Question about 1989 kawasaki ZXR 750

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No spark at the plugs

I have no spark at the plugs, the fuel pump is not drawing in fuel either even though there is fuel running from the tank, the other problem I have is that two of the spark plugs (outside cyclinders) are just turning in the head and wont come out, should I just burn the bloody thing?
Thanks, Martin

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  • muriel631 Jan 30, 2009

    Hi, and thanks for he help, I was afraid of that, it was an old wreck that I got and am trying to fix up as Im broke and NEED A BIKE! I 'll just have to get at it, thanks bro, regards, Martin



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I find gelignite works better and leaves a more lasting impression.

Martin if two plugs just turn in the head they are stripped.... removal of the head is required and probably replacing it... that's just a start... what happened to the bike anyways ?


Please take a moment to rate my solution... thanks

Posted on Jan 29, 2009

  • Roberta Smith
    Roberta Smith Jan 30, 2009

    I love working on projects like that if they don't become too expensive.... let us know how you make out and i believe i have access to the manual so leave question here if you run into problems.




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Won't fire up

Silvercliff- since you use the word “plug” I am assuming that you have a spark plug type heater, not the new technology HSI type (hot surface ignitor) that uses a glowbar and an onboard computer.

Reddy heaters are simple to troubleshoot, but you must understand how the system operates.

Since you state that the heater produces a fog at startup indicates that you are getting “some” fuel.

Obviously, the fuel is not igniting.

Now, you must determine if there is any spark. Is a good spark arcing across the electrodes on the plug? If not, is spark being produced by the Ignition Control unit (aka spark box, transformer) ? If not, is the Safety control (reset) sending electricity to the Ignition Control unit?

If there is a good strong spark at the plug, then you are having a fuel delivery problem, even though there is “some fuel”. Understand that the amount of fuel being delivered to the nozzle is DIRECTLY related to the air pump pressure. If the air pump pressure is not correct, then the fuel delivery is not correct. Setting the pump pressure is not difficult. Pump pressure is CRITICAL. Instructions for setting the air pump pressure can be found at .

If the air pump pressure is correct, then check the following:
  1. Cracked air line preventing correct pressure at the nozzle.
  2. Cracked nozzle adapter preventing the fuel from being SUCKED from the tank.
  3. Clogged fuel filter.
  4. Restricted or worn nozzle. The fact that your heater is a spark plug type heater indicates that it has some age on it. DESA recommends annual replacement of the nozzle. Are you using the original nozzle? Worn nozzles produce a SPRAY. New nozzles produce a FOG. The nozzle produces a cone shaped fog. If the cone is missing (not hitting) the spark, for some reason, then there will be no ignition.
  5. Finally, and don’t laugh, is your fuel 100% kerosene or diesel? Water sinks to the bottom of the tank. The heater draws fuel from the bottom. If there is an inch of water on the bottom…….., well, water will not ignite.

I hope this helps.

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