Hello, I got my Sno Runner running after rebuilding the carb, but it does not take more than half throttle. I am using a 24:1 fuel mixture (per the manual). Is that the correct mixture or should I be using something like 40:1? I have played with the H idle screw, from 1/2 out to 4 out, seems the best is about 1.5 out, but it boggs down at half throttle.