Good morning group...I recently purchased a '90 FLHTC with 37K on the clock, in excellent condition. Lately, I have had an occasional "hiccup" I am assuming from the CV carb, mainly occurring around 3100-3200 RPM, at cruising speed. Sometimes, I can ride all day with no symptoms, and like yesterday, I will get 2-3 hics, level out for 5-10 miles then more hics. This is my first CV carb, and I'm not sure where the problem lies. Any suggestions out there?

 

Check your plugs.

 

My first thought would be improper breathing of the fuel tank.
I don't know how the older bikes vent , but it probably has a pressure/vacuum gas cap.
You would have to see how your bike vents and make sure it does vent properly.
You could ride with the fuel filler cap just a bit loose and see if you can duplicate it , if it's fine , you found the problem.
A buddy of mine had a tank that partially collapsed when he had a bad gas cap , fuel injected bikes can do this , but carb bikes just lean cough usually.
Just a thought before you go digging around in the carb for a solution.
Mick