Kohler SV600 Engine Surging
As winter is winding down, I pulled out the lawn tractor to prepare for some lawn work. The mower struggled to start and failed to continue running. The smell of fuel was over-powering so i ordered a new carburator for the Kohler SV600 engine and replaced the spark plug as well.
Engine starts immediately now but continually surges.
I assumed that it was either a case of fuel starvation or a vacuum leak.
I surmised that if it was a vacuum leak, partially choking the engine would smooth it out, but, in fact, it actually started to choke out.
Interesting fact is that if I'm pulling a loaded trailer, which places a considerable load on the engine, all surging goes away, until the terrain levels out at which point it begins to surge once more.
What am I missing here?