04-11-2018, 05:27 PM | #1 |
Join Date: Jan 2018
Posts: 361
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Clutch rattle/knock sound by engine
Hello can anyone help me.
I hear a rattle or a slight knocking sound down by my engine, but when i pull in the clutch it stops. On a new 125cc. Thanks |
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04-11-2018, 06:20 PM | #2 |
Join Date: Sep 2014
Posts: 1,913
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Does it stop when you're in gear and moving?
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04-11-2018, 07:29 PM | #3 |
Join Date: Jan 2018
Posts: 361
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Yes. only when the clutch is out in neutral it makes the sound
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04-11-2018, 08:57 PM | #4 |
Join Date: Jun 2011
Posts: 1,335
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That sounds like the shaft bearing behind the clutch. I've had this issue on other bikes. I don't know how big of a deal it is to repair on your bike though.
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04-11-2018, 11:00 PM | #5 | |
Join Date: Jan 2018
Posts: 361
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Quote:
or maybe its a loose nut? Similar to this http://www.miniriders.com/chinese-mi...-problems.html |
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04-12-2018, 01:42 PM | #6 |
Join Date: Jan 2018
Posts: 361
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anyone?
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04-12-2018, 02:07 PM | #7 |
Join Date: Apr 2015
Location: Sudbury ,Ontario
Posts: 855
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Sure you can confirm it ,take it apart and have a look ,there is honestly no way we can tell you what is going on with no audio of your problem .
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04-12-2018, 05:19 PM | #8 |
Join Date: Sep 2014
Posts: 1,913
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A couple things come to mind that will make a knocking sound as you describe but I've only seen it in well used engines. First is wear on the clutch basket where the cork plates contact the basket fingers. Second is worn splines in the clutch assembly where it engages with the transmission input shaft. I've also seen springs disintegrate in the primary drive cush gear which is part of the clutch assembly.
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04-12-2018, 06:43 PM | #9 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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A loose shaft nut that secures the basket can alao cause a rattle like described.
It could also be clutch chatter if the oil level is too low.
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04-12-2018, 09:42 PM | #10 | |
Join Date: Jun 2011
Posts: 1,335
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Quote:
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04-13-2018, 12:59 AM | #11 |
Join Date: Jan 2018
Posts: 361
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Thank you all for your suggestions. I'll try looking tomorrow. After i do a carb swap and airbox delete. after i get it idling right i'll see if the sound it still there. The sound does seem to go aways after the bike is completely warmed up. And i'm not sure what side of motor the sound is coming from. Seem to come and go.
I'm also hearing a sort of buzzing sound up by gas tank near charcoal egr thing. here is a few video for sound only. Maybe it helps. I made them pretty fast without the bike fully warming up. I can make more after i see how carb goes. Engine only has 20miles Last edited by Chinabike; 04-13-2018 at 01:27 PM. |
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04-13-2018, 01:28 PM | #12 |
Join Date: Jan 2018
Posts: 361
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I put up some videos for sound.
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04-13-2018, 06:29 PM | #13 |
Join Date: Jun 2011
Posts: 1,335
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On my lap top, it sounds normal but I am on a laptop with crappy speakers.
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04-16-2018, 08:49 PM | #14 |
Join Date: Feb 2008
Location: kingman az
Posts: 34
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open up the access plates and let the squirrels out!!
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08-28-2019, 05:06 PM | #15 | |
Join Date: Aug 2019
Location: Illinois
Posts: 3
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hope you've got a fix!
Quote:
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