2016 Eldo, intermittent rough running

[John in PA]

My 2016 Eldo with around 6000 miles on it's last two outings had several bouts of rough running.  A few weeks ago, after running perfectly for 30-40 minutes, it would break up and run quite rough while gently rolling throttle on mostly between 3000-4000 rpm. *Blipping the hthrottle off and then applying it aggressively would make the problem vanish immediately, only to have it re-occur a minute or so later. It did this probably 20-30 times during the next half hour.  I wondered if I had gotten bad fuel. I decided to end the ride, returned home, garaged the bike and didn't ride it for about 3 weeks. (Kind of forgot I had the problem, truth be told)

Anyhow, I took it out again today. I ran beautifully for 30 miles or so, then began to repeat the previous performance. I topped up with 3 gallons of fresh fuel, hoping for a cure. Problem continued for another 15-18 miles till I decided enough was enough, and I was getting farther and farther from home.  My buddy and I pulled off the road , I stopped the engine for a couple minutes to talk to my my riding buddy and tell him I was doing an about face before things got worse and headed home.

 During the entire 45 minute ride home the bike did not misbehave one time. I even tried to duplicate the throttle roll-ons, rpms, and throttle position that would make it break up before. It ran perfectly!

Any known intermittent issues that I should search out? What's the check list?

 Again,first running fine for 30-40 minutes, but then breaking up, running very rough with steady throttle to gentle roll-on,  mostly in the 3-4000 rpm range. Blipping throttle off and then more aggressively on corrects the problem, but usually only for 30-45 seconds. Did it repeatedly for 20-30 minutes.   But then, after a very brief rest period,it ran perfectly for another 45 minutes.

[Zoom Zoom]

Do you have a spoofing device on the bike? If so, perhaps disconnect that and see if it makes a difference.

ZZ

[lucian]

Without plugging the bike into a diagnostic tool like guzzidag or Pads to check for stored faults, it is difficult to say for certain what the problem is. Short of doing that, the first things I would check are the simplest.  If it happens again I would immediately stop , shut the engine off, remove my helmet and then slowly crack open the gas cap while listening for air suction. Could be a sticking tank vent valve. 
 Next I would suspect a shorting plug cap , especially if the bike had gotten wet , or given a bath with a hose.
 
 These bikes have a myriad of sensors that could contribute to rough running  should one malfunction and that,s where the OBD comes into play. Search the guzzidiag thread and consider getting the cable and software you'll want to have if you plan on doing your own diagnostics/ service.  Best of luck with it being a simple fix.

PS the factory lean fueling on these bikes tend to run rough in slack throttle situations in the lower rps.  Even more so when the engine reaches full operating temp. and the fueling moves from the richer warm up map function to the  main fuel map. Around 3000 rev's is where the map is changing from open to closed loop operation and this could be all you are experiencing. Those with expertise in this should be along to elaborate, A corrected fuel map may be all you need .

[drbone641]

Bad gas is gone. Go forth and sin no more

[moto-uno]

   ^  Are you talking about digestive irregularities  . Peter

[drbone641]

So, hows she running now?