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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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£42.16
£42.16 - £42.16
£42.16
£41.64
£41.64 - £41.64
£41.64

Colony Crankcase Bolt Kit – 1996–1999 Evo Big Twin

Only 2 left!

Colony Crankcase Bolt Kit – 1996–1999 Evo Big Twin Zinc; flanged nut Fitment 96-99 Evo Big Twin (NU) Product Details Brand: Colony Category: MOT...

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£42.16
£42.16 - £42.16
£42.16
£41.64
£41.64 - £41.64
£41.64
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£68.05
£68.05 - £68.05
£68.05
£62.29
£62.29 - £62.29
£62.29

Colony Crankcase Bolt Kit – 1948–1964 PANHEAD

Only 2 left!

Colony Crankcase Bolt Kit – 1948–1964 PANHEAD Acorn; chrome Fitment 48-64 PANHEAD (NU) Product Details Brand: Colony Category: MOTOR PARTS > ...

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£68.05
£68.05 - £68.05
£68.05
£62.29
£62.29 - £62.29
£62.29
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£68.05
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£68.05
£62.29
£62.29 - £62.29
£62.29

Colony Crankcase Bolt Kit – 1940–1947 KNUCKLE

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Colony Crankcase Bolt Kit – 1940–1947 KNUCKLE Chrome acorn Fitment 40-47 KNUCKLE (NU) Product Details Brand: Colony Category: MOTOR PARTS > C...

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£68.05
£68.05 - £68.05
£68.05
£62.29
£62.29 - £62.29
£62.29
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£68.05
£68.05 - £68.05
£68.05
£62.29
£62.29 - £62.29
£62.29

Colony Crankcase Bolt Kit – 1936–1939 Knucklehead

Only 2 left!

Colony Crankcase Bolt Kit – 1936–1939 Knucklehead Acorn; chrome Fitment 36-39 Knucklehead (NU) Product Details Brand: Colony Category: MOTOR PAR...

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£68.05
£68.05 - £68.05
£68.05
£62.29
£62.29 - £62.29
£62.29
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£19.11 - £19.11
£19.11
£22.01
£22.01 - £22.01
£22.01

Colony Knuckle Rocker Box Bolt Kit. Black – 1936–1947 Knucklehead

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Colony Knuckle Rocker Box Bolt Kit. Black – 1936–1947 Knucklehead Black parkerized. OEM style reproduction. Hex bolts; machined from a solid steel ...

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£19.11 - £19.11
£19.11
£22.01
£22.01 - £22.01
£22.01
£24.60 - £24.60
£24.60
£28.36
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£28.36

Colony Knuckle Rocker Box Bolt Kit. Chrome – 1936–1947 Knucklehead

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Colony Knuckle Rocker Box Bolt Kit. Chrome – 1936–1947 Knucklehead Chrome. OEM style reproduction. Hex bolts; machined from a solid steel bar; like...

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£24.60 - £24.60
£24.60
£28.36
£28.36 - £28.36
£28.36
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£27.51
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£27.51
£27.17
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£27.17

Colony Cam Cover Mount Kit, OEM Style – 1937–1973 45" SV

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Colony Cam Cover Mount Kit, OEM Style – 1937–1973 45" SV Black parkerized Fitment 37-73 45" SV (NU) Product Details Brand: Colony Category: MOTO...

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£27.51
£27.51 - £27.51
£27.51
£27.17
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£27.17
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£23.96 - £23.96
£23.96
£27.60
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£27.60

Colony Cam Cover Mount Kit, OEM Style – 1954–1970 XL Sportster

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Colony Cam Cover Mount Kit, OEM Style – 1954–1970 XL Sportster Chrome Fitment 54-70 XL Sportster (NU) Product Details Brand: Colony Category: MO...

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£23.96 - £23.96
£23.96
£27.60
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£27.60
£23.18 - £23.18
£23.18
£26.71
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£26.71

Colony Cam Cover Mount Kit, OEM Style. Black Parkerized – 1936–1969 Big Twin

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Colony Cam Cover Mount Kit, OEM Style. Black Parkerized – 1936–1969 Big Twin For use with 1/4-20 threaded aftermarket cases Fitment 36-69 Big Twin ...

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£23.18 - £23.18
£23.18
£26.71
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£26.71
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£23.18
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Colony Cam Cover Mount Kit, OEM Style – 1936–1969 Big Twin

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Colony Cam Cover Mount Kit, OEM Style – 1936–1969 Big Twin Parkerized; stock style slotted head Fitment 36-69 Big Twin (NU) Product Details Brand...

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£23.18 - £23.18
£23.18
£26.71
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£26.71
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£29.00
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£29.00
£28.65
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£28.65

Colony Cam Cover Mount Kit, OEM Style – 1936–1969 Big Twin

Only 3 left!

Colony Cam Cover Mount Kit, OEM Style – 1936–1969 Big Twin Chrome; stock style slotted head Fitment 36-69 Big Twin (NU) Product Details Brand: Co...

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£29.00
£29.00 - £29.00
£29.00
£28.65
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£28.65
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£15.64 - £15.64
£15.64
£18.01
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£18.01

Colony Tappet Block Mount Kit. OEM Style, Black – L1976–1984 Shovelhead; 1984–1999 Evo Big…

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Colony Tappet Block Mount Kit. OEM Style, Black – L1976–1984 Shovelhead; 1984–1999 Evo Big… 1/4"-20 threaded. OEM reproduction tappet guide hardwar...

