running rough....


Information and questions on GL1100 Goldwings (1980-1983)
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cbach1981
Posts: 154
Joined: Sun Mar 14, 2010 9:03 pm
Location: Salem, ME
Motorcycle: 1983 GL1100I Interstate

running rough....

Postby cbach1981 » Fri Apr 08, 2011 5:49 pm



Ok, here's a question for you guys. My 83 1100 runs very rough throughout the entire throttle range, almost like it's missing on one cylinder. occassionally, it'll smooth out and haul ass if you rip it open quickly. carbs are sync'd and just cleaned. think I may have an air cut-off that isn't seated or working properly? Replaced them last season and they still look good, but I'm wondering if I might have had one misaligned and not known it as i put the cover on. Thoughts please....


    You only need two tools in life - wd-40 and duct tape. If it doesn't move and should, use the wd-40. If it shouldn't move and does, use the duct tape!

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virgilmobile
Posts: 7650
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Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
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81 GL1100
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83 GL1100 I
83 GL1100 standard
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Re: running rough....

Postby virgilmobile » Fri Apr 08, 2011 9:04 pm

First do this quick test.With the engine cold,start it and run about 1500 rpm for 10 seconds.Shut down and carefully tap each exhaust header (they will be quite warm).Any exhaust that is cold is a dead cylinder.A nonfiring cylinder that sometimes runs great is an indication of a ignition arcing out of the plug cap (remove the rubber bootie to watch when dark)or ethanol gas crud in the bowls(it came out to the tank).Drain the bowls while tapping on them.look at what comes out.The purpose to the air cutoff valve is to increase the fuel mixture during rapid decelleration to prevent an over lean mixture and popping.

cbach1981
Posts: 154
Joined: Sun Mar 14, 2010 9:03 pm
Location: Salem, ME
Motorcycle: 1983 GL1100I Interstate

Re: running rough....

Postby cbach1981 » Fri Apr 08, 2011 9:25 pm

Virgil, I have done the header test, both by feeling it, and by spraying with water. By feel, they all burn. but water wise, number 3 seems colder than the others, i.e. water stays on pipe considerably longer than on others but does eventually burn off. as far as the fuel, I filled the tank at the end of the season, added seafoam. problem is, I had the carbs off most of the winter, and didn't know that my petcock does not seal as well as it should, so lost a good quarter of a tank thru leakage from the fuel line. draining seems to show clean fuel from bowls. Caps and wires and plugs all brand new mid summer last year. will still check for possible defective cap tomorrow night. 4 year old just fell asleep an hour ago and momma will be mucho pissed if I wake the kid up playing around out in the garage, lol.
    You only need two tools in life - wd-40 and duct tape. If it doesn't move and should, use the wd-40. If it shouldn't move and does, use the duct tape!

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littlebeaver
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Motorcycle: 1981 gl 1100 I , 79 Yamaha XS11
Special, 82 Kawa 750 CSR, 82 Kawa 750 LTD, 03 Kawa Nomad 1500, 99 Kawa Voyager 1200

Re: running rough....

Postby littlebeaver » Fri Apr 08, 2011 11:39 pm

You may want to check the plug from the pulse generator and maybe the spark units too, check the ohm's as suggested in the manual, have you cleaned up your mechanical advance yet, mine was terrible..Rust and just a mess..Wingman suggested using brake cleaner to clean it up, I used it and it works really well..I also found a electrial wire from that plug was damaged , testing the ohms paid off because that's how I found that problem.. I tested the vacuum advance and it failed so I replaced it.. Good luck..Thanks again for the manual..

cbach1981
Posts: 154
Joined: Sun Mar 14, 2010 9:03 pm
Location: Salem, ME
Motorcycle: 1983 GL1100I Interstate

Re: running rough....

Postby cbach1981 » Sat Apr 09, 2011 8:35 pm

ok, tonights update. checked for arcing in wires and caps: no problems. Checked electrical connectors for most anything I could get to and found no issues. pulse generater and spark units test good according to the manual. also pulled fuel filter and saw that it's not as clean as could be so I'm buying a new one in the morning and replacing fuel lines at the same time. still have a rough run like one cylinder is dead 95% of the time. only wakes up when I give it the right amount of throttle, but then seems to die again after only a second or two. I'm thinking it's time to pull the carbs again and see if some crud slipped by me. seems like one cylinder starves for fuel, or maybe even to rich. might recheck floats while I'm in there...
    You only need two tools in life - wd-40 and duct tape. If it doesn't move and should, use the wd-40. If it shouldn't move and does, use the duct tape!

