check the coil(s) or cdi box if it has one.

 

Congrats on your 4,500th post lol

One coil runs 1&3 the other runs 2&4 .... 3&4 are the problematic ones.

CDI box??

 

ignition control box basically. Not sure if the F2 n F3 had em of not. F4 up does tho i know.

 

i'm thinking it's got to be a fuel issue also. if you can restart if after it's stalled, somethings not right. when my carbs were clogged I wasn't able to start the bike back up. have you checked the ignition coils? I know it's been brought up but wouldn't hurt to check i suppose. Where's hershey when u need him. lol

 

I haven't checked the coils, but it wouldn't explain why 3&4 are the only problems i have. 3&4 are ran off of different coils

 

it is a gravity feed system cv carbs use vacuum to operate the air intake potion of the carb not suck fuel into the carb gravity or a fuel pump in your case there is no fuel pump so gravity is what is working against you if your line is not fed down with no loops or drastic bends TA DA you have a problem!!

 

dont bother taking apart the petcock because if it wass clogged you wouldnt get any fuel, just disgard the filter, run a shorter line keep it as straight as possible no bends and try that

 

Took the filter out, didn't make a difference.

Either way, doesn't explain why 3&4 would be the only effected.

 

a real head scratcher

 

i am going to read it again to take a closer eye