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£15.64 - £15.64
£15.64
£18.01
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£18.01
£7.11 - £7.11
£7.11
£7.69
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£7.69

Colony Tappet Block Mount Kit. OEM Style, Chrome – 1957–1985 XL Sportster

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Colony Tappet Block Mount Kit. OEM Style, Chrome – 1957–1985 XL Sportster 5/16-18 threaded. OEM reproduction tappet guide hardware of the hex head ...

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£7.11 - £7.11
£7.11
£7.69
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£7.69
£26.37 - £26.37
£26.37
£30.39
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£30.39

Colony Tappet Block Mount Kit. Cap Style, Chrome – 36-E76 Big Twin. With L1976–1984 Style…

Only 2 left!

Colony Tappet Block Mount Kit. Cap Style, Chrome – 36-E76 Big Twin. With L1976–1984 Style… Conversion kit. 1/4-24 threaded bolts. Used to fit L76-8...

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£26.37 - £26.37
£26.37
£30.39
£30.39 - £30.39
£30.39
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£23.24 - £23.24
£23.24
£26.77
£26.77 - £26.77
£26.77

Colony Tappet Block Mount Kit. Cap Style, Chrome – 36-E76 Big Twin

Out of stock

Colony Tappet Block Mount Kit. Cap Style, Chrome – 36-E76 Big Twin 1/4-20 threaded bolts. Fitment 36-E76 Big Twin (Excl. Flathead Big Twin) (NU) Pr...

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£23.24 - £23.24
£23.24
£26.77
£26.77 - £26.77
£26.77
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£58.55
£58.55 - £58.55
£58.55
£53.59
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£53.59

Colony Sportster Rocker Box Bolt Kit. Acorn, Chrome – 1957–1976 XL Sportster

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Colony Sportster Rocker Box Bolt Kit. Acorn, Chrome – 1957–1976 XL Sportster Wtih custom style acorn bolts. Complete rocker box mounting kit with a...

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£58.55
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£58.55
£53.59
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£53.59
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£29.84
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£29.84
£29.47
£29.47 - £29.47
£29.47

Colony Sportster Rocker Box Bolt Kit. Hex, Chrome – 1957–1976 Sportster

Only 2 left!

Colony Sportster Rocker Box Bolt Kit. Hex, Chrome – 1957–1976 Sportster The OEM style replacement with hex head bolts. Complete rocker box mounting...

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£29.84
£29.84 - £29.84
£29.84
£29.47
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£29.47
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£17.51 - £17.51
£17.51
£20.17
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£20.17

Colony Shovel Rocker Box Top Nut Kit. Chrome, OEM Style – 1966–1984 SHOVEL

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Colony Shovel Rocker Box Top Nut Kit. Chrome, OEM Style – 1966–1984 SHOVEL Chrome. OEM style reproduction. Includes 18 hex nut and washers. Without...

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£17.51 - £17.51
£17.51
£20.17
£20.17 - £20.17
£20.17
£6.90 - £6.90
£6.90
£7.47
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£7.47

Colony Rocker Shaft End Nut Kit. Black – 1936–1947 Knucklehead

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Colony Rocker Shaft End Nut Kit. Black – 1936–1947 Knucklehead Black parkerized finish. Left side nut and lockwasher kit. Repl. 7831. Fitment 36-47...

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£6.90 - £6.90
£6.90
£7.47
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£7.47
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£51.51
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£51.51
£46.81
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£46.81

Colony Knuckle Rocker Nuts – 1936–1947 Knucklehead

Only 2 left!

Colony Knuckle Rocker Nuts – 1936–1947 Knucklehead Chrome. Right side reproduction nuts. The addition of a positive O-ring seal has been made to pr...

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£51.51
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£51.51
£46.81
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£46.81
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£21.47
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£21.47
£21.02
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£21.02

Colony Manifold Inlet Nipple – 1940–1954 74" OHV Big Twin; 1940–1941…

Only 2 left!

Colony Manifold Inlet Nipple – 1940–1954 74" OHV Big Twin; 1940–1941… Exact duplicate threaded steel inlet nipple which screws into the cylinder he...

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£21.47
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£21.47
£21.02
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£21.02
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£119.71
£119.71 - £119.71
£119.71
£118.04
£118.04 - £118.04
£118.04

Colony 74" OHV Plumber to O-ring Conversion Kit – 1940–1947 74" Knucklehead; 1948–1954 74"…

Only 2 left!

Colony 74" OHV Plumber to O-ring Conversion Kit – 1940–1947 74" Knucklehead; 1948–1954 74"… Used to upgrade 40-54 plumber style intake of 1200cc Kn...

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£119.71
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£119.71
£118.04
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£118.04
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£31.58
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£31.58
£30.91
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£30.91

Colony Plumber Style – 1934–1948 74"/80" SV; 1936–1939 61" OHV…

Only 2 left!

Colony Plumber Style – 1934–1948 74"/80" SV; 1936–1939 61" OHV… Parkerized Fitment 34-48 74"/80" SV; 36-39 61" OHV; 40-46 45" WLD (NU) Product Deta...

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£31.58
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£31.58
£30.91
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£30.91
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£18.02 - £18.02
£18.02
£20.76
£20.76 - £20.76
£20.76

Colony Oil Pump Mount Nuts, Cap Style – 1936–1967 Big Twin

Out of stock

Colony Oil Pump Mount Nuts, Cap Style – 1936–1967 Big Twin Chrome; nut & washer set; 1/4-24 H-D thread Fitment 36-67 Big Twin (NU) Product Deta...

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£18.02 - £18.02
£18.02
£20.76
£20.76 - £20.76
£20.76
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