88 VMAX tune up question...

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  • Eli69
    Forum Sage
    Past Site Supporter
    • Aug 2005
    • 4856
    • Wyoming County, New York
    #1

    88 VMAX tune up question...

    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?


    2002 bmw r1150gs 1978 gs1000E skunk les pew 1982 GS1100
    1980 gs1000G the ugly RLAM
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    • Guest
      #2
      Originally posted by Eli69
      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 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/

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        • Eli69
          Forum Sage
          Past Site Supporter
          • Aug 2005
          • 4856
          • Wyoming County, New York
          #3
          Next question... Cylinder 2 (right rear) seems to be misfiring. Spark is good. Is there anything different about #2 that might cause misfire? Like an extra vacuum line...?
          2002 bmw r1150gs 1978 gs1000E skunk les pew 1982 GS1100
          1980 gs1000G the ugly RLAM

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            • LAB3
              Forum Sage
              Past Site Supporter
              • Mar 2018
              • 3494
              • No fixed address
              #4
              Originally posted by Eli69
              Next question... Cylinder 2 (right rear) seems to be misfiring. Spark is good. Is there anything different about #2 that might cause misfire? Like an extra vacuum line...?
              I've had a Venture before, very similar setup. As with any bike that age I'd be looking for a vacuum leak where the intake boot mounts onto the head, mine where all shot and despite what the folks on the Venture Riders forum told me an ordinary o-ring from the hardware store won't cure the problem, they're too thin to fill the groove.
              2001 Kawasaki Voyager XII (Current bike)
              1982 GS450txz (former bike)

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                • Guest
                  #5
                  Originally posted by Eli69
                  Next question... Cylinder 2 (right rear) seems to be misfiring. Spark is good. Is there anything different about #2 that might cause misfire? Like an extra vacuum line...?
                  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.
                  http://v4musclebike.com/forums/showthread.php?t=9801
                  This is the direct link to the manual download. http://www.mediafire.com/file/edvviq...ice+Manual.pdf

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