mid range carb problems


Information and questions on GL1100 Goldwings (1980-1983)
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h34race
Posts: 3
Joined: Wed May 06, 2015 5:51 pm
Location: bentonville AR. Benton
Motorcycle: 1980 honda GL 1100 I

mid range carb problems

Postby h34race » Tue May 19, 2015 6:05 pm



hello again I solved my coil issues now all plugs are firing,a coil rack from a 2006 hunydui elontra wires and all even had 3 wirers worked awsome,now iI have a midrange throttle problem feels like it's shutting of cyclenders bbucks and carrys on pops out the carb sometimes,Idle is ok reves fine from idle to 5000 doesn't buck or anythig starting out all is well till i get in the the mid range cruse then it falls flat, force past it and it screems to life.MY vacume advance diafram is blow and part of my stator is bad manaul lists as part of issue.I spent the money on the carbs they were rite used randakk info to the letter,just fustrated need ideas,fuel presure,CDI boxs,stator being almost bad,starter relay fryed,fuel pressure was my guess but it pulls hard NO popping when you grab a handfull of throttle???? any help is most welcome please, Bill J



Earl43P
Posts: 50
Joined: Sat Nov 01, 2014 7:15 pm
Location: Elizabeth City, NC
Motorcycle: 82 GL1100, parked in Pa.
93 GL1500 Interstate DD
99 Valkyrie IS

Re: mid range carb problems

Postby Earl43P » Thu May 21, 2015 11:22 am

Since you state that your vacuum advance is blown, PLUG the vacuum line that goes to it.

If you have a vacuum leak (open diaphragm) your carburetor slides performance suffers at steady state speeds.
Then when you grab that handful of throttle, the vacuum raises the slides and you are off to the races.

Just that simple.


I had a stumble at 60mph on my 1100. Roll on the throttle, good acceleration.
Try to go 60-65, felt like it was "missing".

I cleaned my slides/housings with aluminum foil balls and Seafoam, got all the blackish goo out and dried them thoroughly.
Problem solved.

I also quit putting 8oz. of ATF in each tank of gas and the problem has never recurred. Probably 20,000 miles ago.


(NOT a carb expert, Earl)
When all else fails, RTFM!

99 Valkyrie Interstate
82 GL1100 nekkid-ish
93 GL1500 Next!

User avatar
virgilmobile
Posts: 7646
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: mid range carb problems

Postby virgilmobile » Thu May 21, 2015 2:17 pm

Popping in the carbs,midrange problem.
Sounds to be a bit lean.
The carbs do not have diaphragms on the slides.There solid and tight fitting.Just a speck of dirt can make them stick.they must move butter smooth.
Use a mirror in the bottom of the plenum box and rap the throttle.Verify each slide bounces up and down smooth.All it takes is one slide sticking shut to drop 25% of the HP
Get to the valve adjustments when the engine is cold.Get them set exactly right.
The vacuum advance needs to work.Without it,the timing will never advance above 28* btdc.At 3600 rpm,one usually sees about 5" of vacuum on that line and timing advancing toward 36* btdc.It does make a bit of difference.
Check and gap the plugs.

Earl43P
Posts: 50
Joined: Sat Nov 01, 2014 7:15 pm
Location: Elizabeth City, NC
Motorcycle: 82 GL1100, parked in Pa.
93 GL1500 Interstate DD
99 Valkyrie IS

Re: mid range carb problems

Postby Earl43P » Thu May 21, 2015 3:59 pm

I agree that the advance makes a bit of difference, I purposely rode mine with it disabled to see if mine was working. It won't cause the problem he has though. I'll go so far as to say if you never had a working advance, you're not likely to know unless you have ridden a properly performing 1100 recently.

I believe either a sticking slide or the poor vacuum from the advancer leaking is the root of his problem.
When all else fails, RTFM!

99 Valkyrie Interstate
82 GL1100 nekkid-ish
93 GL1500 Next!

User avatar
virgilmobile
Posts: 7646
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: mid range carb problems

Postby virgilmobile » Thu May 21, 2015 4:13 pm

I've been deep into the vacuum advance system on the 1100.Plugging or leaving the hose open has absolutely no affect on the engine.The vacuum is not ported to the engine side of the carbs.There is no vacuum at a idle.Its a little "spray nozzle" fitting in toward the intake side.As air flows across it,a vacuum is developed.Theres one in each carb,not just #3.
Just speculating,I've never dyno tested but my "G" force increased 20%.with everything working.Just a little bigger smile.




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