MY BIL has a three cylinder carbed 1200 cc engine about 2003 vintage, the engine is just about impossible to start cold, we have to spray ether directly into cylinders, but once started runs fine and restarts good. Any ideas? I'm not that familiar with jetski's yet. I did open his gas tank cap with the idea of a vac lock and that did not help any. Plugs are dry and don't appear to be getting any gas in cylinders during cold start.