Spark Plug

[Keith]

Hi.

Was working on the bikes earlier, gave them a good clean and done the basic maintenance. I pulled the plug out of the CG and I cant determine if its burning lean. I'd consult a Haynes manual if I had one.

https://img77.exs.cx/img77/9303/pict00019eu.jpg

A friend reckons its burning slightly on the lean side, but I cant tell.

Can any of you?

Any help is appreciated.
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Aprilia RSV Mille R Edwards Replica - Aprilia RS250 - Suzuki GSXR600 Supersport Race Bike

[Bomberman]

Sparks < That may be helpful, at least best page I know of on the subject.
Looks OK to me though I'd say.
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'Allo! My name is Inigo Montoya, you killed my father, prepare to die!
'89 TZR 125 - '94 GPZ500s - ZK3 GSXR600 Alstare

[Keith]

Thanks for that Bomberman.

Looking at some of those pictures, it appears to be OK but running slightly lean. Should I be worried about it running as it is? I mean, its only a CG, not like its a high powered 2 smoke like my RS.

[Edit] Just went back out, let the bike run for 10 minutes then done another plug chop. It appears to be running richer now, which is good. I'd much rather have a smokey bike than a seized one.
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Aprilia RSV Mille R Edwards Replica - Aprilia RS250 - Suzuki GSXR600 Supersport Race Bike

[stinkwheel]

Looks nice and clean to me from your photo. If it has done quite a few miles on the plug and it looks like that, I would be well pleased.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Kickstart]

Hi

Looks fine to me, but the colour of the plug when after idling is not going to tell you much. Also a weak mixture at idle is not going to be much of a problem.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[kasandrich]

Looks OK to me.

Put it back in, go ride it for 10-20 miles, then check it. but it doesn't look far out and you should only mess with it if its miles out.
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Richard

CBR1000FM

[Dom_]

Looks just like my RS plug.

[Keith]

Well the CG has just been on its maiden voyage. Took it about 5 mile then checked the plug. Looks pretty much the same.

I'm just a little concerned its on the lean side, the last thing I want is a seizure.

Shame you cant just mix some oil in the petrol, 2 stroke style, to richen the mixture!
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Aprilia RSV Mille R Edwards Replica - Aprilia RS250 - Suzuki GSXR600 Supersport Race Bike

[rizo-sri200]

[Kickstart]

[kasandrich]

Its a 4 stroke, and although the rule that its not good for it to run lean still counts, it is a much more robust engine than your RS 2stroke.

......Basically as long as it is all std and not been messed about, by some dork, trying to get an extra 2 mph out of it, then it should be virtually bullet proof, so don't worry about it.
____________________
Richard

CBR1000FM

[Keith]

[kasandrich]

Whereas, something 2 stroke in a high state of tune and being ridden hard, if its a bit lean will end in tears.

With a low tune 4 stroke, it would have to be a long way out to burn a valve or piston.
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Richard

CBR1000FM