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CG 125 rumbling from crankcase

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speedingmotor...
Two Stroke Sniffer



Joined: 24 Jun 2014
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PostPosted: 17:57 - 17 Oct 2017    Post subject: CG 125 rumbling from crankcase Reply with quote
hello BCF and Teflon Mike

I have a CG125 that a friend gave me 1979 the year, it is making some vibrations and loud rumbling when accelerating and at speed. when i pull in the clutch its a rather smooth ride, which leads me to believe there is a problem with the chain sprocket, clutch or gearbox. I have the clutch puller and I am thinking of breaking down that side of the motor.

EDIT: does anybody have ideas about how to go about troubleshooting the rumbling and rough vibrations?

anything i should look for? or am i an idiot

Karma
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Commuter_Tim
World Chat Champion



Joined: 09 May 2013
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PostPosted: 20:12 - 17 Oct 2017    Post subject: Reply with quote
speedingmotorcycle wrote:
hello BCF and Teflon Mike...

Oh you son of a bitch, you have no idea what you just did. Laughing

Inb4 loose engine mount bolt. (...and a serious Teffing no doubt)
It happens curiously often with CGs though.

Chain you can easily rule out, just be meticulous checking your chain tension all the way around (plenty of guides on the intarwebs).
Then wiggle each link and make sure none are rusted tight or massively loose/damaged.
It's highly doubtful anybody chucked an Oring chain on a CG, so no worries there.

It couldn't hurt to whip the wheel off and check the cush drives too (rubbery stuff that sits behind the rear sprocket to dampen vibration)
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The above post is most likely nonsensical.

I ride a Bandit 600... badly.
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mauzo
Nova Slayer



Joined: 30 Jun 2015
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PostPosted: 10:51 - 18 Oct 2017    Post subject: Re: CG 125 rumbling from crankcase Reply with quote
speedingmotorcycle wrote:
does anybody have ideas about how to go
about troubleshooting the rumbling and rough vibrations?


Check the stand isn't contacting the chain when it's up.
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'04 CG125, '07 CBF500
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speedingmotor...
Two Stroke Sniffer



Joined: 24 Jun 2014
Karma :
PostPosted: 12:16 - 18 Oct 2017    Post subject: Reply with quote
hey thanks for the replies

Quote:
Check the stand isn't contacting the chain when it's up.


i assume you mean the kick stand?


Quote:
loose engine mount bolt


i checked and found one kind of loose, i cant seem to find in the haynes manual how many there are :-0
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speedingmotor...
Two Stroke Sniffer



Joined: 24 Jun 2014
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PostPosted: 15:40 - 18 Oct 2017    Post subject: Reply with quote
Karma Karma Karma

tightened that bolt and now its sooooo smooth

Smile

thanks BCF (and of course Teflon Mike)
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Last edited by speedingmotorcycle on 08:43 - 19 Oct 2017; edited 1 time in total
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mauzo
Nova Slayer



Joined: 30 Jun 2015
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PostPosted: 19:29 - 18 Oct 2017    Post subject: Reply with quote
speedingmotorcycle wrote:
hey thanks for the replies

Quote:
Check the stand isn't contacting the chain when it's up.


i assume you mean the kick stand?


If you've got both, then either stand. Mine only has a centre stand.
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'04 CG125, '07 CBF500
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Old Thread Alert!

The last post was made 6 years, 184 days ago. Instead of replying here, would creating a new thread be more useful?
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