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Engine surges at full throttle '83 GS850

  • Thread starter Thread starter adamgagne
  • Start date Start date
A

adamgagne

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I have a 1983 GS850 that I recently aquired. It has spent most of its life sitting in a garage. I cleaned the carbs on it, and changed all the fluids.
when I apply full throttle on it hesitates at about 1,000 to 2000 rpm and then surges up, accelerating rapidly. This is more prodominant when the engine is not fully warmed up (for the first 10 min of riding). I was thinking that i might be an excess valve clearance, but I don't have the tools or experience with checking those. A mechanic told me it was probably some jets in the carb and that I didn't clean them good enough last time, so since then I have cleaned the carbs again (separating them all and cleaning individual jets). one thing I noticed when the carbs were apart was that one of them was missing the little rubber plug thats supposed to block the top of the idle mixture jet. Could this have caused the surging?
I also noticed that the mixture screws were quite different, some were seated and then 1/4 turn out, some as far as 4 turns out. Is this normal? Should I set them all the same, and if so where?
I haven't been able to put it back together yet, because I'm waiting to get the starter replaced, I rebuilt the one in there and it ate the +brushes within 500 miles
 
WHen you say "rubber plug over the idle jet": Are you refering to the jets underneath inside the float bowl (there is a rubber plug there) or are you refering to the top outside of carb (called pilot jet)? Mine has a small thin metal plug with a hole in it over that setting. I think the hole is from it having been drilled out so it can be removed, and then put back. I have seen bikes with all of them gone. SO I dont think one of them missing could cause your problem.

And you say this hesitation doesnt happen so much after it is more compltey warmend up? I want to hear a good answer from somebody about what might cause that, sounds like situation I am having at present on my GK.
 
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The rubber plug inside the float bowl.
I'll try to attach a pic of one
 
Those plugs are mandatory....could be causing your problem also make sure the air box is sealed good
 
Thanks REDMAN, I'll look into that, first I have to find some washers for the air valve screws, apparently the last owner didn't think it needed them.
I can't wait to get this thing running good for the first time...
 
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