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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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£27.71
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Cometic Cylinder Base Gasket Set. SLS 4" Big Bore – 1984–1999 Evo Big Twin with S&S & TP 4"…

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Cometic Cylinder Base Gasket Set. SLS 4" Big Bore – 1984–1999 Evo Big Twin with S&S & TP 4"… Front & rear gasket for one engine. .020" ...

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£27.71
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£26.38

Cometic Cylinder Base Gasket Set. SLS 4" Big Bore – 1984–1999 Evo Big Twin with S&S & TP 4"…

Out of stock

Cometic Cylinder Base Gasket Set. SLS 4" Big Bore – 1984–1999 Evo Big Twin with S&S & TP 4"… Front & rear gasket for one engine. .010" ...

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£27.71
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Cometic Cylinder Base Gasket Set. SLS 3-13/16" Big Bore – 1984–1999 Evo Big Twin with 3-13/16" Big…

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Cometic Cylinder Base Gasket Set. SLS 3-13/16" Big Bore – 1984–1999 Evo Big Twin with 3-13/16" Big… Front & rear gasket for one engine. .020" t...

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£26.38
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£27.71
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£27.71
£26.38
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£26.38

Cometic Cylinder Base Gasket Set. SLS 3-13/16" Big Bore – 1984–1999 Evo Big Twin with 3-13/16" Big…

Only 2 left!

Cometic Cylinder Base Gasket Set. SLS 3-13/16" Big Bore – 1984–1999 Evo Big Twin with 3-13/16" Big… Front & rear gasket for one engine. .010" t...

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£51.20
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£51.20
£48.75
£48.75 - £48.75
£48.75

Cometic Cylinder Head Gasket Set. 4-1/8" .040" MLS – 1984–1999 Evo Big Twin with TP…

Only 2 left!

Cometic Cylinder Head Gasket Set. 4-1/8" .040" MLS – 1984–1999 Evo Big Twin with TP… .040" thick MLS (Multi Layer Steel). Consists of a top and bot...

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£48.75
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£51.20
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£48.75
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£48.75

Cometic Cylinder Head Gasket Set. 4-1/8" .036" MLS – 1984–1999 Evo Big Twin with TP…

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Cometic Cylinder Head Gasket Set. 4-1/8" .036" MLS – 1984–1999 Evo Big Twin with TP… .036" thick MLS (Multi Layer Steel). Consists of a top and bot...

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£51.20
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£48.75
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£48.75
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£51.20
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£51.20
£48.75
£48.75 - £48.75
£48.75

Cometic Cylinder Head Gasket Set. 4-1/8" .030" MLS – 1984–1999 Evo Big Twin with TP…

Only 2 left!

Cometic Cylinder Head Gasket Set. 4-1/8" .030" MLS – 1984–1999 Evo Big Twin with TP… .030" thick MLS (Multi Layer Steel). Consists of a top and bot...

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£51.20
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£51.20
£48.75
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£48.75
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£51.20
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£48.75
£48.75 - £48.75
£48.75

Cometic Cylinder Head Gasket Set. 4-1/8" .027" MLS – 1984–1999 Evo Big Twin with TP…

Only 2 left!

Cometic Cylinder Head Gasket Set. 4-1/8" .027" MLS – 1984–1999 Evo Big Twin with TP… .027" thick MLS (Multi Layer Steel). Consists of a top and bot...

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£48.75
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£51.20
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£48.75
£48.75 - £48.75
£48.75

Cometic Cylinder Head Gasket Set. 4.00" .040" MLS – 1984–1999 Evo Big Twin (S&S & TP 4" Big…

Out of stock

Cometic Cylinder Head Gasket Set. 4.00" .040" MLS – 1984–1999 Evo Big Twin (S&S & TP 4" Big… .040" thick MLS (Multi Layer Steel). Consists ...

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£51.20
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£51.20
£48.75
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£48.75
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£51.20
£51.20 - £51.20
£51.20
£48.75
£48.75 - £48.75
£48.75

Cometic Cylinder Head Gasket Set. 4.00" .030" MLS – 1984–1999 Evo Big Twin (S&S & TP 4" Big…

Only 2 left!

Cometic Cylinder Head Gasket Set. 4.00" .030" MLS – 1984–1999 Evo Big Twin (S&S & TP 4" Big… .030" thick MLS (Multi Layer Steel). Consists ...

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£51.20
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£51.20
£48.75
£48.75 - £48.75
£48.75
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£51.20
£51.20 - £51.20
£51.20
£48.75
£48.75 - £48.75
£48.75

Cometic Cylinder Head Gasket Set. 4.00" .025" MLS – 1984–1999 Evo Big Twin

Out of stock

Cometic Cylinder Head Gasket Set. 4.00" .025" MLS – 1984–1999 Evo Big Twin .025" thick MLS (Multi Layer Steel). Consists of a top and bottom layer ...

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£51.20
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£51.20
£48.75
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£48.75
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£5.52
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£5.52
£5.08
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£5.08

Cometic O-ring Drain/Dipstick & Oil Pump Plugs – Crankcase; Drain Plug (1 Used):…

Out of stock

Cometic O-ring Drain/Dipstick & Oil Pump Plugs – Crankcase; Drain Plug (1 Used):… Multi-application. OEM replacement reference 11105 Fitment Cr...

