[john hall]

Cranked it up today to check the new coil, it's still not running that great. Maybe a little better, but far from what it should be. Alternated pulling plug wires with it running for a few seconds. Right side backfired once when I hooked it back up, it did that last time I tried this with the old coil. Maybe a connection with what I found when I pulled the valve covers to check clearances. Some body has been in there, found the mesh matl from the breather in with the valves instead of on the other side of the reed valve! I checked valve clearances, left side intake .003, right side around .008. Both exhaust around .01-.012---appears right for the ser# break. I plan on trying some Marvel Mystery oil to try to free up a sticky/lazy valve. Outside of that, time to pull the heads and see if I can find anything else weird or do you guys think this is carburetor issues? I hate these types of problems that can be anything. Only thing I am sure of right now is I have good strong spark--both firing about 1/4" simultaneously with my tester. Yes the fuel is fresh and the plugs are new (acted up with the old ones as well).
Anyone want to throw a dart at the wall? How much trouble is it to put a KT17 carb on it? I have one that hasn't been used in 10 years....