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I worked on a couple and but had to change the thermostats on both so I didn't bother with the petcock. This may help. https://www.vmaxforum.net/threads/coolant-change.12048/I'm doing a tune up on a friends 1988 Vmax. There is a valve in front of the motor that switches coolant from run mode to drain mode. The markings on the front of this valve are slightly disfigured. I assume (from the shop manual) that there is a drain off and a drain on marking but all I can see is the word "drain". I'm hoping that I can tell which way the valve is directed by whether or not the word "drain" is upright or inverted. Has anyone dealt with this?
I wish I could answer your question, but I haven't had to dive into a set of VMax carbs yet. Being that it is an 88 you might have a crack in a line somewhere. Have you checked the valves yet and then carb sync? They look like a nightmare. Here is a link for a VMax forum with some links that might help you out. I downloaded the manual and it appears safe, though you have to get past a couple of supplemental manuals before you get to the meat.