Hi madjap,
what happened on my XS11 (same carbs except there's 4 of them) was one time when the bike ran out of gas (on purpose, I was checking how far it'd go on reserve) and I poured in my jerrycan of gas one of the floats had sunk down far enough that the float needle tilted and jammed.
Luckily, whacking the carb with a screwdriver handle jarred the system enough (and perhaps the foul language helped) that the gas fountain stopped flowing.
Just perhaps, with you being forced to use aftermarket parts and all, it's that your floats/needles/seats would work OK if the floats didn't fall so far?
Perhaps a chunk of something put in the bowl bottoms?
what happened on my XS11 (same carbs except there's 4 of them) was one time when the bike ran out of gas (on purpose, I was checking how far it'd go on reserve) and I poured in my jerrycan of gas one of the floats had sunk down far enough that the float needle tilted and jammed.
Luckily, whacking the carb with a screwdriver handle jarred the system enough (and perhaps the foul language helped) that the gas fountain stopped flowing.
Just perhaps, with you being forced to use aftermarket parts and all, it's that your floats/needles/seats would work OK if the floats didn't fall so far?
Perhaps a chunk of something put in the bowl bottoms?