You should be able to check the diaphragm/slider action without running the engine. Lift the slides with your finger and let them drop. They should drop slowly and approximately the same speed. If one drops quicker, that's the one to look more closely at. Mind you, my only experience is with Keihins.
Also, don't EVER spray carb cleaner into the carb inlets. Destroys the diaphragms.
And yes, the split diaphragm will definitely give the symptoms described. Also, the fallen out enrichment jets from the floats will cause hard starting.
--- In TriumphTrophy@yahoogroups.com, "stevec1200brg" <stevec1200brg@...> wrote:
> Thank you all for some very good advice.
> Thanks Bob I understand Suzuki fit these Mikuni carbs and parts are less expensive too.
> I like dealing with Triumph I get free postage, the guy there really knows his stuff it's kinda worth the extra money. I know that sounds like I've more money than sense. But that's not true I have no money AND no sense.
> Thanks Greg You say I probably won't need a new slide I hope you're right all mine seem okay. but I've nothing to compare them to.
> A2. That's a really good idea I'll run the bike with the air filter off and see if the sliders raise and fall together. Obviously sticky ones represent a problem.