I have a 92 XP that is a work in progress. It sat for a couple of years before I got it. I have had the carbs professionally rebuilt, dumped all the old gas, replaced the fuel filter and it still will not rev up. It starts fine, but when I give it throttle it dies. If I feather the choke I can get it to run, but its hard to drive with one hand and play with the choke with the other. The fuel lines have been replaced with black ones and I have bypassed the fuel selector valve. Sounds like fuel, but I don't know what else to try. Compression is 120 on both cylinders.