HAllo I have the 14.1hp strong 125 motor YP125R (Euro3) in my scooter. Since the day before yesterday it does not take any gas. (he “swallows” himself). Under full load it then accelerates again normally. The engine starts 1A (cold start enrichment if possible) the first meters he drives super (probably because of the cold start enrichment) then, after approx. 150 -250 meters begins the “bocking” After approx. 3 minutes drive it runs quite normal as if nothing had been. or gets warm only after approx.5 minutes of full load drive, or at very slow speeds (Thermostat doesn’t close properly?) – occasional ignition oscillations (only noticeable in idle mode -> then it goes off) what was done: – oil change – spark plug changed – piston cylinder changed what did I test: – intake air temperature sensor (-> provides different values at different temperatures: from 2kOhm at 20°C to 22kOhm at -20°C) – throttle valve potentiometer (-> > con 800Ohm to 3,1kOhm continuous) Additional air slide: regulates perfectly Has such an error been known/already occurred? Theories: 1) Thermostat does not seal, control unit leans too early -> jerks in warm running phase 2.) Lambda probe defective -> false values in cold condition –> control unit leans the mixture from 3.) temperature sensor on the therostat defective Does anyone know the resistance values??? I don’t think the control times are wrong. The engine runs top when it’s warm t and consumes exactly as much as it used before the cylinder was replaced. I had a piston eater due to a defective thermostat. Does anyone have an idea?