What is the fuel mixture

Are you asking as in oil to fuel, or air to fuel? If oil to fuel I seem to recall that these were oil injected unless the oil injection is failed and you are mixing now or it is a old RM? Please get back with that info and you will get a better answer.

If oil to fuel is the question then 32 to 1 would be good for a newer 2 stroke and if from the 1980's 20 to one. I would be more comfortable if I knew the year before making and certain mix ratio though. You can contact a Suzuki dealer to get the info also... That is if it is not a oil injected model.

Back at one point I recall some 2 stroke with oil injection sprayed the oil so as to increase longevity. Bypassing the injection may not be the best idea although some people, Not Suzuki Techs, state with confidence that bypassing is just fine. While I am a Suzuki trained Tech it has been some years since I worked on them as I went on to Porsche.

I added a link that will answer you if it is about air fuel ratios.
Airfuel ratio Wikipedia the free encyclopedia