I've had pretty good luck with the crockpot and antifreeze method of cleanining, but that carb might be a good idea to make sure it's cleared out. I actually have a used FP without a muffler that I recently cleaned, replaced the screws, seems fine, just haven't run it yet. From what I'm told, that FP is supposedly a good engine. I also have wondered the amount of time and money I'm investint is worth it. For $55, you could have a nice new TT GP42, that I've have had good success with. It's a very close call. Work on it make it work, or just buy a fresh new engine. Do your tests, and make a decision. If it doesn't work out for you, don't waste any time. Get into a new engine. Time is money and certainly the frustation factor should be taken into account. Sometimes it is just best to get into a new motor. Good luck. Tom