stalling when rolling on the throttle (carbed 900)?

[koko64]

That's great. Another cheap option for OEM parts.

Mines a simple on-off petcock (OEM 1995), but if it dies I know what to replace it with. Can only imagine what a new OEM petcocks worth.
Similar story with the OEM fuel pump. The Mikuni rectangular pump is nearly a hundred bucks cheaper (here).

I hope its just the petcock.

I'll stay tuned to see how you go.

[Raziel]

I know this is an old thread but I'm having the same issue and wonder what the problem turned out to be... did replacing the vacuum petcock with a manual shut-off solve the problem?

[junior varsity]

uh, i'm not sure. See, i pulled the carbs and cleaned them, replaced the vacuum petcock with manual, replaced the fuel pump with a fresh replacement, replaced all lines, tossed out old and now-clean carbs and put on flatslides, had intake manifolds ceramic coated and reinstalled with fresh gaskets, made a carbon fiber battery box... and the problem seemed to disappear. I suggest maybe only one of those things was the issue.

[Raziel]

Clearly my non-carbon fiber battery box is the culprit! 

[junior varsity]

exactly. i highly suggest killing the gnat with dynamite.