|
Author |
Message |
Ayrton |
This post is not being displayed .
|
Ayrton World Chat Champion
Joined: 02 Sep 2010 Karma :
|
Posted: 22:42 - 25 Nov 2019 Post subject: Engine rattle |
|
|
So my brothers CBR125 started making a rattling noise after we went out on a 100 mile ride a few weeks back and I cant figure out what it is.
We have checked the valve clearances and they are all ok and we also replaced the cam chain tensioner as I read those are common faults but it's still there. It sounds like the noise is coming from the top of the engine.
One thing to mention is after we checked the valves I checked the oil and it wasn't even full enough to be shown on the dip stick. We did lose a little bit of oil when I didn't realise the rocker cover wasn't seated fully and started the bike for a second, but not a massive amount came out. He's insisting he checked the oil recently though
Anyone have any idea what could be the problem?
I've read here https://www.bikechatforums.com/viewtopic.php?t=306188 that the cam bearing tends to be an issue. Is that something I could check without removing it?
heres a video (ignore the smoke, some oil got on the exhaust):
https://vimeo.com/user105573558/review/375470013/7b09ca02c1 |
|
Back to top |
|
You must be logged in to rate posts |
|
|
- |
This post is not being displayed because the poster has bad karma. Unhide this post / all posts.
|
- Super Spammer
Joined: 22 Oct 2013 Karma :
|
|
Back to top |
|
You must be logged in to rate posts |
|
|
stevo as b4 |
This post is not being displayed .
|
stevo as b4 World Chat Champion
Joined: 17 Jul 2003 Karma :
|
|
Back to top |
|
You must be logged in to rate posts |
|
|
Ayrton |
This post is not being displayed .
|
Ayrton World Chat Champion
Joined: 02 Sep 2010 Karma :
|
|
Back to top |
|
You must be logged in to rate posts |
|
|
A100man |
This post is not being displayed .
|
A100man World Chat Champion
Joined: 19 Aug 2013 Karma :
|
Posted: 00:11 - 26 Nov 2019 Post subject: |
|
|
Low oil, hundred mile ride, rattly engine hmm. I suppose it could be connected.. ____________________ Now: A100, GT250A, XJ598, FZ750
Then: Fizz, RS200, KL250, XJ550, Laverda Alpina, XJ600, FZS600 |
|
Back to top |
|
You must be logged in to rate posts |
|
|
Shaft |
This post is not being displayed .
|
Shaft World Chat Champion
Joined: 27 Dec 2010 Karma :
|
Posted: 00:15 - 26 Nov 2019 Post subject: |
|
|
Shame your Vimeo link doesn't work for me, you can get a good idea of what's going on from the sound.
Lighter tinkling/tapping/grating sounds tend to come from the top end, bottom end noises are usually deeper and lean towards rumbling or knocking.
Cam and primary chains make a variety of noises. ____________________ Things get better with age; I'm close to being magnificent........
20 RE Interceptor, 83 Z1100A3, 83 GS650 Katana
WooHoo, I'm a Man Point Millionaire! https://www.bikechatforums.com/viewtopic.php?t=234035 |
|
Back to top |
|
You must be logged in to rate posts |
|
|
Ayrton |
This post is not being displayed .
|
Ayrton World Chat Champion
Joined: 02 Sep 2010 Karma :
|
Posted: 00:39 - 26 Nov 2019 Post subject: |
|
|
Strange it seems to be removed, try this https://streamable.com/9i95a
I understand it's almost definitely related to the oil, I'm just wondering if it's possible to track it down to something that could be easily changed like the camshaft. |
|
Back to top |
|
You must be logged in to rate posts |
|
|
Sister Sledge |
This post is not being displayed .
|
Sister Sledge World Chat Champion
Joined: 17 Aug 2018 Karma :
|
|
Back to top |
|
You must be logged in to rate posts |
|
|
Ayrton |
This post is not being displayed .
