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If it's hot out side you don't need the choke. And you don't have to pull the water pump to check it. just take the cap off the radiatior (while cool) Then start the bike and slowly work up the RPM's if the water's moveing the pump is fine.
In case you don't know radiatior fluid Isn't just for cooling it's also a lubricant that needs to be changed just like any other. The film you saw was problably the antifreeze brakeing down. It's probalaby time to flush it and refill
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