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Originally Posted by sportpsyc
I noticed that it only pours gas out whe nin the PRIME position on the petcock. It still won't run even in the ON position, so perhaps it is a vacuum leak. Interesting thing, that vacuum line to the petcock--I thought it was gravity that got the fuel there, but I am really curious what role that vacuum line plays in the operation of the petcock and carb. I'll check that. Will the bike run with that petcock vacuum line plugged? Curious...
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We've been over this before.....at least the vacume part of it........Jonathan....... :roll:
The vacume line does NOT pull fuel anywhere....or push it for that matter.
Gas goes from the tank to the carb by the force of gravity........only.
What the vacume line DOES do is open a little valve inside the petcock and allow gas to flow in the ON and RES positions .......only when the engine is running and vacume is present. Or to put it another way, when vacume is absent, the fuel is shut off.
The PRI setting defeats this safety shut off and allows gas to flow even when the engine is not running.
After looking at the service manual, it appears that what I said before about the tube coming off the bottom was wrong. It is only a drain and not a vent/overflow.
Looks like the tube you are referring to IS, in fact, the vent and overflow so we are back to something wrong with the floats or needle valve. Can't be much of anything else. Although the inlet and vent hoses are right across from each other, I don't think there is any direct path for fuel between the two.......unless the body of the carb is physically damaged.