rs 125 temperature problem

ezio88 · Derestricted Danger Joined: 05 Dec 2014 Karma :

This is my first post so hi and thanks in advance for any help...
My bike has a digital display that usually says cold until it gets to 36 degrees then its displays the temp 37 38 39 ect up to 100.
How ever i recently drained coolant to do a leakdown test and since refilling its saying cold even when its red hot.
Early it went from cold to 50 although meant to start displaying temp at 36 then when it hit 58 it started saying cold again.
Any ideas what i could check ? the temperature sensor wire is connected to sensor

john24ssj · Trackday Trickster Joined: 08 Aug 2014 Karma :

You could try to:
boil a cuppa, remove the sensor, turn the ignition on and submerge your sensor in the hot cup of water Smile

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Bikes: Honda CBR600Fi, Kawasaki ER5

ezio88 · Derestricted Danger Joined: 05 Dec 2014 Karma :

P.addy · Red Rocket Joined: 14 Feb 2008 Karma :

The thermostat opens after the temp says its fairly high, like 50-60ish I can't recall. When it gets that warm and it opens a rush of water gets pumped round which might explain the cooler reading.

ezio88 · Derestricted Danger Joined: 05 Dec 2014 Karma :

P.addy · Red Rocket Joined: 14 Feb 2008 Karma :

Unsure as to why that would happen, I'm not an electrical guy at all so could be anyyyything Laughing

ezio88 · Derestricted Danger Joined: 05 Dec 2014 Karma :

john24ssj · Trackday Trickster Joined: 08 Aug 2014 Karma :

ezio88 · Derestricted Danger Joined: 05 Dec 2014 Karma :

So I assume you don't own a multimeter? you could check the resistance values of the sensor when submerged in hot water that would tell you if the sensor is going bad.[/quote]
Ok so my step dad has all electrical stuff i could pop round and lend his multimetre or even better purchase my own if ill most likely need it again some time but could you tell me how exactly i use it or is it to technical to type up i hope not ive seen a multimetre lots of settings on dial ect...

ezio88 · Derestricted Danger Joined: 05 Dec 2014 Karma :

Dont know what i did wrong in above post sorry didnt show your previous post i a box looks like i wrote it all ?

john24ssj · Trackday Trickster Joined: 08 Aug 2014 Karma :

ezio88 · Derestricted Danger Joined: 05 Dec 2014 Karma :

Ok ill go get one and then have to work out how to use it. Many thx

iooi · Super Spammer Joined: 14 Jan 2007 Karma :

It could also be that you have air locked the system.

Take the rad cap and expansion cap off. start the bike and squeeze the rubber pipes to make sure all the air is out and that the fluid gets warm.
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Just because my bike was A DIVVY, does not mean i am......

lukamon · World Chat Champion Joined: 18 May 2007 Karma :

ezio88 · Derestricted Danger Joined: 05 Dec 2014 Karma :

Im pretty sure theres no air in there the way i fill it is i keep pouring in the coolant with the screw out of the rad once it starts pouring out i put screw in then i do same with the bleed screw by spark plug once its pissing out of there i nip it up and fill to max line.
I did start it up for 2 mins with no coolant in there other day dont know if that could damage the sensor ?
Reason i started it was fitted new 34mm carb flat side racing carb and italjet reed block and was just checking it ran ok