Hello, All. Has anyone seen this type of lifter bore wear pattern? What could have caused it? My only experience is with iron block engines.
The bike is new to me. It is a 2000 FLHRI EFI RK with 22k miles. Original sales invoice says Stage 1 was added. It does have the K&N air cleaner and the SE slip-ons.
Went in to check tensioner shoes and also found frosting on all four cam lobes and this distinctive wear pattern (vertical striations) in the lifter bores. (I haven't attempted to measure anything yet.) All four appear to be smooth. I can't feel any grooves with finger or by lightly dragging a pic over the surfaces. The lifter rollers all seem to have normal wear.
The pic is included as an attachment. (I don't have a public file server at the moment)
Trying google drive link below here. May/may not work. Apologies.