Question about 1980 Suzuki Gs 550 L

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My 1980 GS550 Suzuki idles to high, about 3 to 5000 rpms. how do i adjust the idle.

When i start the bike up it idles at 3 to 5000 rpms.the book says it should be around 1 to 2000 do you adjust the idle speed.

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Adjust off the cable so its slack ! then between the carbs there should be the idle adjuster screw and back it off till rpm is about 700 ! rev engine and see if it returns ok ! ? if not then remove carbs and free off the butterflys etc etc !

Posted on Apr 19, 2014


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My 81 suzuki gs550 idles really high it wont adjust with the adjustment screw

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Adjust carb idle

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start the bike and then adjust each screw in until you hear the rpms drop then turn out until you again hear the rpms drop the setting is 1/2 the number of turns beween in to die and out to die
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Apr 19, 2014 | 1980 Suzuki Gs 550 L

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I recently bought a Suzuki gs 550 and need to reduce idle speed i don't know how to do this at the carb

the idle adjustment screw is located between the number 2 and 3 carburator float bowls bottom rear. I can bairly get my hand on it, but found that a flat blade screwdriver works fine for making ajustments. backing out the screw lowers the idle speed, while running it in increases it. To adjust make sure the motor is warmed up and the choke is off. Make adjustments from the right side (looking at bike from the back), by pushing with the screwdriver on the knurals of the adjustment knob, pushing knurals up backs the screw out, conversly down runs it in. Try for around 1000 rpms for your set speed. You want it to idle smooth and low, but you want it set so it won't die out when you come to a stop when you are riding. If you can not get the idle in this range, then there is some other problem needing attention. However, the idle at times may run a little bit higher than normal when you come to a stop after a hard ride, and should return to normal set speed after it cools down some. You should also make sure that the throttle cable is set at the proper tenion, if too tight, you won't be able to lower the idle. you may have to make adjustments a few times to get it right.

Jun 12, 2011 | 1980 Suzuki Gs 550 L

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If the bike starts up and the idle speed creeps to high revs all on its' own, this indicates an air leak somewhere between the center throat of the carb and the cylinder head. This is normally a rubber seal or rubber manifold that is old, hard and cracked. I am sure the carbs need to be cleaned, remounted and adjusted. This is a nightmare for the novice mechanic. Replace all rubber fittings and seals including hose fittings and hoses.

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Bike won't stay running without the choke out.

I also own a 1980 GS550L that had a similar problem, first thing I did to fix it is to add a can of seafoam to a half of tank of gas or less. The bike can run on pure seafoam if needed. Let it run for 3-5 minutes and shut if off. Let it sit for another 5 minutes then start the bike and take it for a ride. After 20 or 30 miles go ahead and fill the tank up with gas. Within a tank or so you should start noticing it idleing better and more power. On the GS550 the choke self adjusts as you use the throttle. There is no need to push it in the rest of the way. Even if you are extremely hard on the bike opening the throttle all of the way it will never go all the way in unless you push it all of the way in. I own two GS's and niether of which prefer to idle if I push the choke all of the way in. Once I did this and learned just to leave the choke alone and let it stay where it self adjusted as I rode the bike it has never stalled since at a light. You should be able to pick up a can of seafoam at any local autozone or advanced autoparts. Most likely your idle circuit on the carb is currently gummed up and the choke circuit is all that is that is working. Myself and freinds have used Seafoam to solve this problem and just about anything with a motor that was parked with gas in for an extended amount of time without any stabilizer added. It's well worth the $8 versus pulling the carbs apart.

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