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 Strange running noise

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5 posters
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Kismet
Scooter Rider
Scooter Rider



Number of posts : 19
Location : 66333 Völklingen
Points : 795
Registration date : 2022-04-18

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PostSubject: Strange running noise   Strange running noise I_icon_minitimeSat Jun 03, 2023 4:56 pm

When my scooter is cold it makes this weird howl. From about the 11th second it starts. Can anyone tell me what that is? When the scooter warms up after about 3-4 km the noise is gone.

https://www.youtube.com/shorts/8y2PcXJ8lqM
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Terry Smith
Touring Scooter Rider
Touring Scooter Rider
Terry Smith


Number of posts : 393
Age : 59
Location : Auckland, New Zealand
Points : 1947
Registration date : 2020-03-11

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PostSubject: Re: Strange running noise   Strange running noise I_icon_minitimeSat Jun 03, 2023 6:55 pm

Sounds like either the belt or a bearing. In the CVT transmission the belt and pulleys are always spinning with the engine. Given the noise only started after you revved the engine I would say it is a harmonic between the belt and pulley. How old is the belt?
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Kismet
Scooter Rider
Scooter Rider



Number of posts : 19
Location : 66333 Völklingen
Points : 795
Registration date : 2022-04-18

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PostSubject: Re: Strange running noise   Strange running noise I_icon_minitimeSun Jun 04, 2023 8:40 am

Thanks for your answer. I don't think it's coming from the engine either. I was thinking the belt, or the roller bearing that's on the cover. The belt is a JT Belt and was changed 2 years ago and about 3000 km.
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1Wingman1
Maxi-Scooter Rider
Maxi-Scooter Rider



Number of posts : 125
Age : 82
Location : Jacksonville, Florida
Points : 4270
Registration date : 2013-01-19

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PostSubject: Re: Strange running noise   Strange running noise I_icon_minitimeSun Jun 04, 2023 7:16 pm

The tone of the howl seems to change as the speed of the rear wheel changes. If that is true, it could be the cover bearing, an axle bearing, or something in the final reduction unit. Even if you have had no oil leak, a first easy check is final reduction oil level. Of course, oil will not fix a damaged bearing.

The cover bearing is a ball bearing and you can tell a lot about those by turning the inner race with a finger. You should hear no noise and you should feel no roughness at all.
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Loosemarbles
Site Admin
Loosemarbles


Number of posts : 1570
Age : 62
Location : South East England
Points : 4533
Registration date : 2016-10-01

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PostSubject: Re: Strange running noise   Strange running noise I_icon_minitimeFri Jun 09, 2023 8:28 am

I've been wanting to replace that bearing in the rear of the cover. I remembered about a toilet paper method and then came across this video using bread:

https://www.youtube.com/watch?v=7XDbdQv9E2E

It seems to easy to be true.
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JohnyC
Touring Scooter Rider
Touring Scooter Rider
JohnyC


Number of posts : 304
Age : 71
Location : Bristol, UK
Points : 825
Registration date : 2022-12-23

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PostSubject: Re: Strange running noise   Strange running noise I_icon_minitimeFri Jun 09, 2023 2:42 pm

Just my penny's worth.

Stick to a proper puller for the size of bearing your on about Chris, the casings is very thin because of the extruded shape around the bearing. You can probably hire a blind set from a hire shop.
Even a cheap extractor would be better than hammering bread, or putty, or toilet paper.

Hope this helps.

Be safe, be seen!
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Kismet
Scooter Rider
Scooter Rider



Number of posts : 19
Location : 66333 Völklingen
Points : 795
Registration date : 2022-04-18

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PostSubject: Re: Strange running noise   Strange running noise I_icon_minitimeFri Jun 09, 2023 3:15 pm

.....so are you sure it's the camp?
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1Wingman1
Maxi-Scooter Rider
Maxi-Scooter Rider



Number of posts : 125
Age : 82
Location : Jacksonville, Florida
Points : 4270
Registration date : 2013-01-19

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PostSubject: Re: Strange running noise   Strange running noise I_icon_minitimeFri Jun 09, 2023 3:39 pm

Won't the hole through the cover preclude using a bread type method?  I have used that method on other tasks with grease and a wooden dowel when the bearing had a seal on the back side.  I had access to a lathe so I could cut the dowel for a close fit.

When my time comes to replace that cover bearing I will try a heat gun then turn the cover over and tap it on the floor.  Inertia can often be your friend.
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