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Flip · 27-09-2020, 08:11 AM

I had a similar issue on my carby 900- exactly the same symptoms you describe- only on very hot days (we get a few in the UK) and usually when in heavy traffic which is not my normal riding environment.

It turned out to be a fuel vapour lock caused by the deterioration of both the vacuum fuel tap and the vacuum fuel pump diaphragm. The fuel pump is re-buildable but the tap isn’t so needs to be bought as a replacement Ducati part.

While I was doing that I also replaced all the vacuum and fuel supply hoses so at the very least it would be worth checking for any cracks or splits in those as the vacuum pipes would also not help the pumps supplying enough fuel to the carbs.

27-09-2020, 08:11 AM	#3
Flip Registered User Join Date: Mar 2010 Location: Beachtown Bike: M900 Posts: 2,188	I had a similar issue on my carby 900- exactly the same symptoms you describe- only on very hot days (we get a few in the UK) and usually when in heavy traffic which is not my normal riding environment. It turned out to be a fuel vapour lock caused by the deterioration of both the vacuum fuel tap and the vacuum fuel pump diaphragm. The fuel pump is re-buildable but the tap isn’t so needs to be bought as a replacement Ducati part. While I was doing that I also replaced all the vacuum and fuel supply hoses so at the very least it would be worth checking for any cracks or splits in those as the vacuum pipes would also not help the pumps supplying enough fuel to the carbs. __________________ You're perfect, yes, it's true- But without me you're only you! Last edited by Flip; 27-09-2020 at 08:13 AM..