Very slow to return to idle

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Seb Astian
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Very slow to return to idle

#1

Post by Seb Astian »

My new (to me) Gl1000 is very slow to return to idle.
There's no change when adjusting the idle screw until I get to 3000 rpm. She'll then jump to 3000rpm and stay there. When take the idle screw back, she stays at 3000rpm for a while before suddenly dropping and cutting out.

I have put plenty of carb cleaner through it.

Any suggestions?
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jdvorchak
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Re: Very slow to return to idle

#2

Post by jdvorchak »

Hello and welcome to the forum. There is no shortcut to cleaning carbs. Running plenty of carb cleaner through them usually only results in clean float bowls but does little for the idle (pilot) jets and idle circuits.

But first things first. Make sure that your valves are adjusted to factory spec. Then make sure your ignition timing is spot on using the Randakk method of "Split Timing". Make sure your mechanical advance is working freely. Then and only then can you make the determination of whether to remove and clean the carbs.

Good luck and ask plenty of questions.
New users please visit our "Shop Talk" for common tips and help:
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Don't fix it 'til it's broke...
The person with the most toys wins!
If it has wheels or a skirt you can't afford it.
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71 CL350 with Bingham side car
2021 HD Triglide
2008 HD Dyna Low Rider
83 KZ1100L1 Son totaled it
83 KZ550LTD Shaft sold

Previous bikes: 84 GL1200 STD, 83 KZ550LTD, 83 CB1000, 78 CB400A, 82 CB900F, 79 CB750K, 2001 GL1800, 2000 Dyna Super Glide, 1972 CB350 K4, 1985 GL1200A, 1997 1200 Sportster, 84 GL1200I, 82 Honda CM400E, 81 Suzuki GS650L, 72 Triumph Bonneville 750, 72 Honda CB350, 66(?) Honda 305 Scrambler, 6? Yamaha yz250, 62 650 Matchless (Norton-Villers).
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RB
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Re: Very slow to return to idle

#3

Post by RB »

Choke cable and throttle carb routing..correct not pinched or kinked someplace?? Cables clean and lubed?? next might be sticking slides,
98 1500 SE..
99 1500 SE SOLD
97 SE 1500 SOLD
83 SOLD
82 REBUILT sold!!!
81 DAILY RIDER sold her :(((!
81 REBUILT SOLD!!!
81 REBUILT SOLD!!
80 REBUILT SOLD
79 IN BASKET PARTS FOR SALE
79 CLEANED UP AND SOLD
78 REBUILT SOLD
77 REBUILT SOLD
76 SOLD/PARTIAL REBUILD
76 REBUILT AND SOLD
75 REBUILT SOLD
75 REBUILT SOLD
75 REBUILD SOLD


FAIR WINDS,
RB
Seb Astian
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Re: Very slow to return to idle

#4

Post by Seb Astian »

jdvorchak wrote:Hello and welcome to the forum. There is no shortcut to cleaning carbs. Running plenty of carb cleaner through them usually only results in clean float bowls but does little for the idle (pilot) jets and idle circuits.

But first things first. Make sure that your valves are adjusted to factory spec. Then make sure your ignition timing is spot on using the Randakk method of "Split Timing". Make sure your mechanical advance is working freely. Then and only then can you make the determination of whether to remove and clean the carbs.

Good luck and ask plenty of questions.
Thanks, I'll check these things tomorrow. How do I know that the timing advance is working correctly, or what problems should I look out for?
Seb Astian
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Re: Very slow to return to idle

#5

Post by Seb Astian »

RB wrote:Choke cable and throttle carb routing..correct not pinched or kinked someplace?? Cables clean and lubed?? next might be sticking slides,
All cables are free. Throttle and choke lever on the carbs are returning to their off positions as they should.
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RB
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Re: Very slow to return to idle

#6

Post by RB »

