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bs34ss carb issues

  • Thread starter Thread starter gsnewbie68
  • Start date Start date
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gsnewbie68

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Carbs seem ok but after bike warms up idle starts racing around 2,000 rpm if I adjust the idle stop screw till it's at 1,000 rpm after a few minutes it'll start dying adjusted it back up a few minutes later she starts racing again it's a 82 gs850l I'm not as versed with these carbs to play with them without some advice.
 
Sounds like an air leak. Did you change the intake boot O-rings? Clean the carbs and replace the various O-rings? Vacuum sync the carbs? Adjust the valves?

You might want to check the Newbie Mistakes thread to see if anything strikes close to home.
 
Yes I did replace all the orings through cycleorings.com but I will go completely through it tomorrow and see if I can find a air leak thank you for a direction to follow.
 
I pretty much had the same thing, I had replaced my intake boots and o rings but my airbox boots looked okay. Out of things to try to fix the air leak I replaced the airbox boots and that helped smoothed it out.
 
Don't forget the O-rings on the engine side of the intake boots. They're notorious for flattening out, drying out and cracking causing an air leak.
 
Those I did replace as well as all the orings in the carbs also completely cleaned them triple checked my cleaning because I've read over and over about guys having to go through their carbs again because they didn't get them clean enough.
 
Ya, the smaller passages in the idle and pilot circuits are harder to get completely clean. Just make sure you use a good carb dip and them IMMEDIATELY poke each opening and spray carb cleaner through every passage. Doing so will ensure you have clear passages and get you better orientated on how each path get fed.
 
Found the air box was leaking got it sealed up purrs like a kitten.
 
Have a new issue now off idle hesitation when I go to take off from a stop the bike lugs and chugs till I hit 3k rpm then she launches off like a rocket I can drive in that range but take offs not good or safe for my wife as this is her first year riding she is still learning to ride and my 79 g model is to big for her any ideas?
 
This is still a 82 gs850?...

since you tightenned up airbox, maybe you need to add some more mixture at idle by backing out mixture screws to avoid this hesitation.
 
Yes it is that thought had occurred to me I read that with the bike running to back them out till idle drops then screw in till idle drops counting the turns and the in between point is my setting. So I am trying that now. Being a newbie I like bouncing these things off you guys to be sure I'm on the right trail you just can't substitute experience.
 
Ok I have gone through the carbs again triple checked every thing float height sync carbs replaced every O ring resealed the airbox boots are still flexible and without cracks played with the air screws it still bog down off idle under load right as you take off in neutral it operates fine. Taking off from a stop it acts as if you're in third gear you have to feather the throttle to go and ride in the 3 k rpm range cause it acts the same in all gears. Any thoughts?
 
It's really frustrating me right now just tried to run through the gears on center stand still same issue now dies just hitting the throttle
 
Stock airbox but I finally found the culprit coil for 1&4 bad pipes cold ran direct power from battery to said coil no effect has 9.8 bolts from stock wiring electronic ignition system grounds good.
 
Are you sure all 4 cylinders are running at idle? You can check it by squirting water on the headers or a non-contact thermometer. What you are describing could be that one or more of your carbs idle jets/circuits are plugged or partially clogged. Once you get the carbs open enough to hit 3k rpm you are out of the idle circuits and into the high speed (much larger jets) circuit.
 
Another possible problem you may have would be worn needle jets and no matter what u do if they are in fact worn u will continue to having tuning issues until they are replaced with new. My bike had the exact same symptoms with a stumble off idle and then smoothing out as rpm increases and my needle jets were worn out. I have a aem wide band o2 sensor set up on my bike with a Mac 4 into 1 exhaust which has been extremely helpful with tuning in my bike.
 
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