I give up... CBR125 noise...

P.addy · Red Rocket Joined: 14 Feb 2008 Karma :

Hey..

After Nemo's GX125 breaking, I lent him my CBR125.

Its been a good runner, but as he was riding home from work...an awful noise started to become apparent.

Bike has now been turned off and only started to film this audio.

https://www.youtube.com/watch?v=gvwjwYJY_u4

This noise does increase in speed with engine revs...the oil is perfect, changed <1000 miles ago with semi synth, its what i had spare.
Its registered as "F" on dipstick...so its full.

I'm needing to sort this as A - its my winter bike... and B its his commuter until ive rebuilt his Laughing

N cee thirty · Banned Joined: 31 Jan 2010 Karma :

not a bolt loose somewhere is it?
____________________
'00 Aprilia RS50 > '92 Honda CG > '99 Yamaha Fazer > '91 Yamaha RXS > '79 Suzuki X5 > 01' Honda Cg > 07' Honda Cg > 82' Kawasaki Z200 > suzuki gsxr 400 gk73a > honda vfr 400 NC30 Mod 2 Passed 09/06/2011

Jewlio Iglesias wrote: I actually did vote BNP once

P.addy · Red Rocket Joined: 14 Feb 2008 Karma :

Rogerborg · nimbA Joined: 26 Oct 2010 Karma :

Sounds like the valves. I'd start here and then move on to the timing chain - get yourself a Haynes manual or Google for a CBR125 workshop manual.

Robby · Dirty Old Man Joined: 16 May 2002 Karma :

Valve clearance is wide open. Have you been fiddling with them and set them with the cam 180 degrees out?

P.addy · Red Rocket Joined: 14 Feb 2008 Karma :

CarlosCBR · World Chat Champion Joined: 12 Mar 2010 Karma :

DO NOT ride it! That is exactly the noise my last engine made before it decided to tear the cam sprocket off its mount, flatspot the cam lobes and heat shear a rocker arm!

Cause was a nackered cam chain tensioner. Take yours off and see if you can push it back in manually, if you can or if it goes in even a small amount then it needs replacing as the mechanism inside wears out. They are apparently notorious for it after about 20,000 miles. Its way too loud to be valves, i know this as the valves needed doing on my replacement engine and were much quieter than the noise of the nackered cam chain tensioner.

Replacement cam chain tensioners are going for about £20 on eBay or you can buy a brand new one (recommended) for about £60.
____________________
https://www.youtube.com/watch?v=1OPv5mDPQ14

https://www.facebook.com/carl.simmonds.7

Casper · World Chat Champion Joined: 12 Jul 2010 Karma :

cam chain tensioner off and hold in a screwdriver shaped bit of metal in there with a rounded end and start bike. Oil will come out and it will vibrate like fook in your hand but push in like mad and if noise goes away or gets quieter then you know its 100% tensioner. Make sure you keep the metal rod straight.

DrDonnyBrago · World Chat Champion Joined: 03 Jan 2010 Karma :

P.addy · Red Rocket Joined: 14 Feb 2008 Karma :

hmmmnz · Super Spammer Joined: 22 Aug 2006 Karma :

probably not the best idea with a screw driver, but a bolt the same thread as the tensioner would be fine,

or as stated pull the rocker cover off, and see if the cam chain is loose, and while you are there you can inspect the cams, and the rockers, and make sure the screw and lock nuts are still in place,
____________________
the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

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

Casper · World Chat Champion Joined: 12 Jul 2010 Karma :

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

But why bother? you can see if a CCT is fucked when you take it off.
____________________
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.

Casper · World Chat Champion Joined: 12 Jul 2010 Karma :

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

Casper · World Chat Champion Joined: 12 Jul 2010 Karma :

P.addy · Red Rocket Joined: 14 Feb 2008 Karma :

G · The Voice of Reason Joined: 02 Feb 2002 Karma :

I've never seen a cam chain tensioner that doesn't push against a guide rail - however I still wouldn't be entirely happy using a screw driver. An appropriate bolt or similar seems a better idea.

In my experience it can be quite hard to just 'tell' if a cam chain tensioner has enough tension or not - unless you've got a 'known to be good' one next to it anyway.

Casper · World Chat Champion Joined: 12 Jul 2010 Karma :

Paulington · World Chat Champion Joined: 11 Mar 2009 Karma :

The only thing I can tell you with ANY certainty is that your top end is definitely gone in some way as previously mentioned.
____________________
"Four wheels move the body, two wheels move the soul."
Current Vehicles: '89 Kawasaki KDX200, '99 Yamaha XV535, '00 Honda ST1100 Pan-European, '08 Suzuki GSX-R1000, '08 Mitsubishi Lancer GS4 2.0 TDCi, '15 BMW 1 Series 116d Sport Turbo.
CBT: 27/08/08. Theory: 04/09/09. Module 1: 16/09/09. Module 2: 01/10/09.

P.addy · Red Rocket Joined: 14 Feb 2008 Karma :

CarlosCBR · World Chat Champion Joined: 12 Mar 2010 Karma :

If its not the CCT, ill eat my hat!
____________________
https://www.youtube.com/watch?v=1OPv5mDPQ14

https://www.facebook.com/carl.simmonds.7

MaybeGuy · Super Spammer Joined: 12 Mar 2007 Karma :

sounds far too regular to be a cam chain tensioner. looks like you'll be eating your hat.

my vote is for a loose tappet or broken rocker (exhaust).
____________________
Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!! Mr. Green

Kickstart wrote: Hi I tend to agree with Matt. All the best Keith

P.addy · Red Rocket Joined: 14 Feb 2008 Karma :