....and you were saying bikes haven't been kind to me!!
For me, that would be a carbs out jobbie to investigate proper. Maybe you could manage to blast some air through the lines if its crud sitting on the valve seat and keeping the value open, but since there is a fuel filter in place, It's more highly likely that the problem is mechanical and not crud.
I'd be looking at probably your float height tab getting either set wrong, bent slightly by mistake, or your float just went kaput. When yer dyno guy worked on these carbs, I presume he had them open to check and play around with them so that the were in good condition before fitting them. But in his favour, if he adjusted the float wrong or bent the tab by mistake, you would have had the problem from day one. So maybe yer whole float is just kaput or sticky.
Other than than that, I'd be looking at the other likely scenario of the valve and seat worn and not creating a proper seal when closed.
It maybe possible (I did it on a old Z900) to remove the float bowl with the carbs still on and bend the tab a little to adjust the float height, but this is not very accurate and more of a "hit and miss" way of adjusting it. And it would only apply to the outer carbs as the inner ones are a bastard just to adjust the pilot screws let alone get all the float bowl screws open with carbs on.
And as an after thought....I dunno the "ins and outs" of the fuel pump, but I presume that there is something like a valve that closes on the fuel pump until it senses it need to pump more fuel????. Is it possible that if this valve failed, that fuel would continue on and create pressure on the float??? Maybe it is an area that might warrant investigating too if the other avenues draw a blank.
Pain in the hole problem.
For me, that would be a carbs out jobbie to investigate proper. Maybe you could manage to blast some air through the lines if its crud sitting on the valve seat and keeping the value open, but since there is a fuel filter in place, It's more highly likely that the problem is mechanical and not crud.
I'd be looking at probably your float height tab getting either set wrong, bent slightly by mistake, or your float just went kaput. When yer dyno guy worked on these carbs, I presume he had them open to check and play around with them so that the were in good condition before fitting them. But in his favour, if he adjusted the float wrong or bent the tab by mistake, you would have had the problem from day one. So maybe yer whole float is just kaput or sticky.
Other than than that, I'd be looking at the other likely scenario of the valve and seat worn and not creating a proper seal when closed.
It maybe possible (I did it on a old Z900) to remove the float bowl with the carbs still on and bend the tab a little to adjust the float height, but this is not very accurate and more of a "hit and miss" way of adjusting it. And it would only apply to the outer carbs as the inner ones are a bastard just to adjust the pilot screws let alone get all the float bowl screws open with carbs on.
And as an after thought....I dunno the "ins and outs" of the fuel pump, but I presume that there is something like a valve that closes on the fuel pump until it senses it need to pump more fuel????. Is it possible that if this valve failed, that fuel would continue on and create pressure on the float??? Maybe it is an area that might warrant investigating too if the other avenues draw a blank.
Pain in the hole problem.