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Discussion Starter #1 (Edited)
I recently bought a sv650 naked.
It’s been running up to 230 degree on a cool night.
does anybody know what the main causes would be!?

(FYI oil is full, also there is no knocking, radiator fans are operable)
 

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Make sure the radiator is full.

Be aware, there is a tiny lock screw on the side of the radiator cap which much be removed before the cap can come off.
 

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fan should come on around 223 or so and cool down to 218 or so. if it never comes on, you need to check that it has power and sensor (and can spin).
if the fan does its thing but the bike keeps heating, you need to look at coolant levels, thermostat, water pump, etc.
go through the cooling system section of the service manual (available online)
 
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