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£5.52
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£5.52
£5.08
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£5.08
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£8.01
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£8.01
£7.37
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£7.37

Cometic Gasket Inner Primary to Transmission. Fiber – 1979–1984 FLT/Touring; 1982–1984 FXR

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Cometic Gasket Inner Primary to Transmission. Fiber – 1979–1984 FLT/Touring; 1982–1984 FXR Fiber. The ''small'' gasket. OEM replacement reference 3...

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£8.01
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£8.01
£7.37
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£7.37
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£26.91
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£26.91
£25.62
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£25.62

Cometic Gasket Primary Inspection Cover. .060" AFM – 2004–2022 XL Sportster; 2008–2012 XR1200

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Cometic Gasket Primary Inspection Cover. .060" AFM – 2004–2022 XL Sportster; 2008–2012 XR1200 .060" thick AFM (Aluminum Foamet Material). OEM repla...

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£26.91
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£26.91
£25.62
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£25.62
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£6.44
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£6.44
£5.92
£5.92 - £5.92
£5.92

Cometic O-ring Clutch Gear – 1967–1970 XLH; 1970 XLCH

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Cometic O-ring Clutch Gear – 1967–1970 XLH; 1970 XLCH In transmission. OEM replacement reference 11119. Fitment 67-70 XLH; 1970 XLCH (NU) Product D...

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£6.44
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£6.44
£5.92
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£5.92
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£4.79
£4.79 - £4.79
£4.79
£4.40
£4.40 - £4.40
£4.40

Cometic O-ring Clutch Gear – L1957–1966 XL Sportster; XLH; XLCH…

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Cometic O-ring Clutch Gear – L1957–1966 XL Sportster; XLH; XLCH… In transmission. OEM replacement reference 11103. Fitment L57-66 XL Sportster; XLH...

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£4.79
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£4.79
£4.40
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£4.40
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£103.63
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£103.63
£100.05
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£100.05

Cometic Gasket Primary Cover. .060" AFM – 1952–1956 K; KH; 1957–1969 XLH; XLCH

Out of stock

Cometic Gasket Primary Cover. .060" AFM – 1952–1956 K; KH; 1957–1969 XLH; XLCH .060" thick AFM (Aluminum Foamet Material). OEM replacement referenc...

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£103.63
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£103.63
£100.05
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£100.05
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£7.80
£7.80 - £7.80
£7.80
£7.18
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£7.18

Cometic Gasket Wire/Oil Strainer. Cork – 1957–1976 XL Sportster; XLCH; XLH…

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Cometic Gasket Wire/Oil Strainer. Cork – 1957–1976 XL Sportster; XLCH; XLH… OEM replacement reference 24978-57. Fitment 57-76 XL Sportster; XLCH; X...

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£7.80
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£7.80
£7.18
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£7.18
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£5.45
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£5.45
£5.01
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£5.01

Cometic O-ring Tappet Guide – 1957–1985 XL Sportster

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Cometic O-ring Tappet Guide – 1957–1985 XL Sportster OEM replacement reference 11100. Fitment 57-85 XL Sportster (NU) Product Details Brand: Come...

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£5.45
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£5.45
£5.01
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£11.56
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£11.56
£11.00
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£11.00

Cometic Rocker Cover Gaskets. .020" Paper – 1957–1985 XL Sportster

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Cometic Rocker Cover Gaskets. .020" Paper – 1957–1985 XL Sportster .020" thick paper. Replacement for OEM 17536-70 Fitment 57-85 XL Sportster (NU) ...

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£11.56
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£11.56
£11.00
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£11.00
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£40.31
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£40.31
£38.38
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£38.38

Cometic Square O-ring Ring Derby Cover – 1994–2022 XL Sportster; 2008–2012 XR1200

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Cometic Square O-ring Ring Derby Cover – 1994–2022 XL Sportster; 2008–2012 XR1200 OEM style square seal. OEM replacement reference 25463-94A. Fitme...

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£40.31
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£40.31
£38.38
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£38.38
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£9.69
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£9.69
£8.92
£8.92 - £8.92
£8.92

Cometic O-ring Filler / Chain Inspection Cap Primary – 1991–2003 XL Sportster

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Cometic O-ring Filler / Chain Inspection Cap Primary – 1991–2003 XL Sportster OEM replacement reference 11188. Fitment 91-03 XL Sportster (NU) Prod...

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£9.69
£8.92
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£8.92
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£12.30
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£12.30
£11.71
£11.71 - £11.71
£11.71

Cometic O-ring Tappet Guide. Lower – 1986–1990 4-Speed XL Sportster

Out of stock

Cometic O-ring Tappet Guide. Lower – 1986–1990 4-Speed XL Sportster OEM replacement reference 11168; 11168A. Fitment 86-90 4-speed XL Sportster (NU...

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£12.30
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£11.71
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£12.30
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£12.30
£11.71
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£11.71

Cometic Tappet Guide O-ring. Upper – 1986–1990 XL Sportster 4-Speed

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Cometic Tappet Guide O-ring. Upper – 1986–1990 XL Sportster 4-Speed Used between tappet guide and crankcase. OEM replacement reference 11167; 11167...

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£11.71
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