Something some of you may not be aware of if you have a radiator gaurd on your bike
If they are fitted close to the radiator they get all sorts of crap caught between the gaurd and radiator. If you get small stones in there they can rub and chafe causing holes to form and then the inevitable. Too much crap between the two can cause overheating. Found this out when my mechanic was checking my bike for overheating
Easy fix just pack the gaurd out so the crap can fall right through
Hope this is helpfull