Any ideas what is wrong? |
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Ben.
Senior Member Joined: 18 Mar 2015 Location: Lanjaron Spain Status: Offline Points: 937 |
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Dave -- you're thrunker than you dink ...
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GUZZIPETE
Senior Member Joined: 29 Jul 2016 Location: Devon Status: Offline Points: 198 |
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Possibly a coil breaking down. I believe that any issues with them generally surface after they have warmed up.
It might be worth trying a replacement to see if it makes a difference?
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1971 Moto Guzzi V7 Special
1974 Laverda 750 SF2 1979 Laverda 3CL |
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Online Points: 17641 |
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Been there with that one. Spada III suddenly cut out in France. Did all the usual checks, and there was a spark. Bike then restarted OK so off I went only for it to stop again 2 or 3 miles later. Fuel? all seemed OK, so ran with the fuel cap off. Same again, it would run for a couple of miles then stop. two minutes later started up fine. Replacement coil cured it eventually. It had the Rita system with a twin output Dyna coil, so coil breakdown killed the engine. With twin coils it would only cut one cylinder.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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saultrader
Senior Member Joined: 12 Dec 2014 Location: Gloucesterhire Status: Online Points: 267 |
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I had similar symptoms a few years ago and tried all of the aforementioned solutions, I even mentioned the problem on another forum stating that I'd replaced everything but the frame and someone replied doubting that replacing the frame would help.
I hadn't replaced everything though, a pair of new coils and it ran like a watch. |
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GUZZIPETE
Senior Member Joined: 29 Jul 2016 Location: Devon Status: Offline Points: 198 |
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Sometimes it just has to be a process of elimination?
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1971 Moto Guzzi V7 Special
1974 Laverda 750 SF2 1979 Laverda 3CL |
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Paul-l
Senior Member Joined: 07 Sep 2018 Location: Somerset Status: Offline Points: 133 |
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I'm getting the feeling that I've ended up with a selection of faults all coming together at once!
So far I've got: Bad condenser, a leaky carb float, some muck in the fuel tank, inadequate ven on the filler cap, some potentially iffy HT leads, and a rotor arm that I should have replaced before starting out! Trouble is that I doubt I will nail it down to one cause, but so long as it ends up working fine at the end then I'll be happy. Anyway here's a picture from a few weeks ago - it needed taking! Edited by Paul-l - 13 Jun 2019 at 21:00 |
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GUZZIPETE
Senior Member Joined: 29 Jul 2016 Location: Devon Status: Offline Points: 198 |
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Nice pic. It looks like you have the 4LS front brake on your V7 Special?
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1971 Moto Guzzi V7 Special
1974 Laverda 750 SF2 1979 Laverda 3CL |
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Dave P.
Senior Member Joined: 12 Jan 2015 Location: Northants Status: Offline Points: 5573 |
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Nice bike to be sure.Hope you don't mind me saying so but that front brake lever geometry could stand a little improvement.
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TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.
1971 V7 Special. 1972 850GT. 1970 T120 Bonnie. 2009 500 Bullet. |
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Paul-l
Senior Member Joined: 07 Sep 2018 Location: Somerset Status: Offline Points: 133 |
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True, but it's still a bit grabby even with the levers like that.
The fun thing is that the rear brake is a re-purposed front brake, probably its original front one.
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Dave P.
Senior Member Joined: 12 Jan 2015 Location: Northants Status: Offline Points: 5573 |
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I think the V7 sport left the factory with that front tls brake on the back.
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TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.
1971 V7 Special. 1972 850GT. 1970 T120 Bonnie. 2009 500 Bullet. |
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Online Points: 17641 |
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You'll never get it to work like that Paul, it's on too steep a hill.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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Paul-l
Senior Member Joined: 07 Sep 2018 Location: Somerset Status: Offline Points: 133 |
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I don't know what you're on about , it works fine downhill!
Edited by Paul-l - 14 Jun 2019 at 19:23 |
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Paul-l
Senior Member Joined: 07 Sep 2018 Location: Somerset Status: Offline Points: 133 |
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I'm assuming the coil shouldn't leak oil, or make a sloshing noise when shaken?
I had thought the oil was left over from over use of wd40 at some point Will any old 12V coil work?
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GUZZIPETE
Senior Member Joined: 29 Jul 2016 Location: Devon Status: Offline Points: 198 |
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Personally, I'd use a new one, or at least one you know to be in GWO. Otherwise you could lead yourself down the wrong path.
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1971 Moto Guzzi V7 Special
1974 Laverda 750 SF2 1979 Laverda 3CL |
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Online Points: 17641 |
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Paul, check the primary resistance for the coil, measure the other coil too. Probably around 4 ohms. Just make sure any coil you fit has about the same primary resistance. Loads of 12v coils available, Ebay can be a cheaper source.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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