Re: Need advice on Oil mixture
That's pretty high. I would go with 24:1 for a tank or two, and 40:1 after.
Do a quick search on "break in". But to make a long story short, ride at moderate speeds, vary the throttle and engine speed, and don't run the engine too slow for break in.
Try not to run down hill with the throttle closed for any amount of time, that will starve the engine for oil.
Check your plug for proper color. (brown or slightly oily black) NOT WHITE or GRAY!