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Discussion Starter · #1 ·
First my bike made it on a 1750 mile trip with no major issues. I'm very impressed with my gl1200. We went from the 90's to raining for days and 50-60 degrees. Back to the 105 plus and cruising at 85mphs. It averaged 50 mpg peaked at 55mpg.
Now before we left the bike started idling high when hot and the outside temp over 80. It would idle at 1500-1900 once the temps went over 80. Also when I went let off the gas to slow down the rpms would stick at 2500 plus and some time increase. but drop down soon enough. During the last part of the trip when hot and 100 outside the idle would be as high as 3000, it would be very hard to restart when hot and when slowing down the rpms would stay or increase to 3500 for long time.
My fuel pump went out completely the second day home from trip good timing. I since replaced it with an 1985 prelude model. It starts,idles and revs great but still has the same issues as before. What causes the rpms to stay high and or increase after you let off gas and what causes the idle to increase if the its hot out and the bike is warmed up?

Sorry for long post. Ron
 

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Discussion Starter · #6 ·
Well, if you were really getting 50~55 mpg, I'd say leave things the way they are. But...
...have you looked at the slides?
...have you done an idle drop and sync?
...have you looked for interference in the cable's operation?
. Mileage was confirmed by the two other bikes riding with us. Cable operations is good nothing is binding. Adjusted with some slack, haven't open the carbs ever. Sync them in April plan on doing it again soon. I have had these issues since I got it in Jan but they are getting worse.
 

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Discussion Starter · #8 ·
I should add the it only holds or raises the rpm once the motor gets over 2500-2700 below it won't do it?
 

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Discussion Starter · #12 ·
The cable has slack even when the rpm is high. If I turn it off during high rpm its hard to restart idles higher then normal and if you twist the throttle it races again.
 

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Discussion Starter · #13 ·
I honestly don't think its an issue with cable because I loosened it while it was racing didn't change anything
 

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Discussion Starter · #15 ·
Why only once the motor is warm and worse when the outside temps are hot? I'm lost as to what it is ?
 

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Discussion Starter · #17 ·
OK, let's try again. What do the slides look like?
Have you done and idle drop to see how that affects it?
While this is going on, is the idle adjust screw resting against the stop?
Honestly as soon as I have more then few minutes I'll open the caps and check the slides. I also want to sync it to. Yes the idle screw is bottomed out when the rpm is racing. Lower the idle does nothing while the rpms are racing.
I'm working 12 days straight 11-12 hour days. The bike is my only transportation right now and I need to use during work 3-4 days a week. Once I'm off I'll sync and look at slides.
 

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Discussion Starter · #20 ·
Sorry still haven't had the time to work on the slides or sync the carbs. I did drop the idle cold down to 700 rpm the bike barely runs. I will update more once I get time off of work. I just don't want you all thinking I'm brushing off your advice and time. Thanks Ron
 

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Discussion Starter · #21 ·
My bike was good an hot when I got home yesterday. It was 98 degrees outside and I just ran it hard. So I had just enough time to sync carbs. They were off but not that far, and I also adjusted them at 3000 rpms too. I took it for a short test run. It seem to help with the rpms rising but they still hang for a monument after throttle is released and it idles about 400-800 rpm after ran above 3000 rpm when hot. I did get the idle down to 600 and it ran not great but stayed running. I set the idle at 1000 now. I'll see what happens once I get it out for a longer ride.
 

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Discussion Starter · #22 ·
Update, I removed all 4 slides they all looked good couldn't find any damager to rubber, needles or slides. inside of carbs where slides go looked very clean. I still have the issue when its hot the idle increases from 1100 to 1800 when hot outside and bike is warmed up. RPMs hold at 2500 or more when throttle is released some times for seconds and other times for a lot longer. Now when the outside temp is below 65 and the bike is cold this never happens. Also re synced carbs helped a lot but I still have this issue? Also when the rpms are racing adding choke make then go higher. its the worse when I go to restart after riding and getting it nice and warm and the outside is above 65. Its hard to restart takes a lot of cranks and idle races very high once it starts some times around 3500rpm and other times about 2000 plus. Other wise the bike seems to running good. What else should I do or try.
When the idle is racing the idle screw is seated and it has no affect on lower rpm. The only thing that helps is to drag the motor has your slowing to a stop and then at last moment pull the clutch in. But even then the rpms will climb back up.
 
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