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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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£143.08
£143.08 - £143.08
£143.08
£141.09
£141.09 - £141.09
£141.09

Cometic Motor Only Gasket Set. XL Sportster – 1977–1985 XL Sportster (HIGH C.R.)

Only 2 left!

Cometic Motor Only Gasket Set. XL Sportster – 1977–1985 XL Sportster (HIGH C.R.) With .032" copper head gaskets & .031" base gaskets. 3.425" bo...

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£143.08
£143.08 - £143.08
£143.08
£141.09
£141.09 - £141.09
£141.09
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£125.13
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£125.13
£123.39
£123.39 - £123.39
£123.39

Cometic Motor Only Gasket Set. XL Sportster – L1973–1976 XL1000

Only 2 left!

Cometic Motor Only Gasket Set. XL Sportster – L1973–1976 XL1000 With .032" copper head gaskets & .031" base gaskets. 3.425" bore. Complete kit ...

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£125.13
£125.13 - £125.13
£125.13
£123.39
£123.39 - £123.39
£123.39
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£127.40
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£127.40
£125.63
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£125.63

Cometic Motor Only Gasket Set. XL Sportster – 72-E73 XL1000

Only 2 left!

Cometic Motor Only Gasket Set. XL Sportster – 72-E73 XL1000 With .032" copper head gaskets & .031" base gaskets. 3.425" bore. Complete kit with...

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£127.40
£127.40 - £127.40
£127.40
£125.63
£125.63 - £125.63
£125.63
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£149.21
£149.21 - £149.21
£149.21
£147.14
£147.14 - £147.14
£147.14

Cometic Motor Only Gasket Set. XL Sportster – 1957–1971 XL900

Only 2 left!

Cometic Motor Only Gasket Set. XL Sportster – 1957–1971 XL900 With .032" copper head gaskets & .031" base gaskets. 3.250" bore. Complete kit wi...

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£149.21
£149.21 - £149.21
£149.21
£147.14
£147.14 - £147.14
£147.14
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£183.29
£183.29 - £183.29
£183.29
£180.74
£180.74 - £180.74
£180.74

Cometic EST Top End Gasket Kit. XL883 – 2007–2022 XL883

Only 2 left!

Cometic EST Top End Gasket Kit. XL883 – 2007–2022 XL883 With 3.00" bore MLS (Multi-Layer-Steel) .040" thick head gaskets. SLS (Single-Layer-Steel) ...

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£183.29
£183.29 - £183.29
£183.29
£180.74
£180.74 - £180.74
£180.74
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£183.26
£183.26 - £183.26
£183.26
£180.71
£180.71 - £180.71
£180.71

Cometic EST Top End Gasket Kit. XL883 – 2004–2006 XL883

Only 2 left!

Cometic EST Top End Gasket Kit. XL883 – 2004–2006 XL883 With 3.00" bore MLS (Multi-Layer-Steel) .040" thick head gaskets. SLS (Single-Layer-Steel) ...

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£183.26
£183.26 - £183.26
£183.26
£180.71
£180.71 - £180.71
£180.71
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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 – 2007–2022 XL1200

Only 1 left!

Cometic EST Top End Gasket Kit. XL1200 – 2007–2022 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
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£113.51
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£168.11
£168.11 - £168.11
£168.11
£165.77
£165.77 - £165.77
£165.77

Cometic EST Motor Gasket Kit. 3-7/8" Big Bore – 1999–2005 Dyna; 2000–2006 Softail…

Only 2 left!

Cometic EST Motor Gasket Kit. 3-7/8" Big Bore – 1999–2005 Dyna; 2000–2006 Softail… This EST (Extreme-Sealing-Technology) gasket set is complete wit...

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£168.11
£168.11 - £168.11
£168.11
£165.77
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£165.77
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£161.17
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£161.17
£158.93
£158.93 - £158.93
£158.93

Cometic EST Motor Gasket Kit – 2004–2006 XL1200

Only 2 left!

