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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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£45.44
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£43.27
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£43.27

Hastings 2-3/4" Bore Piston Ring Set. +.020" – 1950–1973 45" (750cc) Flathead; All…

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Hastings 2-3/4" Bore Piston Ring Set. +.020" – 1950–1973 45" (750cc) Flathead; All… Used with late style 1950-1973 type pistons with 1/16" gray iro...

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£45.44
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£43.27
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£43.27
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£288.12 - £288.12
£288.12
£290.34
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£290.34

MCS Replacement 45" Flathead Piston Kit. +.050" – 1929–1973 45" (750cc) Side Valves

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MCS Replacement 45" Flathead Piston Kit. +.050" – 1929–1973 45" (750cc) Side Valves Cast aluminum OEM style pistons for a stock rebuild. Wil fit al...

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£288.12 - £288.12
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£290.34
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£290.34
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£334.69
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£334.69
£323.11
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£323.11

KB Performance Piston 96"/103" To 110" Twin Cam Piston Kit. STD – 2007–2017 110" Twin Cam

Only 2 left!

KB Performance Piston 96"/103" To 110" Twin Cam Piston Kit. STD – 2007–2017 110" Twin Cam Forged big bore conversion piston set. Used for convertin...

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£334.69
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£334.69
£323.11
£323.11 - £323.11
£323.11
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£334.69
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£334.69
£323.11
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£323.11

KB Performance Piston 96" To 103" Twin Cam Piston Kit. STD – 2007–2017 96" Twin Cam

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KB Performance Piston 96" To 103" Twin Cam Piston Kit. STD – 2007–2017 96" Twin Cam Forged piston set. For 96" (3-3/4") to 103" (3-7/8") big bore c...

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£323.11
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£323.11
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£334.69
£334.69 - £334.69
£334.69
£323.11
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£323.11

KB Performance Piston 88" To 95" Twin Cam Piston Kit. STD – 1999–2006 88" Twin Cam

Out of stock

KB Performance Piston 88" To 95" Twin Cam Piston Kit. STD – 1999–2006 88" Twin Cam 88" (3-3/4") to 95" (3-7/8") big bore conversion forged piston s...

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£334.69
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£334.69
£323.11
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£323.11
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£275.62
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£275.62
£266.08
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£266.08

KB Performance Piston 3-5/8 Big Bore Forged Piston Kit. STD – 1948–1984 Pan; Shovel. With 3-5/8 Big…

Out of stock

KB Performance Piston 3-5/8 Big Bore Forged Piston Kit. STD – 1948–1984 Pan; Shovel. With 3-5/8 Big… Forged 3-5/8 big bore piston set. Used with 3-...

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£275.62
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£275.62
£266.08
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£266.08
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£275.62
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£275.62
£266.08
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£266.08

KB Performance Piston 1340 Shovel Forged Piston Kit. STD – 1979–1984 1340cc Shovel

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KB Performance Piston 1340 Shovel Forged Piston Kit. STD – 1979–1984 1340cc Shovel Forged piston set. 9.0:1 CR with 112cc head. Piston weight 416gr...

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£275.62
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£275.62
£266.08
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£266.08
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£275.62
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£275.62
£266.08
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£266.08

KB Performance Piston 1200cc B.T. Forged Piston Kit. STD – 1941–1978 1200cc/80" Knuckle; Pan…

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KB Performance Piston 1200cc B.T. Forged Piston Kit. STD – 1941–1978 1200cc/80" Knuckle; Pan… Forged piston set. 8.5:1 CR with 112cc head. Standard...

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£275.62
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£275.62
£266.08
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£266.08
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£311.07
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£311.07
£300.31
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£300.31

KB Performance Piston Piston Set Std – 1986–2022 XL883 (883 to 1200 Conversion)

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KB Performance Piston Piston Set Std – 1986–2022 XL883 (883 to 1200 Conversion) 883-1200 conversion forged piston set. 10.1 CR with 51cc head. Work...

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£311.07
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£311.07
£300.31
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£300.31
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£311.07
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£311.07
£300.31
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£300.31

KB Performance Piston 1340 Evo B.T. Forged Piston Kit. STD – 1984–1999 Evo Big Twin

Out of stock

KB Performance Piston 1340 Evo B.T. Forged Piston Kit. STD – 1984–1999 Evo Big Twin Forged piston set. 9.5:1 CR with 80cc head. Piston weight 365gr...

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£311.07
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£311.07
£300.31
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£300.31
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£235.55
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£235.55
£227.40
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£227.40

KB Performance Piston XR1200/Buell XB Piston Kit. STD – 2008–2012 XR1200; 2008–2010 Buell 1200…

Out of stock

KB Performance Piston XR1200/Buell XB Piston Kit. STD – 2008–2012 XR1200; 2008–2010 Buell 1200… Forged aluminum piston set for stock stroke and cyl...

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£235.55
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£235.55
£227.40
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£227.40
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£233.68
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£233.68
£225.59
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£225.59

KB Performance Piston 96" To 103" Big Bore Piston Set. Std – 2007–2017 Twin Cam

Only 2 left!

KB Performance Piston 96" To 103" Big Bore Piston Set. Std – 2007–2017 Twin Cam For 96" to 103" (3 3/4" to 3 7/8") big bore conversions. Used with ...

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£233.68
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£233.68
£225.59
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£225.59
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£255.33
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£255.33
£246.49
£246.49 - £246.49
£246.49

KB Performance Piston 883-1200 Big Bore Piston Kit. STD – 1986–2022 XL883 (883 to 1200 Conversion)

Only 2 left!

