ITS GONE!
Not quite sure what it was though! All I did was unsrew the motor and had a look inside at the bearing, but there wasnt anything to see so I tightened it all together again reset the mesh and hey presto it sound ok!
Maybe it was somthing to do with the mesh? would it sound rough if it was to tight?
I also noticed that I hadnt tightened the grub screw on the pinion onto the flat side of the motor shaft! could it have been this?
Anyway...thats for the help!
Craig.