Hi, I've just bought a bike (my first bike), it's a Yamaha Scorpio 08 (Still under warranty) When I start it up I need full choke I then reduce it to about half and let the bike warm up. If I try to take the choke all the way off (or move it to less than half way) the bike stalls, even if I have been riding for an hour. Also in terms of fuel economy I am getting about 200km per 10L which seems pretty high considering it is only 223cc and I'm not thrashing it at all. Am I right in assuming that something is wrong? Should I be taking it to a mechanic?