Throttle Stop Screw Adjustment Help

[rjoyce]

Carburetion Question:

On a 1990 GS 500e; The Throttle Stop Screw ( Knob like Screw extending downward from the center of the Carburetors ) What would be the approximate number of turns to adjust it from scratch?  I'll look for an approximate number of turns from either from all the way clockwise or all the way counter clockwise...

Thanks for the help....

[Michael]

Carburetion Question:

On a 1990 GS 500e; The Throttle Stop Screw ( Knob like Screw extending downward from the center of the Carburetors ) What would be the approximate number of turns to adjust it from scratch?  I'll look for an approximate number of turns from either from all the way clockwise or all the way counter clockwise...

Thanks for the help....

It doesn't have a set number of turns, or even a ballpark figure, because how much it needs to be turned in depends on how the rest of the setup is adjusted, eg jetting, etc.  Best thing to do is to turn it to get a feel for how far in it will go, then set it at half way out.  Start the bike and let it warm up.  Then turn the knob in or out to adjust the revs to a nice smooth idle, usually somewhere around 1100-1300 rpm.  Good luck.

[davipu]

when the bike is cold, you turn it counter clockwise till it falls out then you put it back in just far enough that it isn't touching anuthing on the throttle. apply full choke start bike if the choke is adjusted properly it should run between 2500 and 3500 keep adjusting the choke to keep it in this range. after the bike is warm adjust the throttle stop to whare it idles at 12-1300  the manual says 12, but I have found that the extra 100 rpm's really help in the lower end torque/ take off power. once you get it set to whare it is idling at 12 then it is set.  you will find that it needs constant adjustment while riding and that it becomes second natureafter a few times.

[Michael]

you will find that it needs constant adjustment while riding.

Hmm.  I haven't found that.  Mine has been very much set and forget.  Of course I have to reset it after each time I fiddle with the carbs, jetting, etc, but once it's set it stays that way till the next service, when the guys at the shop set it too low again.  :lol:

[MarkusN]

When you have the carburetor bank out it's easy to preset it approximately: There is a set of small holes in the venturi where the idle mixture enters the carb. This set of holes is located close to the point wher the butterfly completely closes the venturi. Adjust the idle screw so that the butterfly partially covers those holes (I think in my case just one of them is partially exposed when I look into the carb from the downstream side.)

You will be surprised just how throttled throttled means. the butterfly is practiacally shut tight.


Oh, and I never fiddle with the setting either. Probably once per season. Run the bike well warm, then adjust to 1200..1300 RPM. From there it's just keep her happy with partial choke when cold.