How to quiet down a CR500?

Just don't get it off idle.

5thgear said:

Just don't get it off idle.

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Let me re-phrase that: any non-sarcastic advice is appreciated!:devillook

Good advice...

The best advice I can give you, after owning the same bike for a long long time is to change the packing on your canister very very frequently and another thing is one single pack of the stuff isn't good enough, you need to buy two (FMF or Moose). You need to pack it as tight as possible so that you can barely slip it back into the can itself. Not only will that quiet the bike down substantialy but it will also improve your bottom/mid response as well, obviously a cr500 allready has tons but you will notice a vast improvement. Hope this helps you.

Not sure if my post is worth 0.02 cents but...rather too much useless info than none at all


FMF has a "Q" silencer for CR500 models 1991-2000

http://www.fmfracing.com/products/catalog.aspx?CategoryID=63

It advertises bringing it down to 96db.
Not sure if that is the Quite you are looking for.
$159 US so maybe try FastbyFerreira's method first

What Ferrira said. But most the noise is from the expansion chamber. Wrapping it in Heat shrink works good. The trick is too wet it down before you wrapp it it helps with the curves.

Also build a down turn spout for the end of the muffler. The guys in the dunes use all those tricks if not it's a $110 fine and they check all the time.

Stumbled across these strange looking contraptions: http://www.thedbsnorkel.com/
Sounds like they might work. Ugly as sin though.

racer62 said:

Stumbled across these strange looking contraptions: http://www.thedbsnorkel.com/
Sounds like they might work. Ugly as sin though.

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Graeme Buck used one on his 125. Fresh repack seemed to work the best out of all the tricks

Repacking the silencer is key however it also is important to be sure that all exhaust joints are sealed(especially where the pipe meets the cylinder).A carbon fibre pipe guard may assist as well.

Talk with the guys that raced them out at Mission a couple of years ago--their bikes weren't too loud.

umm....dont start it.

GSP said:

Talk with the guys that raced them out at Mission a couple of years ago--their bikes weren't too loud.

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Those are not quite a CR 500 , but Jumby and Ludwig use to run one don't know if it was before last years sound requirements.

The db snorkel is interesting. The company sent us a free system last year to try on the 125 bikes. Graham Buck was working with it and it seemed to shave a few db. Might be worth getting a hold of Graham and asking him about it as he's spent time with it on a dyno with a sound meter. Otherwise, long silencer with good packing. Paul would probably know what sort of readings he was getting a few years ago.