04-12-13, 05:51 PM
It's almost certainly the sidestand cutout switch. Squirt some WD40 on the little plunger that should be getting pushed in by the stand and check it's connectors. I've had both a ZZR600 and a ZZR400 in my garage that suffered from this -sorting the cutout worked in both cases. (after I'd had the carbs and airbox out twice trying to find a problem) Don't ask me why the cutout affects it this way, it befuddled me too.