You should buy (or borrow) a Bullet manual,and familiarize yourself with the basic engine components,what and where they are,and why and how they work...you'll be glad that you did...The choke (enricher) is a bit confusing...when you pull it UP,it's off...I rarely have to use mine...when you push it DOWN,it's on,and that's why your Bullet quits...I only have to use mine when it's really cold outside,and the Bullet has been sitting for a couple of days...and as far as horns go,you can get a really loud one on eBay,or from CMW,or J.C.Whitney...I think that I'm going to get a nice,loud "Ah-oogah" type Klaxon horn...they're not too expensive...and it looks like your seat is just like mine...where did you get it?