When  under compression, the plug requires twice the voltage to fire.

 Briggs  & Stratton air gaps cannot be made too wide to prevent spark
 providing  the coil is healthy and the engine is spun over fast
 enough. A wide air  gap, say .030" will ever so slightly retard the
 ignition timing as the  magnetic field takes longer to build within
 the coil  windings.

 B&S

 Cut the ground electrode off even with the centerline of the center
 electrode. Leave a sharp edge and bent the ground down to get a
 .015" gap.  Now anyone can start it.

 Years ago we put a normally closed switch in line with the points on
 racing Carts. About half way down the straightaway you push the
 button and open the  points circuit. Now the magnets a moving past
 the coil so fast, there is no need  for a primary winding. The
 secondary fires the plug directly. Need to be above  15,000 RPM.
 Called a Maverick ignition system. It also added advance. Add Nitro
 until the head melts, then back off just a bit.

 Lynn E. Hanover

  So Lynn,
Does the second paragraph work on rotor motors?  :-)))

Dale Davies

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