Cometic EST Motor Gasket Kit – 2004–2006 XL1200 This EST (Extreme-Sealing-Technology) gasket set is complete with all gaskets; seals and o-rings th...

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£161.17
£161.17 - £161.17
£161.17
£158.93
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£158.93
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£161.18
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£161.18
£158.94
£158.94 - £158.94
£158.94

Cometic EST Motor Gasket Kit – 2002–2005 Buell Firebolt XB9R; XB9RS

Out of stock

Cometic EST Motor Gasket Kit – 2002–2005 Buell Firebolt XB9R; XB9RS This EST (Extreme-Sealing-Technology) gasket set is complete with all gaskets; ...

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£161.18
£161.18 - £161.18
£161.18
£158.94
£158.94 - £158.94
£158.94
Sold out
£214.58 - £214.58
£214.58
£216.23
£216.23 - £216.23
£216.23

Cometic EST Motor Gasket Kit – 1991–2003 XL1200

Only 2 left!

Cometic EST Motor Gasket Kit – 1991–2003 XL1200 This EST (Extreme-Sealing-Technology) gasket set is complete with all gaskets; seals and o-rings th...

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£214.58 - £214.58
£214.58
£216.23
£216.23 - £216.23
£216.23
£197.84 - £197.84
£197.84
£199.36
£199.36 - £199.36
£199.36

Cometic EST Motor Gasket Kit – 1991–2003 XL883

Only 2 left!

Cometic EST Motor Gasket Kit – 1991–2003 XL883 This EST (Extreme-Sealing-Technology) gasket set is complete with all gaskets; seals and o-rings tha...

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£197.84 - £197.84
£197.84
£199.36
£199.36 - £199.36
£199.36
£202.97 - £202.97
£202.97
£204.53
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£204.53

Cometic EST Motor Gasket Kit – 1988–1990 XL1200 4-Speed

Only 2 left!

Cometic EST Motor Gasket Kit – 1988–1990 XL1200 4-Speed This EST (Extreme-Sealing-Technology) gasket set is complete with all gaskets; seals and o-...

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£202.97 - £202.97
£202.97
£204.53
£204.53 - £204.53
£204.53
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£161.17
£161.17 - £161.17
£161.17
£158.93
£158.93 - £158.93
£158.93

Cometic EST Motor Gasket Kit – 1986–1987 XL1100 4-Speed

Only 2 left!

Cometic EST Motor Gasket Kit – 1986–1987 XL1100 4-Speed This EST (Extreme-Sealing-Technology) gasket set is complete with all gaskets; seals and o-...

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£161.17
£161.17 - £161.17
£161.17
£158.93
£158.93 - £158.93
£158.93
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£193.34
£193.34 - £193.34
£193.34
£190.65
£190.65 - £190.65
£190.65

Cometic EST Motor Gasket Kit – 1986–1990 XL883 4-Speed

Only 2 left!

Cometic EST Motor Gasket Kit – 1986–1990 XL883 4-Speed This EST (Extreme-Sealing-Technology) gasket set is complete with all gaskets; seals and o-r...

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£193.34
£193.34 - £193.34
£193.34
£190.65
£190.65 - £190.65
£190.65
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Sold out
£217.46 - £217.46
£217.46
£219.13
£219.13 - £219.13
£219.13

Cometic EST Motor Gasket Kit. 3-3/4" Bore – 1999–2006 FLT/Touring; Road King

Out of stock

Cometic EST Motor Gasket Kit. 3-3/4" Bore – 1999–2006 FLT/Touring; Road King This EST (Extreme-Sealing-Technology) gasket set is complete with all ...

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£217.46 - £217.46
£217.46
£219.13
£219.13 - £219.13
£219.13
Sold out
Sold out
£221.09 - £221.09
£221.09
£222.79
£222.79 - £222.79
£222.79

Cometic EST Motor Gasket Kit. 3-3/4" Bore – 1999–2005 Dyna; 2000–2006 Softail

Out of stock

Cometic EST Motor Gasket Kit. 3-3/4" Bore – 1999–2005 Dyna; 2000–2006 Softail This EST (Extreme-Sealing-Technology) gasket set is complete with all...

