Noisy FMF shorty?

[mjskier]

Anybody else with a FMF powercore II shorty find that silencer very noisy?

I have a 99 YZ250 with a Fatty pipe and that silencer. This is the second time that somebody comments at the track that my bike is very noisy. It has a very distinct snappy sound (one guy described it as "crisp")

Both times it was suggested to me to look into repacking the silencer. The thing is I had just done that before I got that comment. I suppose I could have messed up the repacking, but frankly it seems that it is so simple that it would hard to do it wrong...

Thanks,

Bruno.

[aedwards07]

What muffler packing did you use?Also if you pack your muffler too tight it will actually be louder.

[mjskier]

What muffler packing did you use?

The first time (4 months ago) I used white FMF packing material.

This time I used a black material I got at the Honda store. It didn't seem to make any difference.

I don't think I got it too tight as it wasn't very hard to put things back together. It is possible though. I cut things to length but with the Honda material I put all of it in.

The FMF packing was a bit longer and I had to cut some of it off so that the wrap wouldn't be too thick. That's why I thought maybe I didn't put enough in and since I was going to a 4 day MX class on private property I was going to be a good citizen and repack...

Bruno.

[kx_rider53]

I have a shorty, it is noisy but not that much noiser than others. I do change the packing every 10 hours.

[redrider91]

The shorter the pipe the fast and louder the air gets out and i herd that makes them louder!!!!

[kyleyz]

ive got a shorty...but i still cant hear my bike when im around a 4stroke so i dont care...notice how FMX bikes are really loud?

[Motocross26]

The shorter the pipe the fast and louder the air gets out and i herd that makes them louder!!!!

It's because there's less material in the pipe to dampen the noise.

[Motocross26]

The shorter the pipe the fast and louder the air gets out and i herd that makes them louder!!!!

Shorty pipes are loud because there's less material in the pipe to dampen the noise.