Cant get my gl1100 to stay at idle


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chief771
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Cant get my gl1100 to stay at idle

Post by chief771 » Sat Apr 20, 2019 12:42 pm



Good afternoon folks! Happy Saturday! Before I get into the subject I want to thank Admin and the rest of the members for this fantastic website. I appreciate all of you!!!

Last fall I bought my gl1100 interstate as a non running project. I rebuilt the carbs, got them back on, adjusted the valve lash, then synced the carbs. When I have the bike running and warmed up, I set the idle to 1100 rpm and let it set and idle to get some run time on the engine. As the bike is running the idle fluctuates between 900 and 2500 and then settling into idling at about 2000 rpm. I adjust the idle to get it down to 1000 to 1100 and it usually goes back to the 2000 mark within 5 minutes or so. I also noticed the right side gets hotter then the left. Both get warm to the touch. The exhaust also comes out with a little more pressure on the right side.

Help! I am not sure if this could be a big issue or not. Any suggestions?


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tigercub
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Re: Cant get my gl1100 to stay at idle

Post by tigercub » Sat Apr 20, 2019 1:10 pm

what kit did you use to rebuild the carbs and did you replace any of the jets?

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Re: Cant get my gl1100 to stay at idle

Post by chief771 » Sat Apr 20, 2019 1:17 pm

I replaced all the jets except for the ones that are pressed in. I was told they are not removable. As far as the kits I dont recall. I know they were not from Randak.
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Re: Cant get my gl1100 to stay at idle

Post by OldguyGlen » Sat Apr 20, 2019 1:19 pm

Just guessing here. How did you sync the carbs? Assume you did it on the bench since the bike doesn't idle well. Have you messed with the sync adjusters since then? Not sure your answers will help me guess any better, but I suspect others might use that info to help. My guess is air leaks. Vacuum advance port? Gasket troubles at intake tubes / elbows? Although needle valve failures (could be intermittent) could alter bowl fuel levels or even overflow into the carb throats. Just ideas to start the "pondering" process.

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Re: Cant get my gl1100 to stay at idle

Post by OldguyGlen » Sat Apr 20, 2019 1:25 pm

Another guess... Are you sure the idle jet is in fact clear.. they are not easy to clean in place (although they did clear on my recent carb rebuild). If they didn't clear, then you probably had to crank up the idle setscrew way past normal to get it to idle off the main jets. One test might be to screw in/out on the idle screws, maybe one at a time. If the idle screw has no, or little effect, its jet is probably clogged.

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Re: Cant get my gl1100 to stay at idle

Post by tigercub » Thu Apr 25, 2019 6:10 am

Idle jets must be completely clear I'm told. I could not clear mine after two weeks of trying many concoctions and even some religious incantations...nothing would shift the restriction. I had success using a fresh drywall screw, large pry bar, and a wooden jig to "pop" the pressed in jets out. Once out, they were surprisingly easy to clear after a few hours soaking in carb cleaner. I cleared them with a hair of neut, otherwise known as a single strand of a wire brush.

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chief771
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Re: Cant get my gl1100 to stay at idle

Post by chief771 » Thu Apr 25, 2019 6:34 am

Thank you for the replies! My question is if you pull out the idle jets with a drywall screw, dont you have to replace the jets? I will be pulling my carbs again to check the idle jets and pull them. Wish me luck!
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Re: Cant get my gl1100 to stay at idle

Post by tigercub » Thu Apr 25, 2019 8:06 am

no need to replace the pressed in jets. The drywall screw does not enter or damage the tiny hole located down the jet far enough to be avoided. I used a FRESH screw for each "PULL". more info viewtopic.php?f=4&t=50360 :D

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Re: Cant get my gl1100 to stay at idle

Post by chief771 » Fri Apr 26, 2019 5:27 am

It is settled. Going to pull the carbs, again, and try to pull the slow speed or idle jets and clean them out. My 1100 runs great above 2500 rpm but under that it hesitates, and wont idle decent. Hoping this will solve the problem. I will probably set the floats too since I did not do that before. Wish me luck!
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Re: Cant get my gl1100 to stay at idle

Post by tigercub » Fri Apr 26, 2019 4:43 pm

hang in there and good luck! I should maybe mention that before trying to pull these jets out I boiled the carb so each was HOT, then I quickly sprayed some PB Blaster into the jet area and hoped that assisted the removal.
:mrgreen:

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Re: Cant get my gl1100 to stay at idle

Post by chief771 » Fri Apr 26, 2019 4:48 pm

I got those jets out! Everyone was plugged solid. It's a wonder how it ran as good as it did! I am hoping with that done it will run better. It certainly should. Thank you for your help! Glad I stepped out of my comfort zone and did this!
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Re: Cant get my gl1100 to stay at idle

Post by tigercub » Sat Apr 27, 2019 9:55 pm

good on you! what method did you use to remove them?

