A day ahead of y'all..
I haven't had the JD 170 out and about for a few weeks and the battery was dead. I put it on the charger but it wouldn't hold a charge, so I got a new battery this morn. I put it in and the engine fired right up....but is "surging". The governor seems to be overcompensating back and forth to keep the engine running. It has not done this before sitting for a couple of weeks, the gas is reasonably fresh, month or so, and I need some advice. The engine is a Kawasaki 14hp single, 1990 vintage in a 5sp JD 170. Oil changed few weeks ago, new plug maybe 6 months ago, new battery today. Starts easily, surges from idle through WOT running.