Engine chokes and judders around 5 thou revs

I had a 748 a few years ago and there was a regular occurence of the fuel filter clogging up. This can be found by removing the fuel pump which is inside the fuel tank. Run the tank fairly low on fuel and then once the bike is nice and cool remove the tank. If you now stand it on the front you can remove the fuel pump/filter without fuel pouring out. If I remember correctly it's not a bad idea to buy a new sealing O-ring at the same time as the filter. Having said that I've just reread your post and notice that you say you can ride through the problem so this might be a complete load of tosh as far as helping you! If you do go this route it's also worth checking the air filters as quite a few flies etc get sucked into them. Both jobs worth doing if the bike is new to you, it won't cost a fortune for a fuel filter and you get to have a fiddle with your bike!

My thought on it being the shims is that I would think, personally, that this would affect in a more overall way than just at certain revs. Old plugs/plug leads could also give similar problems. If you don't like taking it apart yourself find a good local dealer. Forza Italia at Silverstone are very good with Ducati's and Baines Racing are there as well, also good with Ducatis.

Hope that helps, even if only a bit!

 

had this with an rc30 only at about 8k revs, it would eventually drive through it and you would have sworn it was fuel. changed plugs and ht leads etc and sorted the prob.