Nice looking quad. The gold knob that your referring to is actually a R and D Flex jet, dont let the name fool you, your assumption is correct that's the air fuel screw. Makes life a lot easier I think. It shouldnt be leaking from the wire your talking about that just holds it in place. Maybe make sure the float bowl screws are tight.
Not really anyway to tell what's been done internally without taking it apart.
As far as radiator I'm not sure maybe someone else will chime in with an answer for that. Kinda curious myself. I personally would still want a fan on mine though. Wouldn't run it too much until you get a definite answer.
Last edited by Brandon79; 05-08-2019 at 10:33 PM.