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dolly3900 |
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dolly3900 Traffic Copper
Joined: 12 Jul 2011 Karma :
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Posted: 20:31 - 07 Sep 2018 Post subject: I'm Back And Got A Problem |
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Hiya guys and guyettes, I've been offline for a while, change of job and far too many work commitments meaning too much time in work, nowhere near enough on bike and no time for BCF'ing.
Anyhoo, on to my reason for posting.
My lads (mentioned in previous posts), have all moved on from the trusty 125 now and progressed to various bigger bikes and cages, leaving the poor little CBF125 surplus to requirements.
I have done a bit of cosmetic refurbishment to it and, once looking pretty, it was used for a few months just to get around whilst #1 son had his 650 nicked (long story).
Since then, it has been sat in the shed, lonely and scared, but now I have someone interested in giving it a new home and the love it deserves.
Problem is that when I hit the starter button after checking the usual battery, oil, fuel, etc. the little bugger will just not start.
After testing all sorts of things, did a compression test ant it is reading bugger all, you can put your finger over the plug hole and can hold it there.
Now then, suggestions I've had are rings (would they have fallen out whilst at rest), Valves (left in the fully open position when standing and oil clogged them up to stay open).
Short of stripping the engine down, which I don't have the time for, any ideas from the massive brain and experience that is the BFC collective.
Cheers guys.
Mike ____________________ 2002 Rieju RS2-50 (Sold, spares or repair), 2010 Suzuki DR-125SM (Traded for ->), 2007 Honda CBF 600 (Sold), 2010 Suzuki V-Strom 1000 (Briefly, now returned), 2007 Suzuki Intruder 1800m (Even More Briefly, traded in for ->), 2014 Suzuki V-Strom 650 |
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Oldie |
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Oldie Brolly Dolly
Joined: 05 Dec 2010 Karma :
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Posted: 21:08 - 07 Sep 2018 Post subject: |
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Zero compression
Maybe check the clutch operation? |
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McJamweasel |
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McJamweasel BCF Junkie
Joined: 22 Mar 2002 Karma :
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Islander |
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Islander World Chat Champion
Joined: 05 Aug 2012 Karma :
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jaffa90 |
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jaffa90 World Chat Champion
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Suntan Sid |
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Suntan Sid World Chat Champion
Joined: 07 May 2009 Karma :
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Posted: 00:57 - 08 Sep 2018 Post subject: |
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If it's a valve stuck open, which sounds like a possibility, watch this video, from 14:30 :-
https://www.youtube.com/watch?v=eHLKIEGALvk ____________________ "Everybody needs money, that's why they call it money!" |
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dolly3900 |
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dolly3900 Traffic Copper
Joined: 12 Jul 2011 Karma :
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Posted: 09:54 - 08 Sep 2018 Post subject: |
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Cheers for the replies.
I've tried redex down the plug hole, but no joy, will try a bit of diesel later and see if that works.
I'll take a look at the YouTube video in a bit and see how I go.
Long time away and still the help and response does not disappoint.
Many thanks ____________________ 2002 Rieju RS2-50 (Sold, spares or repair), 2010 Suzuki DR-125SM (Traded for ->), 2007 Honda CBF 600 (Sold), 2010 Suzuki V-Strom 1000 (Briefly, now returned), 2007 Suzuki Intruder 1800m (Even More Briefly, traded in for ->), 2014 Suzuki V-Strom 650 |
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L33n |
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L33n L Plate Warrior
Joined: 23 Aug 2018 Karma :
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dolly3900 |
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dolly3900 Traffic Copper
Joined: 12 Jul 2011 Karma :
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Posted: 10:01 - 09 Sep 2018 Post subject: |
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Re. Stuck rings.
As the bore is not a perfectly parallel cast and honed to an approximate, if the piston stopped when hot at a high point, the oil/carbon build up could make the rings stick in their groves, not against the walls, so when cool and gummed up, they'd not expand enough to take up the slacking the bore, hence no compression due to sticky rings. ____________________ 2002 Rieju RS2-50 (Sold, spares or repair), 2010 Suzuki DR-125SM (Traded for ->), 2007 Honda CBF 600 (Sold), 2010 Suzuki V-Strom 1000 (Briefly, now returned), 2007 Suzuki Intruder 1800m (Even More Briefly, traded in for ->), 2014 Suzuki V-Strom 650 |
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Evil Hans |
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Evil Hans World Chat Champion
Joined: 08 Nov 2015 Karma :
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grr666 |
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grr666 Super Spammer
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Islander |
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Islander World Chat Champion
Joined: 05 Aug 2012 Karma :
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MarJay |
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MarJay But it's British!
Joined: 15 Sep 2003 Karma :
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BusterGonads |
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BusterGonads Trackday Trickster
Joined: 18 May 2018 Karma :
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Posted: 19:04 - 09 Sep 2018 Post subject: |
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OP has tried oil down the plug hole with no joy, so it now looks more and more likely that he has a stuck open valve. The video posted earlier shows an interesting approach to freeing off a stuck valve without having the head off. I remember a loooong time ago riding out with mates on a borrowed 350 BSA single which had an exhaust valve lifter. I think it was a B33. Every bloody time the thing stopped the exhaust valve stuck open and I had the head off at least twice on the ride out which was only about forty miles. Fortunately the head was only held down by four pull down stud things. I don't know what they are called but these things were half way down the barrel on the outside and there were captive studs on the head pointing downwards which engaged with these deep nut / stud things. It took about ten minutes to have the head off, tap the offending valve with a screwdriver handle and 'ping' it shut. Back on and off we went again phutphut phutting down the old A69. This is about half a century ago or very nearly.
