LM2 right cylinder running very rich

[Stevex]

Since riding the Le Mans after winter storage the right cylinder has been running very rich. Symptoms were occasional missing and back firing. Pulling both plugs showed the left side normal and the right one black but dry. I pulled the right carb apart, choke is free and bottoming, needle has no wear, floats are not leaking and float height is 18mm. Needle valve is working and looks good. I removed the atomiser and it looks ok, no obvious ovaling. Last year the right side occasionally chucked out some black puffs according to the wife, following on her bike, but it didnt miss or back fire.
Any advice please, I dont want to start chucking new carb parts at it without an idea Im heading in the right direction.
How much atomiser wear would cause the carb to run rich, with no obvious ovalling?

[Frenchfrog]

Couldn't say but whats the mileage ?  Personally a  new set of atomisers and needles ( they wear too !) would not be unreasonable for any bike over twenty years old and yours might be the originals?
Then there is valve guide wear perhaps...
A suggestion would be to swap the atomisers over and see what happens with new plugs?

[JoeW]

The choke plungers get hard and worn. Just because it's bottoming doesn't mean it is sealing. Usually, a leaky choke acts up more at idle than at speed.

[guzzisteve]

If you have aluminum needles, they wear faster than the atomizer. Check idle mix is correct. If you pull 1 plug wire off the cylinders should fire same amount of times at idle.

[wirespokes]

Keeping with the adage that 90% of carb issues are electrical, what plugs are you running? Perhaps a weak spark on the right side? Poor connections to the right coil?

If it was running fine when parked, poor electrical connection makes more sense to me.