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Reading Plugs

  • Thread starter Thread starter srg
  • Start date Start date
S

srg

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These plugs look newer. They are from the previous owner (of about a year ago). The bike has not run since then until a few weeks ago (I've been working on it). When I've run it in the past few weeks, it is very rough (high rough idle). I'm working on figuring out how to smooth it out and get it idling well. I'm going to replace the spark plugs, the caps, and probably wires/coils as well. But...can anyone read these and give me their opinion? Is this rich?

plug1.png


plug2.png
 
Ok, so rich means too much gas. So it could be carb jets or restrictions in the air flow? What else?

I adjusted my valves, fully dipped and cleaned my carbs (setting the float level), replaced the air filter element (coating with oil, then wringing it out), replaced the carb boots and o-rings. Maybe too much oil mist on the intake air filter? I did not yet set the air/fuel mix screw or vacuum sync the carbs (I was waiting for adapters).

The bike is in my signature: 1980 GS550L. CV carbs.
 
Yes the foam MAY be too saturated and inducing a choked condition. Where are the mixture screws at now from very gently seated?? Good start point is 2 to 2 1/2 out as the base point.

Timing check and carb syncing will go a long way too. BUT you gotta get them all done at one time to get analizing things. I would get it all done and then get new plugs to start seeing what the plugs are telling you. Clean those plugs to do the sync and then put in the new plugs after that. Oh and go to the stickys at the top and review the sticky about CV carb tuning procedures.
 
Will do, thanks! How do I go about cleaning these old plugs in order to sync it up? I'm not sure where the mixture screws are at, that'll be the first thing I check.
 
Note that all you have is the mixture screws on CV that meter a premixed gas and air mixture to the cylinders. If the foam isnt making it choke, and all other things are spot on, your only way to adjust the mixture is to move the jet needles up or down ( depending on if you want to go leaner or richer ) and to change out pilot and main jets.

And be 100% SURE the rubber plugs over the pilot jets are sealing..and are even there. Leaky plugs will make them run rich also in spite of everything else you try so start there.
 
Get some acetone and Qtips and clean down into the plugs around the ceramic. Scrape them with a paper clip wire too and get the fouling gone as much as you can. Hit the ends on a wire wheel or brush and regap them.

the mixture screws are on the top rear of the carbs..just behind the top covers.
 
gas fouled plugs are never the same(can not be made 100%)...spend 8 bucks and install some new ones.
 
I told him that to get a good read AFTER doing the gauge syncing he would need new plugs. I told him to clean the existing ones and use them just to do the sync...why waste a set of new plugs doing the sync is my position here. Sync with the old ones and then move on with new ones and see what they are saying then. Hope this removes any confusion as to what I was suggesting.
 
srg said:
Will do, thanks! How do I go about cleaning these old plugs in order to sync it up? I'm not sure where the mixture screws are at, that'll be the first thing I check.
Click to expand...

Uh oh, you dipped your carbs but didn't take out the idle mixture screws? The Idle mixture screws have an itty bitty o-ring on them. If you dip the carbs, the dip could have cause a problem there.
 
mrbill5491 said:
Uh oh, you dipped your carbs but didn't take out the idle mixture screws? The Idle mixture screws have an itty bitty o-ring on them. If you dip the carbs, the dip could have cause a problem there.
Click to expand...


Oh, no. I meant I didn't know where the mixture screws were set to. I know exactly where they're located. When I cleaned the carbs, I removed them, replaced the o-rings and springs, and the actual needle for one carb since I stripped it getting it out.
 
srg said:
Oh, no. I meant I didn't know where the mixture screws were set to. I know exactly where they're located. When I cleaned the carbs, I removed them, replaced the o-rings and springs, and the actual needle for one carb since I stripped it getting it out.
Click to expand...


Ah okay then, never mind lol.
 
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