So most info I’ve read mentions 1/8 on the high and 2 1/2 on the low as a staring point. This is a big difference from what you mention on your earlier post but in fact my sons cadet kart seems to run better with a leaner low and a richer high, leafing me to believe that most motors will run at very different settings. Of so, what is a good way to find the specific setting for my sons kart. Another statement I’ve read is that these motors should be running around 450 CHT, I am lucky if I see 390CHT. Any info on this would be great.
Try low 1-1/4 and high 3/4 and I think you’ll find that rich enough for a new rebuild. Your final race setting might be something like 1 turn low 1/2 turn high. Just make sure the fuel tubing connection at the carb doesn’t leak air and don’t take the spark plug out when the engine’s hot.