I gave it a quick wash with normal car soap crap, then covered it in oven cleaner, best de greaser going!
then cleaned it all off and a wash with fairy liquid.
once id done that i let it dry started the bike up and let it idle for about 5 minutes got it warm then just sprayed it.
I used cheap poundland gloss black spray which is actually pretty good and hasn't been heat damaged yet.
to get the old paint off i just used a brillo pad at first to get most of the flaky bits off then the back edge of a knife, dont use the sharp side youll scratch it, then brillo pad after to get the rest of the small bits off.
Once youre done just use a sponge to paint the fins, dont sand it off.
Done my wheels with the poundland spray aswell!! £1 for 300ml ive used 5 cans doing engine, side panels and both wheels.