air/fuel mix screw

[jhr400EX]

This question will probably make me look stupid, but which screw on the carb is the air/fuel mixture screw? I am thinking i might have to adjust it for the colder weather. The only mod I have is my pipe, and I am running stock jetting. It ran fine in the warmer weather, but now that it is colder it has been backfiring when I let off of the throttle. Thanks for any help.

[ill_lil_romey]

Bump... I would be interested in this also.

[jb400exxx]

it's on the bottom. it's kinda hard to get to with the carb on. turn it out in 1/4 turn increments at a time and see what it does.

[ill_lil_romey]

I know where the screw is. I just wonder is that would fix my problem I.E. ( JETTING HELP) its on here somehwhere

[jhr400EX]

bump

[cals400ex]

try changing you main jet also. with the big gun pipe i think a 152 is recommended for the slip on but not sure for the complete. this will not help for starting probally but may help the backfiring. the bike should also run a little better and not be so lean.