Then I vote sticky slides. running some sea foam and/or some ATF with your gas fora tank or two may help..other wise carb rebuild/cleaning
98 1500 SE..
99 1500 SE SOLD
97 SE 1500 SOLD
83 SOLD
82 REBUILT sold!!!
81 DAILY RIDER sold her :(((!
81 REBUILT SOLD!!!
81 REBUILT SOLD!!
80 REBUILT SOLD
79 IN BASKET PARTS FOR SALE
79 CLEANED UP AND SOLD
78 REBUILT SOLD
77 REBUILT SOLD
76 SOLD/PARTIAL REBUILD
76 REBUILT AND SOLD
75 REBUILT SOLD
75 REBUILT SOLD
75 REBUILD SOLD


FAIR WINDS,
RB
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jdvorchak
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Re: Very slow to return to idle

#7

Post by jdvorchak »

Seb Astian wrote:
jdvorchak wrote:Hello and welcome to the forum. There is no shortcut to cleaning carbs. Running plenty of carb cleaner through them usually only results in clean float bowls but does little for the idle (pilot) jets and idle circuits.

But first things first. Make sure that your valves are adjusted to factory spec. Then make sure your ignition timing is spot on using the Randakk method of "Split Timing". Make sure your mechanical advance is working freely. Then and only then can you make the determination of whether to remove and clean the carbs.

Good luck and ask plenty of questions.
Thanks, I'll check these things tomorrow. How do I know that the timing advance is working correctly, or what problems should I look out for?
In the service manual , page 16-6, is the procedure. But it's not that complicated. Remove the point cover and grab the point cam and see if you can rotate it by hand. It will only go one direction and only move a few degrees but when you let go it should snap back. If it does you're good. Otherwise you have to pull the points plate and use some PB blaster on the moving parts to free them.
New users please visit our "Shop Talk" for common tips and help:
http://ngwclub.com/forum/page/ST


Don't fix it 'til it's broke...
The person with the most toys wins!
If it has wheels or a skirt you can't afford it.
Amateur Radio Station WW9L

71 CL350 with Bingham side car
2021 HD Triglide
2008 HD Dyna Low Rider
83 KZ1100L1 Son totaled it
83 KZ550LTD Shaft sold

Previous bikes: 84 GL1200 STD, 83 KZ550LTD, 83 CB1000, 78 CB400A, 82 CB900F, 79 CB750K, 2001 GL1800, 2000 Dyna Super Glide, 1972 CB350 K4, 1985 GL1200A, 1997 1200 Sportster, 84 GL1200I, 82 Honda CM400E, 81 Suzuki GS650L, 72 Triumph Bonneville 750, 72 Honda CB350, 66(?) Honda 305 Scrambler, 6? Yamaha yz250, 62 650 Matchless (Norton-Villers).
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Re: Very slow to return to idle

#8

Post by wajulia »

jdvorchak wrote:
But first things first. Make sure that your valves are adjusted to factory spec. Then make sure your ignition timing is spot on using the Randakk method of "Split Timing". Make sure your mechanical advance is working freely. Then and only then can you make the determination of whether to remove and clean the carbs.
.
I cant agree more, a sign that these bikes are not perfectly tuned is they hang in idle. First reaction is there is a mechanical hangup, but it is a much more complex interaction between timing and carb. There is some good stuff on this site that explains what is happening.

One additional thought -- after you assure the timing is correct, synch the carbs. Then after you are sure that everything is perfectly tuned -- there is something else wrong. My bet is the bike will run much better after you tune it.
2004 GL1800 Goldwing
2004 Honda Shadow ACE
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Sidecar Bob
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Re: Very slow to return to idle

#9

Post by Sidecar Bob »

wajulia wrote:after you assure the timing is correct, synch the carbs.
I was thinking exactly the same thing. Carbs that are out of synch will make the RPM drop slowly when you close the throttle.
Mr. Honda ('83 GL1100/Dnepr) summer How a motorcycle evolves thread
The Famous Eccles ('84 CX650EI/VeloUral) winter Never Ending Build (CX500forum)
Click: Colour schematics for all GL1000 & GL1100 and GL1200 standard models plus instructions on how to download the full size version
"A guy with two sidecars can't be all bad." - Cookie
Another guy with two sidecars..... Hmmmm... must be something to that....
Seb Astian
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Re: Very slow to return to idle

#10

Post by Seb Astian »

A quick update on this and another question.