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cpawilly
Posts: 53
Joined: Sun Mar 06, 2011 1:50 pm
Location: Martinsburg, WV
Motorcycle: 1984 Interstate

Re: running rough....

Postby cpawilly » Sun Apr 10, 2011 1:22 am

Maybe a vacum leak on one cyl

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virgilmobile
Posts: 7650
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Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
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82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: running rough....

Postby virgilmobile » Sun Apr 10, 2011 8:20 pm

If the compression is within 4psi of each other and a good spark,the only thing left is fuel mixture (carb plugged leak or vacuum leak).Compair the plug tips.They are a good tell to firing condition,eg: sooty,perfectly clean,light tan,etc.

cbach1981
Posts: 154
Joined: Sun Mar 14, 2010 9:03 pm
Location: Salem, ME
Motorcycle: 1983 GL1100I Interstate

Re: running rough....

Postby cbach1981 » Sun Apr 10, 2011 8:53 pm

virgil, the plugs are perfect on 1, 2, and 4. Number 3 has a coating of black carbon on it. not much, but definately different than the others. Been doing some research and have had a few looks at similar problems. seem to point towards possible mixture screw adjustment issue. they may have been over adjusted to compensate for another issue at some point in it's past life. trying now to find a good deal on a new set of screws and will try replacing them if I can. one currently has the limiter cap broke off, so I'm thinking someone has messed with them before.
    You only need two tools in life - wd-40 and duct tape. If it doesn't move and should, use the wd-40. If it shouldn't move and does, use the duct tape!

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virgilmobile
Posts: 7650
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: running rough....

Postby virgilmobile » Mon Apr 11, 2011 3:03 pm

Being sooted up indicates more gas than the cylinder can burn completely(over-rich).Your thought about the idle mixture may be right if the carb is pulling the same vacuum and the compression is equal to the rest.Don't dismiss a low compression on one cylinder either.Do the basic testing.Compression :4-5 psi max difference,idle jet turned out the same for all cylinders(as a starting point),vacuum sync all the carbs.The vacuum amount is not as important as equality. Don't worry about the limiter cap,I broke mine off on purpose so I could clean the port.I don't remember the starting point.Either 1.75 or 3 turns.Something like that.

imfree
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Motorcycle: 1982 GL1100I

Re: running rough....

Postby imfree » Tue Apr 12, 2011 8:11 am

Check your floats,The frist time I did mine I did all four then put the covers on ,I had the same problem that you have.So I recheck the floats and sure enough number three was to high,I found that when I was adjusting #1 my fat arm was changing #3,So set one put the bowl on then do the next one.

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virgilmobile
Posts: 7650
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: running rough....

Postby virgilmobile » Tue Apr 12, 2011 11:43 am

Yes,fuel level equality is important.On my 1000 carbs,I ran the motor,then captured the gas from the drain plug one at a time and measured the amount.It was a easy way to verify float cutoff and fuel amount.It did solve a lean 1 cylinder problem.

cbach1981
Posts: 154
Joined: Sun Mar 14, 2010 9:03 pm
Location: Salem, ME
Motorcycle: 1983 GL1100I Interstate

Re: running rough....

Postby cbach1981 » Tue Apr 12, 2011 7:02 pm

Carbs are off now and being rechecked. Will post my findings when I get it back together
    You only need two tools in life - wd-40 and duct tape. If it doesn't move and should, use the wd-40. If it shouldn't move and does, use the duct tape!

User avatar
virgilmobile
Posts: 7650
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: running rough....

Postby virgilmobile » Wed Apr 13, 2011 11:04 am

Float level is measured with the carb vertical and the float resting on the needle valve,not compressing the spring.

cbach1981
Posts: 154
Joined: Sun Mar 14, 2010 9:03 pm
Location: Salem, ME
Motorcycle: 1983 GL1100I Interstate

Re: running rough....

Postby cbach1981 » Sat Apr 23, 2011 7:10 pm

Been a while, wife had our second child on 4/14 so I've been a bit preoccupied, but heres my update. Got the carbs out, checked floats all are good. recorded pilot screw settings, pulled them and cleaned again. got it all together and still rich on #3. was pulling limiter caps to start new on pilot adjustments, and broke the top of the screw on #3 right off! so, ordered new today, will have to wait till they get here later in the week and see what I can do. Plan on trying to make an adjustment tool similar to one I saw here on another post. looks easy enough to build. Will keep you informed....


    You only need two tools in life - wd-40 and duct tape. If it doesn't move and should, use the wd-40. If it shouldn't move and does, use the duct tape!


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