Ped still 4 stroking. Takes off fine, get up to speed around 25-ish, then start. If I let off the gas, classic 4 stroke symptom, it will smooth out. BUT, it doesn't do it at the same spot. Sometimes it will, sometimes it won't. If the jet is too big, wouldn't that be a common occurance all the time? If I back off the throttle until it smooths out, then slowly apply more, it will zip on up to almost 30. Then sometimes it won't do it all. Air filter is clean, fuel filter is clean, carb is clean. What else can it be? New spark plug too.