Try adjusting the valves, seems to be a somewhat common problem on ohv engines. I've heard that if you have corrosion in your carb it's junk (need to get new one) and that you should always use carby rebuild kits. I've cleaned out the carb on my Honda gxv390 best I can, and have put it back together without rebuild kit. Ran the engine like this, but not for that long. About to stick it in my Victa quite soon and then we will see if the carby clogs back up. If this has not been solved till then, will report back with my results of a super dodgy and not recommended carby rebuild.
