Thanks for the replies.
NormK, It was doing this before I did your carby modifications so I don't think there is a problem there, in fact throttle control is very smooth through the range now, I just can't let go of the handle as it will slowly pull itself open and really rev the guts out of it.
The little spring is underneath the diaphragm.
I have changed the primer cap as well to no avail although that was a necessity as the plastic around the bulb was failing.
Tyler, thanks for the info some of which I have already done. Maybe I need to to do the rest of the o'rings I haven't done.
Cheers
