Good info about jet sizes... You found the 0.70mm too rich?

Well I found that by using a bigger jet you get more fuel at full throttle but this only works if you raise the clip to compensate so that it is not too rich at lower revs.

My logic was that my engine was too rich at lower revs on the middle clip setting and too lean at higher revs when the jet size matters more. So by running a bigger jet and raising the clip you reverse this now having more fuel at higher revs and less at lower revs.

I promise the engine is much happier, uses less fuel and the spark plug muffler and combustion chamber are all cleaner.

I am considering running a pilot jet! I will drill a small hole in the carburettor and set a hypodermic needle into some QuickSteel epoxy resin creating a tiny second jet. This should help smooth the transitions in throttle.... Then I will have to drop back in size for the main jet