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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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S&S Cycle Flywheel Assembly 4140 Steel
£2,100.25 - £2,100.25
£2,100.25
£2,100.25 - £2,100.25
£2,100.25

S&S Cycle Flywheel Assembly 4140 Steel #320-0604

Only 3 left!

DescriptionFlywheel AssemblyPerfect for gear drive camshaftsConsistent balance and precision machiningBalance gear is installed for easy installati...

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£2,100.25 - £2,100.25
£2,100.25
£2,100.25 - £2,100.25
£2,100.25
S&S Cycle Flywheel Assembly 4140 Steel
£2,100.25 - £2,100.25
£2,100.25
£2,100.25 - £2,100.25
£2,100.25

S&S Cycle Flywheel Assembly 4140 Steel #320-0603

Only 1 left!

DescriptionFlywheel AssemblyPerfect for gear drive camshaftsConsistent balance and precision machiningBalance gear is installed for easy installati...

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£2,100.25 - £2,100.25
£2,100.25
£2,100.25 - £2,100.25
£2,100.25
S&S Cycle Replacement Flywheel Assembly 4140 Steel
£1,888.75 - £1,888.75
£1,888.75
£1,888.75 - £1,888.75
£1,888.75

S&S Cycle Replacement Flywheel Assembly 4140 Steel #320-0354

in stock

DescriptionReplacement Flywheel AssemblyFor 96"/103"/106" big bore | 110"/117" engine with stock or S&S pistons (will be noted)Fully assembled ...

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£1,888.75 - £1,888.75
£1,888.75
£1,888.75 - £1,888.75
£1,888.75
S&S Cycle Replacement Flywheel Assembly 4140 Steel
£1,645.65 - £1,645.65
£1,645.65
£1,645.65 - £1,645.65
£1,645.65

S&S Cycle Replacement Flywheel Assembly 4140 Steel #320-0396

in stock

DescriptionReplacement Flywheel AssemblyS&S 3-piece flywheels with integral main shafts are the strongest yet, made from 4140 steel and feature...

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£1,645.65 - £1,645.65
£1,645.65
£1,645.65 - £1,645.65
£1,645.65
S&S Cycle Replacement Flywheel Assembly 4140 Steel
£1,598.93 - £1,598.93
£1,598.93
£1,598.93 - £1,598.93
£1,598.93

S&S Cycle Replacement Flywheel Assembly 4140 Steel #320-0402

Only 4 left!

DescriptionReplacement Flywheel AssemblyS&S 3-piece flywheels with integral main shafts are the strongest yet, made from 4140 steel and feature...

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£1,598.93 - £1,598.93
£1,598.93
£1,598.93 - £1,598.93
£1,598.93
S&S Cycle 106" Stroker Flywheel Kit Flywheel Assembly
£1,888.75 - £1,888.75
£1,888.75
£1,888.75 - £1,888.75
£1,888.75

S&S Cycle 106" Stroker Flywheel Kit Flywheel Assembly #320-0454

Only 2 left!

Description106" Stroker Flywheel KitFeature three-piece assembled flywheels with shaftsDo not require any motor case modification4-1/2" stroke103" ...

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£1,888.75 - £1,888.75
£1,888.75
£1,888.75 - £1,888.75
£1,888.75
S&S Cycle Replacement Flywheel Assembly 4140 Steel
£1,784.56 - £1,784.56
£1,784.56
£1,784.56 - £1,784.56
£1,784.56

S&S Cycle Replacement Flywheel Assembly 4140 Steel #320-0353

Only 4 left!

DescriptionReplacement Flywheel AssemblyS&S 3-piece flywheels with integral main shafts are the strongest yet, made from 4140 steel and feature...

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£1,784.56 - £1,784.56
£1,784.56
£1,784.56 - £1,784.56
£1,784.56
S&S Cycle Sprocket Shaft Assembly Motor
£150.23 - £150.23
£150.23
£150.23 - £150.23
£150.23

S&S Cycle Sprocket Shaft Assembly Motor #33-2004

in stock

DescriptionSprocket Shaft AssemblyIncludes tapered shaft, nut and keysFor use with standard diameter bearingMade in the USAFits S&S® SE or SL f...

