I have 1 1993 Yamaha 9.9 that starts hard. It will start & stall several times, once warmed up she is great. I noticed if I cover the air intake slightly while starting cold (like a choke) it runs better and will not stall. There is no hand choke on this engine.<br />Question, how does this engine choke to start as it seems like it is not doing so, what do I need to fix? thanks.