Some of the small Yamaha scooters have enclosed cooling with coolant sealed into the system.No radiator to check or fill.
I'd guess it's probably that system.
Dinosaur.
"Oh Man I only ride 'em.I don't know what makes 'em work". Donald "Oddball" Sutherland
"Don't let the bastards get you down". Kris Kristofferson
"I am only paranoid because everyone is against me". Larry [Frank Burns] Linville
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