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Any ideas what is wrong?

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Ben. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ben. Quote  Post ReplyReply Direct Link To This Post Posted: 11 Jun 2019 at 20:38
Dave -- you're thrunker than you dink ...
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GUZZIPETE View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GUZZIPETE Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jun 2019 at 07:48
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?
1971 Moto Guzzi V7 Special
1976 Moto Guzzi 850T
1977 Moto Guzzi Convert
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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jun 2019 at 07:55
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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Better 5 minutes late in this world than years early in the next.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote saultrader Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jun 2019 at 08:58
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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GUZZIPETE Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jun 2019 at 09:45
Sometimes it just has to be a process of elimination?
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Paul-l View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Paul-l Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jun 2019 at 20:55
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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GUZZIPETE Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jun 2019 at 21:13
Nice pic. It looks like you have the 4LS front brake on your V7 Special?
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Dave P. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jun 2019 at 21:30
Nice bike to be sure.Hope you don't mind me saying so but that front brake lever geometry could stand a little improvement.
TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.

1971 V7 Special. 1972 850GT.
1970 T120 Bonnie. 2009 500 Bullet.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Paul-l Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jun 2019 at 22:16
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. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jun 2019 at 22:24
I think the V7 sport left the factory with that front tls brake on the back.
TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.

1971 V7 Special. 1972 850GT.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jun 2019 at 22:57
You'll never get it to work like that Paul, it's on too steep a hill. LOL
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Paul-l Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jun 2019 at 19:20
I don't know what you're on about Wink, it works fine downhill!
LOL


Edited by Paul-l - 14 Jun 2019 at 19:23
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Paul-l View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Paul-l Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jun 2019 at 22:19
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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GUZZIPETE Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jun 2019 at 07:51
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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1976 Moto Guzzi 850T
1977 Moto Guzzi Convert
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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jun 2019 at 07:55
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.
Brian.

Better 5 minutes late in this world than years early in the next.
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