dickie wrote:What about aiming for 125 special port timings and 20mm carb?
I'd imagine there are plenty of 125 special barrels available to buy for not much and just bolt on.
Martin, if he is planning on spending time on dual carriageways, the 125 Special/ GP125 engine will be found out very quickly. But, if he lives in a town or city, that engine with a standard exhaust is quite nippy. I ran one for a few months several years back.