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i have an 85 gl 1200 interstate with 62000 miles and having some confusing problems which i hope someone has some ideas where to go next.

3 months ago was starting to have problems with choke,when fully choked would increase idle to about 3000 rpm, then it started to increase less and less to about 200 rpm increase then cable broke, thought that was the problem, replaced cable and still had same problems as before.

The main problems are when started without choke will idle at 200-300 rpm when choke on smells really rich but wont increase idle. when it gets to operating temp idle set at 1000-1100 rpm all is good.( i wish) when taken on a 15-20 min run on the interstate idle increases to 1800-2000 rpm lower idle back to 1000-1100 rpm and drive in city idle drops to 500-700 rpm, rest to 1000-1100 rpm let cool, restart without choke will idle at 200-300 rpm sometimes choke on will increase to 500rpm.



Things that i have done are:

i will always run 2-4 oz of seafoam in every other tank of gas, i quit putting it in for 5 fill ups, made no difference.

Removed carbs cleaned, no difference, replaced air filter, fuel filter,fuel lines, vacuum lines, then did a sync no help same problems.

Removed carbs again rebuilt with kits from randaks, resynced, no difference

Replaced manifold "O" rings, slow air cutoff checked slides and diaphragms, removed and cleaned chokes on carb, resynced no difference.

Removed carbs boiled in distilled water let soak in carb cleaner rechecked slides and diaphragms checked all the little ports in carbs, jets, floats, changed spark plugs, resynced, stripped all screws had to rethread and install new screws, still same thing.:X:X

I am hoping that somebody might have a place to goto next
 

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Is there any chance that the choke cable at the carbs is mis-adjusted?

The carb-end-of-the-choke has a metal end on it… and it's supposed to fit in the clamp. I've seen some bikes that had the black cable part in the clamp and that would cause the problem you are describing. Simply loosen the screw on the clamp and pull the cable back so the metal 'tang' is centered in the clamp…. then tighten the screw.

It'd be great if it's this simple.
 

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would be great if it was that simple, but metal end of cable is in clamp, have tried it with sheath in clamp, no change then tried to adjust cable at handle bars, have movement on carbs but adjustment has no effects.

thanks for the input
 

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Make sure the enrichening valves (chokes) are in fact returning all the way in when the choke is released. If the linkage between the carbs is binding somewhere it may be holding them slightly open so you are trying to adjust the carbs with the choke slightly on.
 

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just went out and checked the enriching valves and are returning as far as they will go in the little notch starts to go in the rubber wiper and when on they come out about 3/16th of an inch when choke is fully on. I have just been using throttle lock until i can get this fiqured out.

thank you for the suggestionand all the help everyone has been giving
 

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1987 GL1200 Interstate
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Could there be an air leak somewhere, causing the bike to run lean, therefore making the choke less effective?

Might that also explain the higher RPM after a freeway run when things warm up and expand a little?

I'm just tossin' things out there since you seem to have covered all the bases already.

When you roll off the throttle for a shift, does the motor seem to rev, rather than slow?
 

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Since you have been through the carbs multiple times I would suggest possible cracked coils or bad plug wires.
 

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Discussion Starter #9
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have went all around engine, air cleaner housing with an unlite propane torch, and starting fluid, makes no changes. when releasing throttle it doesnt rev up it starts to drop as soon as released. once it gets goining with either high or low rpm it still runs great, gas mileage hasnt changed still at 45 mpg at 70mph.

plumturn, have replaced with with a known good set oc coils wires and caps and doesnt change in any way.

i am begining to think it doesnt like to sit and wants to go.

thanks all for the help
 

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I believe i have found out what the problem was, as i was sitting looking to see what i should do next, i happened to look at the throttle cables and noticed the locknut was not tight agaisnt adjustment screw,so i started the bike and screwed adjustment into nut, and it died so i then restarted, with adjustment nut unscrewed it and idle started to raise, put on choke and idle increased a whole lot more,let it warm to operating temp, and adjusted idle with throttle cable to 1000 rpm,then locked it down, took it for a quick 20 min ride and idle stayed right at 1000 rpm, throttle is a lot more responsive. will go try the choke and check idle once it has cooled down a little.

i thought it would be a simple thing after doing all that extra work:X

thanks to everyone for all the info, but i did get to "know" my bike very well
 

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1987 GL1200 Interstate
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So, you rebuilt the carbs, twice, to try and fix a loose throttle cable? Damn, you and I could be twins.
 
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