I got a better one than the pto. Went to start my 126 today, get it ready for its winter nap (run gas out, etc.). Noticed the right front tire low, looked in the tank to see if there was gas, there was. Tried to crank it, no power, had to jump the battery. Then it wouldn't start. Remembering the old "fuel, air, spark" troubleshooting method, removed plug, had a spark. Thought, well I had spark, saw fuel, only leaves air. Removed air cleaner, still no start. Put a straws full of gas in the carb and it tried to start. I saw fuel in the fuel filter glass, figured it must be a clogged fuel line. Anyway the problem was with the RH front tire. It lowered the RH side, the fuel tank had only enough fuel to coat the bottom of the tank, the fuel I saw in the glass was below the level of the outlet tube, I had a straight through line with no fuel in it. Pumped up tire, added gas, started engine.
But you know what Brian, the worst problem is when (especially on a narrow frame) you work on something put it all back together and notice you left out a part that you should have put on first.