Temperature stuck thermostat modified

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Tez123
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Temperature stuck thermostat modified

Post by Tez123 » Mon Jun 01, 2020 6:26 pm

Hi my temperature gauge seems to be reading roughly 20 degrees constantly. My Zxr was converted to a race bike with ram air and the oil cooler radiator removed. I'm not too sure what they have done to the stat. I have tried to add a picture or two but it is saying file size too large, the picture is only just over 2mb, what is the easiest way for me to attach a photograph?

Thank You

Terence

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banner001
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Re: Temperature stuck thermostat modified

Post by banner001 » Mon Jun 01, 2020 6:51 pm

I use Flickr, post my pics on there and then upload to here.

See if that works, if not I will send you my email and I will upload them for you
UK ZXR400 L3 (1993) - Fully restored and on the roads, my green beast!
JPN ZXR250 A2 (1990) - Revs to 19,200rpm... 'nuff said :smt003

Tez123
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Re: Temperature stuck thermostat modified

Post by Tez123 » Mon Jun 01, 2020 7:54 pm

I've managed to find a website that can compress the file size so hopefully it has worked.
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Re: Temperature stuck thermostat modified

Post by Tez123 » Mon Jun 01, 2020 7:58 pm

Here's the others if they help.

Thank You
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Re: Temperature stuck thermostat modified

Post by banner001 » Mon Jun 01, 2020 9:36 pm

OK so that's not a standard radiator for the bike, and that looks like a temperature probe, not a thermostat?
UK ZXR400 L3 (1993) - Fully restored and on the roads, my green beast!
JPN ZXR250 A2 (1990) - Revs to 19,200rpm... 'nuff said :smt003

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banner001
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Re: Temperature stuck thermostat modified

Post by banner001 » Mon Jun 01, 2020 9:37 pm

That 2 pin bit on your last photo is a fan switch, so that's what monitors the rad temp and turns on your fan if needed... Which you dont as its been removed.
UK ZXR400 L3 (1993) - Fully restored and on the roads, my green beast!
JPN ZXR250 A2 (1990) - Revs to 19,200rpm... 'nuff said :smt003

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Re: Temperature stuck thermostat modified

Post by banner001 » Mon Jun 01, 2020 9:38 pm

The thermostat is located underneath the carbs
UK ZXR400 L3 (1993) - Fully restored and on the roads, my green beast!
JPN ZXR250 A2 (1990) - Revs to 19,200rpm... 'nuff said :smt003

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Re: Temperature stuck thermostat modified

Post by Ewetea » Wed Jun 03, 2020 9:02 am

That is fascinating! It looks like a temperature probe connected to the bottom right hand side of the radiator, but the amount of Araldite holding it in place is impressive. I assume that is a wire at the end of the assembly, so it would be interesting to know where it goes. I wouldn't be surprised if there was no thermostat fitted, hence the reason for a static reading of the temperature. I assume that there is no fan fitted on the basis that the bike will be started and warmed up just before a race, and then switched off at the conclusion. In between the air flow will cool the radiator. Please keep us informed!

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Re: Temperature stuck thermostat modified

Post by Tez123 » Thu Jun 04, 2020 2:32 pm

Thanks guys that's interesting to find out it's a different radiator. I had a look under the carbs and I can see a screw in type sensor but it disappears into the loom. Yeh your right it is a wire that goes directly to the temperature gauge which also appears to be a different temperature gauge. This isn't really an issue to the bike running, only the fact that the gauge doesn't appear to be working so I can't monitor the radiator temperature. I've just contacted the manufacturer to see if there's anything that can be cleaned or if it needs a whole new unit. According to the website it is a mechanical gauge.
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Re: Temperature stuck thermostat modified

Post by banner001 » Fri Jun 05, 2020 4:58 am

Is that a hollow tube then that's going from the rad to the temp gauge? Or is it an electrical wire?
UK ZXR400 L3 (1993) - Fully restored and on the roads, my green beast!
JPN ZXR250 A2 (1990) - Revs to 19,200rpm... 'nuff said :smt003

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Re: Temperature stuck thermostat modified

Post by banner001 » Fri Jun 05, 2020 5:07 am

I just checked yeah it's a capillary tube temperature gauge, definitely not standard and definitely worse than an electrical one.

I would say either a blockage of the capillary tube or a dead gauge. I have a zxr400 temperature gauge here that you can have for a tenner, it needs power, ground and a wire to that sensor on the left side of the engine that "dissappearus into the loom" that's under the carbs, that's your temperature probe.

If the gauge I have is not working then your issue is the bikes temperature probe, these are still available from kawasaki
UK ZXR400 L3 (1993) - Fully restored and on the roads, my green beast!
JPN ZXR250 A2 (1990) - Revs to 19,200rpm... 'nuff said :smt003

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