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Re: Cant get my gl1100 to stay at idle

Post by chief771 » Sat Apr 27, 2019 9:58 pm

After getting the jets out o figured I might as well give the carbs the once over. I thought I had the carbs really clean after I boiled them out. I was so wrong. I discovered several holes that were plugged including all of the idle jets and the holes for the mixture screws. I was astounded the 1100 ran as well as it did. Now I am being very careful to check every thing. Thank you again to everybody for the assistance!
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Re: Cant get my gl1100 to stay at idle

Post by chief771 » Sat Apr 27, 2019 10:02 pm

Btw tigercub, I used the drywall screw method with a pry bar and a block of wood. I messed up the ends some. Hoping they will still work. They pressed in fine and all of the openings are clear. I did find a source for new jets if I need them.
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Re: Cant get my gl1100 to stay at idle

Post by Bjornen1 » Sun Apr 28, 2019 2:22 am

The problem is the idle jets. Get them out of the carburetor and clean them, then the motorcycle will go smoothly and fine. Take a look at this:
viewtopic.php?f=4&t=50876

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Re: Cant get my gl1100 to stay at idle

Post by chief771 » Sun Apr 28, 2019 7:19 am

Bjorn1, thank you for sharing the link. I ended up turning a drywall screw into them then prying them out. They were a bugger to get out but I got them. I'm going to finish going through the carbs today and hope to get them back on.

I took some time to get the 4 caps and the down tubes to shine a little better. With several grades of sand paper and lots of elbow grease
. They look a lot better then they did!
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Re: Cant get my gl1100 to stay at idle

Post by chief771 » Sun Apr 28, 2019 7:36 am


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Re: Cant get my gl1100 to stay at idle

Post by chief771 » Sun Apr 28, 2019 7:38 am


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Re: Cant get my gl1100 to stay at idle

Post by chief771 » Sun Apr 28, 2019 7:41 am


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Re: Cant get my gl1100 to stay at idle

Post by chief771 » Sun Apr 28, 2019 7:43 am


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Re: Cant get my gl1100 to stay at idle

Post by chief771 » Sun Apr 28, 2019 2:47 pm

Ok well that was a bummer. Got the carbs back on and tried to start it. No joy. If I dump gas in the plenum it will run for a little while but once the gas is gone it kills. I checked the fuel pump. It is pumping gas into the carb and that is as far as it goes. I bench tested it and no leaks. No fuel to the carbs it seems. No start. What did I do wrong?
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Re: Cant get my gl1100 to stay at idle

Post by OldguyGlen » Sun Apr 28, 2019 3:07 pm

Back to basics. Can you keep it running above 2500 with throttle after starting with raw gas? That checks main jets ok. Does choke help? Look down plenum with a mirror to check accel pump. That verifies gas in bowl #3. Check bowl drains to see if all have gas. What settings on idle screws?

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Re: Cant get my gl1100 to stay at idle

Post by chief771 » Sun Apr 28, 2019 3:17 pm

I cant get it to run for more then a few seconds on raw gas. Screws are set at 1 an 1/2 turns out. Fuel bowls have some gas. Number 2 have more in it then the rest. I have the choke open all the way and it makes no difference. Should I open the screws more? It started with the touch of the starter before I "fixed" the low idle jets.
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Re: Cant get my gl1100 to stay at idle

Post by OldguyGlen » Sun Apr 28, 2019 4:52 pm

Just guessing now... Seems a mystery.
Did you put the floats in upside down. How do you know the fuel pump is delivering gas? Petcock turned on? Fuel lines or filter clogged?

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Re: Cant get my gl1100 to stay at idle

Post by chief771 » Sun Apr 28, 2019 5:48 pm

Floats are in right, I pulled the line off the carb coming from the fuel pump and it pumped gas like crazy. I pulled the spark plugs and it looks like the no. 1 cylinder is not firing. Fuel in all the bowls. #4 less then the others. It will start if I dump fuel in the plenum but wont stay running. I messed up something somewhere. Fuel filter is clean. I may just have to pull them out and find my mistake.


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