No, use a small screwdriver. Just stick it in and turn to the right.
The way i do it is take it off. Remove the small screw where the tool (screwdriver) goes in, then remove the two bolts that hold it to the cyclinder.
When replacing, just put the screwdriver in and turn to the right. Now hold screwdriver and bolt it back to the cyclinder, then just let go of the screwdriver. It will turn back to the left by itself.
By taking it off you won`t have to worry about it tighting the chain while you have the cam gear off.
05 250X (kid #1)
05 250X (kid#2)