He stopped riding it about a year ago when it started overheating. It turns out that it was the water pump. After sitting for this long it just does not want to rev up. We put new gas in it, he cleaned the carbs out. He did say the night before that he could rev it up but on half choke. I am stumped, it seems like the rpms are being limited by the spark but he said it would rev the night before. Also is there a way to test the cdi box to tell if there is something wrong with it. thanks