What is the proper ratio gas to oil mix for an 1984 Honda 250r three wheeler?

i have an 84 250R and an 85 250R i use 91 octane gas and super M premix I mix 32:1 although u can use 40:1 or 50:1 anytime u change your mix you'll foul a spark plug so carry a few extras so u dont get stuck out in the hills