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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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£46.80 - £46.80
£46.80
£47.16
£47.16 - £47.16
£47.16

James Gaskets Cylinder Head Gasket Set. .045" Firering – 1948–1965 Panhead

Only 3 left!

James Gaskets Cylinder Head Gasket Set. .045" Firering – 1948–1965 Panhead .045" Fiber reinforced paper head gasket with Firering and silicone bead...

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£46.80 - £46.80
£46.80
£47.16
£47.16 - £47.16
£47.16
£48.24 - £48.24
£48.24
£48.61
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£48.61

James Gaskets Cylinder Head Gaskets .045" – 1948–1965 Panhead

Only 3 left!

James Gaskets Cylinder Head Gaskets .045" – 1948–1965 Panhead .045" PTFE coated fiber reinforced paper. Final crush .042". OEM replacement referenc...

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£48.24 - £48.24
£48.24
£48.61
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£48.61
£48.21 - £48.21
£48.21
£48.58
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£48.58

James Gaskets Cylinder Head Gaskets .045" – 1936–1947 E; EL; F; FL Knucklehead

Only 2 left!

James Gaskets Cylinder Head Gaskets .045" – 1936–1947 E; EL; F; FL Knucklehead PTFE coated paper head gaskets. .045" ; final crush .042". OEM repla...

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£48.21 - £48.21
£48.21
£48.58
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£48.58
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£166.08
£166.08 - £166.08
£166.08
£163.76
£163.76 - £163.76
£163.76

Jims Sprocket Shaft. 72-E81 B.T – 72-E81 Big Twin with OEM Flywheels

Only 1 left!

Jims Sprocket Shaft. 72-E81 B.T – 72-E81 Big Twin with OEM Flywheels Fits with OEM flywheels. Sprocket shaft does not have a keyway. Taper is 8-1/2...

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£166.08
£166.08 - £166.08
£166.08
£163.76
£163.76 - £163.76
£163.76
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£189.46
£189.46 - £189.46
£189.46
£186.82
£186.82 - £186.82
£186.82

Jims L81-99 Crankpin Kit. STD – L1981–1999 Big Twin

Only 1 left!

Jims L81-99 Crankpin Kit. STD – L1981–1999 Big Twin Incl. nuts & key. Standard O.D. 1.2495". 3-hole oil design. This convenient precision kit i...

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£189.46
£189.46 - £189.46
£189.46
£186.82
£186.82 - £186.82
£186.82
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£206.50
£206.50 - £206.50
£206.50
£203.62
£203.62 - £203.62
£203.62

Jims 41-E81 Crankpin Kit. STD – 41-E81 Big Twin

Only 3 left!

Jims 41-E81 Crankpin Kit. STD – 41-E81 Big Twin Incl. nuts & keys. Standard O.D. 1.2490". 3-hole oil design. This convienient precision kit inc...

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£206.50
£206.50 - £206.50
£206.50
£203.62
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£203.62
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£144.80
£144.80 - £144.80
£144.80
£142.78
£142.78 - £142.78
£142.78

Jims L81-99 Crankpin, 180 Degree. STD – L1981–1999 Big Twin

Only 3 left!

Jims L81-99 Crankpin, 180 Degree. STD – L1981–1999 Big Twin Standard O.D. 1.2495". 3-hole oil design on 180° for improved lubrication of the bearin...

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£144.80
£144.80 - £144.80
£144.80
£142.78
£142.78 - £142.78
£142.78
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£144.80
£144.80 - £144.80
£144.80
£142.78
£142.78 - £142.78
£142.78

Jims L81-99 Crankpin. STD – L1981–1999 Big Twin

Only 3 left!

Jims L81-99 Crankpin. STD – L1981–1999 Big Twin 3-hole oil design. Use JIMS 978252 crankpin nuts. Use 517951 (Repl. 11218) woodruff keys. Replaces ...

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£144.80
£144.80 - £144.80
£144.80
£142.78
£142.78 - £142.78
£142.78
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£15.71
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£15.71
£15.49
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£15.49

James Gaskets Star Hub (3-Piece) – 1936–1966 Big Twin; Flatheads

Only 2 left!

