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1979 GS1000 idles fine but races when the throttle is twisted

dubwicht

dubwicht

Forum Apprentice
I got the bike idling nicely today but when I twist the throttle it races and will not settle down. I can only reduce the idle by turning out the throttle screw but of course that closes the sliders and cannot start the bike without turning it back up. I slackened both sides of the throttle cable but it doesn't make a difference. I can hear the sliders hit top and then bottom when I twist the throttle.
 
Did you remove the intake boots and flex them, checking for cracks? Did you replace the O-rings behind the intake boots? Vacuum sync the carbs?
 
I purchased new boots and they included new o-rings. I did a bench sync but haven'd done a vacuum sync yet. One thing I did notice is that the clamps for the air box boots are tightened right up and air may be leaking there. I will buy and install new clamps. I am also looking at the cables - there isn't enough free play. However, the cables are not getting hung up and the slides are dropping to the bottom.
 
dubwicht said:
I purchased new boots and they included new o-rings. I did a bench sync but haven'd done a vacuum sync yet. One thing I did notice is that the clamps for the air box boots are tightened right up and air may be leaking there. I will buy and install new clamps. I am also looking at the cables - there isn't enough free play. However, the cables are not getting hung up and the slides are dropping to the bottom.
Click to expand...

Carbs can be bench synced absolutely fine, but the engine can run like a sack of sadness until the vac gauges are on it.
Rule of thumb - if you ever disturb the carbs, put the gauges on them.
There are idiots out there who will tell you it's not necessary. Ignore them, they are braying asses.
 
Most likely an air leak somewhere still... I've never have a sync have that much effect if they've been bench synced. :)
 
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