Some of the older Ducati stands were like that. It was to prevent riding off with your side stand down & causing on accident at the first left turn. Most modern bikes have a side stand switch that cuts out the engine if the bike is put in gear with the stand down. Some bikes won't even start in neutral with the stand down. A pain for warming the engine up.
and guess what part ive decided is making my 650 cut out whenever i give it the gas? well, sometimes... does freak the oldies out when first you gun it, then second, do about five backfires as the ignition cuts out, then cuts in, then out, then in, then out.... also impressive when you pop wheelies at the lights....
usually its ok...its just at that crucial moment you need that extra power that it decides to do it..... ie, with oncoming traffic...
but when it finally died altogether the other day(rush hour, and in the centre lane of course) then started fine with the stand down, but cut out as soon as i kicked it up.... i knew it was tha switch that cops a lot of water and grit and very little TLC.....
my pissa ****** yamoto had the "safety' switch that prevented 'on stand warm ups'....cure....remove the ******* wiring to the switch
that really sux.... not being able to start a bike with the stand down at all....
but when they spring up of their own accord? screw that for a joke...if it doesnt lock down, its just stupid....first thing you should learn...lift the stand up when taking off...