First I would make sure there isn't any air in the system, even the slightest bubble wreaks havoc. Then you might might try a coolant additive like Water Wetterer or some name like that. I have to assume that your SunL is a Roketa Bali type. The radiators on those is behind the fuel tank. If it's hot where you are it could be an air flow issue and an additive may help.
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2021 Dong Fang Super 200- 1,161 miles
1991 Honda Nighthawk 250- 17,443 miles
2009 CF Moto Fashion- 18,608 miles
1983 Kawasaki 750 Spectre- 47,113 miles
twowheeler.yolasite.com/
That's 30,049 China Scootin miles and Counting.
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