I just decarbonized this 1980 muffler and mounted it to my 1980 Honda Express and got a top spreed of 30 MPH.
I put it in my outside wood furnace for 1 hr buried in the coals and then pulled it out let it cool. The results were very good as the muffler was restricted prior and top speed was much less than 30.
Wire brush and add a fresh coat of paint to finish the project.
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