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Scooters - 125 to 300 => Downtown 300 => Topic started by: tvniklas on June 08, 2026, 07:18:51 PM

Title: Should sitt a screw here?
Post by: tvniklas on June 08, 2026, 07:18:51 PM: I was drivning to work today and noticed louder sound from the exhaust than normal.
Air and Noice is coming from the middle hole in the front heat protection, where there are three stainless screws
What is suppose to be there?
Tried to post a Pic, but I possible from phone
Title: Re: Should sitt a screw here?
Post by: Stig / Major Tom on June 08, 2026, 09:29:45 PM: Quote from: tvniklas on June 08, 2026, 07:18:51 PM
I was drivning to work today and noticed louder sound from the exhaust than normal.
Air and Noice is coming from the middle hole in the front heat protection, where there are three stainless screws
What is suppose to be there?
Tried to post a Pic, but I possible from phone

To be clear - there are three screws - but one is missing?

Stig
Title: Re: Should sitt a screw here?
Post by: tvniklas on June 08, 2026, 09:42:14 PM: Quote from: Stig / Major Tom on June 08, 2026, 09:29:45 PM
To be clear - there are three screws - but one is missing?

Stig

Yes, i think it should be a screw in the middle hole.
I upload ed a Pic here : https://ibb.co/8DtDkTTd
Title: Re: Should sitt a screw here?
Post by: Stig / Major Tom on June 08, 2026, 10:04:48 PM: Quote from: tvniklas on June 08, 2026, 09:42:14 PM
Yes, i think it should be a screw in the middle hole.
I upload ed a Pic here : https://ibb.co/8DtDkTTd
Can you "FEEL" pressure from this hole?
I wonder if that is a place to fasten a testing device?
If you can feel that the exhaust is open here, please see your dealer for the missing screw.

Stig
Title: Re: Should sitt a screw here?
Post by: tvniklas on June 09, 2026, 05:04:17 AM: Quote from: Stig / Major Tom on June 08, 2026, 10:04:48 PM
Can you "FEEL" pressure from this hole?
I wonder if that is a place to fasten a testing device?
If you can feel that the exhaust is open here, please see your dealer for the missing screw.

Stig
Oh yes Stig, i feel pressure and fumes are coming out of there
Title: Re: Should sitt a screw here?
Post by: Ruffus on June 09, 2026, 12:37:03 PM: .This a spot where a technician puts a sensor/ feeler gauge to check your NOX values.

In your case there were a "blind" plug, which you most probably lost.

Then go for an inox imbus/headbolt in that size.

Pls see.pic,
-take RH bolt out (the one which holds heatshield)
- try in the middle to plug this hole
- go to a shop
- buy smtg similar
-put an alu washer or two under this plug
Don't worry, nothing bad happens
Title: Re: Should sitt a screw here?
Post by: tvniklas on June 10, 2026, 06:47:47 AM: Quote from: Ruffus on June 09, 2026, 12:37:03 PM
.This a spot where a technician puts a sensor/ feeler gauge to check your NOX values.

In your case there were a "blind" plug, which you most probably lost.

Then go for an inox imbus/headbolt in that size.

Pls see.pic,
-take RH bolt out (the one which holds heatshield)
- try in the middle to plug this hole
- go to a shop
- buy smtg similar
-put an alu washer or two under this plug
Don't worry, nothing bad happens

Thanks 👍
I went to mechanic guy at work who gave an shorts M6 Bolt wita a Cooper washer, seems to work fine 😊
But now i see that my old bike needs new screws and Rubber around all exhaust system 🙃

https://www.motor-x.com/oem/c17121v-downtown-300i-2011-2016-299cc-4t
Title: Re: Should sitt a screw here?
Post by: Ruffus on June 10, 2026, 10:10:02 AM: Knew it works, good to see, most parts there on your muffler system are generic. Just look around to avoid OEM pharmacy prices.