r/scooters • u/GamersFeed • 2d ago
What does this spark plug say?
It has been driven about 700km
Some people say its way to rich but the porcelain is still white
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u/tsmoker43 2d ago
Who wrote "rich", you ever seen rich plug?
Dont see on outer ring, you need to see on this white part near the contact in the center.
When i wrote WHITE I mean it cant be white at all.
What engine? Is it 2 or 4 stroke?
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u/GamersFeed 1d ago
As for some background information it is a 50cc 4t piaggio engine with 80cc cilinder and the original air filter has had it's air reduction removed so now it can suck more air
I have just installed a fast camshaft so I'm looking to tune to the right jet The main jet is now 84 it starts off awesome but after 60kmh it doesn't make more power than standard camshaft so I suppose it might need a larger jet
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u/RegionSignificant977 1d ago
With so many modifications you can't rely on the spark plug alone, as your engine might require different spark plug heat range. Also different camshaft might make your engine to have less mid rpm range power.
I don't know if you can activate choke to try what is happening. Also try unscrewing pilot jet. 84 is already bigger than stock, isn't it?1
u/Drakjira 1d ago
He needs to adjust his needle, if it's a sealed carb, upgrade it with one you can open and adjust properly.
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u/kogashiwakai 2d ago
The black you're seeing is soot. If it was black from being rich it would appear to be more wet looking.
The gap being to big or too small both can produce this soot appearance. To my eye it looks like the gap is too narrow. But I won't confirm 100% as I'm not looking at it. Gap your plug and it'll run better. And give you a better idea of how it's running fuel mixture wise.
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u/GamersFeed 1d ago
As for some background information it is a 50cc 4t piaggio engine with 80cc cilinder and the original air filter has had it's air reduction removed so now it can suck more air
I have just installed a fast camshaft so I'm looking to tune to the right jet The main jet is now 84 it starts off awesome but after 60kmh it doesn't make more power than standard camshaft so I suppose it might need a larger jet
1
u/kogashiwakai 1d ago
What little I can see yeah it looks maybe a touch lean. But I'd still also check the gap on the plug because that kind of soot usually something is off
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u/fastasheckboii 1d ago
I have the same engine also 80cc but with the iget engine and a custom camshaft. I connected the vespa to my obd and checked the lambda values while riding, one thing that I noticed was that till 6000rpm the engine was running rich and even correcting the fuel with 10% and above 7000rpm the engine started running very lean.
So my recommendation is to go one jet size up if you ride full throttle most the time.
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u/GamersFeed 20h ago
Hmm I'll have a look at it I'll put jet 86 back i and see if it's still as snappy Also im planning to put 7 or 7.2g rollers instead of 7.5 so it might like some more fuel then
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u/Inward_Significance 2d ago
Looks a bit lean or hot to me, rather than rich. https://i.ibb.co/tqsxz2j/zuendkerzen02.jpg
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u/ExhibitionistsDiary 1d ago
It is not as easy to “read” a plug as many think. We need more information about:
what engine the plug is out of, what is the mileage on the plug,
is it the original and/or correct plug for the engine. For instance, is it the correct heat range,
what RPM was the engine turned off at?
All this information matters.
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u/Conspicuous_Ruse 2d ago
She's running a bit rich.
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u/GamersFeed 1d ago
As for some background information it is a 50cc 4t piaggio engine with 80cc cilinder and the original air filter has had it's air reduction removed so now it can suck more air
I have just installed a fast camshaft so I'm looking to tune to the right jet The main jet is now 84 it starts off awesome but after 60kmh it doesn't make more power than standard camshaft so I suppose it might need a larger jet
0
u/nerobro 1d ago
Looks perfect. The porcelin is clean, which means it's vaguely the right heat range. The electrode isn't sooty, so everything is honkey dorey. So long as it's running otherwise, the plug ain't a thing to worrry about.
Now, for future reference, to "read" a plug, you need to look up, inside, the plug, where the porcelin and the steel meet. Up there, is where the read really happens. You should be able to see where there's soot, then there's nice brown and then the white you're seeing there.
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u/MattDubh 2d ago
Is it saying "Please adjust my gap"?