Morning All,
I've been thinking about this one too.
Was the original engine an electric start? It almost certainly must have been.
As Norm says, I can't see how this can be done. The only way I can see to put a cutout on a pull start is:
A time delay circuit that allows you time to start before it cuts out thus allowing you time to get weight in the seat. One big problem is the need for a some sort of power supply to drive the circuit (i.e. Battery). A complicated solution at best!
Some sort of second switch (perhaps just toggle switch on the instrument panel .......or if we want to get crazy a non- returning switch under the seat!! which is activated when you sit down). The idea is the switch is placed in series with the normal seat cutout switch and placed in the off (open circuit position ) for start and once you are in the seat this switch is closed to bring the seat cutout switch into play.
Cheers,
Peter, just re-read the thread before hitting send. You mention switches (plural). I'm curious. Any chance of photos of the system?