CG125 making a scrapping noise

Titaniumplanc... · L Plate Warrior Joined: 02 Oct 2015 Karma :

Hi all,

Just brought myself a CG125, 1989 BR model. Ive had one before and they are great.

The bike is generally in good condition, it starts first kick, has power and gear selection is easy.

However, there is a scrapping noise from the engine area at speeds between 35-50mph. It happens both while under power and deccelerating and occassionally when slowing it will carry on making the noise down to 20mph. The clutch is quite near the end of its travel and i think needs replacing, however im unsure of why the noise isnt predictable with all clutch use i.e. 1st and 2nd at lower speeds.

So it makes me think its something else.

Thanks in advance

Rogerborg · nimbA Joined: 26 Oct 2010 Karma :

Could be almost anything.

Does it do it while it's in neutral?

Does it do it while the bike's on the centre stand, in gear, with the rear wheel spinning?

Or does it only do it while the front wheel is turning?
____________________
Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

Titaniumplanc... · L Plate Warrior Joined: 02 Oct 2015 Karma :

Hi,

Yeah i know, im finding it difficult to be more specific, about to take it out again so will see.

No not in neutral

Bike doesnt have a centre stand but ill get my mate to lift it up tomorrow

And ill have a go at look at the front to.

Thanks

Rogerborg · nimbA Joined: 26 Oct 2010 Karma :

Sorry we can't be more help. Given that it's a CG, it's not going to be that expensive, when you figure it out.
____________________
Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

FlightRisk · Spanner Monkey Joined: 08 Jul 2014 Karma :

Chain shockingly loose and scraping off something?
Just a thought.
____________________
Honda CB500S

mudcow007 · World Chat Champion Joined: 01 Feb 2012 Karma :

chain cover?

Mine would need a weekly "adjust"

bypass2 · Spanner Monkey Joined: 12 Sep 2013 Karma :

Back wheel alinement badly adjusted. Back sprocket nuts/bolts scraping something. chain gaurd loose

blurredman · World Chat Champion Joined: 18 Sep 2010 Karma :

Find a hill

Put it in neutral. Engine off..

Get up to speed. Does it make this sound?

Put it in top..gently... Does it make the sound?
____________________
CBT: 12/06/10, Theory: 22/09/10, Module 1: 09/11/10, Module 2: 19/01/11
Past: 1991 Honda CG125BR-J, 1992 (1980) Honda XL125S, 1996 Kawasaki GPZ500S, 1979 MZ TS150.
Current: 1973 MZ ES250/2 - 18k, 1979 Suzuki TS185ER - 10k, 1981 Honda CX500B - 91k, 1987 MZ ETZ250 (295cc) - 40k, 1989 MZ ETZ251 - 51k.

Titaniumplanc... · L Plate Warrior Joined: 02 Oct 2015 Karma :

Hi all,

Thanks for the advice, didnt get a chance to take the bike out yesterday, i had to be in the house for various reasons.

However, i have a bit of mechanical knowledge so i took the RH cover off, exposing the clutch. Only thing i noticed was play in the clutch plates, within the outercover.

In terms of rotation there was a little, which i guess is normal
But wiggling the plates up and down (like checking for play in a wheel) also produced quite a bit of movement. is this also normal?

I dont believe its the chain or chain guard. I guess it could be the rear tyre not being aligned but it really doesnt look out.

Taking it for a spin today for sure so will try what has been suggested.

Thanks all

Titaniumplanc... · L Plate Warrior Joined: 02 Oct 2015 Karma :

Hi All,

Took the bike out yesterday,

The noise began in 5th at around 50mph. It seems to be related to temperature of the engine since it only made the noise returning, not going to my friends, when i stopped a few times.

1) The noise started so i turned the engine off - noise carried on
2) Put it into netural - noise went as soon as i changed into 4th gear
3) Pulling in the clutch did nothing, it was the gear change that stopped it.

All the above was done while rolling, by the time i had finished No.3 i would have been doing around 40mph

Thanks

chris-red · Have you considered a TDM? Joined: 21 Sep 2005 Karma :

You've jumped to stage 2/3 before doing the simple stuff.

First things first, Check the chain tension and check the wheel bearings.
____________________
Well, you know what they say. If you want to save the world, you have to push a few old ladies down the stairs.
Skudd:- Perhaps she just thinks you are a window licker and is being nice just in case she becomes another Jill Dando.
WANTED:- Fujinon (Fuji) M42 (Screw on) lenses, let me know if you have anything.

Titaniumplanc... · L Plate Warrior Joined: 02 Oct 2015 Karma :

Your quite right, I had a look at the chain tension, it has about an inch of movement up and down which as far as i can remember is ok.

Both wheel bearings appear to be ok in terms of sound and play.

chris-red · Have you considered a TDM? Joined: 21 Sep 2005 Karma :

What is the tension like when you sit on it?
____________________
Well, you know what they say. If you want to save the world, you have to push a few old ladies down the stairs.
Skudd:- Perhaps she just thinks you are a window licker and is being nice just in case she becomes another Jill Dando.
WANTED:- Fujinon (Fuji) M42 (Screw on) lenses, let me know if you have anything.

Titaniumplanc... · L Plate Warrior Joined: 02 Oct 2015 Karma :

its fine when i sit.

ive noticed that its on longer rides it starts and today when i pulled up i left it idling and took my helmet off and i could hear every now and again and regular intervals the same sound - couldnt quite work out where its from though.