Gentlemen, the reason your Gators won't run when they're cold is because there is too much air jet in them. EPA will only let motors that conform to guidelines leave the factory. If you look at a new carb on a FE290D motor ( CXs have a FE250D, but the same idea ) you will see it has a 42 air jet in it. Older carbs had 40s and the earlier ones had 38s. To give you an idea of size, a 40 is about the size of the smallest probe in a cutting torch tip cleaning pack. The more air jet,the leaner the mixture. Basically your motor is getting too much air in the air/fuel mixture. As the motor warms,it creates heat and makes the air around it warmer. Warmer air is fatter,so not as much goes in the air jet,and WALLAH the thing runs better and everyone is happy. A smaller air jet will make it run better when it's cold, but when the motor heats up and not as much air gets in the jet, the motor goes to the rich side and EPA doesn't like that. Also, I bet if you ordered an air jet for an old carb you would get a 42 instead of a 38 and you would have to figure why it ran worse. The XUVs have it all figured out with EFI and meter the fuel according to temperature and that's why you only have to start them ONCE. I sure like mine.......

Reply

Quote Reply

Digg It

Del.icio.us