Recently rejetted/tuned carbs won't start when choked.

[nculver]

Hello all!

I have a 77 xs400, and I am having some issues I know you all can help me with!

I recently (had a mechanic) rejected my carbs. When I got the bike home, I balanced the carbs, and reset the air screw to the recommended settings (3 turns out). The bike runs SO SO good... once it starts. Before I started messing with everything, it would start on the 1st or second kick (electric starter doesn't work yet). Now that I have the carbs 'tuned' it won't start with the choke knob out, it only starts with the choke knob in, and I have to turn the throttle a little. Several kicks later, it will finally start. As soon as I pull the choke knob, the RPMs shoot way up. I am assuming this has something to do with my air screws, maybe my idle setting.

Once the bike is warmed up it idles around 1500, and I didn't really do much tweaking of the air screws, maybe out a half a turn, I can't really remember.

Have any of you ever experienced anything like this before?

Thanks in advance!

 

[Forde]

I experience the exact same thing pretty frequently. Has anyone determined a cause in the past three years?

 

[BBS360]

Would have asked the original poster why he messed with it after his mechanic had it running well.

What have you done to your bike since it ran well?