cb250g lean engine

Hello people I have the following problem The engine of my cb 250 g runs too thin, the candle picture is snow-white, anything but deer brown. I don’t think that’s enough power, I’ll get off after running on 110. Then rather break off, afraid to saw the engine. I checked the float status, the petrol is almost at the upper edge of the float chamber. The nozzle is original according to the manual. Carburettor is set in very good, clean condition ignition, contacts new. It is a Mititaire machine from France Bj.76 it has run credible 8200 KM. Thanks for your tips Greetings – purer