Really nice kart and anyone can easily see you are highly qualified.
I have Never run 100:1 for an hour at WOT in a custom built high performance engine.
I have run 20:1 and it is horrible. No other way to put it.
My experience leads me to the 100:1 camp.
Your experience, and challenge :-) is worthy of a qualified response.
I will look for the information and come back with it, if that is acceptable.
In a few minutes, I am unable to find direct information, but this is the testimonial page from Interlube... http://opti2-4.com/index.php?dispatc...ew&thread_id=6
They have maintained an enforceable warranty on their product for over 25yrs...