Hot day and engine idling with no air flow around it, the rad fan will barely keep the temp under max. This is normal.

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Of course, this is not a car and the cooling system relies heavily on passive airflow through radiator and our tiny fan is too small and weak to keep up. The fan is just there for quick stop and go traffic. So no, you can’t just let it idle indefinitely and expect the fan to cycle and keep temps under control.

That said, I’m not sure it should max out the temp gauge if your cooling system is in good shape. It will get one bar higher than the normal operating temp and should hold there with the fan continuously running. So did the temp gauge fill up to the max or what?

Any info on your bike would help. Is it brand new or does it have a ton of miles on it? In that case when was the last time you had your coolant drained and replaced?
While it was idling did you hear the fan running?


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Of course, this is not a car and the cooling system relies heavily on passive airflow through radiator and our tiny fan is too small and weak to keep up. The fan is just there for quick stop and go traffic. So no, you can’t just let it idle indefinitely and expect the fan to cycle and keep temps under control.

That said, I’m not sure it should max out the temp gauge if your cooling system is in good shape. It will get one bar higher than the normal operating temp and should hold there with the fan continuously running. So did the temp gauge fill up to the max or what?

Any info on your bike would help. Is it brand new or does it have a ton of miles on it? In that case when was the last time you had your coolant drained and replaced?
While it was idling did you hear the fan running?


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The bike is fairly old, 2006 daytona 675. Only has 25k kilometres on it. I'm not sure about the coolant though.. Just contacted the previous owner and he hadn't changed it at all within the 2,5 years (6000km) he had it.
I did hear the fan, so I guess that can't be the issue? And shouldn't the bike get hot when riding too if the coolant wasn't working properly? Oh, and when I do around 30km rides with it, the temp stayed within normal when idling. The bars did max out, full 10.

 

Pockets of air get hotter than coolant. Once cooled down, remove the rad cap and see if you're low.

 

Then gen1 bikes all overheated in traffic. Triumph changed the radiator fan on later models. The new fan comes with a shroud which moves more air through the radiator when stopped in traffic.

The early bikes also had a lot of casting sand (fine white) left over in the coolant passages. I would agree that a thorough flush would be a good idea.

 

Is it possible to order the better fan and install it in mine? Or is it even compatible..

 

I did it to mine, but it was not plug and play. Some of the mounts for the shroud are not present on the Gen1 radiator. If you are crafty it can be done though. You just need the shroud.