NotTaR of small Gasoline Engines and Rotary Lawn Mowers : Lawn mower too loud                     
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Lawn mower too loud

Small engines - especially those on cheaper mowers - are usually loud, no question about it. However, if yours sounds like it is about to explode or take off, there may be something actually wrong.

Obviously, if it is backfiring every other stroke, you have a problem with the ignition timing, mixture, valves, etc. What this section deals with is just the normal noise assuming the engine runs properly - and how to reduce it. Else, you need to perform the proper maintenance first.

Note that for a 2 stroke engine, the muffler is particularly critical for proper operation and substitution may be more difficult.