GS850G 1981 with runaway throttle... scary.. whats wrong with it?

[04colyZQ8]

I finally found the newbie top 10, it's at the last page?? This forum is backwards all new posts at the top, and older posts on the last page?? Confusing? But now that I know that my life will be easier, you kept mentioning this newbie thread and I couldn't find it??

Everything I have done to the t, except replace the orings for the intake boots. I now read that Brake clean doesn't prove that out, for being sealed.

Please be aware that I have two identical bikes, the parts bike I half ass did work too, just to see if it would run enough to see that the clutch and trans work?

This bike is my baby and I have adjusted the valves, replaced the shim buckets, and throughly cleaned and replaced all orings in the carb.

I don't have a verneer caliper to check float hieght or a carb sync gauge. Both I will buy, and when I pull the intake boots off too replace the orings I'll check float height.

Perfect weather right now and I can't ride? Sucks guess I won't be ridding for a few weeks, no one carries tools around here. And parts are hard to get

[04colyZQ8]

I am not a barnyard hack.... thanks!!!!!!!!!!!!!!!!!!!!!! I'm a very mechanically inclined, I've just never had luck with carbs, Injection, I can tune with a lap top. I've rebuilt engine and transmissions, with no trouble, on trucks. I'm new to motorcycles and new to carbs.

[04colyZQ8]

I like this.

What ever.... way to discourage someone???? Go back to a time were you started working on bikes? And think of how this might have made you feel? If you have nothing good to say?? Maybe don't post at all?

Please have understanding for someone trying to learn a forum, and learn motorcycle mechanics at the same time!

[Burque73]

I finally found the newbie top 10, it's at the last page?? This forum is backwards all new posts at the top, and older posts on the last page?? Confusing? But now that I know that my life will be easier, you kept mentioning this newbie thread and I couldn't find it??

If you'd like the oldest post displayed first simply go into your settings (top right corner) then in the third box down on the left under "my settings" click general settings. Scroll down to thread display options and set it to oldest first.

Hope that helps

[Nessism]

I finally found the newbie top 10, it's at the last page??

In the very first reply to this thread I provided you the link. It's in my signature and I mentioned that too.

Also, in the carb rebuild tutorial, also linked in my signature, it tells you how to tune the pilot screws.

[jsandidge]

Maybe there is a member who is close to you that could loan you a carb synch tool, or maybe even help you use it and set the mixture screws. Why don't you put your location in your profile so it will appear in the upper right corner of your posts?

[04colyZQ8]

Maybe there is a member who is close to you that could loan you a carb synch tool, or maybe even help you use it and set the mixture screws. Why don't you put your location in your profile so it will appear in the upper right corner of your posts?

Great idea! Will do! I'll post up a generic oring size soon at Fluid seal

[Nessism]

If you dig through the archives the O-ring size is already there. You just gotta go find it.

Here is the info. It took me 1 min. to find...http://www.thegsresources.com/_forum...inlet-manifold

[Guest]

What ever.... way to discourage someone???? Go back to a time were you started working on bikes? And think of how this might have made you feel? If you have nothing good to say?? Maybe don't post at all?

Please have understanding for someone trying to learn a forum, and learn motorcycle mechanics at the same time!

I'm not trying to discourage you, I'll apologize for that post. But you seem to be ignoring or double guessing tbese guys and they know their stuff. Take their advice and you will not be dissapointed.

[04colyZQ8]

I'm not trying to discourage you, I'll apologize for that post. But you seem to be ignoring or double guessing tbese guys and they know their stuff. Take their advice and you will not be dissapointed.

Thanks accepted, and I understand, I'm following instructions now

intake orings replaced, float level adjusted, carb thread read, followed to the t! Pilots out 2.5 turns.

remote mounted gas tank, drilled out 4) 10-32 screws as nipples I installed in boots, 4) vacuum gauges disasembled them, Calibrated the gauges to each other looped lines and pinched with zap straps, unitill readings were smooth and not bouncy.


Adjusted the throttle stops matching them to carb #3. They are within 10% of ones other really close now, they were out for sure!

Adjusted pilots in 1/4" rpm lowered, adjust out 1/4, no change, 1/4 out again, Rpm rises, turn back 1/8 turn seems happy, carbs still in sink.

Adjust idle to 1200 rpm.

cant wait to test ride!

[Guest]

Good deal, man. Enjoy that bike.

[londonboards]

Sorry to hijack this thread but I have a question for Nessim regarding his comment about the pilot screw:

"The mixture screw setting is relatively unimportant. Just set them to 2.5 turns open from lightly seated and call it done. They only affect mixture at idle and tip in."

I'm always confused about the effect of the mixture / pilot / air screw. I've seen these diagrams and always assumed that even though the overall effect on the mixture is quite small (which affects the engine disproportionately at idle) it would still have an effect on the overall mixture as follows:







But since most of us only really use up to 1/4 throttle turn in normal everyday travel, the adjustment of this piece of the carb system is most critical.

Or have I missed something?

[04colyZQ8]

Interesting it apears to have an effect, all be it small but even at wot?

Sorry to hijack this thread but I have a question for Nessim regarding his comment about the pilot screw:

"The mixture screw setting is relatively unimportant. Just set them to 2.5 turns open from lightly seated and call it done. They only affect mixture at idle and tip in."

I'm always confused about the effect of the mixture / pilot / air screw. I've seen these diagrams and always assumed that even though the overall effect on the mixture is quite small (which affects the engine disproportionately at idle) it would still have an effect on the overall mixture as follows:







But since most of us only really use up to 1/4 throttle turn in normal everyday travel, the adjustment of this piece of the carb system is most critical.

Or have I missed something?

[Nessism]

Do an experiment for yourself: try setting your pilot screws at 2.5 turns open and go for a ride, then reset them at 2.0, 3.0, 3.5, and see if you can tell the difference. The biggest thing most people will notice is the smoothness of the idle. 2.5 turns open will provide a reasonably good idle for most bikes. The proper way to tune these screws is with the engine fully warm and then tweaking them until you achieve the highest idle speed. They will have a small effect just off the line too.

[04colyZQ8]

I just rembered something important! The seal between the air filter and box foam gasket is gone, can't find one anywhere, not sure what to do? Side rubberfrom box to chrome cover is also in poor shape! Right side muffler is blown! Non of these parts I can't find!! And it was running perfectly up untill last week?