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£150.23 - £150.23
£150.23
£150.23 - £150.23
£150.23
S&S Cycle Pinion Shaft Assembly Silver Steel
£168.08 - £168.08
£168.08
£168.08 - £168.08
£168.08

S&S Cycle Pinion Shaft Assembly Silver Steel #33-2027

in stock

DescriptionPinion Shaft AssemblyIncludes shaft, nut and keysMade in the USAFor use with standard bearing diameter.Fits L'81-'99 Big Twin with OEM f...

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£168.08 - £168.08
£168.08
£168.08 - £168.08
£168.08
S&S Cycle Crankcase Screen Oil Oiling
£7.96 - £7.96
£7.96
£7.96 - £7.96
£7.96

S&S Cycle Crankcase Screen Oil Oiling #31-2010

in stock

DescriptionCrankcase Screen OilSold as a Pack (5)Specifications Type: Oiling Product Name: Crankcase Units: Each Part NumbersItem Number: 092002...

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£7.96 - £7.96
£7.96
£7.96 - £7.96
£7.96
S&S Cycle Special Application Crankcase Engine Case Natural Kit
£2,076.70 - £2,076.70
£2,076.70
£2,076.70 - £2,076.70
£2,076.70

S&S Cycle Special Application Crankcase Engine Case Natural Kit #31-0047

Only 3 left!

DescriptionSpecial Application CrankcaseDesigned for high performance engines with cylinder bores 4.000"Cam chest is moved outward 0.250" to allow ...

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£2,076.70 - £2,076.70
£2,076.70
£2,076.70 - £2,076.70
£2,076.70
S&S Cycle Magnetic Oil Drain Plug
£18.22 - £18.22
£18.22
£18.22 - £18.22
£18.22

S&S Cycle Magnetic Oil Drain Plug - 50-8335

in stock

DescriptionMagnetic Oil Drain PlugUsed on S&S crankcases manufactured after 05/01/2000Made in the USASpecifications Riding Style: Street Prod...

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£18.22 - £18.22
£18.22
£18.22 - £18.22
£18.22
S&S Cycle Super Stock® Alternator Style Engine Case Black Powder-Coated Standard Bore A356 T-6 Aluminium Alloy Kit
£2,094.80 - £2,094.80
£2,094.80
£2,094.80 - £2,094.80
£2,094.80

S&S Cycle Super Stock® Alternator Style Engine Case Black Powder-Coated Standard Bore A356 T-6 Aluminium Alloy Kit #31-0052

Only 1 left!

DescriptionSuper Stock® Alternator Style Engine Case3.5" stock bore cylinder case for any stroke up to and including 5" and most stock length conne...

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£2,094.80 - £2,094.80
£2,094.80
£2,094.80 - £2,094.80
£2,094.80
S&S Cycle Super Stock® Generator Engine Case Natural A356 T-6 Aluminium Alloy Kit
£2,284.79 - £2,284.79
£2,284.79
£2,284.79 - £2,284.79
£2,284.79

S&S Cycle Super Stock® Generator Engine Case Natural A356 T-6 Aluminium Alloy Kit #31-0008

Only 1 left!

DescriptionSuper Stock® Generator Engine CaseInclude crankcase bolts, washers and nuts, cylinder mounting studs, timing hole plug, magnetic drain p...

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£2,284.79 - £2,284.79
£2,284.79
£2,284.79 - £2,284.79
£2,284.79
£284.02 - £284.02
£284.02
£284.02 - £284.02
£284.02

Trask Mystfree Kit Breather Valve Crankcase 6061 T6 Aluminium #DM-1999

in stock

DescriptionMystfree KitMachined T-6061 billet aluminium constructionHelps oil drain more efficiently into the rockerReduces oil misting coming from...

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£284.02 - £284.02
£284.02
£284.02 - £284.02
£284.02
S&S Cycle Super Stock® Alternator Style Engine Case Black Powder-Coated Standard Bore A356 T-6 Aluminium Alloy Kit
£1,668.48 - £1,668.48
£1,668.48
£1,668.48 - £1,668.48
£1,668.48

S&S Cycle Super Stock® Alternator Style Engine Case Black Powder-Coated Standard Bore A356 T-6 Aluminium Alloy Kit #31-0055

in stock

DescriptionSuper Stock® Alternator Style Engine Case3.5" stock bore cylinder case for any stroke up to and including 5" and most stock length conne...

