Originally Posted by
vwitte
Ok here’s a photo. Maybe the piece broke off and it’s not a two piece. . . . How would this affect the running now that the other piece is gone. ? Maybe the exhaust will escape better??
This is whet that baffle
should look like. Yours is broken or was cut in two.
The Sportsters don’t need and actually run better without muffler pressure (many of mine run faster peak RPM on suction than they do with muffler pressure. The muffler doesn’t rob much power from the Sportster engines because the Sportster is timed so low. This series of engine is often referred to the “Poor Man’s 4-stroke”. But a baseball bat on it and it’ll be happy. Put a toothpick on it and you’ll be sad (and it won’t be happy either). The baffle being removed does improve peak rpm a little bit, but it also gets louder too. It’s a quiet muffler with the baffle in place. The baffle delete is good for maybe 300-400rpm and probably a third more noise. Still not offensive though.
I turn APC 13x6s on my .65s, 12x6 on the .45, and 10x6 on the .20/.28 with glow plugs and 5/22 castor fuel. As diesels, the .45 is happy with a 13x6 and the .20-.28 are happy with an 11x6 as diesels. The .45 will turn a 15x7, but not very fast and only as a diesel.
