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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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£53.40 - £53.40
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£53.81
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£53.81

James Gaskets Cylinder Head Gasket. .045" Paper/PTFE – L1973–1985 XL1000

Only 2 left!

James Gaskets Cylinder Head Gasket. .045" Paper/PTFE – L1973–1985 XL1000 .045" thick PTFE coated paper. Final crush .042". OEM replacement referenc...

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£53.40 - £53.40
£53.40
£53.81
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£53.81
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£11.42
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£11.42
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£11.27

James Gaskets Compliance Fitting Gasket. FR/RR – 1984–1989 Evo Big Twin with OEM…

Only 3 left!

James Gaskets Compliance Fitting Gasket. FR/RR – 1984–1989 Evo Big Twin with OEM… .031" fiber reinforced paper. OEM style replacement manifold inta...

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£11.42
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£11.42
£11.27
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£25.68
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James Gaskets Gasket Inspection Cover. .031" Paper – 1980–1984 FLT/Touring; 1982–1984 FXR

Only 1 left!

James Gaskets Gasket Inspection Cover. .031" Paper – 1980–1984 FLT/Touring; 1982–1984 FXR .031" thick fiber reinforced paper. OEM replacement refer...

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£25.68
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£25.68
£25.32
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£25.32
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£24.57
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£24.23

James Gaskets Gasket Inner Primary to Transmission. .031" Paper – 1979–1984 FLT/Touring; 1982–1984 FXR

Only 2 left!

James Gaskets Gasket Inner Primary to Transmission. .031" Paper – 1979–1984 FLT/Touring; 1982–1984 FXR .031" fiber reinforced paper. With an adhesi...

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£24.57
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£24.57
£24.23
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£10.70
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James Gaskets Carb to Air Cleaner Housing Gasket. Keihin – 1977–1989 Big Twin; L1976–1987 XL…

Only 3 left!

James Gaskets Carb to Air Cleaner Housing Gasket. Keihin – 1977–1989 Big Twin; L1976–1987 XL… .031" Fiber reinforced paper. OEM replacement referen...

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£10.70
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£10.55
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James Gaskets Felt Pad for Rocker Cover – 1948–1965 Panhead

Only 3 left!

James Gaskets Felt Pad for Rocker Cover – 1948–1965 Panhead Felt material. Replacement for OEM 17507-48 and 174-48. Fitment 48-65 Panhead (NU) Prod...

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£44.99
£45.34
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£45.34
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£16.32
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£16.10
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James Gaskets Oil Pump Gasket & Seal Kit. Shovel/Evo B.T – 1981–1991 Big Twin

Only 4 left!

James Gaskets Oil Pump Gasket & Seal Kit. Shovel/Evo B.T – 1981–1991 Big Twin With Mylar gaskets. Complete overhaul kit for the oil pump. Fitme...

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£16.32
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£16.10
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£16.10
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£33.84
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James Gaskets Shovel Head & Base Gasket Set. 3-5/8" Big Bore – 1966–1984 Shovelhead with 3-5/8" Big…

Only 2 left!

James Gaskets Shovel Head & Base Gasket Set. 3-5/8" Big Bore – 1966–1984 Shovelhead with 3-5/8" Big… .045" blue PTFE coated head & .030" pa...

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£33.37
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£181.05
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£178.52
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Jims Sprocket Shaft Crankcase Bushing. +.032" – 1940–1954 Big Twin

Only 1 left!

Jims Sprocket Shaft Crankcase Bushing. +.032" – 1940–1954 Big Twin Left side crankcase bearing race. Standard size is 2.0015" OD. Oversize replacem...

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£181.05
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£178.52
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£178.52
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£157.78
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£157.78
£155.58
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Jims Sprocket Shaft Crankcase Bushing. STD – 1940–1954 Big Twin

Only 3 left!

Jims Sprocket Shaft Crankcase Bushing. STD – 1940–1954 Big Twin Left side crankcase bearing race. Standard size is 2.0015" OD. Fitment 40-54 Big Tw...

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£157.78
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£157.78
£155.58
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£155.58
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£211.82 - £211.82
£211.82
£213.43
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£213.43

Jims Sprocket Shaft Kit. L81-85 & 70-99 B.T – L1981–1985 OEM Big Twin; 1970–1999 Big…

Only 3 left!

Jims Sprocket Shaft Kit. L81-85 & 70-99 B.T – L1981–1985 OEM Big Twin; 1970–1999 Big… Kit includes: *Flywheel side nut (MCS 978257 / 24017-80)....

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£211.82
£213.43
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£171.81
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£171.81
£169.41
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£169.41

Jims Sprocket Shaft Only. L81-85 & 70-99 B.T – L1981–1985 OEM Big Twin; 1970–1999 Big…

Only 3 left!

Jims Sprocket Shaft Only. L81-85 & 70-99 B.T – L1981–1985 OEM Big Twin; 1970–1999 Big… With aftermarket 6° taper/keyway. Fits L81-85 OEM (which...

