Red Line is a great choice. I’ve been using it for years and have never stuck an engine. 16:1 is the right ratio for your set up. I would dump the remaining fuel just to inspect the bottom of the tank plus you want to get your needle settings with a know mix.
FAA certified jet engine and aircraft technician,
Nicholson Speedway class champion 2001,
Yamaha KT100 Service Center,
41 years karting experience