Dellorto blues, I've reached my limit Options

[barefoot]

For several years after After I but it all back together the car's been running fine, had to clean one carb once and that worked fine. Now it's getting worse won't idle, it just dies after I let off the throttle. Runs strong at higher loads but very poor at idle & low load. I've cleaned the carbs enough that think I could do it blindfolded. I know the points dwell is OK and I haven't touched the advance. Using a heat gun i can measure header pipe temps just before muffler and one cylinder on each bank is way lower temperature than it's neighbor after holding the rpm's just above idle speed.
Think I'll pull the carbs off and do a compression check just to rule out one thing.
Can't even do a synchronize without a smooth idle.
Is there someone in our group who is Dell 40 expert so i can send carbs off to ???
I've prided myself as a competent mechanic but this has got me on the edge.
Not having fun anymore (IMG:style_emoticons/default/headbang.gif)

Barefoot

[fixer34]

Not familiar with carbs on a -4, but something doesn't sound right here.
One cylinder exhaust on each side is lower temp? So it isn't firing all the time.
If there are 2 carbs, one for each side, I would think it highly unlikely that both would have the exact same symptoms. Sounds more like a spark/plug firing issue.
I would give the rotor, cap, and wires a good going over.

[infraredcalvin]

Not familiar with carbs on a -4, but something doesn't sound right here.
One cylinder exhaust on each side is lower temp? So it isn't firing all the time.
If there are 2 carbs, one for each side, I would think it highly unlikely that both would have the exact same symptoms. Sounds more like a spark/plug firing issue.
I would give the rotor, cap, and wires a good going over.

Simple things first, check for spark