I have one of these that sat for years. I removed the carb and took it to a guy but finally gave up on him ever completing the work so I bought a new one, hooked it up and boom, it ran perfect. After very little use, I loaded it up, took it to the lake filled it with gas and have had trouble ever since. Essentially what it is doing is starting right up but when I try to give it any throttle it seems to bog down and not increase revs. I have a new sparkplug in it. The carb I have has had pretty good reviews online and it ran so well out of the box. Any suggestions what I might look at?