Hayabusa thermostat going up after bike is off

ric_rocha5 · 16 Aug 2016 at 16:41

Hello,

I am a owner of a 99 Hayabusa and I started to notice that the thermostat is going up after bike is off.

Once I turn it off and put it on the side stand the pointer goes all the way up, I have looked in the manual and online but i have found nothing about this. :eek:

if you guys can help that would be amazing !

Many Thanks

ric_rocha5 · 16 Aug 2016 at 16:47

tom_e said:
It wouldn't surprise me if the temp does raise slightly when you first stop as the fan will no longer be running and you've got no air flow to cool a still hot engine.

I wouldn't worry about it to be honest as long as your fan is still coming on when you'd expect it to when riding.

Thanks for the reply, I'm sure that is not overheating, as it also happens when i just turn the bike on in the morning.

ric_rocha5 · 17 Aug 2016 at 10:52

cyclops12 said:
Think it's something to do with the ignition, i'm willing to bet if he turns the ignition back on
without starting the bike the needle will start coming down slowly.

Hey there .one. how's it going bud? I'm now a very young grandfather... A lad and the next gen of bikers lol.

Already told the daughter that I'm getting him a bike as soon as he's old enough just like I did

She's fine with it as she's always loved going on the bikes, not sure if her mother will agree though☺

He's already got a Hayabusa and Rossi onesie

Lol I told my girl that if we have a kid I will get one of those mini petrol bike for him.

He will be like this https://www.youtube.com/watch?v=5UBPM07RFHc . LOOL

ric_rocha5 · 17 Aug 2016 at 11:20

Dogbreath said:
The rapid rise in temperature after an engine has been switched off (and therefore stopped generating any heat) is an effect known as heatsoak. All engines suffer from this to some extent unless they have an electric coolant pump that continues to run after the engine is stopped.

Unfortunately the word 'heatsoak' is widely misused by people when they actually mean something just gets hot (e.g. intercooler etc).

The surprising thing is that the gauge is continuing to register temperature with the ignition off, since the vast majority of temperature gauges are electrically operated this shouldn't normally happen.

Just a thought, you aren't using the kill switch to stop the engine are you? On some bikes (and I think this may include the early Busa) this will cause the temperature to read maximum with the ignition on.

Hello,

I have made a video to show what is happening.

https://youtu.be/eZ17eLa5-eM

Thanks for the help

ric_rocha5 · 17 Aug 2016 at 11:39

MowyTone said:
Does this happen if you turn the ignition on with the engine cold...leave it for 30 secs and then turn it off again?

Could it be that the resting position of the gauge is on that side (for whatever reason)?

Hello,

Yes it does, I dont think is the resting position, because if I put the side stand but do not lean the bike it happens also.

ric_rocha5 · 17 Aug 2016 at 11:48

Rossi~ said:
Certainly looks like a strange sensor/electrical connection issue.

Have you had any work done recently? Work that would have meant disconnecting or moving electrics/loom.

I have changed the battery only.

ric_rocha5 · 17 Aug 2016 at 13:15

Rossi~ said:
Reason i ask is that it looks as though there is some sort of connection mix up between the thermostat and the stand switch.

I will check if the cable is pugged in properly.

ric_rocha5 · 18 Aug 2016 at 13:49

Dogbreath said:
Does the same thing happen if you switch the ignition on with the kill switch set to "off" and the sidestand up?

Once off the side stand it goes down to normal.