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Scooters - 125 to 300 => Downtown 300 => Topic started by: Adept on March 01, 2015, 11:07:43 AM

Title: Exhaust muffler srcew help!!!
Post by: Adept on March 01, 2015, 11:07:43 AM: Today accidentaly discover this center screw at the exhaust muffler tube. You see it on the picture.
If I took it out, gas came out, and the muffler sound became like an Akrapovic... :D 8)

What is the function of that little screw? May I take it out? I like this heavier sound... Will it cause any problem in the future?
Title: Re: Exhaust muffler srcew help!!!
Post by: sklnzl on March 01, 2015, 12:42:51 PM: I don't know the role of this screw but if you removed it ,that would be as a leak in the exhaust system.
Title: Re: Exhaust muffler srcew help!!!
Post by: windwheeler on March 01, 2015, 03:36:19 PM: Quote from: Adept on March 01, 2015, 11:07:43 AM
I like this heavier sound... Will it cause any problem in the future?

Stop "noise polluting!"

And besides the above, yes, it could cause a condition that could harm your engine... Not a good idea IMO.
Title: Re: Exhaust muffler srcew help!!!
Post by: zombie on March 01, 2015, 06:15:24 PM: T ake the whole pipe off, and ride up, and down Wheelers block.

2:00 am sounds about right. ;D
Title: Re: Exhaust muffler srcew help!!!
Post by: Adept on March 01, 2015, 06:38:11 PM: Don't kill me!!! :D It is not so bad. It is not louder than a legal Leo Vince or Akrapovic stuff... In Hungary you can use a little more sound for your own protection against the cars...

So any idea about the srcrew? Do you have the same??
Title: Re: Exhaust muffler srcew help!!!
Post by: de dee on March 01, 2015, 07:42:57 PM: the manual says it will cause loss of power,. page 1 sect. 2 ,. a 3 mm. hole in the exhaust pipe, how much could that change anything,.
Title: Re: Exhaust muffler srcew help!!!
Post by: zombie on March 01, 2015, 11:52:02 PM: The carb or fuel injection is metered to a set amount of back pressure. Changing that pressure requires re jetting or re mapping.

Most of us have speculated that hole is there for an "In House" emmisions inspection before the bike leaves the factory.
Title: Re: Exhaust muffler srcew help!!!
Post by: BettinANDlosing on March 02, 2015, 02:01:41 AM: If could be required emission test port for the EPA, idk.
Title: Re: Exhaust muffler srcew help!!!
Post by: kneeslider on March 17, 2015, 01:05:17 AM: That tiny hole isn't to matter much for your AFR with factory mapping. The same mapping is used and scooters are sent all over the world using what ever fuel is available at that destination.

The tolerance just isn't big enough to cause any harm.
Title: Re: Exhaust muffler srcew help!!!
Post by: mrbios on March 21, 2015, 07:51:14 AM: Quote from: kneeslider on March 17, 2015, 01:05:17 AM
The tolerance just isn't big enough to cause any harm.

I agree. I like things quite but It is probably too small to matter. To be save check your spark plug ever so often to make sure it isn't too white "lean burn" and of course 2am is the time to really open the throttle. ;)
Title: Re: Exhaust muffler srcew help!!!
Post by: An Orange Crush on March 26, 2015, 10:42:56 PM: Let me know where I can find the hardware to the left and to the right of that center bolt, mine came off lol.
Title: Re: Exhaust muffler srcew help!!!
Post by: kneeslider on March 27, 2015, 02:37:29 AM: My entire heat shield for held on by those two screw completely fell off. Buying a replacement part doesn't include the screws. But any workshop would have them. They aren't special items.

I suggest using some locktite on them when you fit the new screws.
Title: Re: Exhaust muffler srcew help!!!
Post by: souzamoto on March 27, 2015, 02:43:47 AM: Gas Analyzer port. Needs to be plugged