Point taken about the sealant. It was non hardening so I gave it a go and it appears to have sealed ok.
I adjusted the valves which was a fairly simple process. The pull rope now extends out much smoother.
The governor arm appeared to be set correctly after following your instructions. I am confident this will not require any further adjustment.
I will invest in the tacho. I think it is a more than worthwhile investment.
On a separate note, I was thinking the over-reving might be too do with the way I installed the throttle however when the throttle arm is in the choke position the butterfly is closed (exactly how it should be) and when you move the throttle arm up say a � it goes off choke. Could I have missed something in this area which is contributing to the over �reving?
I also noted earlier that multiple holes for the governor spring were not included on my model so I was unable to make the adjustment you mentioned.
Tonight I will give it a run and see how it goes, until then I�ll await your comments.