Kawasaki 750 GTstarting problems

Discussion in 'Motorbike Technical Discussion' started by Ovenpaa, Jan 21, 2004.

  1. Ovenpaa

    Ovenpaa Guest

    Hi All.

    I have recently acquired a 750GT P1 with Mikuni carbs, the poor machine has
    sat in someone's garage for many years, but has a full service history is
    very nice with only 20,000 miles on the clock.The problem is it sat with
    unleaded fuel in the float chambers resulting in a sticky mess that has been
    a pig to remove, they are now thoroughly clean thanks to copious amounts of
    carb cleaner and a complete strip down, however it does not like starting.
    if you put a hand over the intakes it will eventually start and runs quite
    nicely, when warm it will idle and rev without issue.

    The diaphragms are Ok and the jets are clean appear undamaged, does anyone
    have any ideas,observations previous experiance of this issue?

    Ovenpaa, Jan 21, 2004
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  2. Sounds like a choke issue.... but I'm sure you've checked that.

    There's a tiny little cam on the choke linkage on the carb bank. This
    actually lifts the slides a fraction when you apply the choke, which is
    one reason why they rev their nuts off on full choke. I'd check that
    this is still A-OK.

    It's on the left-hand side of the carb bank, IIRC.
    The Older Gentleman, Jan 21, 2004
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  3. Ovenpaa

    Ovenpaa Guest


    Many thanks for the comprehensive replies - I will be in the workshop
    Saturday morning to try your suggestions.......

    Ovenpaa, Jan 22, 2004
  4. Ovenpaa

    Ovenpaa Guest

    After further inspection:

    The small brass jets in the float chambers seem to be blocked, as they are
    very fine they cannot be drilled (!) and picking with a fine wire is not
    working. They appear to be pressed in, can they be drilled out and replaced
    as individual units, or alternatively will I have to buy new chambers? Do
    any other chambers fit? it may be worth looking at ebay

    Dont you just hate unleaded fuel?

    Ovenpaa, Jan 23, 2004
  5. They do? Electronic ones? News to me.....
    The Older Gentleman, Jan 24, 2004
  6. Ovenpaa

    norm farr Guest

    I have a 1973 suzuki g/t 550 triple ,,
    I want to put solid-state ignition on it ,,
    the points float too much at high rpm's ,
    does any one know how much $ $ ? ?

    thanks for any help ,

    norm farr, Feb 4, 2004
  7. Try Boyer Bransden in the UK

    Do a google search. Something around 60 UK pounds, IIRC.
    The Older Gentleman, Feb 4, 2004
  8. Ovenpaa

    James Clark Guest

    You mean the triple-spark ignition? (And it was the TR750.)

    Did they remember to include a ballast resistor?
    James Clark, Feb 4, 2004
  9. Ovenpaa

    bob prohaska Guest

    You might look for a Pertronics (or Per-Lux) points replacement.
    I'm not sure the company is still in business, their market base
    must be rather small by now. I've had one of their points eliminators
    in a '72 International Scout for close to fifteen years. Finding
    something that adapts to a two-stroke triple might be a little harder.

    bob prohaska, Feb 5, 2004
  10. Ovenpaa

    Rob Munach Guest

    I believe a lot of car racers are still using them.
    Rob Munach, Feb 5, 2004
  11. The capacitor does more than simply reduce the voltage at the points.
    When the points are closed, the capacitor is shorted to ground, and
    a field builds up in the core of the ignition coil. When the points
    open, this field breaks down, charging the cap. But at this point,
    you have an LC circuit that will "ring" for a few cycles, degrading
    by the effect of the resistance of the primary winding and any energy
    released at the plug. If you put a diode across the winding, you will
    lose a lot of your spark energy.

    Kaybearjr's suggestion is probably best. Dyna (et al) makes a unit
    that does just this. They go for about $50 US and drive a single coil.
    I'm considering one of these for my bike, since I could wire it out
    on the side of the road, should it become necessary.
    Matthew Lundberg, Feb 7, 2004
  12. I do believe that the bike won't run very well at all with the capacitor
    removed, but since it's an easy experiment, by all means give it a shot
    and report back.

    It certainly would be instructive to hook the o-scope up to the primary
    winding. I have a cheap scope here that might eventually end up in the
    garage for just such purposes.
    Matthew Lundberg, Feb 8, 2004
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