looking for an ignition switch for a 1974 yamaha gpx 433. I think i need what is called a normally closed switch, as far as i can tell the old one would make contact between the two wires coming from the contact breaker points in the magneto when turned off( i may be wrong). I see that on dennis kirks web site they list a switch for a bunch of sno-jet sleds (dennis kirk part# 20211). could one of these work? or maybe one from a lawn mower or something. any help is greatly appreciated.