3.937"  Bore Cylinder for S&S 98" and 107" Big Bore Kits for 1999-'16 Big Twins - Silver Finish

3.937" Bore Cylinder for S&S 98" and 107" Big Bore Kits for 1999-'16 Big Twins - Silver Finish

Item #: 910-0478
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$324.95
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This is a replacement cylinder for engines with either 98" (1999-'06) or 107" (2007-'16) S&S bolt-in big bore kits. Cylinder fits front or rear positions. Order two cylinders for a set. Cylinders are honed to size for replacement pistons. No piston fitting is necessary unless additional clearance for immediate racing applications is desired.

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S&S 3.937" pistons are machined to such close tolerances that it is not necessary to measure the piston. Additionally, the low friction coating on the piston skirt of early production pistons with out micrometer window makes taking measurements very difficult. Therefore, hone cylinders to nominal diameter +/- 0.0001" for correct clearance. Current production pistons have micrometer windows in the coating on the piston skirts that allow accurate measurements to be taken. These pistons may be installed by honing cylinder to nominal diameter +/- 0.0001" or by measuring piston and honing cylinder to achieve .002" - .0025" close clearance for street applications or .0032" - .0045" loose clearance for immediate competition use.