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Having found that out I realised that I didn't know what the OE switch should turn the fan on at! Anybody know? :smilebig:
Haynes says "fan on at 98-102 fan off at 93-97 'C

The nerd in me want to inquire how you tested the unit inside an oven?
 

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Would think fan on as fizzy says is correct. If it comes on at 82, your not really going to be running at optimum temp, not ideal for engine as will run too cool all of the time.
 

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Discussion Starter #24 (Edited)
Would think fan on as fizzy says is correct. If it comes on at 82, your not really going to be running at optimum temp, not ideal for engine as will run too cool all of the time.
That's what I'm thinking as well, strangely the Honda WS manual doesn't (as far as I can see) give a temp for the sensor but it does say that the thermostat starts to open at 80-84 C and fully open at 95 C which would tie in with the fan coming on just after the thermostat being fully open.

waynecbrxx1100 said:
HI Duck assuming mine was the original judging by the state of the seal it probably is it has 82.c stamped on it
I'm guessing based on what is in this thread so far that yours has been changed at some time.

fizzy said:
The nerd in me want to inquire how you tested the unit inside an oven?
with great care :smilebig: .…. the oven is big enough to get arms inside without getting burnt so I wired the sensor up and as the temp increased I measured the resistance change and compared it to when the sensor was cold.

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Isn’t there a small resistor in the back of the gauge that may have gone / be going belly up and creating open circuit ?
 

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Discussion Starter #26
Isn’t there a small resistor in the back of the gauge that may have gone / be going belly up and creating open circuit ?
Quite possibly, need to dig out my spares and have a good look!

Anyway, early start time in the garage for me today. Fairings off (again), coolant drained, sensor in the rad changed back to the 100 C one, refilled and run up to mid temp all by 8.45 am! Motor now cooling so I can check the coolant level then up to 'fan on' ..... which I think needs to be a bit later since neighbours might not be keen to hear daily Bird at this time of the day :)
 

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Discussion Starter #27
Well it's all gone pear shaped today!
When I ran the bike up to 'fan on' and switched off the fault on the gauge was still there ....... so out with the gauges (temp and petrol) as a unit and swapped for my 'spares'.
On this set the fuel gauge instantly hits the 12.00 stop! Out with the gauges and 'finger test' and low and behold rather than falling the needle continues to 12.00 :hmm:
https://youtu.be/p6xPAuqLFHE

and just for the record here is the temp gauge misbehaving!
https://youtu.be/Nkf2Lhmk6pc

Yes both are out of focus but I didn't have a spare hand to sort that! Oh yes, I was listening to the News :smilebig:
 
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