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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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£191.44
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£191.44
£190.14
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£190.14

Feuling Oil Tank Breather Kit. Polished. Dyna – 1999–2005 Dyna

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Feuling Oil Tank Breather Kit. Polished. Dyna – 1999–2005 Dyna Polished stainless cap. Dyna models have the oil tank mounted under the transmission...

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£191.44
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£191.44
£190.14
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£190.14
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£42.67
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£42.67
£40.63
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£40.63

Cometic Case Saver Gasket. Foamet – 1970–1984 Shovel; 1984–1999 Evo Big…

Only 2 left!

Cometic Case Saver Gasket. Foamet – 1970–1984 Shovel; 1984–1999 Evo Big… .060" thick aluminum base with foam rubber layer on both sides. Case saver...

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£42.67
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£42.67
£40.63
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£40.63
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£221.09
£222.79
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£222.79

Cometic EST Motor Gasket Kit. 3.937" Bore – 2006–2017 107" Dyna

Only 2 left!

Cometic EST Motor Gasket Kit. 3.937" Bore – 2006–2017 107" Dyna This EST (Extreme-Sealing-Technology) gasket set is complete with all gaskets; seal...

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£221.09
£222.79
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£222.79
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£221.09
£222.79
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£222.79

Cometic EST Motor Gasket Kit. 3.937" Bore – 2006–2017 107" Dyna

Only 2 left!

Cometic EST Motor Gasket Kit. 3.937" Bore – 2006–2017 107" Dyna This EST (Extreme-Sealing-Technology) gasket set is complete with all gaskets; seal...

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£221.09 - £221.09
£221.09
£222.79
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£222.79
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£136.28
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£136.28
£134.38
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£134.38

Cometic EST Motor Only Gasket Kit. 4.125" Bore – 1999–2017 Twin Cam. Incl. 1999–2004…

Only 2 left!

Cometic EST Motor Only Gasket Kit. 4.125" Bore – 1999–2017 Twin Cam. Incl. 1999–2004… With .036" MLS (Multi Layer Steel) 4-1/8" bore head gaskets. ...

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£136.28
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£134.38
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£134.38
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£136.28
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£136.28
£134.38
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£134.38

Cometic EST Motor Only Gasket Kit. 4.125" Bore – 1999–2017 Twin Cam. Incl. 1999–2004…

Only 2 left!

Cometic EST Motor Only Gasket Kit. 4.125" Bore – 1999–2017 Twin Cam. Incl. 1999–2004… With .040" MLS (Multi Layer Steel) 4-1/8" bore head gaskets. ...

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£136.28
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£136.28
£134.38
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£134.38
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£51.20
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£51.20
£48.75
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£48.75

Cometic Cylinder Head Gasket Set. 3-7/8" .040" MLS – 1984–1999 Evo Big Twin

Only 2 left!

Cometic Cylinder Head Gasket Set. 3-7/8" .040" MLS – 1984–1999 Evo Big Twin .040" 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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£168.11
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£168.11
£165.77
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£165.77

Cometic EST Motor Gasket Kit. 4.060" Bore – 1999–2006 Twin Cam A/B

Only 2 left!

Cometic EST Motor Gasket Kit. 4.060" Bore – 1999–2006 Twin Cam A/B This EST (Extreme-Sealing-Technology) gasket set is complete with all gaskets; s...

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£168.11
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£168.11
£165.77
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£165.77
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£8.94
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£8.94
£8.23
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£8.23

Cometic Cylinder Base Gasket Set FR/RR. .020" Fiber – 1963–1965 Panhead; 1966–1984 Shovelhead

Out of stock

Cometic Cylinder Base Gasket Set FR/RR. .020" Fiber – 1963–1965 Panhead; 1966–1984 Shovelhead Front & rear set. .020" fiber; a premium hi-tempe...

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£8.94
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£8.94
£8.23
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£8.23
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£17.53
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£17.53
£16.69
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£16.69

Cometic Gasket Breather Baffle – 2011–2017 Twin Cam

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Cometic Gasket Breather Baffle – 2011–2017 Twin Cam Gasket only; no filter element. Fitment 11-17 Twin Cam (NU) Product Details Brand: Cometic C...

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£17.53
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£17.53
£16.69
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£16.69
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£168.08
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£168.08
£165.75
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£165.75

Cometic EST Motor Gasket Kit. 4.060" Bore – 2006–2017 107" Dyna

Only 2 left!

Cometic EST Motor Gasket Kit. 4.060" Bore – 2006–2017 107" Dyna This EST (Extreme-Sealing-Technology) gasket set is complete with all gaskets; seal...

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£168.08
£168.08 - £168.08
£168.08
£165.75
£165.75 - £165.75
£165.75
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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. 3.937" Bore – 1999–2006 Twin Cam A/B

Only 2 left!

Cometic EST Motor Gasket Kit. 3.937" Bore – 1999–2006 Twin Cam A/B This EST (Extreme-Sealing-Technology) gasket set is complete with all gaskets; s...

