IndyMX said:
Stick with the factory recommendation.
Sure can't argue with that.
Until you become VERY familiar with your two-stroke engine and how it runs, I would refrain from taking friend's advice that does not agree with the factory's.
Although, in all honesty, there isn't much difference between 32:1 and 40:1...like, what, about eight-tenths of an ounce per gallon of gasoline?
You are probably safe, 99% of the time, running 40:1 (but for what, to save a few pennies on pre-mix oil?)...however, you'll be safe 100% of the time running 32:1.
Run 32:1 for the first year or so on your bike. After that, if there is a very good reason to experiment with other ratios, you can do so with more confidence.