Any one have any ideas how to my cap off my radiator to refill my coolant bike is a beta 250 2006 thanks 

It is normal thread.

If it's gone tight then you could try warming it with a hair dryer first?

Pretty sure the cap on those are marked wrong. It has an arrow going the opposite direction.

Its tricky to get a good purchase on the cap due to its location.

You could try using a screw driver against the ridges in the cap and tapping it gently with a hammer just to free it off.

First I had to take it off my 03, I used a set of '' water pump '' plier to free it off

Guy