|
Ayrton World Chat Champion
Joined: 02 Sep 2010 Karma :
|
|
Back to top |
|
You must be logged in to rate posts |
|
|
Pete. |
This post is not being displayed .
|
Pete. Super Spammer
Joined: 22 Aug 2006 Karma :
|
Posted: 12:29 - 26 Nov 2019 Post subject: |
|
|
Check the exhaust where it bolts to the head. Could just be that it'd loose or blowing. ____________________ a.k.a 'Geri'
132.9mph off and walked away. Gear is good, gear is good, gear is very very good |
|
Back to top |
|
You must be logged in to rate posts |
|
|
bikenut |
This post is not being displayed .
|
bikenut World Chat Champion
Joined: 21 Nov 2011 Karma :
|
Posted: 12:42 - 26 Nov 2019 Post subject: knock |
|
|
Yep sounds expensive......but check the exhaust for a leak and hope......
Remove the plug and look at the piston crown, is there a shiny ring on the crown ?
Check crank and piston movement, are they "in step" or does the crank move ( big end "play" ) with no piston movement at say half stroke??
Check cam area for loss of lub/blueing, and check rocker arm contact pads for camshaft. The cam is on roller bearings....
https://images.cmsnl.com/img/partslists/honda-cbr125r-2004-4-england-crank-shaftpiston_mediumecpp4e1e__1500_6138.jpg
This may not be your exact bike so check..........balance system something to consider/worry about...... ____________________ nuts about bikes |
|
Back to top |
|
You must be logged in to rate posts |
|
|
redeem ouzzer |
This post is not being displayed .
|
redeem ouzzer World Chat Champion
Joined: 06 Oct 2015 Karma :
|
Posted: 13:07 - 26 Nov 2019 Post subject: Re: knock |
|
|
bikenut wrote: | Yep sounds expensive......but check the exhaust for a leak and hope......
Remove the plug and look at the piston crown, is there a shiny ring on the crown ?
Check crank and piston movement, are they "in step" or does the crank move ( big end "play" ) with no piston movement at say half stroke??
Check cam area for loss of lub/blueing, and check rocker arm contact pads for camshaft. The cam is on roller bearings....
https://images.cmsnl.com/img/partslists/honda-cbr125r-2004-4-england-crank-shaftpiston_mediumecpp4e1e__1500_6138.jpg
This may not be your exact bike so check..........balance system something to consider/worry about...... |
I really am going to start downrating every single post where you mention CMSNL.... ____________________ Be a REAL MAN! |
|
Back to top |
|
You must be logged in to rate posts |
|
|
Polarbear |
This post is not being displayed .
|
Polarbear Super Spammer
Joined: 24 Feb 2007 Karma :
|
Posted: 13:56 - 26 Nov 2019 Post subject: |
|
|
That sounds like an exhaust leak to me. Not 'tinny' enough for a top end rattle or 'bangy' enough for the big ends. (good marine engineering terms them )
However diagnosis by computer is rather hit and miss and what can be obvious when you are present isn't over a video.
If it isn't an exhaust leak, it's going to be expensive. A rebuild or new engine I would guess. ____________________ Triumph Trophy Launch Edition |
|
Back to top |
|
You must be logged in to rate posts |
|
|
stevo as b4 |
This post is not being displayed .
|
stevo as b4 World Chat Champion
Joined: 17 Jul 2003 Karma :
|
|
Back to top |
|
You must be logged in to rate posts |
|
|
Ayrton |
This post is not being displayed .
|
Ayrton World Chat Champion
Joined: 02 Sep 2010 Karma :
|
Posted: 20:40 - 26 Nov 2019 Post subject: |
|
|
Unfortunately he drained it into a pan that already had some oil in it so I'm not sure how much came out.
I'm not convinced now that it had low oil though. I just tested the difference between measuring it on the paddock stand (how I measured it earlier) and on the ground and the level drops about half. Given that it also spurted out some when the valve cover was loose it could have been within the correct level when he was riding and we just measure it incorrectly.
