Im stuck !

[Guest]

I havent been around in a bit because I just had to stop working on the bike. I was ready to give up and needed a breather. Here is where I am.
The bike was running fine and I took it out for a 55 mile ride and then the next day with the wife for another 45. I decided to put in new plugs and I gapped them at .31 as per dynatek and next day the bike wouldnt idle. I messed with the pilot screws and made things worse and walked away.

Today I took out the pilot screws and fished out the gasket and washer and reinstalled. I checked for loose clamps and tightened all the spring clamps. I didn't have my airbox attached to the frame and I did that today thinking maybe after the 90 something miles the boots had loosened. I regaped the plugs to .27.

I checked for leaks with starter fluid. It starts and idles but it hangs and then drops and I am at a complete lose.

I posted a video so you can hear it and perhaps give some advice. I am stuck!!

Here is what I have done to the bike since getting it
New Stator and regulator
New Battery
Fresh oil
New dyna ignition
new dyna coils 3 ohm
new plugs
Sync carbs with carbtune
new throttle cable
New air filter
checked valve clearence
Dipped carbs twice and replaced all jets
Cleaned and lined tank
Right now it has a bottle of sea foam in the tank put in at last fill up
All my rubbers look new and are pliable.

Should I look at timing?? When I give a little goose to the throttle it goes up to 3500 hangs a minute and then climbs back down to idle.

https://youtu.be/EH0zSPJ1qTw

[bikemtn]

I did not notice that you synced you carbs. I think a good vacuum sync will help.

[hampshirehog]

Have you blocked off the vacuum nipple?

Plus did you completely strip your carbs when you cleaned them?

[Boriqua]

Opps I forgot to include it in the list. I did sync with a morgan. I have done it twice and am damn close to spot on but if anyone thinks that may be the culprit I will have at it again.

I have a plug in the petcock vacuum line and am running the tank on prime. I stripped the carbs down to the itty bitties but I didnt poke the first time as suggested so about 4 weeks ago I took them completely apart again and soaked 24 hours for each carb and poked with wire. When I put it back is when it was running awesome.
Alex

[BigD_83]

IMO, it's acting more like a mechanical problem with the throttle than an air leak.


A complete bottle of seafoam seems like a lot for the volume of your tank. Run it through and see if it gets better

[chuck hahn]

Seafoam is schittz compared to Berrymans B12 Chemtool Fuel System Cleaner.

https://www.walmart.com/ip/Berryman-2616-B-12-Chemtool-Total-Fuel-System-Clean-Up-15-oz/49678964?wmlspartner=wlpa&selectedSellerId=5227&adid=22222222227037175737&wl0=&wl1=g&wl2=c&wl3=58888395338&wl4=pla-91849141778&wl5=9026224&wl6=&wl7=&wl8=&wl9=pla&wl10=113836495&wl11=online&wl12=49678964&wl13=&veh=sem

[GS1000S]

I'm assuming you gapped the plugs to .027" and not .27"? Sounds like it's running under water in the video. I'd guess a carb. problem of some sort. How is the compression, and does it have a good spark on all cylinders?

[David]

you said that the bike was running well and then you adjusted the plug gaps and then it didn't run well. Am I missing something? Problem started with the plug adjustment! A bit obvious?

[Boriqua]

Yes david you are missing where I mentioned I reset the plug gaps bcak to .027. Yet I am still getting the hanging up. Guess I will just put it back together and give it a spin and see what happens.

[Boriqua]

So I am back to answer my own question so it may help someone else out. I have 100 miles on the clock since putting it back together and it is better than it ever has been. So here is the sad twisty stupid story. Yes the air box boots were not tightened sufficiently and that is what got me screwed up in the first place. I did not have the airbox secured to the frame and with the boots loose I guess riding it just wiggled them enough to let air in. I have since secured the airbox. The holes dont line up so I am not sure what the deal is there but some nylon spacers and its good.

But here is the interesting sad part. Before I discovered the issue with the airbox I went and tried desperately to adjust the carbs at the mixture screws. The mixture screws are smooth as hell with a point and there is a spring, a metal washer and a rubber gasket. I marked on the carbs where lightly seated was but after turning them out 3 - 3 1/2 turns The rubber washer must have slipped off the shaft because when I tried to seat them again they would not get to my mark. Sure enough when I pulled all the screws completely out 2 screws came out as assemblies and 2 left the spring, washer and gasket in the hole. So .. in essence the washer was obscuring the hole and would never have allowed me to get the carbs adjusted.

I was careful on reassembly to slowly back them out to 2.5 turns as the starting point and then just go slowly up from there. Bike is running like new.

[BigD_83]

Thanks for following up. I hate dead end threads as they don't help anyone out.

Did you previously replace those o-rings? If not, might be a good time to think about doing so; they might look new, but for $0.10, it's peace of mind.

[Boriqua]

Thanks for following up. I hate dead end threads as they don't help anyone out.

Did you previously replace those o-rings? If not, might be a good time to think about doing so; they might look new, but for $0.10, it's peace of mind.

I replaced them when I rebuilt the carbs but I have another new set. The bike is running nicely and I am having fun riding it so I am not going to mess with it now but when I do my fall/winter oil change I think I will replace them and the rubber at the enricher plungers. Those I didnt change and its just buggin me that they are the only ones left on there that are old.

[kaufen]

Sounds like it's running under water in the video.

[1948man]

The holes dont line up so I am not sure what the deal is there but some nylon spacers and its good.

Not sure what this means. If, by chance, it has anything to with carb boots and the intake pipes (that mount to the head), the intake pipes can be mounted upside down, causing things to not line up.

[Boriqua]

Not sure what this means. If, by chance, it has anything to with carb boots and the intake pipes (that mount to the head), the intake pipes can be mounted upside down, causing things to not line up.

you may very well be right. My '83 doesnt have the gaskets from the carbs to the motor. They are just boots and they are in excellent shape. The text on all of them is pointing up and it seems right. However .. the carb to airbox side makes the airbox lower than the frame mounts and there is no way to line them up.
They are Substantially lower. In order to compensate I installed 1/2" nylon spacers between the frame mounts and airbox mounts. Because the frame mounting holes are on an angle the 1/2 inch spacers lower the airbox enough and at the right angle to make the airbox intake side fit perfectly aligned with the carbs as they fit on the motor side.

There have been a couple of owners before me. Someone either installed the wrong carb to motor boots and the angle is now wrong, installed them incorrectly and the angle is wrong or installed an airbox off of a GS that wasnt cut out for my 750 and doesnt match up. I have half a mind to order new carb to motor mount boots but my fix seems to work except for the fact that it is VERY difficult to get to the idle knob and I burned the hell out of my hand trying to adjust it because I have to squeeze my hand in there to adjust between the starter cover and the airbox and I DO NOT have large hands. I am figuring it wasnt designed that way so the motor mount boots may not be correct but I cant swear and my last GS was owned in '83 and I just dont remember messing with the idle screw.

I kind of think the carb boots to motor side can be rotated so that it makes more sense on the airbox side .. but I am afraid at this point to mess with it since its running.