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£221.09 - £221.09
£221.09
£222.79
£222.79 - £222.79
£222.79
Sold out
£273.75 - £273.75
£273.75
£275.86
£275.86 - £275.86
£275.86

Cometic EST Motor Gasket Kit. 3-1/2" Bore – 1992–1999 Evo 1340cc Big Twin

Only 2 left!

Cometic EST Motor Gasket Kit. 3-1/2" Bore – 1992–1999 Evo 1340cc Big Twin This EST (Extreme-Sealing-Technology) gasket set is complete with all gas...

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£273.75 - £273.75
£273.75
£275.86
£275.86 - £275.86
£275.86
£273.75 - £273.75
£273.75
£275.86
£275.86 - £275.86
£275.86

Cometic EST Motor Gasket Kit. 3-1/2" Bore – 1989–1991 Softail; 1991 Dyna

Only 2 left!

Cometic EST Motor Gasket Kit. 3-1/2" Bore – 1989–1991 Softail; 1991 Dyna This EST (Extreme-Sealing-Technology) gasket set is complete with all gask...

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£273.75 - £273.75
£273.75
£275.86
£275.86 - £275.86
£275.86
£273.75 - £273.75
£273.75
£275.86
£275.86 - £275.86
£275.86

Cometic EST Motor Gasket Kit. 3-1/2" Bore – 1984–1986 Evo 1340cc Big Twin 4-Speed…

Only 2 left!

Cometic EST Motor Gasket Kit. 3-1/2" Bore – 1984–1986 Evo 1340cc Big Twin 4-Speed… This EST (Extreme-Sealing-Technology) gasket set is complete wit...

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£273.75 - £273.75
£273.75
£275.86
£275.86 - £275.86
£275.86
£273.75 - £273.75
£273.75
£275.86
£275.86 - £275.86
£275.86

Cometic EST 5-Speed Motor Gasket Kit. 3-1/2" Bore – 1984–1991 FLT/Touring; FXR

Only 3 left!

Cometic EST 5-Speed Motor Gasket Kit. 3-1/2" Bore – 1984–1991 FLT/Touring; FXR This EST (Extreme-Sealing-Technology) gasket set is complete with al...

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£273.75 - £273.75
£273.75
£275.86
£275.86 - £275.86
£275.86
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£46.14
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£46.14
£42.84
£42.84 - £42.84
£42.84

MCS Blue Lightning Air Filter Element – 1986–1989 Big Twin with Round Air…

Only 3 left!

MCS Blue Lightning Air Filter Element – 1986–1989 Big Twin with Round Air… Economically priced but high-end quality and offering superior flow; lon...

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£46.14
£46.14 - £46.14
£46.14
£42.84
£42.84 - £42.84
£42.84
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£27.16 - £27.16
£27.16
£30.43
£30.43 - £30.43
£30.43

MCS 53-84 Tappet Adjusting Screw Kit – 1953–1965 Panhead; 1966–1984 Shovelhead.…

Only 1 left!

MCS 53-84 Tappet Adjusting Screw Kit – 1953–1965 Panhead; 1966–1984 Shovelhead.… With ball end that fits inside the pushrod and 9/32"-32 threaded. ...

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£27.16 - £27.16
£27.16
£30.43
£30.43 - £30.43
£30.43
£64.46 - £64.46
£64.46
£64.95
£64.95 - £64.95
£64.95

James Gaskets Primary Gasket Kit. Outer Cover – 1979–1984 FLT/Touring; 1982–1984 FXR

Only 3 left!

James Gaskets Primary Gasket Kit. Outer Cover – 1979–1984 FLT/Touring; 1982–1984 FXR Incl. .062" silicone beaded paper outer primary; derby & i...

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£64.46 - £64.46
£64.46
£64.95
£64.95 - £64.95
£64.95

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