I had the same problem with mine, rusty and worn. I removed the front grill, rubbed it down, gave the grills a brush with a soft paint brush to take out any debris, rubbed down the side posts and masked off everthing else. Got a small tin of black enamel spray paint and gave the rad and front grill a coat of spay paint, taking care not to put to much on the grills (just a light spray). Hey presto, like new again. You can also go for the more trendy and expensive oil cooler chromed or satin rad grills.
P.s. while I had the spray in my hands, I had to give the side stand a rub down and spray.. looks good