[cubfixer]

I agree with Jayjay - let it run for a couple of hours.

Also I think that we may need to discuss dwell angle in these engines. The dwell angle is adjusted by setting the points gap to a specific gap at maximum opening. A narrower gap gives more dwell and a wider gap gives less. Excessive dwell (points gap too small) means that the points close too soon after opening, cutting off the magnetic field collapse from the coil before it delivers all its energy to the plug. Too little dwell (points too wide) gives the magnetic flux insufficient time to build up to the maximum and delivers a weak spark to the plug.

Both conditions give a weak spark which gets even weaker as the engine RPM rises and produces misfiring at normal operating speeds. The dwell, as well as spark plug gap, do have an effect on ignition timing. The later the points open, the later the spark comes (timing is retarded). The earlier the points open the sooner the spark comes (timing is advanced). That is why timing is the last thing to be set in a tune-up.

I am thinking that we should set the points gap at the maximum opening to 0.020” as the manual calls for. Set the plug gap at 0.025” as the manual calls for. Your manual may be different, since I have a manual for a 125 and a 100.

I suspect that if you are getting a gap of 0.040”, then your dwell is way too short, and your coil is not putting out as hot spark as possible. To increase your dwell angle (and give you the hottest possible spark), set your points gap to 0.020” at maximum opening.

I know that a lot has been written about setting the timing on a Kohler engine, but please remember about dwell angle.