.png "Powered by vBulletin")
I will try to make this long story as short as possible without leaving out important info. '81 GS1100e. I have put about 3000 miles on it, has always had minor fueling issues but it would idle and run OK, a bit rich at full throttle and crappy (30-35) mileage. Problem started when I violated the "Change one thing at a time" rule. List of changes:
Removed 4-1 and put stock exhaust back on with new gaskets.
Removed K&N filter and drilled airbox cover, replaced with stock.
Adjusted valves.
Changed plugs, replaced caps with correct NGK.
Set static and dynamic timing (Dyna S with 3 ohm dyna coils).
Cleaned carbs properly, dip & ultrasonic, o-rings, replaced 115 jets with correct for '81 107.5.
Verified proper and clean pilot and air corrector jets, float levels, bench and carbtune sync perfect at 2500.
Problem:
Starts OK, come off choke and idles OK until it warms up. The hotter it gets the more hangy the idle gets. It will idle at 2200 all day and run fine from 2000-9500RPM. The idle will eventually settle down and keep going down until it stalls. When it stalls it starts right back up, but stutters and misfires until 2000 again. The hotter it gets (96 today) the more it stalls, maybe I have just not noticed before as it hasn't been this hot. I have had the carbs off 3 times. Finally put a set of carbs off a perfectly running '83. Started and idled OK, by the end of a 20 mile ride exactly the same symptoms. Have also tried running on prime. I am running in circles here, need some fresh ideas. The more I work on it, the worse it gets.
Already checked: Everything. Well, obviously not and maybe I am overthinking this. but it is not a common problem or maybe I am screwing up the same thing over and over. Things I am going to try next: Put K&N back in, check around coils after dark for arcing. Any other ideas? I was thinking Dyna module, but timing mark is steady and fires all plugs with timing light attached. When it stalls it sounds like the motor is trying to turn backwards as it dies and it blows the #4 hose off the carbtune as the vacuum goes to 0. Runs WAY too good to be cam timing. Carb boots look OK but I am going to swap them, airbox boots OK as well although one is missing the metal ring that secures it. Too hot to work on it again until morning, hopefully I will have some fresh ideas....
Removed 4-1 and put stock exhaust back on with new gaskets.
Removed K&N filter and drilled airbox cover, replaced with stock.
Adjusted valves.
Changed plugs, replaced caps with correct NGK.
Set static and dynamic timing (Dyna S with 3 ohm dyna coils).
Cleaned carbs properly, dip & ultrasonic, o-rings, replaced 115 jets with correct for '81 107.5.
Verified proper and clean pilot and air corrector jets, float levels, bench and carbtune sync perfect at 2500.
Problem:
Starts OK, come off choke and idles OK until it warms up. The hotter it gets the more hangy the idle gets. It will idle at 2200 all day and run fine from 2000-9500RPM. The idle will eventually settle down and keep going down until it stalls. When it stalls it starts right back up, but stutters and misfires until 2000 again. The hotter it gets (96 today) the more it stalls, maybe I have just not noticed before as it hasn't been this hot. I have had the carbs off 3 times. Finally put a set of carbs off a perfectly running '83. Started and idled OK, by the end of a 20 mile ride exactly the same symptoms. Have also tried running on prime. I am running in circles here, need some fresh ideas. The more I work on it, the worse it gets.
Already checked: Everything. Well, obviously not and maybe I am overthinking this. but it is not a common problem or maybe I am screwing up the same thing over and over. Things I am going to try next: Put K&N back in, check around coils after dark for arcing. Any other ideas? I was thinking Dyna module, but timing mark is steady and fires all plugs with timing light attached. When it stalls it sounds like the motor is trying to turn backwards as it dies and it blows the #4 hose off the carbtune as the vacuum goes to 0. Runs WAY too good to be cam timing. Carb boots look OK but I am going to swap them, airbox boots OK as well although one is missing the metal ring that secures it. Too hot to work on it again until morning, hopefully I will have some fresh ideas....
Comment