If the spark is "disappearing" as you say, then there is a problem with either the cap, rotor, or wires. Something is drawing down the spark. The rotor can have a pinhole in it that can short the spark to ground. Sometimes, the offending hole or carbon track can be impossible to see. If you have a spare rotor, try that and see if anything changes. The cap can have carbon tracks in it or on it either inside or out. Outside ones show up in the dark, inside ones are harder to see. Again, if you have a spare cap, it may help. Wires: Check the resistance of the wires. Something in the neighborhood of 6000 to 10000 ohms is good for a resistance wire, and near zero for solid wires.
In ANY case, your spark is either being drained off by a short/partial short or not getting through because of high resistance. Without good spark, fuel, timing, and compression are irrelevant.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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