84 yamaha venture power issue

Discussion in 'Motorbike Technical Discussion' started by Dan Barnhill, Aug 20, 2009.

  1. Dan Barnhill

    Dan Barnhill Guest

    Hey all,

    Have an 84 Yamaha Venture. Has this quirk where every so often when
    firing up the bike - when the start button is pressed, the power to
    the entire bike shuts off. Dash goes blank as if the battery had been
    removed.

    Popping the leads off the battery and then reconnecting solves the
    problem and the bike then starts up fine.

    Yesterday, however, power to the entire bike cut out without any
    prompting from me while I was full throttle down the highway. Had to
    coast onto a thin left shoulder of a busy bridge with cagers climbing
    up my tailpipe.

    Again, I popped the battery leads, reconnected and was able to start
    the bike. Then went 300 more miles on the day without any trouble.

    Before I start ripping things apart - does anyone have any ideas as to
    what's going on?

    Thanks,

    DB
     
    Dan Barnhill, Aug 20, 2009
    #1
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  2. Take a look at the other ends of the battery cables.
    If they respond well to wiggling at the battery end,
    my bet is a loose connection at the other end.
     
    Rob Kleinschmidt, Aug 20, 2009
    #2
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  3. I would troubleshoot the battery buss (1), all the way from where the
    buss gets power from the battery, through the main fuse, on through
    the ignition key, and back to the ignition buss on the fuse panel.

    Sometime the main fuze holder gets hot and oxidized and won't allow
    much power through it.

    Sometimes the ignition switch gets so hot it melts the solder off the
    wires connected to it, and sometimes the switch contacts get all
    burned and oxidized inside where you cannot see the problem.

    (1) Clue: the battery buss is not yellow, but it's powered by the
    battery...
     
    little man upon the stair, Aug 20, 2009
    #3
  4. Dan Barnhill

    anonymous Guest



    Whatever is the problem, don't ride the bike until it's been
    correctly fixed. Your highway experience was a warning.
    Don't wind up in the morgue.
     
    anonymous, Aug 21, 2009
    #4
  5. Dan Barnhill

    Schiffner Guest

    Buy the shop manual...the RTFM. Pay especial attention to the
    electrical section.
     
    Schiffner, Aug 21, 2009
    #5
  6. Dan Barnhill

    Schiffner Guest

    Hey if I can stumble through a clymer book reading the eletrical
    systems and sorting it out following the "tree" and troubleshooting
    directions they give...anybody can do it and no I'm not joking...
     
    Schiffner, Aug 21, 2009
    #6
  7. I much prefer Haynes for electrical troubleshooting.

    My Haynes manual has color diagrams while my Clymer
    is all black and white. Makes a world of difference.
    The Clymer is way old, so this may have changed.
     
    Rob Kleinschmidt, Aug 22, 2009
    #7
  8. Dan Barnhill

    Schiffner Guest

    and mine was written in the 70's and I was an inexperienced 16 y/o.
    Got the headlights to work though...using a clymer no less. I consider
    me lucky.
     
    Schiffner, Aug 22, 2009
    #8
  9. Like I said, if you get the chance, treat yourself
    to some color wiring diagrams. The whole picture
    suddenly gets way clearer.

    Clymer's artwork generally sucks. Haynes OTOH
    pads their already skimpy manual with boilerplate.
    My shafty BMW manual tells me all about changing
    drive chains for example. The diagrams and photos
    are way, way better though.

    My bet on the Yammie is still a loose battery cable at
    the end not connected to the battery.
     
    Rob Kleinschmidt, Aug 22, 2009
    #9
  10. Dan Barnhill

    Schiffner Guest

    agreed...there isn't much to a T-500 but they seem to leave one
    hanging.
    Not the one for my wing, only colour in it is me highlighting the
    black and white(why aren't there 64 colors of highlighters?)
     
    Schiffner, Aug 22, 2009
    #10
  11. Dan Barnhill

    Schiffner Guest

    IIRC the only manual other than a shop manual for that particular
    motorcycle (Suzuki T-500) was the clymer. Nice thing is they tell you
    some basic porting settings AND give dimension for a set of tuned
    pipes that supposedly work well the the port and piston mods. 8^) The
    part about the brakes was spot on and I ended up with braking that
    could let me out brake RD400's and GT-500's. I've alwasy been a setup
    the suspension and brakes FIRST kind of guy...worry about the power
    when the chasis can handle it.
     
    Schiffner, Aug 22, 2009
    #11
  12. I actually approve of this sort of approach.
     
    The Older Gentleman, Aug 22, 2009
    #12
  13. Dan Barnhill

    Schiffner Guest

    2 wheels, 4 wheels...it's the same to me. Only the dynamics get more
    interesting when you have just 2 wheels.
     
    Schiffner, Aug 22, 2009
    #13
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