The problem has been fixed. I replaced the ignition coil assembly that tested bad, and I spliced a severed kill wire that led to both coil packs.
When I lifted the engine cover to get to the coil packs, I saw that the kill wire was broken. Weird, right! No rodent marks or signs of heat-related...
I have all but eliminated a fuel supply problem. Tomorrow I'll be testing to see if a cylinder is dropping. I have an ignition coil assembly ordered and on the way because all indications (not listed here) lead to that. I will update this when I learn something – for the sake of future Googlers.
My Gravely ProTurn 148 with Kawasaki FX691V runs perfectly for 30 minutes then begins to slightly surge a little. As run time increases surging increases, and it begins to act as though I were slowly increasing the choke handle. Like it wants air. For instance, when I disengage the blades then...
On a Gravely Pro-Turn 148 with a Kawasaki 691V engine I've replaced the voltage regulator because my battery drains after a few mows of my 3 acre lot. The stator is sending 33 AC volts to the new regulator, but the B+ post on the regulator is registering only 11.9 DC volts output (if I'm testing...