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The only problem with an SR magneto - it is more difficult to mount it on the motor.  I used to have a welded platform under it and an adapter where it needed to seal to the crankcase. It was worth the effort. If you have a miss in the motor, you need to fix it - if the ignition system is suspect, things become much more difficult. I tune my engine by forcing it to miss. When you get the miss, you have gone too far when leaning-off.