. Fitment Shifter: L79-84 Big Twin...

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£5.76 - £5.76
£5.76
£6.45
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£4.64
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£4.64

James Gaskets O-Ring, Pushrod Cover / Dipstick / Oil Pump – Dipstick Cover; Upper (1 Used):…

Low stock

Description Pushrod middle & o-ring oil filler plug transmission. OEM replacement reference 11132; 11132A. Fitment Dipstick cover; upper (1 use...

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£4.86
£4.64
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£44.84
£45.38
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£45.38

James Gaskets Manifold Intake Seals. Band Style – L1978–1984 Big Twin; 1979–1985 XL…

In stock

Description Used between manifold and cylinder head. OEM replacement reference 27062-78. Fitment L78-84 Big Twin; 79-85 XL Sportster (NU) Product D...

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£44.84
£45.38
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£9.29
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£9.29
£8.89
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£8.89

James Gaskets O-Ring Intake Manifold / Solenoid – Intake: 1957–1978 XL Sportster; 55-E78…

Low stock

Description Nitrile rubber. Used between the manifold and cylinder head or for the starter solenoid. OEM replacement reference 27060-55. Fitment In...

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£9.29
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£9.29
£8.89
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£32.91
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MCS 57-85 XL Tappet Adjusting Screw Kit – 1957–1985 XL Sportster

Low stock

Description With 5/16" ball-end. 9/32"-32 threaded. Fits OEM 18508-52B and any other adjustable tappets with 9/32"-32 threads. Repl. 18554-57. Note...

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£32.61
£32.91
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£26.95
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£26.95
£20.10
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£20.10

MCS Exhaust Insulating Wrap. 2" Wide Black

Low stock

Description Fiberglass exhaust wrap sold in 50ft. (15 meter) long rolls of 1.5mm thick material. Withstands heat up to 1200 °F (649 °C) continues; ...

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£26.95
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£26.95
£20.10
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£20.10
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£30.78
£31.18
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£31.18

MCS Lock Nuts, for Tappet Adjuster Screw – 1915–1985 All H-D

Low stock

Description 9/32"-32 threaded. Fits all tappets that take 9/32-32 threaded adjusting screws. Replaces OEM 18570-38. Note: For adjusting screws see ...

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£30.78
£31.18
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£11.96
£13.87
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£13.87

James Gaskets O-Ring, Pushrod Upper / Oil Filter, Oil Pump – Upper O-Ring Pushrod Cover: 1999–2017…

Low stock

Description OEM replacement reference 11293. Fitment Upper O-ring pushrod cover: 99-17 Twin Cam; 17-25 M8. O-ring; between oil filter housing &...

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£11.96 - £11.96
£11.96
£13.87
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£13.87
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£83.39
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£83.39
£78.65
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£78.65

MCS Breather Style Air Cleaner Assembly, Oval. Chrome – 1990–2017 Big Twin; 1988–2022 XL…

Low stock

Description Classic steel mesh air cleaner for that authentic high performance look. Dimensions approx.: 7" (17.8cm) wide x 4-1/2" (11.5cm) high x ...

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£83.39
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£83.39
£78.65
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£78.65
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£52.56
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£44.91
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MCS Monster-Show Petcock, Hex Body. Down Outlet – 1966–1974 Big Twin; 1957–1974 Sportster…

Low stock

Description Chrome; down outlet; For 1/4" (6.4mm) fuel hose; with filter & reserve; 3/8 NPT threaded. Why not have a custom petcock that looks ...

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