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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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£39.24
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Cometic 5-Speed Transmission Gasket & Seal Kit – 2000–2006 Softail; 1999–2006 FLT/Touring

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Cometic 5-Speed Transmission Gasket & Seal Kit – 2000–2006 Softail; 1999–2006 FLT/Touring Everything you need when assembling the transmission....

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£37.36
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£67.66
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£64.42
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£64.42

Cometic 5-Speed Transmission Gasket & Seal Kit – 1993–1998 FLT/Touring; 1993–1999 Softail

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Cometic 5-Speed Transmission Gasket & Seal Kit – 1993–1998 FLT/Touring; 1993–1999 Softail Everything you need when assembling the transmission....

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£67.66
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£67.66
£64.42
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£46.66
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£44.43
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£44.43

Cometic Transmission Gasket & Seal Kit – 1991–1998 Dyna

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Cometic Transmission Gasket & Seal Kit – 1991–1998 Dyna Everything you need when assembling the transmission. OEM replacement reference 33031-9...

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£46.66
£44.43
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£44.43
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£83.31
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£83.31
£80.43
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£80.43

Cometic 5-Speed Transmission Gasket & Seal Kit – L1982–1992 Big Twin 5-Speed Big Twin

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Cometic 5-Speed Transmission Gasket & Seal Kit – L1982–1992 Big Twin 5-Speed Big Twin Everything you need when assembling the transmission. OEM...

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£83.31
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£83.31
£80.43
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£72.17
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£72.17
£68.71
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£68.71

Cometic 5-Speed Transmission Gasket & Seal Kit – 80-E84 5-Speed Big Twin

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Cometic 5-Speed Transmission Gasket & Seal Kit – 80-E84 5-Speed Big Twin Everything you need when assembling the transmission. OEM replacement ...

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£72.17
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£72.17
£68.71
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£68.71
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£56.27
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£56.27
£53.58
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£53.58

Cometic 4-Speed Transmission Gasket & Seal Kit – L1979–1982 4-Speed Big Twin

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Cometic 4-Speed Transmission Gasket & Seal Kit – L1979–1982 4-Speed Big Twin Everything you need when assembling the transmission. Fitment L79-...

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£56.27
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£56.27
£53.58
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£60.18
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£60.18
£57.29
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£57.29

Cometic 4-Speed Transmission Gasket & Seal Kit – E70-E79 4-Speed Big Twin

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Cometic 4-Speed Transmission Gasket & Seal Kit – E70-E79 4-Speed Big Twin Everything you need when assembling the transmission. Fitment E70-E79...

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£60.18
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£60.18
£57.29
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£57.29
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£51.20
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£51.20
£48.75
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£48.75

Cometic Cylinder Head Gaskets 3-7/8" Bore .027" MLS – 2014–2016 FLT/Touring 103" Twin Cooled

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Cometic Cylinder Head Gaskets 3-7/8" Bore .027" MLS – 2014–2016 FLT/Touring 103" Twin Cooled MLS (Multi Layer Steel). Front & rear gasket for o...

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£51.20
£48.75
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£48.75
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£54.36
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£54.36
£51.76
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£51.76

Cometic EST Rocker Cover Gasket Kit. Evo XL – 2007–2022 XL Sportster

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Cometic EST Rocker Cover Gasket Kit. Evo XL – 2007–2022 XL Sportster Kit for two cylinders. EST''s embossed stainless steel metal substrate is coat...

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£54.36
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£54.36
£51.76
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£51.76
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£37.77
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£37.77
£35.96
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£35.96

Cometic Rocker Cover Gasket Kit. Twin Cam. Standard – 1999–2017 Twin Cam

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Cometic Rocker Cover Gasket Kit. Twin Cam. Standard – 1999–2017 Twin Cam Includes rocker cover gaskets & pushrod seals. With 99-10 and 11-17 st...

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£37.77
£37.77 - £37.77
£37.77
£35.96
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£35.96
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£54.36
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£54.36
£51.76
£51.76 - £51.76
£51.76

Cometic EST Rocker Cover Gasket Kit. Evo XL – 2004–2006 XL Sportster

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Cometic EST Rocker Cover Gasket Kit. Evo XL – 2004–2006 XL Sportster Kit for two cylinders. EST''s embossed stainless steel metal substrate is coat...

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£54.36
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£54.36
£51.76
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£51.76
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£54.36
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£54.36
£51.76
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£51.76

Cometic EST Rocker Cover Gasket Kit. Evo XL – 1991–2003 XL Sportster

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Cometic EST Rocker Cover Gasket Kit. Evo XL – 1991–2003 XL Sportster Kit for two cylinders. EST''s embossed stainless steel metal substrate is coat...

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£54.36
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£54.36
£51.76
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£51.76
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£54.36
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£54.36
£51.76
£51.76 - £51.76
£51.76

Cometic EST Rocker Cover Gasket Kit. Evo XL – 1986–1990 XL Sportster

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Cometic EST Rocker Cover Gasket Kit. Evo XL – 1986–1990 XL Sportster Kit for two cylinders. EST''s embossed stainless steel metal substrate is coat...