James Gaskets Star Hub (3-Piece) – 1936–1966 Big Twin; Flatheads James gasket set, star hub (3-piece) Fitment 36-66 Big Twin; Flatheads (NU) Produc...

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£15.71
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£15.71
£15.49
£15.49 - £15.49
£15.49
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£148.53
£148.53 - £148.53
£148.53
£146.45
£146.45 - £146.45
£146.45

Jims 41-E81 Crankpin. STD But 0.25" Shorter – 41-E81 Big Twin

Only 3 left!

Jims 41-E81 Crankpin. STD But 0.25" Shorter – 41-E81 Big Twin This special crankpin is identical to the JIMS 506870 crankpin but are ground shorter...

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£148.53
£148.53 - £148.53
£148.53
£146.45
£146.45 - £146.45
£146.45
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£148.53
£148.53 - £148.53
£148.53
£146.45
£146.45 - £146.45
£146.45

Jims 41-E84 Crankpin, 180 Degree. STD – 41-E81 Big Twin

Only 3 left!

Jims 41-E84 Crankpin, 180 Degree. STD – 41-E81 Big Twin Standard O.D. 1.2490". 3-hole oil design on 180° for improved lubrication of the bearing di...

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£148.53
£148.53 - £148.53
£148.53
£146.45
£146.45 - £146.45
£146.45
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£141.05
£141.05 - £141.05
£141.05
£139.08
£139.08 - £139.08
£139.08

Jims 41-E84 Crankpin. STD – 41-E81 Big Twin

Only 1 left!

Jims 41-E84 Crankpin. STD – 41-E81 Big Twin Standard O.D. 1.2490". 3-hole oil design. Use JIMS 978251 crankpin nuts. Use JIMS 978618 (Repl. 23985-1...

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£141.05
£141.05 - £141.05
£141.05
£139.08
£139.08 - £139.08
£139.08
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£690.74 - £690.74
£690.74
£696.04
£696.04 - £696.04
£696.04

Paughco Slash Cut Exhaust (38"). Chrome – 1957–1985 XL Sportster

Only 2 left!

Paughco Slash Cut Exhaust (38"). Chrome – 1957–1985 XL Sportster Order 506472 bracket and 506473 clamps separately. 902814 brake stop required on 8...

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£690.74 - £690.74
£690.74
£696.04
£696.04 - £696.04
£696.04
Sold out
£43.46
£43.46 - £43.46
£43.46
£42.84
£42.84 - £42.84
£42.84

Paughco Panhead Custom Header Clamps Stainless Steel – 1948–1965 Panhead

Out of stock

Paughco Panhead Custom Header Clamps Stainless Steel – 1948–1965 Panhead Stainless steel. OEM style replacement. Used to mount exhaust to cylinder ...

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£43.46
£43.46 - £43.46
£43.46
£42.84
£42.84 - £42.84
£42.84
Sold out
Sold out
£408.95 - £408.95
£408.95
£412.08
£412.08 - £412.08
£412.08

Paughco Drag Pipes (40"). Chrome – 1948–1964 Panhead

Out of stock

Paughco Drag Pipes (40"). Chrome – 1948–1964 Panhead Standard 1 3/4" diameter; slash cut end. Without baffles. Also a good solution to use as head ...

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£408.95 - £408.95
£408.95
£412.08
£412.08 - £412.08
£412.08
Sold out
Sold out
£461.22 - £461.22
£461.22
£464.76
£464.76 - £464.76
£464.76

Paughco Drag Pipes (40"). Chrome – 1971–1984 Shovel

Out of stock

Paughco Drag Pipes (40"). Chrome – 1971–1984 Shovel Standard 1 3/4" diameter; slash cut end. Without baffles. Also a good solution to use as head p...

