"If it is the condenser opening up when warm would it stop the engine with no spark to either?"
It can happen that AFTER a warm up if its the ignition going dead stopping running IT CAN BE A COIL OR CONDENSOR PROBLEM
However, to straight steady DC a Condensor is already an OPEN CIRCUIT once charged up, and Id think more it may be SHORTING once warm which will indeed kill the spark. The ignition can still spark with an open condenser or no condenser at all, but the spark is weaker plus the points will burn up quickly. However, since a condenser is so cheap, ID TRY A NEW ONE FIRST
"If I add another condenser, assumed good, parallel to the first will that possibly rule out the condenser being bad or not?"
I WOULD REMOVE THE SUSPECTED BAD ONE AND TRY ANOTHER I would NOT try and add one in parallel cuz a short in parallel is still a short
Immediately when it stops you need to pull a plug wire and see if its still firing or not. A coil can fail once warmed up but yes they are expensive.
When it stops is it still getting a good gas flow to the carb??? I have seen gas tanks that aren't vented which can cause an engine to die after a time due to no gas. Or a clogged fuel filter???
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Today's Featured Article - A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T
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