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£168.11
£168.11 - £168.11
£168.11
£165.77
£165.77 - £165.77
£165.77
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£18.71
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£18.71
£17.81
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£17.81

Cometic Seal and Ferrule Oil Filter – 1992–1999 Big Twin

Only 1 left!

Cometic Seal and Ferrule Oil Filter – 1992–1999 Big Twin Fits steel oil lines with stock case mounted oil filter. OEM replacement reference 63528-9...

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£18.71
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£18.71
£17.81
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£17.81
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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. Fiber 3-5/8" Big Bore – 1984–1999 Evo Big Twin with S&S…

Only 2 left!

Cometic Cylinder Base Gasket Set. Fiber 3-5/8" Big Bore – 1984–1999 Evo Big Twin with S&S… Front & rear gasket for one engine. .020" fiber;...

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£27.71
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£27.71
£26.38
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£26.38
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£114.80
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£114.80
£113.20
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£113.20

Cometic Rocker Cover Gaskets. CFM-20 – 1966–1984 Shovelhead

Only 2 left!

Cometic Rocker Cover Gaskets. CFM-20 – 1966–1984 Shovelhead .043" thick CFM-20. A gasket with a perforated stainless steel core with a heat resista...

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£114.80
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£114.80
£113.20
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£113.20
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£24.58
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£24.58
£23.40
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£23.40

Cometic Rocker Cover Gasket Set. 2-Pack. CFM-20 – 1966–1984 Shovelhead

Only 2 left!

Cometic Rocker Cover Gasket Set. 2-Pack. CFM-20 – 1966–1984 Shovelhead .043" thick CFM-20. A gasket with a perforated stainless stee core with a he...

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£24.58
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£24.58
£23.40
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£23.40
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£30.19
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£30.19
£28.74
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£28.74

Cometic Air Cleaner Housing to Filter Element Gasket. Fiber – 2008–2013 FLT/Touring

Only 2 left!

Cometic Air Cleaner Housing to Filter Element Gasket. Fiber – 2008–2013 FLT/Touring Fiber. 2.200" bore. Used between the air filter backplate assem...

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£30.19
£30.19 - £30.19
£30.19
£28.74
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£28.74
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£221.09 - £221.09
£221.09
£222.79
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£222.79

Cometic EST Motor Gasket Kit. 4" Bore – 1999–2006 FLT/Touring

Only 2 left!

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

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£221.09 - £221.09
£221.09
£222.79
£222.79 - £222.79
£222.79
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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. 3-13/16" .030" MLS – 2008–2012 XR1200 with 3-13/16" (3.812")…

Only 2 left!

Cometic Cylinder Head Gasket Set. 3-13/16" .030" MLS – 2008–2012 XR1200 with 3-13/16" (3.812")… .030" thick MLS (Multi Layer Steel). Consists of a ...

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£51.20
£51.20 - £51.20
£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. 3-13/16" .040" MLS – 2008–2012 XR1200 with 3-13/16" (3.812")…

Only 2 left!

Cometic Cylinder Head Gasket Set. 3-13/16" .040" MLS – 2008–2012 XR1200 with 3-13/16" (3.812")… .040" thick MLS (Multi Layer Steel). Consists of a ...

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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. 3.5" Bore .040" MLS – 2008–2012 XR1200

Only 2 left!

Cometic Cylinder Head Gasket Set. 3.5" Bore .040" MLS – 2008–2012 XR1200 .040" thick MLS (Multi Layer Steel). MLS consists of a top and bottom laye...

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£51.20
£51.20 - £51.20
£51.20
£48.75
£48.75 - £48.75
£48.75
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£54.82
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£54.82
£52.20
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£52.20

Cometic Valve Guide Seals. Viton – L1981–1984 1340cc Shovelhead

Out of stock

Cometic Valve Guide Seals. Viton – L1981–1984 1340cc Shovelhead Viton rubber. Fits stock .625" O.D. valve guides. Valve stem seals can be used; and...

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£54.82
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£54.82
£52.20
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£52.20
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£27.71
£27.71 - £27.71
£27.71
£26.38
£26.38 - £26.38
£26.38

Cometic Cylinder Base Gasket Set. RCS 3-5/8" Big Bore – 1948–1965 Panhead with S&S 3-5/8" Big…

Only 2 left!

Cometic Cylinder Base Gasket Set. RCS 3-5/8" Big Bore – 1948–1965 Panhead with S&S 3-5/8" Big… Front & rear gasket for one engine. .020" th...

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£27.71
£27.71 - £27.71
£27.71
£26.38
£26.38 - £26.38
£26.38
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£27.58
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£27.58
£26.26
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£26.26

Cometic Gasket Transmission Top Cover. AFM – 1986–1999 Big Twin

Only 1 left!

Cometic Gasket Transmission Top Cover. AFM – 1986–1999 Big Twin AFM (Aluminum Foamette Material). OEM replacement reference 34904-86; 34904-86A; 34...

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£27.58
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£27.58
£26.26
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£26.26
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