HarleyTechTalk

 Do Fuel Moto , Harley & S&S all use the thin, low tension ring packs on their kits and crates?. Thanks.

Don't know about Fuel Moto, but S&S 124", and Harley 120R does use the narrow oil rings. Custom pistons = You need to ask the manufacturer, as I've had some brands come in with both 2.0 mm, 2.5 mm, and 3 mm.
John