Piston set 3-7/16" bore standard size with compression ratio of 7.5:1. Set includes Hasting 3 piece rings, 2 wrist pins and 4 circlips. Pistons have a steel expansion control strut cast
**NOTE: Run engine at moderate speeds for at least 500 miles, avoiding excessive running in lower gears, in order to properly break-in new pistons and rings.
FL Electra Glide® 1941-1977
FX Super Glide® 1971-1977