Want to reduce noise?

robkdx · Post by **robkdx** » 01:35 pm Dec 24 2015

My H gives me a decent headache due to its noise. The airbox lid is removed and it has a full PC2 system.

I think I will refit the airbox lid as it has quite a bark with it off.

But will I lose power re-fitting the stock muffler? And will it be quieter?

Thinking about it when I re-packed my PC muffler I may have used 4 stroke packing, would this add to its noise?

Jim B · Post by **Jim B** » 03:14 pm Dec 24 2015

How about just wearing ear plugs?

robkdx · Post by **robkdx** » 05:59 pm Dec 24 2015

Jim B wrote:How about just wearing ear plugs?

Valid point, and I have to on my big road bike. I will be getting some custom plugs made soon.

diymirage · Post by **diymirage** » 09:39 pm Dec 24 2015

you will NOT find an aftermarket silencer that outperforms the stocker
other then putting a few pounds back on the bike, running the stocker will not result in loss of power

Post by **Julien D** » 12:34 am Dec 25 2015

diymirage wrote:you will NOT find an aftermarket silencer that outperforms the stocker
other then putting a few pounds back on the bike, running the stocker will not result in loss of power

That's pretty accurate. It's big and ugly, but it's quiet and flows well. The noise from the airbox is nothing compared to the exhaust.

Jim B · Post by **Jim B** » 01:27 pm Dec 25 2015

robkdx wrote:Valid point, and I have to on my big road bike. I will be getting some custom plugs made soon.

With all the excitement of riding the bike, I think a lot of people don't realize how loud they are. The cheap-o plugs work fine for me, but everybody's different. My fiancee has to use children's ear plugs; I guess she's got unusually small ear canals.

robkdx · Post by **robkdx** » 02:04 pm Dec 25 2015

Jim B wrote:
robkdx wrote:Valid point, and I have to on my big road bike. I will be getting some custom plugs made soon.
With all the excitement of riding the bike, I think a lot of people don't realize how loud they are. The cheap-o plugs work fine for me, but everybody's different. My fiancee has to use children's ear plugs; I guess she's got unusually small ear canals.

You can get ones that you make at home. I think you heat it up and pour it into your ear and it sets.

Post by **SS109** » 02:31 pm Dec 25 2015

I guess I'm one that just doesn't understand why people think our bikes are loud. I have run factory silencers and aftermarket and there isn't much difference IMO. Yeah, the aftermarket is louder but by maybe a few decibels. It's not like our bikes are 450 4T's with a race silencer!

Tioli · Post by **Tioli** » 05:57 pm Dec 25 2015

I totally understand the sound issue. To many years of listening to high revving two stroke music plus when we were younger cars never has aircon so the window was always down and on it goes

I did not want to use a stock chamber as I naturally thought it's not going to work as well so came up with this solution:
Half way down page 20 from the link
http://www.trials.com.au/forum/viewtopi ... &start=380

The link will take you to where I first use it but you will have to keep scrolling through several pages as it took me a while to work out how to use it properly and then hold it in place. When you get to the metal zip ties is when I got it right.

I still use moulded earplugs but that's just me being overly protective. It sounds about as loud as my mates stock twin walled pipe on his RMX250

Slick_Nick · Post by **Slick_Nick** » 07:29 pm Dec 25 2015

I always wear ear plugs when I ride. I almost feel "naked" without them. Just another piece of riding gear in my books.

I use the disposable foam ear plugs that you can easily find anywhere. I think a 200 pack is like $8 at lowes. They fit inside my helmets easily.

ohgood · Post by **ohgood** » 07:35 pm Dec 25 2015

I've noticed a power lots between the gnarly and the stocker. the stock pipe is so quiet though it's a real treat.

the most noticeable change comes from just putting the air box lid back on.

I still wear ear plugs.

Post by **fuzzy** » 12:21 pm Jan 13 2016

I'm; personally a big fan of the stock exhaust. After owning several KDXs that came with pipes, my current one has all stock exhaust. It makes the most low end of any pipe I've ran. Pipes that wake up the top end make the bike feel faster (probably a 2-3hp gain at peak), and likely do make it a touch faster, but I've found just short shifting the stock pipe makes it a negligible difference. The stock pipe is definitely slower in a drag race type scenario if you wring it all the way out.

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