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Spark plug #1 black

  • Thread starter Thread starter sihi
  • Start date Start date
S

sihi

Guest
Hi. On the 1 valve I found that spark plug is black. I did carb rebuild and vacuum sync is done.I use every time torque wrench. What it can be?
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Looks like it is running rich, but we will need to know what bike it is before offering suggestions, as the adjustments are different, depending on the carbs.

Nice to see your location in your profile, now please take a moment or two to add a signature that mentions your bike. It might prevent times like this. :encouragement:

.
 
yes I use this new plugs right after carb clean.

signature is done.:)

I wrote here anyway gs650gl 1982
 
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Well if its not smoking its probably a rich carb setting. Does the engine produce good power?
 
about power --- it's my first bike for me is powerful enough. I wish to try another gs650 .at 4000 rpm it go 83-85 km/h at 5000 rpm 105 - 110 km/h . and it's not smooking only at cold start half minute. I did adjust idle rpm screw with "Steve method" carbtune connected and I screwed in to moment when vacuum start dropping. I am using D8EA X24ES - U.
 
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I'd venture to guess from the pics that since 1 and 3 both look a little rich, that you might have the floats set a little high or the float needles are leaking a little. Since the bike leans to that side, those would be the most likely to get a little fuel in the cylinders when its parked on the side stand.
 
Do those plugs even fit? I thought all GS's use B series plugs from NGK. The first letter tells you the plug's thread size.
 
I have a 550 head on the bench at the moment, which will need 14mm plugs - eg B6ES. But the 650 head next to it takes 12mm (D***) plugs. Can't tell you why.....
 
I would be inclined to clean the No 1 plug, swap over 1 & 4 HT leads and see if the sootiness moves. It could be a bad lead or plug cap.
Just having a closer look at that plug it could be oil from a stem seal which would be consistent with a bit of smoke on a cold start.
 
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steveb922 said:
I have a 550 head on the bench at the moment, which will need 14mm plugs - eg B6ES. But the 650 head next to it takes 12mm (D***) plugs. Can't tell you why.....
Click to expand...

The plug size changed at the same time as the newer head design which the 650 has, might have something to do with that.
 
Brendan W said:
I would be inclined to clean the No 1 plug, swap over 1 & 4 HT leads and see if the sootiness moves. It could be a bad lead or plug cap.
Just having a closer look at that plug it could be oil from a stem seal which would be consistent with a bit of smoke on a cold start.
Click to expand...

I change plug caps same time as carb rebuild.Also I measured resistance is 21kOhm. (In service book is 35kOhm but somebody said is alright. ...). I have original coils ---- HT cords is welded direct to coil. ......
Also I never park on side longer than 10 minutes. Only center stand.
 
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sihi said:
I change plug caps same time as carb rebuild.Also I measured resistance is 21kOhm. (In service book is 35kOhm but somebody said is alright. ...). I have original coils ---- HT cords is welded direct to coil. ......
Click to expand...

I would still swap them over just to eliminate it and it's easy to do.
 
I should said that I drove with this plugs 100 km.
And Sorry I don't understand. U mean swap 4 to 1 end of the cord --- so other end of cord (that which is attached to coil) stay on same place??
 
sihi said:
I should said that I drove with this plugs 100 km.
And Sorry I don't understand. U mean swap 4 to 1 end of the cord --- so other end of cord (that which is attached to coil) stay on same place??
Click to expand...

Yes. Just swap the plug cap ends of the lead over.
You could have a rich mixture or a weak spark due to a crack in the lead. The plug looks to be slightly wet which could be fuel or oil especially with those lumpy deposits.
 
Results are bad. After 70km it start to be black it seems to me like carbon. But I should say that before I bought bike there was same little leakage over #1 valve . I changed sealing and it starts slowly again. also compression test was little bit strange #1-190 #2-170 #3-170 #4-175. I don't know where should I start first

results.jpg
 
Hi . what it can be that leakage is all the time from one place even after I changed sealing?(can it be pressure from cylinder?)
 
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