hi there, i just bought my brand new O.S. .18 CV-RX motor a few weeks ago. I did a proper heat cycle method break-in and tuned it and it ran amazing. it idled perfectly and it had tons of power. untill today when i tryed to start it, and everytime after it started it kept stalling. I DID NOT change any of the tunning settings nor the idle speed. The engine also seemed like as if it sounded alot more high piched. every single time i let go of the throttle the slightest it would just stall. i tryed turning the low speed 1/2 a turn to the left (rich). That didnt help at all. I also checked the glow plug and it seems to be burning nice and bright. The engine has only been through less than 1/2 a gallon including break-in and i have ALWAYS used after run oil, and cleaned the air filter everytime. So i highly doubt that the engine is damaged in any way. Thanks for your help in advance.

You have to reset the engine for each day's conditions. The settings change as the weather changes, so you have to reset them. That's normal for any kind of engine that uses alcohol as a fuel. Today's settings may likely be no good tomorrow...or the next day you run the engine.