Reply To: Jetting a GT125R – 2017 ..?
The changes to the stock muffler: De-cat, + removed inner (smallest diameter tube) from outlet.
With / without cat. Needed a lot of elbow-grease to get there…
Old and grumpy,(?), have fairly wide engine & tuning experience, "restoring/resto-mod" on cars & mc, worked as electronic tech. (retired).
GT125R - sold. New (used): 2012-GT250R-efi (sold)+ 2017-GV-125C (sold) - got my old 2018-GT-125R back... 🙂