To Get Some Different Exhaust Notes - Honda CBR250R Forum : Honda CBR 250 Forums
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post #1 of 13 Old 08-06-2017, 03:39 AM Thread Starter
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I just saw a video in youtube. In the video the air filter cap is removed to get a bit more deeper bassy sound. Anyone here tried? Is there any harm in doin that to the engine or performance?

Video link:
https://m.youtube.com/watch?v=ffU97wjE0-I
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post #2 of 13 Old 08-06-2017, 10:54 AM
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What is this "air filter cap" you're talking about? There is no "cap" on the air filter and I fail to see anything in this video that was "removed".
Unfortunately, any idiot can post a video on YouTube and this video is certainly an excellent example.
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post #3 of 13 Old 08-06-2017, 12:55 PM
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Whatever the guy has removed most likely had a reason to be there when the bike was build....

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post #4 of 13 Old 08-06-2017, 02:16 PM
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He is talking about the cap you remove to unclip the filter from its holder. I've actually removed it and gave it a rev and it was glorious, but kept it on cause you know engineers put it like that for a reason.

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post #5 of 13 Old 08-06-2017, 06:46 PM
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Then he should have called it what it is. The air filter "clip" or "lid seal". And yes, it is there for a reason. To keep the air filter element snugly in place so that no debris or particles get under or past it, causing SEVERE DAMAGE to the ENGINE, as you easily deduced, Mufasa.
Seriously, the guy couldn't even put a full sentence together to explain what he did in the comments section after being asked numerous times, but he promises to make ANOTHER video showing in detail how YOU TOO can RUIN your bike's engine (but it will sound so SWEET for a few hundred or thousand miles before the cylinder seizes up beyond repair!!)
This is the real downside to social media. Any bird brain with a phone camera can post a video like this and just because it's on YouTube even dumber people will think it's a great idea and actually try it on their own bikes.
Then a few months later they're on here parting out their bike because they can't afford a new engine and wouldn't have the skills to replace it if they could. Sheeeesh.....
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post #6 of 13 Old 08-08-2017, 02:18 PM
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That "mod" has been around since the beginning.

While removing the lid doesn't really do any damage, it also doesn't do any good. Engineers designed the airbox to be a specific shape and volume, and have a specific resonance for intake waves. Removing the lid allows larger particles such as leaves and water to more easily enter the airbox, potentially creating restrictions or undesirable accumulations within it. Mice already like to crawl up the intake tube; no need to make it easier for them.

The increased noise is only from the grunt of the intake waves being able to escape less muffled, and is therefore ONLY audible to the rider. It in no way changes the exhaust note or any noise for anyone that isn't in the immediate vicinity of or straddling the bike.

Mine stays on. Always.
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post #7 of 13 Old 08-08-2017, 07:17 PM
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Leave it alone!
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post #8 of 13 Old 08-08-2017, 11:14 PM
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why not replace the heavy stock muffler - 7kg [over 15lb]
with a good slip-on of your choice, with a range of
potential sounds and db reducers available..

that way you get a real improvement in power/weight ratio,
with a lighter [better] quality muffler which enhances your bikes
design and lines etc, without compromising intake integrity..

you can always store the stock muffler/cat for later sale, or etc,
thus keeping its value, plus the value of the slip-on [if sold]..

[your motorcycle of course,, just another alternative]
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post #9 of 13 Old 08-09-2017, 06:17 AM
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Quote:
Originally Posted by iamragesh006 View Post
I just saw a video in youtube. In the video the air filter cap is removed to get a bit more deeper bassy sound. Anyone here tried? Is there any harm in doin that to the engine or performance?

Video link:
https://m.youtube.com/watch?v=ffU97wjE0-I
I've had my air filter lid off for 40,000 miles in order to eliminate the slight restriction of the air having to pass through the snorkel. Keep in mind that it takes a few minutes for the 02 sensor to heat up to allow the engine control unit to adapt to the free flow after this change. It is a bit louder.


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Last edited by sendler; 08-09-2017 at 06:31 AM.
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post #10 of 13 Old 08-09-2017, 06:33 AM
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Quote:
Originally Posted by shisoshin View Post
why not replace the heavy stock muffler
But now you are removing the excellent catalyst and increasing exhaust emissions.


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