Sandy Koocanusa
Serious Thumper
Offline
Don't blame me. I didn't vote for him.
Posts: 1878
Bigfork, MT
Gender:
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Someone had opened mine before I got it, so I am not 100% sure what they look like inside when stock. If you want, you can look back a few weeks for my "This muffler is screwed" thread. There are pictures there.
What I have found on mine is that the back plate is riveted into a ring that is part of the body of the muffler. Attached to the inside of this plate is a mesh cage full of fiberglass, or asbestos, or whatever. It looks a little like a silencer for a pistol. Farther toward the front, maybe a foot or so, is another plate with about a one-inch hole in it.
So, what has been done to mine is this:
1) The rivets in the back were removed and replaced with lag screws. 2) The weld that holds the cage closed was cut and the fiberglass removed. 3) Three, 5/16 holes were drilled in the forward plate using a bit extension. 4) I just yesterday changed to a larger pilot jet.
Now, more or less depending on my mood, I can remove or replace the back plate for a SIGNIFICANT change in the sound. When the plate is in, it is still louder than stock, but not too bad. When it is out, I worry some about upsetting the neighbors, but you should see the deer scatter ahead of me.
That plate fits tightly inside the body of the muffler. I just run a bar or channel lock handle or whatever is at hand inside and use it as a lever to wiggle it and then pop it out like a cork.
This will definitely change the way the bike runs, so be prepared to make changes at the carburetor. I won't know until tonight if I have made the right change or not. Haven't run it much with the new jet in.
Good luck!
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