Spark Plug Covered In Oil - Bike Cuts Out

[tomhunter]

Symptoms on bike

- 2t, Rieju 50cc SMX
- Starts for a little bit, but if left idling will cut out
- Before it cuts out the engine makes a different noise, runs slower me tink
- Then if you leave the bike 5 mins it will usually start again, and then cut out in a min.

Symptoms on Spark Plug

- Spark plug black with oil

What I thought

I thought maybe it floods a little or something, then cuts out.... so then drains off/drys and so works again


Here are some links to resources about oily plugs:

https://www.rmh-d.com/service/spark_plugs.php

https://www.totalmotorcycle.com/maintenance/sparkplugs.htm

Any Help Greatly Appreciated,

Alex

[tomhunter]

I think it mite be the air filter needs cleaning...

thoughts?

[MarJay]

Could be air filter, sounds like its running a bit rich. Could also be that the oil pump is out of adjustment.

Try cleaning/replacing the air filter and see what happens...
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[hmmmnz]

it sounds like you are running rich for one reason or another,
you may have a leaf in the air box or a clogged filter,
go for a ride and then when you stop the bike, check the plugs, see if the plug is still black,
(clean it before the ride as well) (check and clean filter before you do that)
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[stinkwheel]

If it is actually oil, check the pump is set properly.

What sort fo 2-stroke oil are you using?

Also check you have the correct grade of sparkplug fitted (don't assume 'oh the garage fitted it so it's right', check).

If none of this or the above helps, try fitting one grade hotter sparkplug.

[tomhunter]

It is actually the wrong model of spark plug, still NGK tho and I tapped down the gap earlier today.

I'm gonna clean the filter and see if that makes a dif...

Is it standard practice to use air filter cleaning solution?

[stinkwheel]

Well, I'd strongly suggest you fit the correct sparkplug if it is oiling up and avoid further pissing about with it until you have done so.

NGK make literally hundreds, probably thousands of different sparkplugs, you need the right one. One heat grade out makes the difference between oiling up and not oiling up, even more so on a tiny wee engine like yours.

[MarJay]

[yambabe]

My other half wants to know why are you starting it and letting it idle, why are you not starting it and riding away on it?

And if you do start it and ride away on it does it still do it?
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