Well I have A 13.5 mm carb and I'm running A 18-6 prop I rework the throttle linkage and now I'm getting full throttle but haven't had the chance to try it out again its raining to day.
Some where on here was A really good thread on carb adjustment but I couldn't find it. maybe it needs to be readjusted?I will go back and read those pages again.
Thanks guys I will post some pictures of the engine.also the vent for the diagram was pointing toward the prop and I had not soldered a tube in it yet and run it to the fuse I have since finished that task.