We picked up a 2005 CRF150F in good shape and very little use. It is a beast to start. We took apart the carb, cleaned the jets (it had sat for a while) but are still having problems. It is really hard to start. Once it starts and warms up, it runs great but it takes forever to get it going. If once it is going you choke it, it kills it immediately. Not that it should keep running or that I would want to, but it seems strange. I'm wondering if it is running too rich. Maybe it is like it is choked in the normal position. Or maybe I need to check the valves (we haven't done that yet). Any suggestions? Thanks!