Vibration at certain RPM

[770]

Honda CBR 125R FI

At precisely 6500 RPM it starts to vibrate a lot more. I notice it even more when engine breaking. And when the RPM needle hits 6500 RPM it acts a little weird. Any ideas??

[bodger]

Vibration at a certain revs usually indicates carbs out of sinc, but also occurring on the the overun would seem to discount this.
Could possibly be something loose.
Try checking engine bolts etc. for tightness.
Sorry .just noticed its a single But still could be something loose as above

[770]

[djrikki]

This?

https://www.bikechatforums.com/viewtopic.php?t=291593&highlight=
____________________
CBF125 (Rusty Bin) -> CBR125R (WeeBR) -> Yamaha XJ6 Diversion F -> Suzuki GSXR750 L1 -> Suzuki GSXR750 L1 (Mark2)
CBT: 01/11/13 - Theory : 01/05/14 - Mod 1 : 11/05/14 - Mod 2 : 14/05/14 - Yam Div F : 16/05/14 - Gixxer : 02/04/2015-15/07/2015 RIP - GixxerMk2 : 16/08/2015

[RhynoCZ]

Try to run it at the top of the rev range at least 5 minutes, it'll clean the engine and could help. In fact, if I ride my ZXR slow whole week, it gets rough, then I do one flat out run and it gets smooth like new again.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[Kickstart]

Hi

Most bikes tend to vibrate at certain rpm. Just when things resonate. But not sure where this normally happens on a CBR125, nor whether the amount of vibration you are getting is unusual for one of them.

[770]

i found out the problem!!!! one of the bolts who holds up the engine in the frame has dissapeared!!??? WTFFFF

[RhynoCZ]