Kawasaki Sportsbike Riders Club - Australia - Online Forum

Hi folks,not sure if this should be in the tech talk forum,but seem to be having probs with my z 750.temp gauge read 104 degrees yesterday in slow moving traffic and seems to stay around high 80s on open roads.there was no sign of the fan coming on,from what I could hear anyway,would the termostat be buggered?no warning lights came on and the water pipes were nt that hot to touch when I pulled over. its prob a fault somewhere with the fan?all wires seem to be in place too.cheers

quick reply
Lift the seat and check the fan fuse as a start.
others will be along shortly to add sage type wisdom, or give you a bum steer.

Possibly a dodgy fan switch........easy to test, just short the connections at the fan sensor .......paperclips are good for this

thats pretty normal.. my zx6 runs bout the same temp, and you cant hear the fan when it comes on its pretty silent

Mine runs at about the same temperatures.

You'll know when the fan kicks in because your shins will get the hot air blast.

If you see it hit 106, then start to worry.

my 1000 runs at the same temps...

my fan kicks in at 100deg...

its not so noisy.. but it does work...

cheers for the info guys,good to know it seems to be normal,but still a bit of a worry that it gets so hot before the fan works

greaser07 wrote:cheers for the info guys,good to know it seems to be normal,but still a bit of a worry that it gets so hot before the fan works

mmm thats normal

mine is the same too

The CBR929 I had would reach 106 before the fan cut in and open road riding near the speed limit was constant at 82. 104 isn't hot, it just seems like it because water boils at 100 and thats as far as our minds let us think. Its a sealed system in a motor vehicle and steam has the same cooling qualities as water in a transfer/loss situation.

ER-6 - fan relay cuts in between 93-103 degrees C - cuts out at 91 degrees C

My 06 Z750 yesterday actually went to 119 degrees just idling. All the pipes seem fine but as mentioned before very hot to touch way before it gets to the 90 degrees. I've been getting it ready to be re-registered and it's sat idle a bit over 12 months. Was a good boy and removed the battery so that didn't cause any issues. But looking through the advice it says to short the fan connector with a paper clip. By that do you mean stick the paper clip in both sides negative and positive and if the fan isn't running it will start? I'm not much of an auto electrician if you hadn't noticed!

Flywheels MC wrote:The CBR929 I had would reach 106 before the fan cut in and open road riding near the speed limit was constant at 82. 104 isn't hot, it just seems like it because water boils at 100 and thats as far as our minds let us think. Its a sealed system in a motor vehicle and steam has the same cooling qualities as water in a transfer/loss situation.

Wow! give yourself a gold star.
Anyway the water or coolant does not boil as the pressure cap increases the boiling point somewhat higher than the 100 degrees C that the water would boil at. Plus the coolant has a higher boiling point than water. If the coolant/water mixture were to boil the increased pressure would cause the pressure cap to release the excess pressure and you would loose all your coolant. Steam has little if no cooling qualities in a motor as the heat transfer to a gas, (steam) would be negligable. I need a drink, maybe two or six, perhaps 13.
Apparently thermodynamics is not Flywheels strong point.

oldman wrote:

Flywheels MC wrote:The CBR929 I had would reach 106 before the fan cut in and open road riding near the speed limit was constant at 82. 104 isn't hot, it just seems like it because water boils at 100 and thats as far as our minds let us think. Its a sealed system in a motor vehicle and steam has the same cooling qualities as water in a transfer/loss situation.

Wow! give yourself a gold star.
Anyway the water or coolant does not boil as the pressure cap increases the boiling point somewhat higher than the 100 degrees C that the water would boil at. Plus the coolant has a higher boiling point than water. If the coolant/water mixture were to boil the increased pressure would cause the pressure cap to release the excess pressure and you would loose all your coolant. Steam has little if no cooling qualities in a motor as the heat transfer to a gas, (steam) would be negligable. I need a drink, maybe two or six, perhaps 13.
Apparently thermodynamics is not Flywheels strong point.

I think you misread... Water boils at 100 degress C so people naturally assume that if they see the temp reach over 100 indicated that the bike is running hot when in fact its fine. IE its a perception thing for the ill informed

Griffo wrote:My 06 Z750 yesterday actually went to 119 degrees just idling. All the pipes seem fine but as mentioned before very hot to touch way before it gets to the 90 degrees. I've been getting it ready to be re-registered and it's sat idle a bit over 12 months. Was a good boy and removed the battery so that didn't cause any issues. But looking through the advice it says to short the fan connector with a paper clip. By that do you mean stick the paper clip in both sides negative and positive and if the fan isn't running it will start? I'm not much of an auto electrician if you hadn't noticed!

Sorry not much help but the bump will hopefully find you a solution soon