Nope not flooding on start up. It was actually spewing gas out that hose that goes from the air box all the way up by the gas tank and then comes back to just below the air box while riding. I replaced the spring in the diaphram part of the carb, made sure the carb was cleaned good and all settings were per the service manual. We have 6000 miles on this machine and it has never been a problem up until now. If the float height is messed up would that allow gas to back flow into the air chamber????