Big bore oil/fuel ratio with injector question

I upgraded to a 70cc big bore kit and plan to use oil injection, and pre mix. What’s a good ratio to run?

 

What type of oil are you using? Mineral 2 stroke oils could be anywhere from 20:1 to 32:1, while fully synth oils often recommend 50:1 or higher. Generally the better the oil the less smoky it's gonna be. A good compromise for your big bore conversion might be 40:1 semi synth.

 

Use one or the other, not both.