This is a video I took today of the infamous GL1800 stumble. Please let me know if this is what others are experiencing as well. Some background. The bike had been ridden a short distance, then parked outside for about 30 minutes. Ambient temperature outside was ~75 degrees. Immediately after stopping the video I hit the 'info' button and it displayed the temperature as 86 degrees. I tried to get a shot of my throttle showing that there was no movement of the throttle though you can clearly see the RPM's fluctuating.
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That is not what mine is doing. Your bike temp was much warmer than when mine stumbles.GOLDWING AND F6B MAINTENANCE VIDEOS
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That is the top range of when it stumbles. If it's much higher than that, it won't stumble. My point was that many people have said, just let your bike warm up to above the bottom line, and it won't happen(actually that's what Honda says), but as the video shows, that's not the case.
Cruiseman, do you think that your ECM reflash had any effect on when/how this happens, and is the fluctuation in RPM's what you experience, just in a slightly different temp range?Costa Mesa, CA
2012 RED GL1800
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Originally posted by glarson3 View Post
Cruiseman, do you think that your ECM reflash had any effect on when/how this happens, and is the fluctuation in RPM's what you experience, just in a slightly different temp range?GOLDWING AND F6B MAINTENANCE VIDEOS
Save $1000 a year in labor by doing your own maintenance!
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Originally posted by glarson3 View PostMine has nothing to do with load. As you can see, it's in neutral, but mine seems to be right around this location on the temp.Dave - High up in Arizona - Black Metallic 2019 DCT
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At least now, maybe we can get some consensus of those who have complained about the stumble, if we're really talking about the same thing. This is the exact same behavior I've been experiencing since very soon after my purchase. The first time I experienced it, I pulled over(wife to be on the back) and stopped. We were on our way to the chapel to be married. She though I had cold feet. Now I can prove to her it wasn't.Costa Mesa, CA
2012 RED GL1800
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My theory : In Japan motorcycles over 250cc must meet strict emissions regulations and their tests include a "hot test" as well as a "cold test" along with an actual running test that simulates slower speed riding. With this showing up after the move to Japan, many Honda cars having a "stumble" until fully warm, and the 1800 platform having a rather inefficient head design, I fear it is a designed in necessity to pass so not seen as a concern to Honda and much like their car owners have discovered the only remedy is to fully warm it up.
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I dont have the years bikes that you guys are having the "stumble" issue with. But just trying to understand. That is not a stumble. That is seemingly hunting for idle. Then it takes off and over revs? Scary, but could be any number of things.
But when that happens, does the bike actually lose power? Or is it just "a surge?"
A video with possible solution. Bad alternator as solution.
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Originally posted by dxlnt1 View PostI dont have the years bikes that you guys are having the "stumble" issue with. But just trying to understand. That is not a stumble. That is seemingly hunting for idle. Then it takes off and over revs? Scary, but could be any number of things.
But when that happens, does the bike actually lose power? Or is it just "a surge?"
A video with possible solution. Bad alternator as solution.
The symptom described clearly by the op is usually called "hunting" rather than stumble. It occurs when engine rpm varies randomly above and below a given engine speed.
A "stumble" is normally felt during acceleration, usually at low speed, when acceleration is momentarily interrupted as the throttle is opened. It may be accompanied by a spit or sputter sound from the exhaust. Probably caused by an excessively lean fuel mixture that fails to combust.Harvey Barlow
Crosby County, TX
2010 Goldwing Level II Pearl Yellow (sold at 93,000 miles)
2014 Goldwing Level II Pearl Blue (sold at 27,000 miles to forum member)
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The early years of the 1800 had that same RPM jump at certain throttle position. My 2004 bike had that. At any engine temp. I was told by several folks that was where the EFI mapping was trying to switch from low speed to high speed mapping.
My 2013 has a "blubber" as the temp gauge needle hits the first small line. I can make the bike blubber every time the temp is at that mark. In gear, riding, it is very dangerous to hit this blubber spot as the bike will try to fall over if in a low speed turn. I've had this blubber happen coming out of a restaurant after eating. Fire the bike up. Let it run as we get our gear on. Ride across the parking lot and the bike blubbers like the old days with a carb on a car where the choke was still hanging closed some ( I'm a mechanic for decades) . The bike is not rich mixture, it is lean when it blubbers. I learned on early TBI engines when the fuel pressure was low, the engine blubbered like it was too rich, when the engine was actually lean. It was a learning curve for this old hotrodder - mechanic on the EFI stuff as the OEMs installed EFI on everything
Dang odd my Honda cars have never blubbered like this bike does. In fact I;ve never had an EFI vehicle blubber like this bike does. Sad programming, mistake, wrong sensor inputs, something. Honda has eff'd up this bike throttle response IMHO2013 Red Airbag 1800
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Originally posted by HBarlow View Post
I agree.
