Sounds like the side stand switch staying open circuit then, if it is the engine normally runs until you put it in gear which seems to be what you're saying the problem is?
It should be easy enough to find on the side stand bracket unless it's caked in a large blob of deposited chain grease. Although I did once buy a ZXR750 dirt cheap as a non runner and the guy just hadn't realised the side stand switch had been wiped out on a kerb when the bike had been knocked off the stand by a car.
I'm not sure about how many differences there are in the wiring, the early ZXs were almost identical to the GPXs. Is your GPZ750 the 6 speed sleeved down 900 or an earlier air cooled version?
I have wiring diagrams for the ZXs I could email you and have a mate who is into air cooled GPz 11s who might have a diagram for the earlier 750s but couldn't help if yours is the last of the GPZs.
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