Gs550es 5000 rpm fail

[Nessism]

rule out the spark plugs its not the plugs i promise. Next if you are going down the road and you hit 5000 rpm with the choke all the way off it starts breaking up like its starving for fuel. at that point if you put the choke back on it richens the mixture by restricting the air flow and cures the breaking up

GS carbs don't choke per say (restrict air flow) they enrichen the mixture by adding more fuel. If pulling the choke out fixes the problem then the mixture is too lean.

[countrycummins99]

awesome

so everything im seeing points to there not being enough fuel at high rpm so its either that stupid extr fuel filter or the jets are the wrong size

GS carbs don't choke per say (restrict air flow) they enrichen the mixture by adding more fuel. If pulling the choke out fixes the problem then the mixture is too lean.

[xxBenJamminxx]

Not saying that the choke doesnt help, but I thought the enrichment valve (choke) only had any effect with the throttle closed? I was under the understanding as soon as you give it ANY throttle at all that the "choke" circuit is no longer active?? Am I way off on this or no? Also not trying to hijack but just to make sure all things are looked at from all angles rather.

Ben

[countrycummins99]

i would say no because in cold weather you would want it to continue to work until the engine was warmed up even if you are driving it

Not saying that the choke doesnt help, but I thought the enrichment valve (choke) only had any effect with the throttle closed? I was under the understanding as soon as you give it ANY throttle at all that the "choke" circuit is no longer active?? Am I way off on this or no? Also not trying to hijack but just to make sure all things are looked at from all angles rather.

Ben

[Agemax]

i would say no because in cold weather you would want it to continue to work until the engine was warmed up even if you are driving it

it has no effect whatsoever above about 1/4 throttle, certainly not up around 5000rpm

[countrycummins99]

i am going to disagree based on my experience with this bike if your going down the road and its breaking up at 5000 rpm simply switch the choke to on and the problem goes away so that says to me its adding more fuel

it has no effect whatsoever above about 1/4 throttle, certainly not up around 5000rpm

[Agemax]

i am going to disagree based on my experience with this bike if your going down the road and its breaking up at 5000 rpm simply switch the choke to on and the problem goes away so that says to me its adding more fuel

it sounds like you are adamant to disagree with everything anyone tries to tell you, so good luck on your own.
i give up trying to help with suggestions

[countrycummins99]

not trying to disagree just simply pointing out that there is nothing in the shop manual to indicate that the starting circuit AKA fuel enrichment is somehow disabled after a certain amout of throttle it simply is not i have the manual in front of me so if you could explain to me how it is i would be more than glad to listen but so far i have seen no explaniation of how it shuts off and again im greatful for all the advice and responses im just trying to weed through what pretains to the current problem

it sounds like you are adamant to disagree with everything anyone tries to tell you, so good luck on your own.
i give up trying to help with suggestions

[BassCliff]

Greetings and Salutations!!

Hi Mr. countrycummins99,

Any modification to intake or exhaust will require jetting changes. Yes, these were lean from the factory but they ran right. Yours does sound like a fuel problem. The first thing to do is disassemble the carbs, make sure they are clean (full strip and dip if necessary), replace all of the internal O-rings, adjust the float height, make sure they are jetted properly, etc. You'll find lots more information in the links below.

If you are here you probably have a 30 year old motorcycle that needs about 20 years worth of maintenance. In the links below you'll find maintenance lists, documentation, wiring diagrams, "how to" guides, vendor links, tips, tricks, and a whole lot of GS goodness. This is your "mega-welcome". Let's get started.

Let me dump a TON of information on you and share some GS lovin'.

I just stopped by to welcome you to the forum in my own, special way.

If there's anything you'd like to know about the Suzuki GS model bikes, and most others actually, you've come to the right place. There's a lot of knowledge and experience here in the community. Come on in and let me say "HOoooowwwDY!"....

Here is your very own magical, mystical, mythical, mind-expanding "mega-welcome". Please take notice of the "Top 10 Common Issues", "Top 15 Tips For GS Happiness", the Carb Cleanup Series, and the Stator Papers. All of these tasks must be addressed in order to have a safe, reliable machine. This is what NOT to do: Top 10 Newbie Mistakes. Now let me roll out the welcome mat for you...



Please Click Here For Your Mega-Welcome, chock full of tips, suggestions, links to vendors, and other information. Then feel free to visit my little BikeCliff website where I've been collecting the wisdom of this generous community. Don't forget, we like pictures! Not you, your bike!

More links to helpful threads in the forum:
Help! Your Bike Won't Start
DON'T DO THESE THINGS
Help! Your Bike Won't Run Well
Oh God! Pods!


Thanks for joining us. Keep us informed.

Thank you for your indulgence,

BassCliff

[JEEPRUSTY]

not trying to disagree just simply pointing out that there is nothing in the shop manual to indicate that the starting circuit AKA fuel enrichment is somehow disabled after a certain amout of throttle it simply is not i have the manual in front of me so if you could explain to me how it is i would be more than glad to listen but so far i have seen no explaniation of how it shuts off and again im greatful for all the advice and responses im just trying to weed through what pretains to the current problem

Alas you are correct the enrichment is eternal much like the revolution is.

Since this is being a total pig for you and acts just like my bike when it runs outta gas I would start with a clean tank and step through each component till you get to throttel response in all rpm ranges.

The nasty thing about float height or presence of fuel in the bowls lies in the fact that the float drops to let in more fuel through the needle valves.

One serious bottle neck on the stock BSW30 could be the dome screen filters on the needle valves. If they be partially plugged with solid rust bits then you would be in for a fuel starvation issue as well. I pulled my seats once while cleaning because the o-rings on them had appeared to fail. I was a wee bit shocked to see how much junk had gotten past the petcock filter.

Journey of a thousand miles starting with:
The tank then the petcock then the hoses then the dome filter screen on the needle valve seats then the float height then all orifices etc clean as a whistle. ( knock out the needle jets with a dowel and behold the crud in the tube they occupy as well as the clogs in the pin holes that must be perfectly clean to allow properly metered fuel to pass the jet needles when on the main circuit.

This and many other run on sentences will set you free.

[Agemax]

Alas you are correct the enrichment is eternal much like the revolution is.

you are sort of right, but the enrichment circuit will only work properly with a closed throttle.

[gustovh]

Remove the valve cover and check your cam timeing, you could be 1 tooth retarded on the intake cam, trust me.
V

[countrycummins99]

Thankyou

for all the great info guys i will be digging into the carbs tomorrow to see if there is anything else going on there before i jet them i will let you know what i discover thanks again

[countrycummins99]

dipped

dipped the carbs tonight also found the main jets were 100 and 95 which is to small

[Nessism]

dipped the carbs tonight also found the main jets were 100 and 95 which is to small

With the stock airbox and filter installed, you shouldn't have to bump them very much even with a header.