The symptom described clearly by the op is usually called "hunting" rather than stumble. It occurs when engine rpm varies randomly above and below a given engine speed.
A "stumble" is normally felt during acceleration, usually at low speed, when acceleration is momentarily interrupted as the throttle is opened. It may be accompanied by a spit or sputter sound from the exhaust. Probably caused by an excessively lean fuel mixture that fails to combust.
Originally posted by Tony in AZ View PostThe early years of the 1800 had that same RPM jump at certain throttle position. My 2004 bike had that. At any engine temp. I was told by several folks that was where the EFI mapping was trying to switch from low speed to high speed mapping.
My 2013 has a "blubber" as the temp gauge needle hits the first small line. I can make the bike blubber every time the temp is at that mark. In gear, riding, it is very dangerous to hit this blubber spot as the bike will try to fall over if in a low speed turn. I've had this blubber happen coming out of a restaurant after eating. Fire the bike up. Let it run as we get our gear on. Ride across the parking lot and the bike blubbers like the old days with a carb on a car where the choke was still hanging closed some ( I'm a mechanic for decades) . The bike is not rich mixture, it is lean when it blubbers. I learned on early TBI engines when the fuel pressure was low, the engine blubbered like it was too rich, when the engine was actually lean. It was a learning curve for this old hotrodder - mechanic on the EFI stuff as the OEMs installed EFI on everything
Dang odd my Honda cars have never blubbered like this bike does. In fact I;ve never had an EFI vehicle blubber like this bike does. Sad programming, mistake, wrong sensor inputs, something. Honda has eff'd up this bike throttle response IMHO
So has or will anyone try the alternator thingy? Especially if its consistent, persistent and reproducible! If the alternator is the issue, wouldnt that be mud in Honda's face? Im just curious.
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Originally posted by dxlnt1 View PostI dont have the years bikes that you guys are having the "stumble" issue with. But just trying to understand. That is not a stumble. That is seemingly hunting for idle. Then it takes off and over revs? Scary, but could be any number of things.
But when that happens, does the bike actually lose power? Or is it just "a surge?"
A video with possible solution. Bad alternator as solution.
The bike is actually losing power, and when I first experienced it, I thought the bike was going to die. It's not until you apply additional throttle that the bike takes the full input. e.g. You're trying to hold 1800 RPM's, the bike 'stumbles' to about 1300 RPM's, then you apply throttle to bring it to 3000 RPM's, and you suddently go from 1300 RPM's to 3000 RPM's.
I described it as a stumble because it's not like the normal 'hunting' I've seen where the RPM's fluctuate maybe 200-300 RPM's, and most notable at idle. That behavior I've seen on most of my vehicles.Costa Mesa, CA
2012 RED GL1800
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Originally posted by 530ktm View PostI was curious if you have taken this to the dealer for them to hear what it does and see what they have to say about this situation.Costa Mesa, CA
2012 RED GL1800
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Originally posted by glarson3 View Post
Just so it's clear, the throttle was attempting to hold steady at ~1800, and was dropping about 500, and going back to 1800. I'm not sure how the alternator could play into this, but the bike has been doing this since it was just a few weeks old, so if it's the alternator, it's been bad since week 2 of ownership, and hasn't 'failed' yet.
The bike is actually losing power, and when I first experienced it, I thought the bike was going to die. It's not until you apply additional throttle that the bike takes the full input. e.g. You're trying to hold 1800 RPM's, the bike 'stumbles' to about 1300 RPM's, then you apply throttle to bring it to 3000 RPM's, and you suddently go from 1300 RPM's to 3000 RPM's.
I described it as a stumble because it's not like the normal 'hunting' I've seen where the RPM's fluctuate maybe 200-300 RPM's, and most notable at idle. That behavior I've seen on most of my vehicles.
Remember the old cars with points and condensor? This problem was common after a tune up. You then adjust points gap and timing to correct.
Hope Im not offending anyone with my comments or questions.
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