I have a kohler 15hp ProCommand, single cylinder engine on my Exmark w/b mower. The engine has many hours (at least 2,000, maybe 2,500), but still runs fine. I had a problem today, and am asking for a clarification on the spark plug wire. Today, I fired it up and loaded to the trailer. On the first job, it didn't start right away. This was unlike the usual routine; usually it starts well at full choke when cold. I checked the safety devices (blade engagement, hydro control), and all was in order. After extensive cranking, it finally started. It ran well for that job. On the next job, it started well and I mowed one of two adjacent properties. I shut it down to do some other tasks and then went to restart. It did not start again. After much cranking, I am perplexed because this behavior is unusual. I thought perhaps the spark plug was dirty. I pulled off the wire and was surprised when the wire came out, WITHOUT the plug connector. The barrel connector is still attached to the plug. I used narrow nosed pliers to get it out. I did take out the plug, and it looked pretty good. I wire brushed it down and reinstalled. Now, I have the connector and the wire as two separate pieces. I scooted to boot down the wire. After some examination, I finally concluded the connector is merely clamped onto the wire cover, not directly attached to a center wire. I opened the clamps a bit, inserted the covered wire, and clamped tight with a pair of ViseGrips. And, I reattached to plug, then scooted the boot back down over the barrel connector. On the second pull, the engine fired up, and it started well several other times following that brief diversion. My question: Is my assessment right about the barrel connector being clamped over the cover part of the wire, without any direct contact with a center hard wire? I will keep it the way it is for another day or two. If I have repeated problems, then my next step is a new ignition coil. Since the engine started and ran fine afterwards, I can attribute the change to one of two possiblities: (1) The spark plug needed cleaning, or (2) The connector had worked itself loose and the contact was not good enough for the spark current to flow through to the plug; reattaching and a new clamping procedure fixed this matter. Anybody have any observations or comments?