OK I bought a 1989ex500 GPZ. an it only ran if the choke was on. but is would run on high rev like it was so-post-to, so I was thinking it might be the carbs, an the old gas, ect. so I cleaned out the carbs the vacuums, an the take. I am going to adjust the valves next week. if this does not work to fix the problem do you know of any other solution?