Stumble just off idle.

[RodeRash]

I'm having problems on my 97 BlackBird. I get a stumble just off idle. The bike runs and idles just fine, but when I start out easy, it feels and sounds like it drops to 3 cylinders, then picks right back up. If I have the bike in neutral, and rev the throttle, there is a hesitation right off idle, then it clears out. The exhaust system is stock. The plugs have around 6000 miles on them. I noticed this problem before I replaced the air filter. Replacing the filter did not help. Could this be a carb sync problem?

Any other ideas?

[Pete in PA]

If your idle is smooth, with no surgeing/hunting, then sync. should be on.

Have you played with the pilot screw settings? If they are still at factory settings,turn them in till they seat lightly then out 2 1/2 turns. The factory has these almost shut off for emissions.These screws are on the bottom of the carbs and look like a circle with a small straight section. If you don't have the tool, try a .17 or .22 rimfire rifle case and put a slight dent in it at the rim.

[RodeRash]

Thanks for the info Pete. This is a new problem. I am thinking that I may have a little gummy fuel in the pilot jets. I have only run a couple of tanks of fuel through the bike this winter. I am going to first try adding some BG44K cleaner to a tank of fresh gas to see if this will clear things up. If not, then I will pull the carbs, clean them, use your pilot jet settings as a starting point, sync the carbs, and then check the settings with an exhaust analyzer.

If that doesn't work, I'll trade the bike for a newer one with FI

[RodeRash]

Fixed the problem. Removed and cleaned the low speed jets. Didn't need to mess with anything else.