markvictor wrote:

The shift interrupt should Not cut out the ignition

Yes, it should... not entirely, just enough to shake the clutch dog off
the gear.

if the cable is in
good working order AND adjusted correctly. The purpose of the interrupt
switch is to prevent damage to the drive from the throttle opening
before forward or reverse gear is engaged.

Different adjustment.

A number of models did not
come supplied with interrupters at all.

Alphas?

I would check the adjustment,
if incorrect, adjust to spec, if still sticking then check the lower
shif cable.

The most likely problem.

Rob