Airhead running a bit odd??

[DrFarkoff]

Worth a check

 

[Kenny]

Well spotted that man !

 

[vanandy]

I'm forever letting myself down, putting my foot in it, missing the obvious, so....what the hell is it? and whats wrong with it?
I'm guess by the size and title its a carb part.

 

[DrFarkoff]

Andy As my Old Granda used to say:- "Only a Foolish man doesn't ask questions!"

They should both look the same but for some reason the one on the left has a very badly worn groove which when the slide lifts the needle does not lift properly and will screw the fueling up at lower revs

I'm forever letting myself down, putting my foot in it, missing the obvious, so....what the hell is it? and whats wrong with it?
I'm guess by the size and title its a carb part.

 

[Wrigsby1]

And what the hell caused that...? A hammer...?...

 

[markjackson]

Oooh… I've never seen that happen before.

The wear on the upper part of the needle looks like it's been 'rubbing' in the needle jet, perhaps causing a bit of stiction that's allowed the cir clip to 'slide-hammer' the top of the groove each time the slide has lifted.

I suppose the jet gumming from yukky modern fuel could cause the needle jet to effectively reduce in size?