5wt oil. Use Honda oil.
Honda recommends a 20:1 ratio for the older 2 stroke engines. The best premix oil you should use is Honda HP2 for this ratio. Use a ratio-rite ( available at most motorcycle shops ) to ensure a proper mixture.
Use a 15-40 W engine oil that is JASO MA or MA2 approved, or equally any SF or SG graded oil that is of similar thickness. For a very worn engine you can use a 40 W single grade oil of the afrementioed specifications.
The best transmission oil to use in any Honda vehicle is the Honda brand. This transmission oil is create to supplement Honda's design and is proven to make the components last.
bellray 80w case saver
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
The kind of oil that you should use for the Honda CR 250 is Honda HP2 mixed at 32:1. You do not want to use regular motor oil in your bike.
what type of oil should i use in a 1991 Honda cr 80
Use the weight specified in your owner's manual.
SAE 5w30 is what Honda recommends. So that is what you should use.
Always use the Honda brand oil. 10-40.
10w40