I have a 2003 Magnum 330 that will not take the gas if the air filter is disconnected. Is this normal? It doesn't run well at all until the air box top is back on. Then it still seems to be a little sluggish but will run. I don't plan on running it with the air box off but would like to know if there is a problem lurking before I get back in the woods with it. I looked through and cleaned the carb but it didn't look dirty to start with. Problem I started with turned out to be tank stopped up at the petcock. I guess what I want to know is does this type of carb require the restriction of the air filter and box?