Charon
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OF, I am not trying to pick at you, and I appreciate your effort in trying to find the extent of the problem.
Vacuum petcocks have been on a heck of a lot of motorcycles, of most brands, for at least thirty years. As far as I know they have not caused serious safety problems, and a lack of power in traffic is a safety problem that has been addressed by the NTSB is more than a few cars. In fact, the lack of power has also been addressed by the NTSB in motorcycles, but not in relation to vacuum petcocks. I am not referring to "lack of power" in the sense of a moped on the freeway, but in the sense of failure to deliver power when called on to do so. True, vacuum petcocks do fail, but so do fuel pumps, solenoid valves, and most other mechanical/electrical parts. I have even had failures (mostly leaks) in mechanical fuel valves (such as the Raptor).
In any case, the vacuum petcock is a dying breed, as is the carburetor. Both are slowly being replaced by fuel injection.
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