Bike run poorly when warm. Gl1100


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Dos.Honduros
Posts: 13
Joined: Sun Jun 02, 2019 11:47 pm
Location: Lakebay WA, pierce
Motorcycle: Gl1100 interstate

Bike run poorly when warm. Gl1100

Post by Dos.Honduros » Mon Jun 03, 2019 12:00 am



Hello, I could not find a posting that matched my issues. Please forgive me if I missed it.

My 1980 gl1100 starts and runs fine. It contiues to run fine until It warms up after about 20 mins. Once it’s warm it starts to miss/backfire and begins to idle high. Also when you turn the throttle it gets real erratic but will not gain rpms. It’s like it’s stuck at the high idle. Also when I turn the throttle it makes an odd whirring noise in the air box. It’s almost like the timing goes out of whack when I turn the throttle.

If I shut it off it and let it sit 20 minutes it will start and run fine for a while before doing the same thing again.
The difference I am seeing between my issues and similar issues is that mine is not dying.
Any help would be appreciated, thank you.



Dos.Honduros
Posts: 13
Joined: Sun Jun 02, 2019 11:47 pm
Location: Lakebay WA, pierce
Motorcycle: Gl1100 interstate

Re: Bike run poorly when warm. Gl1100

Post by Dos.Honduros » Mon Jun 03, 2019 12:35 am

Here is a video of what is happening after it warms up.




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virgilmobile
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Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
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Re: Bike run poorly when warm. Gl1100

Post by virgilmobile » Mon Jun 03, 2019 7:21 am

Cold runs and revs fine..Warmed up and it sputters when revved..
Seems to be firing on all 4.
I'd stick a mirror in the plenum box and have a look at the slides when it's acting up.
They may be sticking closed.

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virgilmobile
Posts: 8935
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Bike run poorly when warm. Gl1100

Post by virgilmobile » Mon Jun 03, 2019 7:52 am

Cold runs and revs fine..Warmed up and it sputters when revved..
Seems to be firing on all 4.
I'd stick a mirror in the plenum box and have a look at the slides when it's acting up.
They may be sticking closed.

Dos.Honduros
Posts: 13
Joined: Sun Jun 02, 2019 11:47 pm
Location: Lakebay WA, pierce
Motorcycle: Gl1100 interstate

Re: Bike run poorly when warm. Gl1100

Post by Dos.Honduros » Wed Jun 05, 2019 8:39 pm

ok update: thanks for the advice Virgil, looks like they are opening and closing fine.

heres a weird symptom I found:
I know it is an issue with electronics because the more accessories I turn on the better it runs. it will be idling poorly and will just sputter and not rev up under throttle. but if I turn on the radio it will run a little better but still poorly, then if I turn the CB radio on it will run a little better yet but not perfect.
so I'm guessing a voltage regulator? anybody else have any ideas? does anybody have any expertise in gl11000 voltage regulators?

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virgilmobile
Posts: 8935
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Bike run poorly when warm. Gl1100

Post by virgilmobile » Wed Jun 05, 2019 10:32 pm

Strange...Can you measure the battery volts when it's running bad?
Expect it to be between 12.3 and 14.2 volts.

Dos.Honduros
Posts: 13
Joined: Sun Jun 02, 2019 11:47 pm
Location: Lakebay WA, pierce
Motorcycle: Gl1100 interstate

Re: Bike run poorly when warm. Gl1100

Post by Dos.Honduros » Wed Jun 05, 2019 11:15 pm

Nevermind I figured it out. It was the master link.

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virgilmobile
Posts: 8935
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Bike run poorly when warm. Gl1100

Post by virgilmobile » Thu Jun 06, 2019 5:16 am

A electrical problem..Great job finding it.



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