The engine was running fine and did not seem unhappy untill it slowly died out in about 10 seconds. I will go to 25 to 1 and then 32 to 1 after that. I will richen both needle also how rich should I make it. It there any lenth of time I should not let it run longer than say 10-15 minutes? The engine is an rcs 44 twin. I am used to glow engines and run them with the oil slobeing out the exhaust will the same happen with the gas?