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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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£76.75
£76.75 - £76.75
£76.75
£72.08
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£72.08

MCS Panhead Rocker Cover D-ring Kit. Chrome – 1948–1965 Panhead

Out of stock

MCS Panhead Rocker Cover D-ring Kit. Chrome – 1948–1965 Panhead Chrome plated die-cast aluminum reinforcement D-rings. Complete with chrome plated ...

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£76.75
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£76.75
£72.08
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£97.83
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£88.26
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£88.26

Jims Oil Pump Driven Gear. 24T – 1973–1999 Big Twin

Only 3 left!

Jims Oil Pump Driven Gear. 24T – 1973–1999 Big Twin OEM style replacement. Fits S&S; S&S HVHP & OEM style oil pumps. Fitment 73-99 Big ...

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£97.83
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£97.83
£88.26
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£88.26
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£34.89
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£32.11
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£32.11

MCS Evo Spark Plug & Head Bolt Cover Kit. Chrome – 1986–1999 Big Twin

Only 3 left!

MCS Evo Spark Plug & Head Bolt Cover Kit. Chrome – 1986–1999 Big Twin Chrome plated steel construction. Gives the finishing touch to your cylin...

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£34.89
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£34.89
£32.11
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£32.11
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£139.19
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£139.19
£137.24
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£137.24

Jims Crankpin L81-99 XL. Std – L1981–1999 XL Sportster

Only 3 left!

Jims Crankpin L81-99 XL. Std – L1981–1999 XL Sportster Standard O.D. 1.250". 3-hole oiling design. Use JIMS 978254 crankpin nuts. Use 517951 (Repl....

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£139.19
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£139.19
£137.24
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£137.24
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£87.60
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£87.60
£80.62
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MCS Fat Bob Flatside Fuel Tank Conversion Mount Kit – 1958–1984 FL; FX with 1984–1999 Flatside…

Only 3 left!

MCS Fat Bob Flatside Fuel Tank Conversion Mount Kit – 1958–1984 FL; FX with 1984–1999 Flatside… Gas tank conversion kit to mount the later; 84-99 s...

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£87.60
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£87.60
£80.62
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£9.85
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£9.37
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£9.37

MCS Thrust Washer Camshaft. .090" – 1936–1999 Big Twin

Out of stock

MCS Thrust Washer Camshaft. .090" – 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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£9.37
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£9.37
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£9.85
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£9.37
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£9.37

MCS Thrust Washer Camshaft. .085" – 1936–1999 Big Twin

Only 1 left!

MCS Thrust Washer Camshaft. .085" – 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
£9.37
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£9.37
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£27.82
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£27.40
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£27.40

Jims Needle Bearing Camshaft. ''Full Needle'' – 1958–1999 Big Twin

Only 4 left!

Jims Needle Bearing Camshaft. ''Full Needle'' – 1958–1999 Big Twin When still present it is advised to replace the low cost OEM needle bearing in 9...

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£27.82
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£27.40
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£25.93
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Jims Bushing Idler / Circuit Breaker Gear – 1932–1969 OHV Big Twin; 1930–1973 45"…

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Jims Bushing Idler / Circuit Breaker Gear – 1932–1969 OHV Big Twin; 1930–1973 45"… Bushing for idler & circuit breaker gear. OEM style replacem...

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£22.34 - £22.34
£22.34
£25.93
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£25.93
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£48.22
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£48.22
£44.14
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£44.14

Jims Shaft Idler Gear – 1936–1969 Big Twin

Only 3 left!

Jims Shaft Idler Gear – 1936–1969 Big Twin Stock style replacement part for OEM 25791-36. Fitment 36-69 Big Twin (NU) Product Details Brand: Jims...

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£48.22
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£48.22
£44.14
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£44.14
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£44.68 - £44.68
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James Gaskets Carb to Manifold Seal. 44mm SE – H-D with 44mm Screamin'' Eagle CV…

Only 2 left!

James Gaskets Carb to Manifold Seal. 44mm SE – H-D with 44mm Screamin'' Eagle CV… U-seal for the larger 44mm Screamin'' Eagle CV carb with 44mm int...

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£44.68 - £44.68
£44.68
£45.02
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£45.02
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£18.51
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£18.25
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£18.25

James Gaskets O-ring Transmission Mainshaft. Right End – L1984 FXR; FXRS; 1984–1986 5-Speed Big…

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James Gaskets O-ring Transmission Mainshaft. Right End – L1984 FXR; FXRS; 1984–1986 5-Speed Big… 1 used. OEM replacement reference 11162. Fitment L...

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£18.51
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£18.25
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£21.57
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£21.27
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£21.27

James Gaskets Filter Element, Breather Baffle – 1999–2010 Twin Cam

Only 3 left!