You can see the fasteners down near the bottom of the cylinder here. The one I was riding wasn't in this condition.
https://www.carandclassic.co.uk/uploads/cars/bsa/10361485.jpg ____________________ 2016 Triumph Street Twin; 2000 Honda CG125; 1997 Honda Nighthawk CB250 |
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bikenut |
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bikenut World Chat Champion
Joined: 21 Nov 2011 Karma :
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Posted: 11:03 - 10 Sep 2018 Post subject: sticky |
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Yes rings can and do stick, yes valves can and do stick, open usually, so can clutch plates and caliper pistons, a yes valves can even "TANGLE" !!!!!!!!!!
Valves on bikes ( apart from side valves ) , but not all bikes, are usually "inclined" meaning that a stuck open one will be really damaged by a rising piston. Valve, guide, head and piston in real danger, SO ALWAYS CHECK !!
So, at valve overlap,exhaust vale stuck open, opening inlet now opens and TANGLES with the stuck exhaust..........result bent valves etc.......
Valves in line with pistons may "snap back closed" by a rising piston, or as in some car engine etc. bend a push rod or break a rocker arm.......so take notice, there's a poppet. ____________________ nuts about bikes |
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dolly3900 |
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dolly3900 Traffic Copper
Joined: 12 Jul 2011 Karma :
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Posted: 20:04 - 14 Sep 2018 Post subject: |
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Update.......
OK, the lad came home with his boroscope and has taken a look at the internals.
Good news, the valves are opening and closing as they should.
Fuel is getting thrown into the bore as should be.
Bad news, the piston is moving about 3mm when turned over which would suggest that there is something more or less terminal, either broken piston skirt, rod, crank or like that kind of area.
Basically we are fubar.
He's going to drop the engine, strip down, diagnose and act accordingly.
Replace parts if cheap enough.
Possibly a dropped CB? at the local scrappy with much panel damage but probably a good engine.
Will post updates as I get them.
Thanks for the pointers.
Mike ____________________ 2002 Rieju RS2-50 (Sold, spares or repair), 2010 Suzuki DR-125SM (Traded for ->), 2007 Honda CBF 600 (Sold), 2010 Suzuki V-Strom 1000 (Briefly, now returned), 2007 Suzuki Intruder 1800m (Even More Briefly, traded in for ->), 2014 Suzuki V-Strom 650 |
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dolly3900 |
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dolly3900 Traffic Copper
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
Joined: 16 Aug 2013 Karma :
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dolly3900 |
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dolly3900 Traffic Copper
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nowhere.elysium |
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nowhere.elysium The Pork Lord
Joined: 02 Mar 2009 Karma :
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
Joined: 16 Aug 2013 Karma :
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Posted: 20:22 - 23 Sep 2018 Post subject: |
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Fuck me.
Time to buy a new engine, there's no point trying to fix that. I dread to consider what condition the barrel is in. ____________________ trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050 |
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dolly3900 |
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dolly3900 Traffic Copper
Joined: 12 Jul 2011 Karma :
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Posted: 20:37 - 23 Sep 2018 Post subject: |
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
Joined: 16 Aug 2013 Karma :
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Posted: 20:49 - 23 Sep 2018 Post subject: |
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Really? Okay? Apart from the fact it's looking incredibly worn there's this.
https://i.imgur.com/2KEy0i8.jpg ____________________ trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050 |
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dolly3900 |
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dolly3900 Traffic Copper
Joined: 12 Jul 2011 Karma :
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Posted: 21:02 - 23 Sep 2018 Post subject: |
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Yeah, tongue firmly in cheek when I posted.
New barrel and piston on order.
Rest of it being stripped, cleaned, checked and made sure no damage before reassembly. ____________________ 2002 Rieju RS2-50 (Sold, spares or repair), 2010 Suzuki DR-125SM (Traded for ->), 2007 Honda CBF 600 (Sold), 2010 Suzuki V-Strom 1000 (Briefly, now returned), 2007 Suzuki Intruder 1800m (Even More Briefly, traded in for ->), 2014 Suzuki V-Strom 650 |
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dolly3900 |
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dolly3900 Traffic Copper
Joined: 12 Jul 2011 Karma :
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Posted: 16:03 - 26 Sep 2018 Post subject: |
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So, New bits arrived this lunchtime.
Just need to have them fitted after a good clean out and check if the rest.
https://i823.photobucket.com/albums/zz157/mikeallen3lly3900/IMG_20180926_155851_zpsbfgzifci.jpg ____________________ 2002 Rieju RS2-50 (Sold, spares or repair), 2010 Suzuki DR-125SM (Traded for ->), 2007 Honda CBF 600 (Sold), 2010 Suzuki V-Strom 1000 (Briefly, now returned), 2007 Suzuki Intruder 1800m (Even More Briefly, traded in for ->), 2014 Suzuki V-Strom 650 |
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Old Thread Alert!
The last post was made 5 years, 253 days ago. Instead of replying here, would creating a new thread be more useful? |
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