wondering what all of you guys run and where is a good base to start, i already have a 42 pilot, because of that fact of rough starting and such, as common with the 400's

what main should i run for the SPARKS X-6, i belive the 42 will be good. also should i take off the air box lid, and or get a EHS racing lid?

thanks

v581

 

help....

 

i ran a keihin 158 mainjet with my x-6 and modded air box lid. i would get the air box lid or by a gt thunder velocity stack instead of removing the lid, but that is me. i honestly like the velocity stack and that is what i currently run. the temp and elevation matter with jetting so it might vary from here to there.