I have a CNS it's junk the older carbs are better and more adjustable. I broke the glue by heating it then was real careful with the exact size flat driver to pop them loose. Even with that it took some tinkering. I Can go up to 30 but 25 seems top Cruz with my 190 lb butt on a land yacht cruzer w49cc skyhawk. My next build will be using the old style carb. No choke cable just a flap. A new old style carb is like 15 bucks new on eBay sometimes 9 bucks. Check around someone will hook you up cheap with an old style carb. Keep tinkering.