Sounds like a carb issue to me, as well. But before getting into that, try running at low speed until it's warmed up, then crank in the throttle. If it lags, try squeezing the tank line bulb. If the revs pick up, slow down, pause, repeat. If it works 3-4 times, suspect is the fuel pump diaphragm
line from hose connection to carb).
If the bulb makes no difference, problem could be either junk in fuel
bowl or a sticky bowl float. First pull drain plug
from bowl and drain fuel into a catch. Shallow white plastic, like a spray can cap, works well. While the drain is open, you can try spraying carb cleaner up through drain hole, give it a good long squirt to hopefully flush loose crap out. Reinstall plug
, connect hose, squeeze bulb to refill bowl, try running again.
If problem persists, you'll probably have to pull the carb, open it up and check-clean as needed. Check the float level height - the manual should describe how, with a pic of proper level. The float engages the needle valve via a brass finger, and if the finger is at the wrong angle it will close the needle valve with too little fuel in the bowl. At higher revs the jet will suck air until the fuel level rises back up to meet to, resulting in engine
speed slowing, speeding back up, slowing again.
It's a good thing to know how to get this done yourself.
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