All of a sudden today my engine started running very rich (I have an air fuel ratio gauge) over 55mph, bogged down and nearly quit, and the front of the air filter is damp and yellow with fuel. What could cause THAT? Stuck needle or float? Blown power valve? Too strong a squirter? Cheap fuel pump over pumping? Choke? It’s a new 650 brawler carb. Only happens during off idle cruise over 55mph. Also went from good afr .95 lambda down to .8 and less under off idle cruise for no reason. Engine Cut off when it dropped down to .7 afr. The car has been great for 2 weeks, then out of the blue, it bogged and barely idled to a stop and ran consistently rich. Sat 1 minute then drove off and it happened again several times over 55. Did fine at idle and under 55. Thoughts? This was the first 85 degree day since engine was built. I tuned the carb with temps less than 70 and also with a 160 degree thermostat. Should I put the 180 degree in it, let it get hot and re-tune it (primary jets) for summer temps? Engine runs at 160 typically, went to 195 today in traffic but came down quickly underway.