Thanks Nick
Still not 100% happy with it, I took the end play out of the fly wheel spindle to try and get rid of the wobble, and its made it more air hungry, strange but it seems very sensitive to the fly wheel, for some reason it will turn over ok by hand with the fly wheel off put the fly wheel on and the linkage locks up, I think its taking up the play and changes the angular relationship of the links.
I've just ordered a 7" flywheel casting, I think this will help smooth things out, and look more in proportion.
Pics i've found of Antony Mounts engine all have bigger fly wheels.
Stew