I have also had the wire to the points in the mag short out, similar results. Main reaction, don't panic and override the Governor, its not the be all and end all of the R44. But same reason, when the points were put in, the wire was poked behind the condenser and slowly rubbed. Was a bit to track down though, becuase as previously stated, its not always obvious on first inspectoin, so we had changed the Govenor box and tried various other things before hunting this one down. Was just erratic though, it didn't run away past 110%, varied between 108 and 96.
Did have another erractic govenor problem with which the end result was a friction problem with the govenor motor itself located behind the front pax. There is a friction washer that is a factory preset friction, and not (according to maintenance manual) adjustable in the field. Replaced the whole govenor motor and problem solved.
Just as an aside on mags, had two newly overhauled mags put on, and within 45 hours, both went at the same time. Had a rough running engine for approx 8 hours, and was trying all sorts of solutions in discussion with our engineers, wasn't really fouling plugs, timing was good on the ground. Then had one mag fail completely, just on take off roll, and the second go the moment I ran on. Turned out the main set of point in each mag, the wire had been overcrimped, and bent, and a little vibration fractured the wires (Most likely the burping and carrying on that they have a tendancy to do whilst ground running, and then as it go more intermittent, more and more vibration and so on, and evenutally shorted out permanently on the mag casing. Was an interesting afternoon.
chop.