It turned out that my GL1000 was fitted with GL1100 carbs and that the crankcase breather wasn't connected.

Instead of trying to get the GL1100 carbs to run, I have bought and fitted a refurbished set of the correct carbs for the bike.

I am struggling to find a schematic or photos and guidance of how the crank case breather was connected. Does anyone have a photo of theirs?
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RB
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Re: Very slow to return to idle

#11

Post by RB »

tube goes from the engine up to the air box..
98 1500 SE..
99 1500 SE SOLD
97 SE 1500 SOLD
83 SOLD
82 REBUILT sold!!!
81 DAILY RIDER sold her :(((!
81 REBUILT SOLD!!!
81 REBUILT SOLD!!
80 REBUILT SOLD
79 IN BASKET PARTS FOR SALE
79 CLEANED UP AND SOLD
78 REBUILT SOLD
77 REBUILT SOLD
76 SOLD/PARTIAL REBUILD
76 REBUILT AND SOLD
75 REBUILT SOLD
75 REBUILT SOLD
75 REBUILD SOLD


FAIR WINDS,
RB
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RB
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Re: Very slow to return to idle

#12

Post by RB »

tube goes from the engine up to the air box..the pipes it connects to on both ends look the same. Two different things. there was a "puke" bucket on teh drain tube but yoiu don't have to keep it..open line to teh ground or put a small filter on/in the line if you want.

look here

http://shop.westernhonda.com/fiche_sect ... fveh=13029
Last edited by RB on Thu Aug 09, 2018 10:04 am, edited 1 time in total.
98 1500 SE..
99 1500 SE SOLD
97 SE 1500 SOLD
83 SOLD
82 REBUILT sold!!!
81 DAILY RIDER sold her :(((!
81 REBUILT SOLD!!!
81 REBUILT SOLD!!
80 REBUILT SOLD
79 IN BASKET PARTS FOR SALE
79 CLEANED UP AND SOLD
78 REBUILT SOLD
77 REBUILT SOLD
76 SOLD/PARTIAL REBUILD
76 REBUILT AND SOLD
75 REBUILT SOLD
75 REBUILT SOLD
75 REBUILD SOLD


FAIR WINDS,
RB
Seb Astian
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Re: Very slow to return to idle

#13

Post by Seb Astian »

Sorry, I should have mentioned that this bike is a 1979. Was there not some sort of reservoir?

Can I run it without or will this effect the engine?
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Sidecar Bob
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Re: Very slow to return to idle

#14

Post by Sidecar Bob »

Some of them came with reservoirs of various designs but you have to empty them periodically. I find it easier to use a straight run of tubing and terminate it with a cheap fuel filter so that it self drains. I had that setup on my '79 engine for a long time and just set up the same thing for the '82 engine I just installed.
Mr. Honda ('83 GL1100/Dnepr) summer How a motorcycle evolves thread
The Famous Eccles ('84 CX650EI/VeloUral) winter Never Ending Build (CX500forum)
Click: Colour schematics for all GL1000 & GL1100 and GL1200 standard models plus instructions on how to download the full size version
"A guy with two sidecars can't be all bad." - Cookie
Another guy with two sidecars..... Hmmmm... must be something to that....
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Re: Very slow to return to idle

#15

Post by robin1731 »

Those guys covered your question about the breather. But I'll say the slow return to idle had nothing to do with using the 1100 carbs. Guys have run 1100 carbs for years on 1000's. A "supposed" upgrade. The problem was probably the carbs themselves. But not just the fact of using those carbs.
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