Top End

Spring kits contain springs and titanium upper collars; lower collars included as required; spring kits are engineered for use with standard and oversized valvesSpring kits come complete for one motorKeepers are not includedMade in the U.S.A. KTM -- 450...

Complete kits include cylinder sleeves, pistons and head gasket750cc kit increase bore and stroke to 83.5mm x 67.8mm (stock is 78 mm x 67.8 mm)865cc Increases bore and stroke to 90 mm x 67.8 mm (stock is 78 mm x 67.8 mm)Both kits increase compression...

Complete kits include cylinder sleeves, pistons and head gasket750cc kit increase bore and stroke to 83.5mm x 67.8mm (stock is 78 mm x 67.8 mm)865cc Increases bore and stroke to 90 mm x 67.8 mm (stock is 78 mm x 67.8 mm)Both kits increase compression...

All piston kits come with two pistons, rings, wrist pins, and wrist pin keepersCompression ratios listed are approximate and are calculated using the correct length cylinders as specified by S&SRequires the use of connecting rods with a rod length of 7...

Significantly increase performanceProvides more horsepower without sacrificing torque10.6:1 compression ratioSimple EFI tuning with three calibration downloads for Dynojet® Power Vision® tuner

Increase the displacement of 883cc and 1200cc engines to 1250cc at 10.3:1 compressionCast Flat-Topped Replacement Piston Kits For 1984-'99 HD® Big Twins with Stock Heads or S&S Performance Replacement HeadsMay be used with stock 1200cc cylinder heads,...

Progressively wound springs using Kobe super-clean, chrome silicon-based wire that is heat treated and shot peenedTight-tolerance, FEA-designed hardened steel Posi-Loc? style upper retainers to ensure correct assembly height and resist keeper "pull...

S&S Cycle 132" Big-Bore Cylinder Kit - Black Granite/Highlighted Fins - M8 910-0847

Huge bore increase (4.320") means huge power increaseRetains stock engine heightPowder coat finish match factory finish, giving the bike a “sleeper” advantageWorks with stock crankcasesMLS (multi-layered steel) head gasketsOriginal engine serial numbers...

Huge displacement increase means huge power increaseWorks with stock crankcasesOriginal engine serial numbers are retainedPowder coat finish matches factory finish045" MLS (multi-layered steel) head gasketsRetains stock engine heightIncludes 131" Cam...

Bolt on Cylinder Set For M8 Models

Bolt on big bore kits mean easy installation with no machining and no rebalancingS&S bolt-in cams and premium tappets make the most of the added displacementCams are .482" lift and 240° duration intake and 234° degree duration exhaustCompression ratio 9...