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£171.81
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£171.81
£169.41
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£169.41
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£45.64
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£45.64
£44.98
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Jims Sprocket Shaft Spacer – 1970–1999 Big Twin

Only 3 left!

Jims Sprocket Shaft Spacer – 1970–1999 Big Twin OEM style replacement. Machined to a 32 micron finish for extended sprocket shaft seal life. Note: ...

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£45.64
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£45.64
£44.98
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£44.98
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£274.80
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£274.80
£228.83
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£228.83

MCS XL Sportster Cam Cover. Chrome – 2004–2022 XL Sportster

Only 2 left!

MCS XL Sportster Cam Cover. Chrome – 2004–2022 XL Sportster Camshaft bushings are pre-installed. OEM replacement reference 25213-04 Fitment 04-22 X...

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£274.80
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£274.80
£228.83
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£228.83
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£9.85
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£9.37
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MCS Thrust Washer Camshaft. .060" – 1936–1999 Big Twin

Only 2 left!

MCS Thrust Washer Camshaft. .060" – 1936–1999 Big Twin Shims used to achieve correct cam end-play. Approx. dimensions: 1.062" OD; .820" ID. Fitment...

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£9.85
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£9.85
£9.37
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£9.37
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£9.85
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£9.37
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MCS Thrust Washer Camshaft. .065" – 1936–1999 Big Twin

Only 3 left!

MCS Thrust Washer Camshaft. .065" – 1936–1999 Big Twin Shims used to achieve correct cam end-play. Approx. dimensions: 1.062" OD; .820" ID. Fitment...

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£9.85
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£9.85
£9.37
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£9.37
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£9.85
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£9.85
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MCS Thrust Washer Camshaft. .075" – 1936–1999 Big Twin

Only 3 left!

MCS Thrust Washer Camshaft. .075" – 1936–1999 Big Twin Shims used to achieve correct cam end-play. Approx. dimensions: 1.062" OD; .820" ID. Fitment...

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£9.85
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£9.85
£9.37
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£9.85
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£9.37
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MCS Thrust Washer Camshaft. .080" – 1936–1999 Big Twin

Only 2 left!

MCS Thrust Washer Camshaft. .080" – 1936–1999 Big Twin Shims used to achieve correct cam end-play. Approx. dimensions: 1.062" OD; .820" ID. Fitment...

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£9.85
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£9.85
£9.37
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£27.38
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£27.38
£27.05
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£27.05

Colony Oil Pump and Crankcase Plug Set – 1968–1980 Big Twin

Only 3 left!

Colony Oil Pump and Crankcase Plug Set – 1968–1980 Big Twin Hex 3 plug set Fitment 68-80 Big Twin (NU) Product Details Brand: Colony Category: M...

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£27.38
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£27.38
£27.05
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£27.05
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£24.97 - £24.97
£24.97
£28.76
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£28.76

Colony Oil Pump and Crankcase Plug Set – 1981–1999 Big Twin

Only 4 left!

Colony Oil Pump and Crankcase Plug Set – 1981–1999 Big Twin Chrome; 3 plug set Fitment 81-99 Big Twin (Excl. TC) Product Details Brand: Colony C...

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£24.97 - £24.97
£24.97
£28.76
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£28.76
Sold out
£62.54
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£62.54
£57.55
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Gardner-Westcott Head Bolt Kit, Hex. Chrome Stock Style – 1948–1984 Big Twin

Out of stock

Gardner-Westcott Head Bolt Kit, Hex. Chrome Stock Style – 1948–1984 Big Twin Incl. washers Fitment 48-84 Big Twin (NU) Product Details Brand: Gar...

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£62.54
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£57.55
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£31.43
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£31.43

Colony Tappet Block Mount Kit. OEM Style, Chrome – L53-E76 Big Twin

Only 2 left!

Colony Tappet Block Mount Kit. OEM Style, Chrome – L53-E76 Big Twin 1/4"-24 threaded. OEM reproduction tappet guide hardware of the hex head bolts ...

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£27.27 - £27.27
£27.27
£31.43
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£31.43
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£35.15
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£35.15
£34.72
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Colony High-torque – 1936–1984 Big Twin

Only 3 left!

Colony High-torque – 1936–1984 Big Twin Chrome; no washers; provides extra space for big bore cylinders but fits stock bore equally well Fitment 36...

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£35.15
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£34.72
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£48.00
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£43.62
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Colony +.200" Stroker Upper Pushrod Cover Kit. Chrome – 1966–1984 Shovelhead; 1984–1999 Evo Big…

Only 2 left!

Colony +.200" Stroker Upper Pushrod Cover Kit. Chrome – 1966–1984 Shovelhead; 1984–1999 Evo Big… 3-1/2" long; for +.200" longer stroker cylinders. ...

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£43.62
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£43.62
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