Not saying it was as he definitely doesn't check it too often, just an idea Just want to
We just went and checked the exhaust and it is quite tight and I cant see/ feel anything coming out. He did make his own bracket for the head mount though as the old one was thin so I thought it may have caused an issue. I've got a new gasket here for it so I'll give that a god when I get some more time.
Also another recent development when testing it again it ran out of fuel and shut off. Is there any way that could be causing it? |
|
Back to top |
|
You must be logged in to rate posts |
|
|
MCN |
This post is not being displayed .
|
MCN Super Spammer
Joined: 22 Jul 2015 Karma :
|
|
Back to top |
|
You must be logged in to rate posts |
|
|
Shaft |
This post is not being displayed .
|
Shaft World Chat Champion
Joined: 27 Dec 2010 Karma :
|
Posted: 23:54 - 26 Nov 2019 Post subject: |
|
|
Polarbear wrote: | That sounds like an exhaust leak to me. Not 'tinny' enough for a top end rattle or 'bangy' enough for the big ends. (good marine engineering terms them )
However diagnosis by computer is rather hit and miss and what can be obvious when you are present isn't over a video.
If it isn't an exhaust leak, it's going to be expensive. A rebuild or new engine I would guess. |
I agree, that's either an exhaust blow, or something absolutely catastrophic.
Doesn't sound like the sort of metal on metal action you get with oil starvation, unless bearings have shit themselves at both ends of the motor, but then I wouldn't expect it to rev quite so happily.
Stranger things have happened though. ____________________ Things get better with age; I'm close to being magnificent........
20 RE Interceptor, 83 Z1100A3, 83 GS650 Katana
WooHoo, I'm a Man Point Millionaire! https://www.bikechatforums.com/viewtopic.php?t=234035 |
|
Back to top |
|
You must be logged in to rate posts |
|
|
Ayrton |
This post is not being displayed .
|
Ayrton World Chat Champion
Joined: 02 Sep 2010 Karma :
|
Posted: 00:25 - 27 Nov 2019 Post subject: |
|
|
It has an oil screen so I'll check that.
It sounds a bit more metallic in person I think, but it's hard to tell. Here's another video if it helps https://streamable.com/2iisn |
|
Back to top |
|
You must be logged in to rate posts |
|
|
steve the grease |
This post is not being displayed .
|
steve the grease Crazy Courier
Joined: 26 Jan 2018 Karma :
|
|
Back to top |
|
You must be logged in to rate posts |
|
|
Ayrton |
This post is not being displayed .
|
Ayrton World Chat Champion
Joined: 02 Sep 2010 Karma :
|
|
Back to top |
|
You must be logged in to rate posts |
|
|
Pete. |
This post is not being displayed .
|
Pete. Super Spammer
Joined: 22 Aug 2006 Karma :
|
|
Back to top |
|
You must be logged in to rate posts |
|
|
Sister Sledge |
This post is not being displayed .
|
Sister Sledge World Chat Champion
Joined: 17 Aug 2018 Karma :
|
|
Back to top |
|
You must be logged in to rate posts |
|
|
Ayrton |
This post is not being displayed .
|
Ayrton World Chat Champion
Joined: 02 Sep 2010 Karma :
|
|
Back to top |
|
You must be logged in to rate posts |
|
|
stevo as b4 |
This post is not being displayed .
|
stevo as b4 World Chat Champion
Joined: 17 Jul 2003 Karma :
|
|
Back to top |
|
You must be logged in to rate posts |
|
|
bikenut |
This post is not being displayed .
|
bikenut World Chat Champion
Joined: 21 Nov 2011 Karma :
|
|
Back to top |
|
You must be logged in to rate posts |
|
|
Old Thread Alert!
The last post was made 4 years, 122 days ago. Instead of replying here, would creating a new thread be more useful? |
|
|
|