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



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