Hello, I'm wondering if anyone could suggest a good allaround carb for these engines. I have tried 5 different style carbs "stock included" on this thing and keep coming up with the same problem which is= at wot or accelerating engine cuts out as if starving for fuel. Or will 4-stroke or both. These engines seem to have very poor manifold vaccum to pull fuel. Right now I have a 50cc hp walbro style carb on it which seems to be about the best running of the bunch. By the way I have soldered and drilled jets till I am blue in the face, just can't find that happy medium, its too rich or too lean. I have the catylitic muffler because I want it to be as quiet as possible. Im wondering if it is posing a back-pressure problem. I have also been through the ignition throughly. Well guys and gals any ideas would help as I am about out of answers. Out of time for tonight but will be back tomorrow. Thanks all..