My 1200 8v won't run on left pot,new plugs and have spark cleaned injection getting fuel, still won't run on 2 pots. Right cylinder is running fine. Help please .
little750 GRiSO Capo
Posts : 218 Join date : 2014-05-07 Age : 69
Subject: Re: Won't run. Sat Mar 12, 2022 5:28 am
Plug cap shorting to head maybe.
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Banders Montanarolo
Posts : 15 Join date : 2022-03-12
Subject: Re: Won't run. Sat Mar 12, 2022 5:57 am
Hi I have ngk plug caps fitted. So hopefully not, I'll replace them and see what happens.
JohnA GRiSO Capo
Posts : 765 Join date : 2015-01-13 Age : 67
Subject: Re: Won't run. Sat Mar 12, 2022 5:59 am
Do a search on Spark Plug Cap and you’ll find plenty of info there. It’s a pretty often occurrence.
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little750 GRiSO Capo
Posts : 218 Join date : 2014-05-07 Age : 69
Subject: Re: Won't run. Sat Mar 12, 2022 6:18 am
Bad new plug try an old one.
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Banders Montanarolo
Posts : 15 Join date : 2022-03-12
Subject: Re: Won't run. Sat Mar 12, 2022 7:15 am
Plugs fine plug caps fine injection fine. Iam at a loss, and pi---d off
JohnA GRiSO Capo
Posts : 765 Join date : 2015-01-13 Age : 67
Subject: Re: Won't run. Sat Mar 12, 2022 7:38 am
There is a long thread called “dead cylinder” you might take a look at that.
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JohnA GRiSO Capo
Posts : 765 Join date : 2015-01-13 Age : 67
Subject: Re: Won't run. Sat Mar 12, 2022 7:39 am
Go to the search function….
Banders Montanarolo
Posts : 15 Join date : 2022-03-12
Subject: Re: Won't run. Sat Mar 12, 2022 7:54 am
Am new to this site can you tell me how to get the search function? Thanks.
Search button is on the top menu bar between FAQ and Members after you log in
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Pete Roper GRiSO Capo
Posts : 10711 Join date : 2013-05-29 Age : 67
Subject: Re: Won't run. Sat Mar 12, 2022 2:15 pm
Was it running fine and then suddenly dropped a cylinder or did it just not fire on that cylinder when you first tried to start it?
It does sound like it a typical shorting plug cap but if they have been swapped out that has probable been covered.
A few other questions. Has it been rollerised? How many miles has it traveled? Were there any symptoms before it quit? Was it pulling cleanly to redline?
Banders Montanarolo
Posts : 15 Join date : 2022-03-12
Subject: Re: Won't run. Sat Mar 12, 2022 2:36 pm
Was running fine, parked up for 20 minutes then just stopped running on the left cylinder. I was just back from a week in the Highlands of Scotland ran perfectly, was rollerised end of 2020 in a guzzi dealer. Mileage is 17000mls,never been to the redline. Got me puzzled.
Pete Roper GRiSO Capo
Posts : 10711 Join date : 2013-05-29 Age : 67
Subject: Re: Won't run. Sat Mar 12, 2022 3:15 pm
It may of never been to redline but what happens at about 6,000rpm if you're trying to accelerate hard? Does it feel like you've suddenly run out of puff regardless of what gear you're in?
You're confident it has fuel and spark? On the side that has failed you can still see a spark if you hold the plug to the head and spin the motor?
If the answer to this is yes then the next step would be a compression test. Disconnect the injectors, throttle wide open and you should get about 175-180 psi.
I'm still not confident it's a mechanical issue, it sounds too sudden and the fact it started after the engine was stopped is still making me think spark as the likely culprit but let's rule out the nasties by the easiest means possible then you can go back to concentrating on the little things.
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GuzziSteve Fra Cristoforo
Posts : 828 Join date : 2016-04-14
Subject: Re: Won't run. Sat Mar 12, 2022 4:01 pm
Check wires are plugged in tight to coils, I seen them unplug but still intact in boot.
Subject: Won't run. 
Sat Mar 12, 2022 5:18 am
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