rc pilet
o.k. add another 50 rpm's almost 7700 on an 18x6 zinger , thats where I'm going to leave it for now .I'm pretty sure it will come up more as it breaks in and I tweak the carb some more.also have to try those 13.5mm carbs I got from poco 242 he had a suggestion on how to fix them so we'll see about that later .good luck .