I have a 95 ZR 700 with the exact same problem i have stock carbs aftermarket PSI twin pipes and it has been ported. I have to jet it 10 sizes smaller than what it is supposed to be just to get away from the bog but i'm afraid im going to melt it down. I have rubuilt the motor twice, not the problem, checked the slides, needles, brass, chokes, not the problem all where they should be. Changed the CDI, and coil,not the problem, checked all the wiringnot the problem however I may have diagnosed what it is. TRY THIS. Take a timing gun and hook it up to a good battery that you have lying around and hook the spark lead up to the mag side sparkplug wire. now start the machine and watch the timing marks. Rev the machine from idle up to about 6000 rpm( this must be done with no belt on) if the timing marks go clockwise as you add rpm (when standing on mag side of sled) this means that the timing is retarding itself. THIS IS NOT RIGHT!!!!! It should be advancing itself with more RPM. Right now my machine is in my loacl Arctic C
at dealer and they are trying to find out what the hell would cause this everything checks out EXCEPT the timing. The mechanic has contacted Arctic Cat Inc. and is awaighting there reply to see if they can diagnose the problem. I know the last 3 owners of this sled and they all say that it has always done this, but everyone all sank money into it and couldn't get rid of the bog. the machine starts good idles good and at wide open throttle hold on, but it has ALWAYS had this problem. As soon as I here back I'll reply with any info but until then you might want to TRY THIS!!!!!!