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yes the muffler being clogged can have a great effect
it is like a car with a potato shoved up the tail pipe
do you still have the old oil
can you smell it?
possible that the girlfriend did not overfill the oil
it is possible that the carburetor has been acting up
the float may have stuck
actually the needle valve may not be mating properly with the seat
and the flow of gas may not have been stopping
and the gas may have drained through the cylinder and into the oil sump mixing with the oil
This gas /oil mix would smoke very badly when it ran
oil gone did not smell overfilled for sure carb a possibilty i have gas in cylender did not smoke
Your already tried section said it smoked badley..?
Gas in the cylinder is a symptom of the carburetor needing cleaned because the float is still stuck a bit
when it was overfilled
Here is an owners manual for your engine
for future reference
check carb over muffler
usually, muffler would make it seem low on power, and it would never really get up to full speed
kind of like as if you were running a marathin in your sleep towing a 100lbs behind you
giving long sanswer next