Drilling the muffler end cap?

[motomech]

Common practice w/ motorcycle riders who want to add a little character to their ride.
The way I used to do it is to carefully mark off a circular pattern around the exh. outlet and then centerpunch evenly spaced six spots. Then drill six small holes(3/8th").
Better to start small and enlarge if more sound is desired.
If the airbox isn't changed, airflow though the engine isn't increased that much and installing a larger main jet is not required.
Seems to last longer than clipping baseball cards against the spokes.

[cat0020]

Let us know the results when you get some test rides.

[earlwb]

Ooohhh!!!!, clipping baseball cards against the spokes that brings back memories.
Not a bad idea actually. It doesn't cost anything if the cards aren't yours.

[motomech]

Actually, I prefered ballons, for that deeper, V-twin sound.

[jjag]

hey motomech how much of a change in the sound of the muffler did it make and was it a noticeable difference

[motomech]

Sure it changes, it's just a matter of how big you want to make the holes. That's why I say start small and go progressively bigger till you get where you want to be.

[luciano136]

earlwb said:

Ooohhh!!!!, clipping baseball cards against the spokes that brings back memories.
Not a bad idea actually. It doesn't cost anything if the cards aren't yours.

No kidding! We did it on our bicycles

[cat0020]

So, how did the drilling go? any difference in scooter performance?