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 - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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