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£461.22 - £461.22
£461.22
£464.76
£464.76 - £464.76
£464.76
Sold out
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£57.99
£57.99 - £57.99
£57.99
£57.17
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£57.17

Paughco XL Sportster Custom Header Clamp. Stainless – 1957–1985 XL Sportster

Only 2 left!

Paughco XL Sportster Custom Header Clamp. Stainless – 1957–1985 XL Sportster Stainless. OEM style replacement. Used to mount exhaust to cylinder he...

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£57.99
£57.99 - £57.99
£57.99
£57.17
£57.17 - £57.17
£57.17
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£121.63
£121.63 - £121.63
£121.63
£119.93
£119.93 - £119.93
£119.93

Jims Crankpin 54-E81 XL. Std – 54-E81 K; XL Sportster

Only 3 left!

Jims Crankpin 54-E81 XL. Std – 54-E81 K; XL Sportster Standard O.D. 1.250". 3-hole oiling design. Use JIMS 978253 crankpin nuts. Use 517950 (Repl. ...

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£121.63
£121.63 - £121.63
£121.63
£119.93
£119.93 - £119.93
£119.93
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£179.80
£179.80 - £179.80
£179.80
£177.29
£177.29 - £177.29
£177.29

Jims 24-73 Flathead Crankpin – 1929–1973 All 45" (750cc) Flathead…

Only 3 left!

Jims 24-73 Flathead Crankpin – 1929–1973 All 45" (750cc) Flathead… Standard O.D. 1.000". 1-hole oiling design for stock flywheels. Use JIMS 978260 ...

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£179.80
£179.80 - £179.80
£179.80
£177.29
£177.29 - £177.29
£177.29
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£461.22 - £461.22
£461.22
£464.76
£464.76 - £464.76
£464.76

Paughco Shotgun Drag Pipes (40"). Chrome – 1991–1999 FLSTF Fat Boy; FLSTN Nostalgia

Only 1 left!

Paughco Shotgun Drag Pipes (40"). Chrome – 1991–1999 FLSTF Fat Boy; FLSTN Nostalgia OEM Shotgun style. Standard 1 3/4" diameter; slash cut end. Wit...

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£461.22 - £461.22
£461.22
£464.76
£464.76 - £464.76
£464.76
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£180.83
£180.83 - £180.83
£180.83
£155.20
£155.20 - £155.20
£155.20

MCS Fat Bob Gas Tank, 5 Gallon – 1936–1984 FL; FX

Only 3 left!

MCS Fat Bob Gas Tank, 5 Gallon – 1936–1984 FL; FX Stock style replacement Fat Bob style gas tank that fits all 4-speed 48-84 Big Twin models (excl....

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£180.83
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£180.83
£155.20
£155.20 - £155.20
£155.20
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£171.55
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£171.55
£147.24
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£147.24

MCS Fat Bob Gas Tank, 3.5 Gallon – 1936–1984 FL; FX

Only 3 left!

MCS Fat Bob Gas Tank, 3.5 Gallon – 1936–1984 FL; FX Used with pre-83 bajonet style gas caps. Stock style replacement Fat Bob style gas tank that fi...

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£171.55
£171.55 - £171.55
£171.55
£147.24
£147.24 - £147.24
£147.24
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£8.51
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£8.51
£8.08
£8.08 - £8.08
£8.08

Kuryakyn Vacuum Adapter Kit

Only 3 left!

Kuryakyn Vacuum Adapter Kit Gives an extra vacuum connection. Standard supplied in Kuryakyn Hyperchargers. On models with a MAP sensor adaptor you ...

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£8.51
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£8.51
£8.08
£8.08 - £8.08
£8.08
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£35.87
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£35.87
£34.45
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£34.45

MCS Aluminum Pan/Shovel Pushrod Conversion Kit – 1948–1952 Panheads with 1966–1983…

Only 2 left!

MCS Aluminum Pan/Shovel Pushrod Conversion Kit – 1948–1952 Panheads with 1966–1983… Fits 48-52 Panheads using 66-83 Shovelhead top end. Fitment 48-...

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£35.87
£35.87 - £35.87
£35.87
£34.45
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£34.45
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