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'83 GS550 Idle Going Crazy

  • Thread starter Thread starter GS550ED
  • Start date Start date
GS550ED said:
So I spoke too soon in the thread I last posted saying that the bike ran fine. I recently installed some aftermarket Accel coils on my 1983 GS550ED and it ran fine except for running extremely lean and bogging bad. So I took the jets back out and upgraded them to one above stock (stock is 95 & 102.5 so I upgraded to 97 and 105) Strangely enough, the jets in the bike when I bought it were like 85's and 87's...

Anyways, after putting it back together, as well as replacing the idle jets with new ones of the same size and a new float valve seat and needle, and new O-rings all around, it started up after spraying in some carb cleaner. But after this the idle became extremely erratic even after it warmed up. It would leap up to 4-5k, and after I naturally turned down the idle, it would idle fine at 1200-1500 until I revved it, when it would then get stuck at 4-5k, or kill itself. I've played with the idle adjust for hours and I seem to find a sweet spot only for the bike to not like it 10 minutes later.

I cleaned the carbs very thoroughly and even tried using the stock number (95 and 102.5) jets just today, but with no luck. It won't stick with an idle. I'm at the end of my rope...I must have screwed up the carbs somehow.
Click to expand...

take the idle jet screws out. PITA but I bet that the cavity is filled with corrosion and that the o-rings are shot. That woul make adjusting idle impossible.
When I did mine recently I found a huge difference in performance just by replacing the tiny washers and o-rings.

You should check the throttle cable for binding. You need to be sure the carb throttle plates are full closed when the throttle is in the close position. You can accidentally have the cable jump in the twist tube which will have the throttle cracked open.
 
JEEPRUSTY said:
take the idle jet screws out. PITA but I bet that the cavity is filled with corrosion and that the o-rings are shot. That woul make adjusting idle impossible.
When I did mine recently I found a huge difference in performance just by replacing the tiny washers and o-rings.

You should check the throttle cable for binding. You need to be sure the carb throttle plates are full closed when the throttle is in the close position. You can accidentally have the cable jump in the twist tube which will have the throttle cracked open.
Click to expand...

I cleaned the cavity with very fine steel wool and compressed air. My carbs actually do not have O-rings or washers in the channel where the idle jets go. They are a one-piece assembly. I did replace the washers and O-rings everywhere possible, though.

The throttle cable was extremely tight but seems to be in the correct place.

Thanks for the troubleshooting, though! I got an okay idle earlier today and I hope to perfect it!
 
GS550ED said:
I cleaned the cavity with very fine steel wool and compressed air. My carbs actually do not have O-rings or washers in the channel where the idle jets go. They are a one-piece assembly. I did replace the washers and O-rings everywhere possible, though.

The throttle cable was extremely tight but seems to be in the correct place.

Thanks for the troubleshooting, though! I got an okay idle earlier today and I hope to perfect it!
Click to expand...


I think I meant the steel needle valves. Are you talking about the small brass jets in the underbody of the carb?
 
JEEPRUSTY said:
I think I meant the steel needle valves. Are you talking about the small brass jets in the underbody of the carb?
Click to expand...

Oh, the needle valves. Yes, I replaced the washers there and also thoroughly cleaned the channels with steel wool and air.

I actually have got the bike running fairly decent. I think I need a fuel filter but besides that I think I've got the carbs good and synced.
 
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