Thanks Tabetha,
why is this engine specification such a mystery, I understand about not releasing the mains etc, but there are occasions when new rings can be a cure.
Haines dont specify valve stem diameters either.
A good low mileage secondhand motor would be ideal, but that represents a risk too.
On a slightly different note, can I fit a blacktop lump in,and what do I need to make it fit.
Thanks again
Focusbob2