Been working on figureing why i have no fuel to pto piston. New spark plugs, triple pump has fuel at line to pto carb. Pulled high adjustment screw and blew air through with my mouth. starts on one cylinder (PTO) when i pour fuel in carburator. Im stumped on next thing to do, guess Im gonna pull carbs. Only have about 30 hours on carbs after rebuild. i just replaced that piston and rings and put new gaskets on all 3. Mag and center both work... Compression is 125 on pto, 135 on center and mag. Not sure if pto ring has seated yet. Any thoughts trouble shooting before I pull carbs??