Hi, so i picked up this 2000 f4 the other day and i can't tell if the Muzzy that is on there is just a slipon or a full exhaust..I just replaced the carbs with another set of cleaned f4 carbs that have stock jetting in them (140s and 135s) and it seems as though its getting too much air..it almost starts on full choke but i have the airbox off right now..Does having the airbox off give the bike that much more air?

 

i guess ill just switch out the jets from the carbs that came with the bike..lol

 

try taking a photo of the headers..... posting it up here

 

i have identified them to muzzy headers..i just looked up some stock stuff on ebay and then the muzzy headers and found them to certainly be muzzy stuff..Thanks though!