Glad you are now O K.The carbon you removed from the muffler originated from in the engine combustion chamber.and also collects there,and inside the entire exaust pipe.The exaust ports of cylinder can become nearly closed and it forms on piston top.as well.May want to check these areas also.This build up is ususlly over a few thousand miles and not noticed over night.There is no oil change interval,as a four stroke,but 2 cycles have carbon removal requrements.Carbon buildup is common in mopeds with fuel-oil mixtures and ,16 to1 creates more than100 to 1.The 16 to 1; is 16 parts gas to 1 part oil,runs smoky and that is unburned oil and that helps make the carbon buildup.
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