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 - The Revival of a John Deere Combine - by The Red, John Fritz. For several years I had been driving by a farm house on the west side of Indianapolis that had a John Deere combine parked in high weeds in a lot behind the house. The gentleman no longer farmed because the entire area was developed with housing and light industry. I had stopped several times and knocked on the door but no one would answer. My curiosity was up and I wanted to contact the owner. I wanted to see what he planned to do with the combine.
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