i have a bill blue pumper carb. it was jetted for the muzzy full exhaust. it ran fine bottom to top. i sold the muzzy and put the stock header back on. i'm getting the FMF Q4 slip-on. do any of you think i'll need to drop my main jet size?? i think it's a 137 with anenlarged air box lid hole.i think that it'll be running rich. i won't really know until i run the bike for a bit so i'm just curios to hear what everyone thinks.

 

Is the Bill Blue the TM or FCR

 

the bill blue TM.

 

I would bet you will be a little on the rich side. Will it accelerate cleanly in 5th up to redline, and in 6th does it seem to keep pulling? Pull off the airbox lid and try it again. Which way is better? That should point you in the right direction.

jb7

 

we'll see once i get the pipe.

 

Hey how do you like the Bill blue carb? I have a klx250 with frre mods and fourstroke works header and muffler and I'm looking for some more low end snap. I on the fence between the tm or the fcr

 

i've had it for quite some time nowand am so used to it that i can't remember what the stock carb was like. i do reacall that there was a small increase in throttle response when ifirst put it on though. a $300 increase in power? no... but they do say that it's more about response off idle that overall power... if i were doing this all over again i would go with the big bore kit instead.