Question about 2000 kawasaki ZX-12R

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Zx12r overheating the bike is overheating, into the red within 5km of distance, changed the oil and the coolant and still same problem

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  • knight_jaco Jun 18, 2009

    hi tom, i checked the coolant seems to be circulating when i take off radiator cap and start her up, also i took out the thermostat and put it in hot water, and it is opening up, (what could happen if i take out the thermostat?) i flushed the coolant aswell to check for restrictions, how do you bleed the coolant system on it? the fan kicks in at quite a high temp, can a person adjust it? someone told me to put in a switch to permanently power on the fan, would this work?



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Four choices in order of probability >

  1. The thermostat could be bad
  2. A cooling fan not kicking in
  3. A bad water pump
  4. A restriction in a coolant line or radiator
Go to the site below where you can see a parts diagram for your specific bike. You will select the actual brand, year, model, etc., once you go to the site. Part numbers and prices are also shown. You can order parts from this site. In the event no price is shown on a particular part, the part is not in stock.

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Posted on Jun 15, 2009

  • tombones Jun 18, 2009

    If the thermostat were left out it would take longer for any overheating to come about. No actual harm to the engine would happen. The idea behind a thermostat is to keep the motor running at an optimum temperature for best performance. The switch controlling the fan is on the left back side of the radiator. Only one thermoswitch is available ($70). The current switch could be bad and coming on too late. Remove it and clean any buildup on the sensor end. The switch is not adjustable. Hooking up a switch for the fan is not going to hurt anything but the bike was designed to cool properly without it. There is no bleeding of the system.

    Have you considered pressure checking the system? It operates under pressure. A pressure leak at the radiator cap would cause an overheat problem. Is the coolant 50-50 antifreeze and water? Yeah, I forgot to mention a couple of things in my list of possible sources. That's what I get for growing old.

    By the way, I have found a free factory service manual for your bike. Go to this site and you can download a free PDF of the service manual. It is a 112gb file so it will take about 5-8 minutes to download. It goes into detail on checking components and servicing them. Guess you won't need me anymore. Hey, that's okay! Now I can go help the next guy. Could you take a moment and consider if I have been very helpful on your problem? Now rate my answer.

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What can ido to fix the rough idiling

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