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Still Won't Run at Idle

  • Thread starter Thread starter granny_rocket
  • Start date Start date
G

granny_rocket

Guest
Hey Folks
1985 Suzuki GS550L (all stock)

I have replaced the floats, adjusted the float level, thoroughly cleaned out the carbs and synched them by eye. Set what I like to call the idle mixture screws to 2.5 turns out and I can't get this bike to idle at anything less than 1500 RPM's once it heats up and idles down.

Any ideas? Is my "idle mixture" wrong? The haynes manual just says they are preset...doesn't give a number of turns out.

As far as I know plugs are brandy new and there are no vacuum leaks. FWIW The motor seems to run much smoother than it did prior to my second cleaning.

EDIT: the bike is still running rich (unburnt exhaust out the tailpipe) which is most likely my problem...should I maybe go to a smaller jet or something?

ANY INPUT GREATLY APPRECIATED!!!
I've had this bike for 3 months now and have been unable to get it on the road :cry:
I'd sure be nice to go crusin'

THANKS MUCH!!!!
-Al Conforti
 
For the high idle, I'd check the o-rings in the manifolds first. As for running rich, don't change jets if the bike is all stock and the carbs are also. Besides what you say you've checked, is the air filter clean? Is the ignition timing correct and do you have a good blue spark at the plugs? Are the float valves leaking any fuel out the bowl overflow lines? Are you sure all the jets are tight? Are all o-rings in the carbs in good shape? I'm not familiar with the carbs on your bike. Are they 'CV' with a diaphragm? If so, how is the diaphragm? Only if you have a similar pilot circuit as my '79 1000: The pilot screws are underneath and the air screws are on the side. Turning the pilots out is richer. Turning the air screws out is leaner. With carbs like mine, the pilots are generally about 1- 2 turns out and can be at different positions from the factory. The side air screws are generally out about 1 1/2 - 2 1/2 turns. A 1/2 turn on the air screws will make a little difference, A 1/2 turn on the pilots can make a big difference. If all the above checks out, you might try adjusting these screws.
 
is the air filter clean?
Click to expand...
Yes

Is the ignition timing correct and do you have a good blue spark at the plugs?
Click to expand...
Timing on the '85 models cannot be adjusted because the ignitor takes care of all that, or is there a way to do it im not aware of?

Are the float valves leaking any fuel out the bowl overflow lines?
Click to expand...
Im Not sure what you mean by this, but the leaking fuel im talking about is coming out of a breather tube off the front of the air box.

Are you sure all the jets are tight?
Click to expand...
As tight as I could get them without stripping them.

Are all o-rings in the carbs in good shape?
Click to expand...
Should be! I just replaced them, unless one happens to be bad....

Are they 'CV' with a diaphragm? If so, how is the diaphragm?
Click to expand...
They are CV carbs and the diaphragms look to be in good shape

Here's a picture of my carb:
suzuki.jpg

"adjustment number 1" is which - the air screw or pilot screw? I now that the 85 models had no way to control idle mixture - so then what is the actual name for this?

Thanks SO much for the input!!!
-al
 
I have an 83 with the same type carbs. the screws you have circled are set between 3 1/2 and 4 turns from being bottomed out on mine. I tried to adjust these about 1/2 turn in and it ran awful at lower rpm. From what I can tell this is the only low speed adjustment other than the idle stop screw that you adjust with your fingers.
 
I was just thinking....what is the float height in accordance to the factory manual?
My Haynes says 20.5mm +- 1mm and I read someone else's post saying the float wants to be 22mm. Im sure its not that big a a difference...but you never know!
 
If you have fuel leaking out of the air box or air box dump line, then you have float valves that are not sealing and possibly a bad petcock. This can make the bike run rich and also the fuel can enter the crankcase.You say it ran worse after you worked on the carbs. If you by chance mixed up the float valves they can leak. The valve and seat wear into each other and become a matched set. Sometimes even disturbing them will cause a leak.One or more just might be wearing out. I'm leaving right now for vacation but I'm sure you can find lots of info here about leaky float valves and petcocks. Good luck!
 
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