Magneto impulse coupling

One thing is essential about ignition timing whether it is a curve or static, once it is set and the carburetors have been tuned to suit the timing and compression ratio - the timing must remain stable.
For road work, it is not so important as long as the carbs are jetted a bit rich. But for racing getting the jetting lean enough without doing damage, is important. Those three things are in balance, changing an exhaust system or fuel, can also require re-adjusting the balance. I usually do it by raising or lowering the needles in the carbs. I have a non-programmable Boyer on my bike, I avoid disturbing the rotor.
 
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