big gun exhaust

[WOWA450RRRR]

i purchased a used big gun exhaust for my sons 400ex. my question is that it seems i need a clamp from header to exhaust, is there supposed to to be a clamp of some type or is it just a slip fit. also what jet do we need to go up to.he had a fmf slip on with a 154 main jet. we are in florida about 10 feet above sea level. thanks

[cals400ex]

that slip on comes with a clamp. however, if you don't have one just go get some metal clamp that won't burn or melt.

a 154 mainjet??? i haven't seen one of those. however, if that slip on is the only mod to the bike and the air box lid is on and doesn't have any holes in it, i would run around a 152 or 155 keihin mainjet. remember that if your using dynojets, the numbering technique is different than with keihin jets. so, a 155 dynojet does NOT equal a 155 keihin jet.