Vintage Karting Forum

Doug, it simply opens the circuit between coil and points, so that the spark is provided strictly by the magneto, minus the points and condenser. The switch was a "temporary OFF" pushbutton, akin to a car door switch. Pop used a "temporary OFF" roller micro switch for his "no wires" setup. It was a PITA to set up the throttle pedal override, but it worked on all his super engines, from Mc10, to stroked Mc10 and on through his Mc40. TJ

Doug,

If a five degree flywheel is used it becomes critical to delay the maverick spark until way up in the power band otherwise detonation is likely to occur. Thus the need to have the spring tweaked to cause the tension to be at least 20oz and preferably 24+.
Steve O'Hara