I have noticed recently that the temp gauge stays at the cold start position for a very long time before it moves up to just above middle of the Guage.
I opened the radiator cap, and topped up with distilled water, but not much was required.
The overflow bottle has had the level dropped to mid way twice since I got it back from the shop (crank replaced).
The dropping level in the overflow has never happened before. I have had this scoot for over two years.
I do live close to the highway and drive at 120km continously for long distances shortly after starting the scoot.
It is also colder at the moment (winter),
so I might be overly concerned for no reason.
Does your xc500 also not warm up quickly..?
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