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?

 

Your pilot jet is too lean.
Increase it until the "sneeze" is gone.
Also, remove the welch plug, to expose the air/idle mixture screw, and set it at 3 turns out, for starters.
Scott

 

Scott, thanks for your suggestions. How do I adjust the "pilot jet"? Is it an internal or external adjustment? Also, I am unfdamiliar with the Welch plug...where do i find this on my carb?

 

Give us a yell, and we will walk you though it.
Scott

 

I may have an opportunity to buy a 1990 FLHTC soon....other than the hiccup, are you satisfied with yours?

 

I have been totally satisfied...never found the cause of the hiccup, and it continues to this day, on occasion. I just completed a round trip from LA to Orem, Utah in the July-Aug desert heat, and only a few hics during the entire trip. Someone also suggested that it may have something to do with tank venting...My latest bugaboo is a possible wiring malfunction in the headlamp/running light circuit.

 

Also, you may want to consider that it seems that '90 was a bastard year. Most replacement parts and aftermarket items are for XX-'89, and '91-up.