1978 GS 1000 problem

[Anonymous]

bike revs up, will not idle down

carbs are stock and clean

new manifolds

please help

[Anonymous]

When did this start, and what had you done prior? A few things come to mind: A vacuum leak at the manifolds, the idle speed adjustment at the bottom of the carb bank, a sticking cable, a stuck choke.

Tim

[Anonymous]

wow that was fast thanks

bike sat for a couple of months - started doing this before - thats when I replaced the manifolds

not cable - carbs fully closed

not chokes - manual lever pushes them closed

I can set the idle speed fine


would carb synch effect ???

[Anonymous]

Hi Harry welcome to the forum.

Does your throttle move freely? or do you have to manually move it back?

[Anonymous]

Are you saying that with the carbs fully closed that it still doesn't idle down?

Also have you check to make sure your choke is actually closing? A week or loose cable there will leave the choke open although you have pushed then lever closed.

[Anonymous]

throttle has open and close cables - plus springs back closed with a good "pop"

chokes are not cable operated - one lever opens and closes all 4 at one time

[Anonymous]

This is almost certainly an air or mixture leak downstream of the throttle slides.

Have you checked all 4 carb sync port blanking screws are still there?
Have you checked all 4 carbs still have all their pilot air screws, and are they set correctly?
Do all 4 manifolds have the o-ring fitted correctly?
Are the carbs seated properly in the manifolds?

[Anonymous]

thanks - now I have some things to check

does anyone know the correct settings for ALL the screws

my manual says - do not touch - one of the screws ( on bottom ? ), so I have no idea what the setting is or what the screw does.

[Anonymous]

Screws on sides -- 1 1/4 turns out (factory setting with airbox and stock exhaust)

Screws on bottom -- 1 5/8 turns out APPROX. Factorys set but generally 1 5/8 will work OK as a default. Yellow paint should indicate correct setting.