... if you got oil in it,... don't worry about it.... Suzuki designed it to be air-cooled and put the fins it needed to work best...
You really can't do anything much about it anyway...
If it overheats, from too much, stop n' go traffic, it'll let you know by getting all stumbly and then it'll die... That's a signal to let it cool off... Stop and have a soda....
Mine does pretty fine in 100+ Arizona heat...
Checking temps on an air-cooled bike, is just gonna' make you a nervous wreck... you can't add a bigger radiator or use water wetter, or a stronger fan...
... best you're gonna' do is blow on it...

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Mind your lips if you try that one...

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Sorry, if I'm being too sarcastic,... just saying, don't worry... It's a well designed engine.