Going back to Stock muffler

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terminatr
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Going back to Stock muffler

Post by terminatr »

Hi. My KDX came with a FMF muffler and a FMF fat pipe. I want to buy a stock muffler from Ebay to quiet the bike down.

(1) Is stock muffler compatible with my FMF fat pipe?

(2) If I install a stock muffler, will I need to rejet the bike?
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scheckaet
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Post by scheckaet »

1 yes
2 no
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Julien D
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Post by Julien D »

Did you try to repack the FMF? It should be relatively quiet. Good for you on keeping it as quiet as possible!
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terminatr
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Post by terminatr »

Yes, I repacked it with FMF material. The bike is relatively quiet compare to MX bikes at the track. But I want to get as much quiet as I can. Trying to go stealth. Neighborhood backwood recon mission. My XR200 is much quieter.
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Post by Julien D »

Stock silencer will probably be a touch quieter. The stock pipe would certainly quiet it down even more, for stealth missions!
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Post by David_L6 »

I'm running an FMF pipe and stock silencer. I like quiet too.
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diymirage
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Post by diymirage »

if you are willing to trade off power for silence you could go with the stock exhaust pipe :butthead:
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scheckaet
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Post by scheckaet »

you're not losing any power when installing the stock muffler :roll: nothing wrong in wanting a quieter bike and virtually no power loss...
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Post by diymirage »

>|<>QBB<
scheckaet wrote:you're not losing any power when installing the stock muffler :roll: nothing wrong in wanting a quieter bike and virtually no power loss...
Wasn't talking about the mufler...I thought we had decided on that already
I was talking about the expansion chamber
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Post by diymirage »

>|<>QBB<
scheckaet wrote:you're not losing any power when installing the stock muffler :roll: nothing wrong in wanting a quieter bike and virtually no power loss...
Wasn't talking about the mufler...I thought we had decided on that already
I was talking about the expansion chamber
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Mr. Wibbens
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Post by Mr. Wibbens »

>|<>QBB<
juliend wrote:Stock silencer will be much quieter. The stock pipe would certainly quiet it down even more, for stealth missions!
fixed
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Julien D
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Post by Julien D »

As you like. I didn't really notice much difference in noise level between the FMF, DG, or stock silencer. The stock double walled expansion chamber soaks up a lot of noise. I'd wager that the stock expansion chamber with either silencer would be quieter than an aftermarket expansion chamber and stock silencer. Be a fun test, anyway.
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Post by Mr. Wibbens »

Carvr's stock pipe is so quiet you can't tell when he is right on your six
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Post by it175 »

At A Boy CARV!!!! :supz: :supz: Wibb's... You, SKI And Cavr NEED cigar's. :prayer: :prayer:

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Post by factoryX »

I almost went back to the stock exhaust as well, but decided to mod a trx250r Q silencer to fit, 94db anyone?
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Post by Mr. Wibbens »

6db louder than my Turbine Core
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Post by factoryX »

right..
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Post by SS109 »

>|<>QBB<
factoryX wrote:right..
We sound test all bikes in the AMRA series and KDX's with stock silencers normally test out at 88 or 89db.
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Post by factoryX »

He stated with that figure with the turbine core, but that's crazy quiet with stock. Need to get my bike tested, but I have never ran into freaking ranger. Its way quieter than the PC S/A that came on it. FMF claim 96DB with the Q silencer, which is their second most quiet silencer, first being the Q stealth..
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