15 degree may kick back when you try to start the engine but if it doesn't knock when idling it may be okay. I would check to see after running it with the new ignition and shutting if off to see if you can turn the rotor in the opposite direction of rotation to see if it moves back any. If you took the weights out you may have one that is stuck holding it at 15 degrees or if one of them has a flat spot on it holding it in the advanced position.
At idle an engine doesn't need to advance the timing much. The purpose of advancing the timing is that the fuel mixture only burns so fast no matter what speed the engine is running. The faster the engine speed the sooner the fuel needs to be ignited so the fuel is at it's maximum force when the piston is in the best position to take advantage of this force. This is the purpose of advancing ignition timing.
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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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