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Bore=3.498″ – Stroke=3.812Hypereutectic Alloy is a cast 16% silicon content materialPerfect for air cooled enginesLow thermal expansion rate = tighter piston-to-cylinder clearanceTech Tips:-9.0:1 Compression Ratio with 69cc Head Chamber Volume.Follow Ring End Gap & Piston to Cylinder Clearances...

Features & Benefits:-Bore = 3.503″Stroke = 4.250″Hypereutectic Alloy is a cast 16% silicon content material.Perfect for air cooled engines.Low thermal expansion rate = tighter piston-to-cylinder clearance.Complete kit includes: two pistons, rings, wrist pins and clips.Tech Tips:-9.6:1 Compressio...

Features & Benefits:-Bore = 3.498″Stroke = 4.250″Hypereutectic Alloy is a cast 16% silicon content material.Perfect for air cooled engines.Low thermal expansion rate = tighter piston-to-cylinder clearance.Complete kit includes: two pistons, rings, wrist pins and clips.Tech Tips:-10.5:1 Compressi...

Cylinder Studs: Features & Benefits:-4140 Chrome Moly studs, oil quenched and tempered to 39-44 HRC180,000psi Tensile StrengthRounded thread roots, rather than flat, improving fatigue strengthPositive stop shoulder allows for consistent installed heightHead Bolts: Features & Benefits:-Heat Treated 8...

Features & Benefits:-Bore = 3.238″Stroke = 3.812″Fits Iron Head Sporty.Hypereutectic Alloy is a cast 16% silicon content material.Perfect for air cooled engines.Low thermal expansion rate = tighter piston-to-cylinder clearance.Complete kit includes: two pistons, rings, wrist pins and clips.Repla...

Features & Benefits:-ID # 6932Bore = 3.937″Stroke = 4.375″Fully CNC machinedBalanced to /- 1 gramDouble forced pin oilersForged from high strength 2618 alloyDesigned for maximum performance, horsepower and reliabilityComplete kit includes two pistons, ring sets, wrist pins and clipsTech Tips:-Su...

Features & Benefits:-ID # 2621Bore = 3.937″Stroke = 2.835″Fully CNC machinedBalanced to /- 1 gramDouble forced pin oilersForged from high strength 2618 alloyDesigned for maximum performance, horsepower and reliabilityComplete kit includes two pistons, ring sets, wrist pins and clipsTech Tips:-OE...

Features & Benefits:-Use with performance exhaust, air cleaner, S&S 585 bolt-in cams & EFI tune to produce massive horsepower gains.Tech Tips:-Will Not Fit Twin Cooled Models.Pistons measure 3.9975″ when new.0025″ Clearance with stock 4.00″ bore.Pistons may be slightly more noisy than stock.Re...

Features & Benefits:-Bore = 3.885″Stroke = 4.000″Hypereutectic Alloy is a cast 16% silicon content materialPerfect for air cooled engines.Low thermal expansion rate = tighter piston-to-cylinder clearance.Complete kit includes: two pistons, rings, wrist pins and clips.Tech Tips:-10.5:1 Compressio...

Features & Benefits:-Bore=3.875″Stroke=4.000″Hypereutectic Alloy is a cast 16% silicon content materialPerfect for air cooled enginesLow thermal expansion rate = tighter piston-to-cylinder clearanceComplete kit includes: two pistons, rings, wrist pins and clips.Tech Tips:-10.5:1 Compression Rati...

Features & Benefits:-4.250″ BoreBlack with CNC Machined FinsIncludes Dowel Pins (Does NOT include Pistons)Replaces OEM # 16800075 or 16800095Suggested Additional Purchase:1.a) Top End Gasket Kit # CG-C10223 or CG-C10181-HBPiston Options:114/117ci ->128ciCP Carrillo # CAR-M5110 = 11.0:1CP Carrillo...

Features & Benefits:-The ring pack has been moved down 0.080″ to prevent the breakage issues the Stock HD cast pistons are having.Bore = 4.085″Stroke = 4.625″Fully CNC machinedBalanced to /- 1 gramDouble forced pin oilersForged from high strength 2618 alloyDesigned for maximum performance, hor...

Features & Benefits:-Bore = 3.437″Stroke = 3.969″Hypereutectic Alloy is a cast 16% silicon content material.Perfect for air cooled engines.Low thermal expansion rate = tighter piston-to-cylinder clearance.Complete kit includes: two pistons, rings, wrist pins and clips.Replaces OEM # 22141-55BRep...

Features & Benefits:-Bore = 3.875″Stroke = 4.000″Hypereutectic Alloy is a cast 16% silicon content material.Perfect for air cooled engines.Low thermal expansion rate = tighter piston-to-cylinder clearanceComplete kit includes: two pistons, rings, wrist pins and clips.Tech Tips:-9.3:1 Compression...

Features & Benefits:-Bore = 3.498″Stroke = 4.250″Forged 4032 Alloy is an 11% silicon alloy that is formed in a forging press then fully machinedBest resistance to cracking in hi-comp performance applicationsRequire.001″ wider piston to wall clearanceComplete kit includes: two pistons, rings, w...

Features & Benefits:-ID # 6918Bore = 4.060″Stroke = 4.625″Fully CNC machinedBalanced to /- 1 gramDouble forced pin oilersForged from high strength 2618 alloyDesigned for maximum performance, horsepower and reliabilityComplete kit includes two pistons, ring sets, wrist pins and clipsSuggested Add...

Features & Benefits:-ID # 6918Bore = 4.070″Stroke = 4.625″Fully CNC machinedBalanced to /- 1 gramDouble forced pin oilersForged from high strength 2618 alloyDesigned for maximum performance, horsepower and reliabilityComplete kit includes two pistons, ring sets, wrist pins and clipsSuggested Add...