49cc HS exhaust length too short??

Discussion in '4-Stroke Engines' started by Aaron Brown, Dec 29, 2016.

  1. Steve Best

    Steve Best Active Member

    The largest problem with most of the China exhausts that I see in inconsistent diameter going to the muffler, not the exit from the muffler. Make sure it is a consistent diameter from port to muffler with no restrictions. No good to have 3/4" (19mm) pipe with 5/8"(16mm) restrictions at the flanges. Drill the flanges out to 19mm. I found no worthwhile gain from removing the baffles or endcap on any of the Chinese mufflers I worked with. More noise feels like more power but didn't prove to be.