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£54.36
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£54.36
£51.76
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£51.76
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£54.36
£54.36 - £54.36
£54.36
£51.76
£51.76 - £51.76
£51.76

Cometic EST Rocker Cover Gasket Kit. Evo Big Twin – 1992–1999 Evo Big Twin

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Cometic EST Rocker Cover Gasket Kit. Evo Big Twin – 1992–1999 Evo Big Twin Kit for two cylinders. EST''s embossed stainless steel metal substrate i...

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£54.36
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£54.36
£51.76
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£51.76
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£54.36
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£54.36
£51.76
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£51.76

Cometic EST Rocker Cover Gasket Kit. Evo Big Twin – 1984–1991 Evo Big Twin

Out of stock

Cometic EST Rocker Cover Gasket Kit. Evo Big Twin – 1984–1991 Evo Big Twin Kit for two cylinders. EST''s embossed stainless steel metal substrate i...

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£54.36
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£54.36
£51.76
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£51.76
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£62.23
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£62.23
£59.25
£59.25 - £59.25
£59.25

Cometic Top-end Gasket Kit. XL1000 Low CR – 1982–1985 XL1000

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Cometic Top-end Gasket Kit. XL1000 Low CR – 1982–1985 XL1000 With .063" low compression copper cylinder head gaskets and .031" copper cylinder base...

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£62.23
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£62.23
£59.25
£59.25 - £59.25
£59.25
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£62.23
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£62.23
£59.25
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£59.25

Cometic Top End Gasket Kit. XL1000 – 1977–1985 XL1000

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Cometic Top End Gasket Kit. XL1000 – 1977–1985 XL1000 With .032" copper cylinder head gaskets and .031" copper cylinder base gaskets. Kit includes ...

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£62.23
£62.23 - £62.23
£62.23
£59.25
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£59.25
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£62.23
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£62.23
£59.25
£59.25 - £59.25
£59.25

Cometic Top End Gasket Kit. XL1000 – L1973–1976 XL1000

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Cometic Top End Gasket Kit. XL1000 – L1973–1976 XL1000 With .032" copper cylinder head gaskets and .031" copper cylinder base gaskets. Kit includes...

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£62.23
£62.23 - £62.23
£62.23
£59.25
£59.25 - £59.25
£59.25
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£62.23
£62.23 - £62.23
£62.23
£59.25
£59.25 - £59.25
£59.25

Cometic Top-end Gasket Kit. XL1000 – 72-E73 XL1000

Out of stock

Cometic Top-end Gasket Kit. XL1000 – 72-E73 XL1000 With .032" copper cylinder head gaskets and .031" copper cylinder base gaskets. Kit includes all...

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£62.23
£62.23 - £62.23
£62.23
£59.25
£59.25 - £59.25
£59.25
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£62.23
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£62.23
£59.25
£59.25 - £59.25
£59.25

Cometic Top-end Gasket Kit. XL900 – 1957–1971 XL900

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Cometic Top-end Gasket Kit. XL900 – 1957–1971 XL900 With .032" copper cylinder head gaskets and .031" copper cylinder base gaskets. Kit includes al...

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£62.23
£62.23 - £62.23
£62.23
£59.25
£59.25 - £59.25
£59.25
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£115.11
£115.11 - £115.11
£115.11
£113.51
£113.51 - £113.51
£113.51

Cometic EST Top End Gasket Kit. XL1200 – 1991–2003 XL1200

Out of stock

Cometic EST Top End Gasket Kit. XL1200 – 1991–2003 XL1200 With 3.50" bore MLS (Multi-Layer-Steel) .030" thick head gaskets. SLS (Single-Layer-Steel...

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£115.11
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£115.11
£113.51
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£113.51
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£108.53
£108.53 - £108.53
£108.53
£107.02
£107.02 - £107.02
£107.02

Cometic EST Top End Gasket Kit. Shovel 3-5/8" Big Bore – 1966–1984 Shovelhead with 3-5/8" Big…

Only 3 left!

Cometic EST Top End Gasket Kit. Shovel 3-5/8" Big Bore – 1966–1984 Shovelhead with 3-5/8" Big… With 3.625" bore MLS (Multi-Layer-Steel) .040" thick...

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£108.53
£108.53 - £108.53
£108.53
£107.02
£107.02 - £107.02
£107.02
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£108.53
£108.53 - £108.53
£108.53
£107.02
£107.02 - £107.02
£107.02

Cometic EST Top End Gasket Kit. Shovel 3-13/16" Big Bore – 1966–1984 Shovelhead with 3-13/16" Big…

Out of stock

Cometic EST Top End Gasket Kit. Shovel 3-13/16" Big Bore – 1966–1984 Shovelhead with 3-13/16" Big… With 3.812" bore MLS (Multi-Layer-Steel) .040" t...

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£108.53
£108.53 - £108.53
£108.53
£107.02
£107.02 - £107.02
£107.02
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£115.11
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£115.11
£113.51
£113.51 - £113.51
£113.51

Cometic EST Top End Gasket Kit. XL1200 – 2004–2006 XL1200

Only 1 left!

Cometic EST Top End Gasket Kit. XL1200 – 2004–2006 XL1200 With 3.50" bore MLS (Multi-Layer-Steel) .040" thick head gaskets. SLS (Single-Layer-Steel...

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£115.11
£115.11 - £115.11
£115.11
£113.51
£113.51 - £113.51
£113.51
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