1979 gs850g. bike has an intermittent "coughing"

[Guest]

Hello Gs forum!

Well, I'll go straight to the point....kinda.
My bike developed an issue after stop and go traffic for some time. while stopped at a light, revs will go up and won't go to normal till I start moving. Also, had to give a slight throttle while stopped to keep the bike from dying (not too much, just a slight touch).

I read on bikecliff's website that it could be an air leak, probably the air intake o'rings. So I ordered 4 and replaced them today. Also, a clamp from one of my air box boots where missing and the boot was slightly off, so I fixed that buying a new clamp. Also sealed the air box with wheaterstrip as recommended on the airbox tutorial.

Now, the bike starts really nice, but it has this "coughing", only coming from the right muffler. I can rev it up with no problem, but it will keep doing this intermittent coughing after when it's idling. I want to mention that I took the carbs out, but didn't open them to avoid syncing them... am I right or should I re-sync them?

I want to go on a ride, but I don't know if it's safe

Also, My throttle won't come back once released, I have to move it up myself... is it too tight or what did I do wrong?

Thanks!!

Nico

[tom203]

As to coughing at idle stuff.... Do you have a vacuum operated petcock still? Connected to carb #3 intake ? (Carb #1 is the one on left under clutch hand lever)
get new suzuki throttle cables- yours are probably worn out

[chuck hahn]

Probably routed the cable wrong..assuming it would return ok before.

As for the cough. If its on the right side it gonna be carb 3 or 4. Put your hand on top of the carbs with the bike running off a gravity aux feed. When it coughs youll feel it in the carb that the cylinder is acting up on.

Once youve IDd the cylinder, check the plug wire to the cap conection. trim it back about 1/4 inch and rescrew the cap on. If that fixes it it was a bad wire connection.


If it still couchs it gonna be a lean or a rich condition. So turn the mixture screw on that carb in 1/4 turn and see if the couching increases in repeatability. If it does then you go out to the original 1/4 you just went in... and then another 1/4 to richen the cylinder. By mixture screw I mean the side ones.

[Phred]

Time for new throttle cable or cables. Likely one of the wires has let go from the end. Change it sooner rather than later. I was three blocks from home when mine snapped. Glad I wasn't 300 miles.