749S Misfire
 

I've got a Ducati 749S (2003) that's recently developed an intermittent
misfire.
Last run it went onto 1 cylinder for a couple of seconds then
cleared, then the same happened again. It was then fine all the way back (40 odd miles).
Started up fine this morning, after about a mile it went onto to 1
cylinder, backfiring then would chirp back onto 2 cylinders then down to 1
again. Managed to get it back virtually 1 cylinder all the way (1 mile ). Had a good look over it but nothing seems obvious.

Any advice/cure would be greatly appreciated.

Thanks
Geoff

Not had any problems myself, but, have heard many many 749 and 999 owners talk about problems with coils / spark plug caps. Seems the front one is the obvious one, gets hit by all the crud from the front tyre.

Take it off, give it a good clean, loads of WD or similar and put it back.

I'm sure someone who has first hand knowledge will be along soon.

Mine are also kind of glued in with a silicone as well!...........

my one was the back cylinder, lot's of water and crud and thats with a rear huger,

As mentioned already, it does sound like a faulty coil. You can tell which cylinder isn't firing by checking which exhaust pipe isn't getting hot.
Once you've identified the problem cylinder, remove coil & clean as suggested above. If cleaning doesn't work, I have a spare pair of coils (used but work perfectly) & would sell one of them. Let me know if you're interested.

Fault :- Water in the plug holes clean coil and plug tops (these may even be loose) spray with wd 40 and seal with silicon jobs a good un! do not buy new coils until you've done the above. Mines done it several times before I sealed them up.

Cheers Seb

Firing on all 2
 

Thanks for the feedback everybody.

New plug (old one was well corroded) and a good clean/spray and I'm back up and running!

Thanks again - Geoff