KB Performance Piston 883-1200 Big Bore Piston Kit. STD – 1986–2022 XL883 (883 to 1200 Conversion) STD compression. 883-1200 conversion piston set....

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£255.33
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£255.33
£246.49
£246.49 - £246.49
£246.49
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£319.16
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£319.16
£308.12
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£308.12

KB Performance Piston 88" To 95" Big Bore Piston Set. Std – 1999–2006 Twin Cam

Only 2 left!

KB Performance Piston 88" To 95" Big Bore Piston Set. Std – 1999–2006 Twin Cam 88" to 95" big bore conversion. Used with stock heads and cylinders....

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£319.16
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£319.16
£308.12
£308.12 - £308.12
£308.12
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£227.06
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£227.06
£219.20
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£219.20

KB Performance Piston XL883 Piston Kit. STD – 1986–2022 XL883

Out of stock

KB Performance Piston XL883 Piston Kit. STD – 1986–2022 XL883 Standard replacement piston set. Stock 9.0:1 compression ratio. Piston weight 253gr. ...

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£227.06
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£227.06
£219.20
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£219.20
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£5.97
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£5.97
£5.69
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£5.69

KB Performance Piston Keith Black, Replacement .792" Piston Lock Ring – All .792" KB Pistons

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KB Performance Piston Keith Black, Replacement .792" Piston Lock Ring – All .792" KB Pistons Fits all KB .792" piston pins. 2 used on 1 piston. Not...

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£5.97
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£5.97
£5.69
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£5.69
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£306.43
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£306.43
£295.83
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£295.83

KB Performance Piston 88" To 95" Big Bore Piston Set. +.010" – 1999–2006 Twin Cam A/B

Only 2 left!

KB Performance Piston 88" To 95" Big Bore Piston Set. +.010" – 1999–2006 Twin Cam A/B 88" to 95" big bore conversion kit. Used with stock heads and...

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£306.43
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£306.43
£295.83
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£295.83
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£306.46
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£306.46
£295.86
£295.86 - £295.86
£295.86

KB Performance Piston 3-5/8" Big Bore Piston Kit. +.010" – 1948–1984 Big Twin with 3-5/8 Big Bore…

Out of stock

KB Performance Piston 3-5/8" Big Bore Piston Kit. +.010" – 1948–1984 Big Twin with 3-5/8 Big Bore… 3-5/8" big bore piston set. Used with 3 5/8" big...

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£306.46
£306.46 - £306.46
£306.46
£295.86
£295.86 - £295.86
£295.86
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£255.33
£255.33 - £255.33
£255.33
£246.49
£246.49 - £246.49
£246.49

KB Performance Piston 1340cc Evo B.T. Pop-up Piston Kit. +.005" – 1984–1999 Evo Big Twin

Only 2 left!

KB Performance Piston 1340cc Evo B.T. Pop-up Piston Kit. +.005" – 1984–1999 Evo Big Twin Pop-up high compression. 10.5:1 CR. Piston weight 360gr. P...

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£255.33
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£255.33
£246.49
£246.49 - £246.49
£246.49
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£255.33
£255.33 - £255.33
£255.33
£246.49
£246.49 - £246.49
£246.49

KB Performance Piston 1340cc Evo B.T. Pop-up Piston Kit. STD – 1984–1999 Evo Big Twin

Only 2 left!

KB Performance Piston 1340cc Evo B.T. Pop-up Piston Kit. STD – 1984–1999 Evo Big Twin Pop-up high compression. 9.5:1 CR. Piston weight 392gr. Pisto...

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£255.33
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£255.33
£246.49
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£246.49
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£242.17
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£242.17
£233.79
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£233.79

KB Performance Piston 1340cc Evo B.T. Piston Kit. +.005" – 1984–1999 Evo Big Twin

Only 2 left!

KB Performance Piston 1340cc Evo B.T. Piston Kit. +.005" – 1984–1999 Evo Big Twin 8.5:1 CR. Piston weight 350gr. Piston pin weight 97gr. Head type:...

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£242.17
£242.17 - £242.17
£242.17
£233.79
£233.79 - £233.79
£233.79
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£242.17
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£242.17
£233.79
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£233.79

KB Performance Piston 1340cc Evo B.T. Piston Kit. STD – 1984–1999 Evo Big Twin

Only 2 left!

KB Performance Piston 1340cc Evo B.T. Piston Kit. STD – 1984–1999 Evo Big Twin 8.5:1 CR. Piston weight 350gr. Piston pin weight 97gr. Head type: Fl...

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£242.17
£242.17 - £242.17
£242.17
£233.79
£233.79 - £233.79
£233.79
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£255.33
£255.33 - £255.33
£255.33
£246.49
£246.49 - £246.49
£246.49

KB Performance Piston 1340cc Shovel Pop-up Piston Kit. +.005" – 1979–1984 1340cc Shovel

Only 2 left!

KB Performance Piston 1340cc Shovel Pop-up Piston Kit. +.005" – 1979–1984 1340cc Shovel High compression pop-up piston set. 9.5:1 CR. Piston weight...

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£255.33
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£255.33
£246.49
£246.49 - £246.49
£246.49
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£255.33
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£255.33
£246.49
£246.49 - £246.49
£246.49

KB Performance Piston 1340cc Shovel Piston Kit. STD – 1979–1984 1340cc Shovel

Only 2 left!

KB Performance Piston 1340cc Shovel Piston Kit. STD – 1979–1984 1340cc Shovel 8.0:1 CR. Piston weight 357gr. Piston pin weight 97gr. Head type: Dom...

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£255.33
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£255.33
£246.49
£246.49 - £246.49
£246.49
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