UK Monster Owners Club Forum - View Single Post - Rough running low down and high idle when warm

Flip · 20-03-2020, 07:53 PM

For another view on valve adjustment and how service intervals and the subsequent running costs of Ducati’s have changed over the years as a result, have a ponder over Neil Spalding’s thoughts.

http://www.sigmaperformance.com/service-interval.html

Now onto the reason I asked about the battery- it is just possible that yours is starting to ‘soft-short’. It’s really hard to detect and it usually won’t register as weak on an Optimate type charger and even more tricky it will often pass a ‘drop test’ too. Only after the bike has been running a few minutes (especially if the charging system is putting in 14v+ which is too high for a sealed battery float charge) it can then show up as a mis-fire, admittedly this would be more likely in a fuel injected motor running a fuel pump and associated ECU but I suppose it is possible it’s somehow sapping power to the coils or igniter boxes?

There’s a lot to read but worth it here:

https://batteryuniversity.com/learn/...internal_short

20-03-2020, 07:53 PM	#45
Flip Registered User Join Date: Mar 2010 Location: Beachtown Bike: M900 Posts: 2,188	For another view on valve adjustment and how service intervals and the subsequent running costs of Ducati’s have changed over the years as a result, have a ponder over Neil Spalding’s thoughts. http://www.sigmaperformance.com/service-interval.html Now onto the reason I asked about the battery- it is just possible that yours is starting to ‘soft-short’. It’s really hard to detect and it usually won’t register as weak on an Optimate type charger and even more tricky it will often pass a ‘drop test’ too. Only after the bike has been running a few minutes (especially if the charging system is putting in 14v+ which is too high for a sealed battery float charge) it can then show up as a mis-fire, admittedly this would be more likely in a fuel injected motor running a fuel pump and associated ECU but I suppose it is possible it’s somehow sapping power to the coils or igniter boxes? There’s a lot to read but worth it here: https://batteryuniversity.com/learn/...internal_short __________________ You're perfect, yes, it's true- But without me you're only you!