Tire sizes are 110/70 front, 150/60 rear. Your gearing is right, I think they went to 46 on the rear in 93, 91-92's were 47, I'm running a 50 on the rear but it's a race bike. If it won't idle the pilot jets are plugged, the holes in these are tiny, first thing to varnish up when you don't put fuel stabilizer in it in the fall like you should. Only sure fix is pulling the carbs and giving them a cleaning.