BAFFLED

What is the soft baffle material, should I reuse it, what could I replace it with, or should I just give it the arse?

 

I wouldn't reuse it. I think it is some kind of asbestos based insulation. You should be able to get some at your local bike shop. I think places that specialize in dirt bikes have a greater tendency to keep it in stock. I don't know if dirt bikers have a tendency or need to rebaffle every once in a while, but that always seems to be where I see the stuff.

 

It's not asbestos, it's fibreglass. Most bike shops can supply it. Just wrap the core and bind the stuff on with soft wire. Try to get it about as tight as the original was, which is usually "not very".

 

And dont breathe in all those loose broken fibres, `sposed to be as bad for you as asbestos.

 

If you wrap it tighter will it be quieter?
I like the exhaust sound on mine but would like to alter the volume.
Looking good as always Wiz.

 

It's a bit of a balancing act. Pack in too much and you get a very quiet bike, but excessive back pressure. In my experience, sometimes a loose pack seems to absorb sound better. Fortunately it's a cheap and easy job, so you can experiment to your heart's content.

 

I packed my Mac style muffler, that isn't even supposed to be packed,
with a layer of fine expanded metal and fiberglass mat, all rolled up.
Made it very quiet.
Since your muffler is a straight-thru design, you won't increase back pressure. Mine was a bypass design, and I was careful to leave some room. Ultralight aircraft guys pack home-made mufflers with fiberglass cloth.

 

That's interesting, TimetoRide. I've never used the mat, as I thought it would rather defeat the purpose of diffusing the gas (and the noise). It would certainly be easier to work with! Did you use fine or coarse weave cloth?

 

I used mat that's used in the boat repair business, but it can be found with the auto body repair stuff (Bondo brand).
The expanded metal is the same as used in drywall repair.
The cloth would be alot less messy to work with, I would think a coarser weave on that, Fiberglass cloth used for surfboards would be too fine??

http://www.piteraq.dk/flight/muffler.html

Some muffler tech ^ ^

 

Thank you. That was a very interesting article.

 

Many of your suppliers (Dennis Kirk, Chaparral, etc) carry generic muffler repacking kits for this pupose. Two things; 1) wear a dust mask, and 2) wear latex gloves.

 

the stainless steel pot scrubbers work well to pack a muffler and they last forever

 

This seems a nice clean solution, how did it effect the noise level / performance.
BTW did you get my PM Mr P?

 

performance, i feel no change by seat of the pants tests but it takes the higher pitch annoying part of the sound away so it may seem faster because you can stay on it more
i used 6 of them on a MAC silencer and it made a difference but i could have easily jammed 10 in there but 6 is all i had
(0) steel wool works but doesn't last

 

Well that worked out OK, thanks Polock.