I agree that something in the main jet circuit is clogged. If you're having to run it half-choked, it's got to be fuel starved. Unfortunately, the warranty is only for 90 days. I've had a similar thing happen to my pressure washer and was able to yank the carb off, semi disassemble it and get it going again without a gasket kit. I did have to make a new float bowl gasket, but I have some gasket material and an xacto knife.