James Gaskets Filter Element, Breather Baffle – 1999–2010 Twin Cam 2 used. Replaces OEM 63815-99. Fitment 99-10 Twin Cam (NU) Product Details Bra...

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£21.57
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£21.57
£21.27
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£21.27
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£36.78
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£36.78
£36.27
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£36.27

James Gaskets James O-ring, Rear Shock Air Control – 1998–2001 SOME FLT/Touring

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James Gaskets James O-ring, Rear Shock Air Control – 1998–2001 SOME FLT/Touring James o-ring, rear shock air control Fitment 98-01 SOME FLT/Touring...

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£36.78
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£36.78
£36.27
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£36.27
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£35.64
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£35.15
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£35.15

James Gaskets Umbrella Valve – 1999–2010 Twin Cam

Only 2 left!

James Gaskets Umbrella Valve – 1999–2010 Twin Cam Rubber. For head breathing system. Replaces OEM 26858-99. Fitment 99-10 Twin Cam (NU) Product Det...

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£35.64
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£35.64
£35.15
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£35.15
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£18.33
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£18.33
£18.07
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£18.07

James Gaskets Gaskets Breather Cover. RCM – 1999–2010 Twin Cam

Only 3 left!

James Gaskets Gaskets Breather Cover. RCM – 1999–2010 Twin Cam .020" RCM (Rubber Coated Metal). OEM replacement reference 17591-99 Fitment 99-10 Tw...

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£18.33
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£18.33
£18.07
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£18.07
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£29.50
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£29.50
£29.09
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James Gaskets Gasket Rocker Cover. Upper. RCM – 1999–2017 Twin Cam

Only 3 left!

James Gaskets Gasket Rocker Cover. Upper. RCM – 1999–2017 Twin Cam .020" RCM (Rubber Coated Metal) with silicone bead. OEM replacement reference 17...

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£29.50
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£29.50
£29.09
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£29.50
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£29.09
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James Gaskets Gasket Lower Rocker Cover. RCM – 1999–2017 Twin Cam

Only 2 left!

James Gaskets Gasket Lower Rocker Cover. RCM – 1999–2017 Twin Cam .020" RCM (Rubber Coated metal) with silicone bead. 1-piece left/right gasket.; 2...

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£29.50
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£29.50
£29.09
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£29.09
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£7.58
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£7.22
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£7.22

James Gaskets O-ring Cam Support Plate Plug – 1999–2006 Twin Cam

Only 2 left!

James Gaskets O-ring Cam Support Plate Plug – 1999–2006 Twin Cam Viton. OEM replacement reference 11298. Fitment 99-06 Twin Cam (Excl. 2006 Dyna) (...

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£7.58
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£7.58
£7.22
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£7.22
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£5.83
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£5.55
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£5.55

James Gaskets O-ring Cylinder Head & Base Stud. Viton – 1999–2003 Twin Cam (Cyl. Head)…

Only 3 left!

James Gaskets O-ring Cylinder Head & Base Stud. Viton – 1999–2003 Twin Cam (Cyl. Head)… Heat resistant rubber. Cylinder head 4 used. Cylinder b...

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£5.83
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£5.55
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£5.55
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£9.11
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£9.11
£8.67
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£8.67

James Gaskets O-ring Breather Baffle – 1999–2010 Twin Cam

Only 3 left!

James Gaskets O-ring Breather Baffle – 1999–2010 Twin Cam 2 used. OEM replacement reference 11270. Fitment 99-10 Twin Cam (NU) Product Details Br...

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£9.11
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£9.11
£8.67
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£207.41
£212.10
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James Gaskets Motor Gasket & Seal Kit. XL883/1200 – 2004–2006 XL883/1200

Only 4 left!

James Gaskets Motor Gasket & Seal Kit. XL883/1200 – 2004–2006 XL883/1200 0.045" head gaskets for both 883cc and 1200cc engines; RCM (Rubber Coa...

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£207.41 - £207.41
£207.41
£212.10
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£185.09 - £185.09
£185.09
£189.27
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£189.27

James Gaskets Motor Gasket & Seal Kit. XL 883/1200 – 1991–2003 XL883/1200

Only 3 left!

James Gaskets Motor Gasket & Seal Kit. XL 883/1200 – 1991–2003 XL883/1200 0.045" head gaskets for both 883cc and 1200cc engines; RCM (Rubber Co...

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£185.09 - £185.09
£185.09
£189.27
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James Gaskets Motor Gasket & Seal Kit. XL Sportster – 1986–1990 4-Speed XL883/1100/1200 Models

Only 3 left!

James Gaskets Motor Gasket & Seal Kit. XL Sportster – 1986–1990 4-Speed XL883/1100/1200 Models 0.045" thick 883 and 1100/1200 head gaskets with...

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£157.69 - £157.69
£157.69
£161.26
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£161.26

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