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£1,668.48 - £1,668.48
£1,668.48
£1,668.48 - £1,668.48
£1,668.48
S&S Cycle Crankcase Breather Reed Valve Breather Valve Silver
£155.65 - £155.65
£155.65
£155.65 - £155.65
£155.65

S&S Cycle Crankcase Breather Reed Valve Breather Valve Silver #31-2100

in stock

DescriptionCrankcase Breather Reed ValveNew-style breather is not dependent on the rotation of the crankshaft to make it open and close. Instead, r...

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£155.65 - £155.65
£155.65
£155.65 - £155.65
£155.65
S&S Cycle Crankcase Breather Reed Valve Breather Valve Silver
£150.22 - £150.22
£150.22
£150.22 - £150.22
£150.22

S&S Cycle Crankcase Breather Reed Valve Breather Valve Silver #31-2096

in stock

DescriptionCrankcase Breather Reed ValveNew-style breather is not dependent on the rotation of the crankshaft to make it open and close. Instead, r...

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£150.22 - £150.22
£150.22
£150.22 - £150.22
£150.22
S&S Cycle Piston Kit 106" Stroker
Sold out
£569.09 - £569.09
£569.09
£569.09 - £569.09
£569.09

S&S Cycle Piston Kit 106" Stroker #92-1210

Out of stock

DescriptionPiston Kit 106" StrokerRequired for S&S 106" stock bore stroker kit with 4-1/2" stroke flywheelsCompatible with stock or S&S Sup...

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£569.09 - £569.09
£569.09
£569.09 - £569.09
£569.09
Sold out
S&S Cycle Wrist Pin Circlips 4 Pack
£6.30 - £6.30
£6.30
£6.30 - £6.30
£6.30

S&S Cycle Wrist Pin Circlips 4 Pack #94-9254

in stock

DescriptionWrist Pin CirclipsFor use with S&S Cycle wrist pinsSold in pack of 4Specifications Product Name: Circlip Riding Style: Street App...

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£6.30 - £6.30
£6.30
£6.30 - £6.30
£6.30
S&S Cycle Ring Set Piston 2 Pack
£148.41 - £148.41
£148.41
£148.41 - £148.41
£148.41

S&S Cycle Ring Set Piston 2 Pack #940-0060

in stock

DescriptionRing SetComplete set of piston ringsMade in the U.S.A.Specifications Product Name: Ring Set Riding Style: Street Type: Piston Units:...

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£148.41 - £148.41
£148.41
£148.41 - £148.41
£148.41
S&S Cycle Piston Kit Big Bore 4.250" for M8 Models Forged Big Bore
£565.87 - £565.87
£565.87
£565.87 - £565.87
£565.87

S&S Cycle Piston Kit Big Bore 4.250" for M8 Models Forged Big Bore #920-0135

Only 4 left!

DescriptionPiston Kit Big Bore 4.250" for M8 ModelsThe Piston Kit Big Bore for M8 models is built for durability and consistent performanceThese fo...

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£565.87 - £565.87
£565.87
£565.87 - £565.87
£565.87
S&S Cycle Wrist Pin Circlips 4 Pack
£8.27 - £8.27
£8.27
£8.27 - £8.27
£8.27

S&S Cycle Wrist Pin Circlips 4 Pack #106-2304

in stock

DescriptionWrist Pin CirclipsFor use with .927" wristpinsMade in the U.S.A.Specifications Units: 4 Pack Product Name: Circlip Riding Style: Stre...

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£8.27 - £8.27
£8.27
£8.27 - £8.27
£8.27
S&S Cycle Big Bore Forged Piston Kit
£535.79 - £535.79
£535.79
£535.79 - £535.79
£535.79

S&S Cycle Big Bore Forged Piston Kit #920-0100

in stock

DescriptionBig Bore Forged Piston KitPistons are compatible with stock rods with tapered wristpin endsStock cylinders may be bored to accommodate l...

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£535.79 - £535.79
£535.79
£535.79 - £535.79
£535.79

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