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GS550L Won't run after carb work

  • Thread starter Thread starter scott808
  • Start date Start date
HTML: 
My brain is stuck on the VMs because all my current Suzukis have them.
Not a bad place to be they are very nice carburetors.:)
 
VMs are for sure way easier to work on and tune than CVs are. The one bike i had with the was the 82 1100 that Stahlgrau333 up in Norman Oklahoma has now.
 
3.5 is 1 - 1.5 too many turns. Ill bet you plugs are now fouled compounding the problem.
As I said this bike hates running out of gas it is super hard to start even on prime when it does so.
 
Thanks guys. I will check. But with this type of carb how many turns out should the mix screws be set at?
 
Uodate: This is driving me crazy.

The bike starts and runs on starting fuild. Sounds awesome.

If I pull the gas line off the carb I get a steady flow of gas.

When I pulled the carbs I carefully removed the bowls without tiping and both were plenty full.

I checked all the passageways I could see and blew carb cleaner and compressed air through. I soaked and visually checked each jet before I reassembled the carb.

The plugs are not wet after cranking the started repeatedly. They look good.

The bike ran OK before I touched the carbs. But it would quit for no apparent reason and not restart until it sat for a while.

What could be stopping the flow of gas from the bowl to the cylinders?

Somebody please tell me what I am missing?
 
scott808 said:
Uodate: This is driving me crazy.



The plugs are not wet after cranking the started repeatedly.

What could be stopping the flow of gas from the bowl to the cylinders?

Somebody please tell me what I am missing?
Click to expand...

I enjoy being redundant !.... that stuff about plugs not wet after cranking

"Anyways, pulling jets and cleaning them is nice, but this doesn't ensure clean passages from pilot jets up thru and into carb throats- if they are gunked up, not enough fuel and engine will fall flat. "
 
Normally I would agree with you, but the bike was funning fairly well before I started and although I did not perform a complete carb overhaul to GSForum standards. I did check very little passageway. The bike should a least start or chug a little. Without the starting fluid I can't get anything unless the choke is on full. There must be something else.
 
Large O rings between the intake stubs and cylinder head are probably shrunk and allowing massive amounts air to be drawn in first when cranking engine during start up attempts.Engine cylinders are filling mostly with air:very little gas in the mixture.Air/gas mixture ratio is mostly air,will not ignite in cylinders(too little fuel=dry spark plugs).Pull carbs and remove intake stubs and install new proper size O rings.
 
What have you got for voltage at the coils, a weak spark there may not fire gasoline but would starting fluid.
 
I just looked at a diagram of your carburetors. Am I correct that you have two two-barrel carburetors instead of the more common rack of four? If that is the case from the exploded view of the carburetors I looked up, they seem just a wee bit more complicated to work on than what most of us have on our bikes. Unless you have a pictorial rebuild tutorial on those carburetors I can see how it would be easy to make an assembly mistake if you are just shooting from the hip. Throw away that starter fluid before you destroy your rings and get some pictures up so people can see what you have. I know your carbs have been discussed, but you need to talk to the ones with hands on experience with that particular carburetor.
 
I choose a bad petcock.............
I knew a girl once wanted to sing from her diaphragm.
 
I knew a girl that swallowed from the petcock...she never needed a diaphram!!!!

OK maybe over the top but i just couldnt resist.
 
Yeah hell I should have finished that post.
It was a bad ref to Steve Martin.

So wtf is wrong??
 
Air induced through an opening between carb set ends (outlets) facing engine and intake header stubs.Loose clamps,holes,cracks,splits in rubber boots etc possible.More possible is large O rings between intake stubs and cylinder head worn/shrunken now undersize,no longer sealing and preserving the vacuum : disruptioning a marginal vacuum by allowing large amounts of air into cylinder intake valves.A short circuit effect is created by this:air enters before any gas mixture from carbs can arrive due to broken vacuum effect when throttle is cracked the air is sucked in first(at intake valves header stub area) and the gas never arrives.Motor may start up and run but with even with full chock on the motor will stop as soon as throttle is even slightly cracked open due to air intrusion breaking up the marginal vacuum,The cylinders are full if air then, no or little gas to sustain combustion process.Air not combust by itself.need gas in the cocktail mix.Find the air intrusion and fix problem,My Siamese twins advised me on this.Good luck!
 
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no where in this thread do I see that you DIPPED and soaked the carbs properly..

you mentioned in your first post that you removed the "easy" stuff.

that means to me that you did NOT dis assemble the carbs including the emulsion tubes etc and dip them ???
or am I sleepy and don't see this?

Here we go again, ASSUMING the carbs were cleaned properly....:confused:
 
barnbiketom said:
no where in this thread do I see that you DIPPED and soaked the carbs properly..

you mentioned in your first post that you removed the "easy" stuff.

that means to me that you did NOT dis assemble the carbs including the emulsion tubes etc and dip them ???
or am I sleepy and don't see this?

Here we go again, ASSUMING the carbs were cleaned properly....:confused:
Click to expand...
He did it the "easy way" twice (at least), maybe the third time will be charmed!
 
scott808 When you remove the carb set it is a good opportunity to change out those 4 large O rings at intake stubs/cylinder head. You will avoid removing the carb set for a second time.If the O rings haven't failed already believe me they surely will..and off come the carbs again.Do it properly and all will be good..Best to You!
 
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This sounds like a petcock problem to me. I Have a 1982 Suzuki gs550l and the same thing happened to me. The stock petcock can be tricky if it gets dirty. try running it on prime and see if anything changes. just sounds like its not getting gas to the bowls. Doesn't always have to be the carbs.
 
It still won't start. I pulled and disassembled the carbs. Dipped them and followed all the procedures in the guide. I replaced the O rings and checked for air leaks. I get plenty of gas if I pull the fuel line off the carbs so it is not the petcock or filter. There is fuel in the carb bowls. The bike will only run if I use starter fluid and then quits. No gas smell. Plugs are dry. It does not seem to be getting gas into the cylinders. Help Please.
 
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