Features & Benefits:
* Includes 3cc Dome Forged Pistons.
* Includes 0.045in. Head Gaskets.
* 3.937in. Bore.
* 4-3/8in. Stroke.
* 10.5:1 Compression Ratio with Stock 85cc Heads.
* 10.1:1 Compression Ratio with S&S 89cc Heads # SS106-3255
Tech Tips:
* Use Care during assembly to avoid damage to Cylinder Spigots.
* Ring gaps must be checked & Recorded by the assembling Technician.
* Piston to Cylinder Clearance must be checked by the ass embling Technician & Cylinders honed with torque plates fitted if required.
* Rev Limit should be set at 2500 rpm for the first 80klm.
* Rev Limit should then be set at 3500 rpm for a further 1,500klm.5t
* To prevent Detonation, Over fuelling etc a Proven EFI Map is required to adjust the Factory Fuel & Timing Calibrations & bring your Engine into Equilibrium with your new Mods.
* Will Not Fit with S&S 79cc Heads.
Proudly Made in the USA by S&S Cycle !
