Modern Vespa

Hey guys
I have a 2018 gts 250 yacht club edition


The area marked gets greasy when engine gets warm and running for about an hour

I dunno if it is oil leak or what, what do you think?

You wipe it clean before a ride, and when you return it's dirty again? It does sound like a leak, maybe a gasket isn't seated properly.

Keep in mind, I'm the furthest thing from a mechanic you'll find on MV, but I thought this deserved a bump.

I dont think it is because of a gasket or something

Much more like a very tiny teeny crack or hole in engine case ...

Have you tried to run it on the center stand and see where it's coming from? With no wind to push to oil around you might be able to discover the source.

It does not get dirty when running
Butttttt
After engine is warm and you shut it off, a certain spot gets greasy, no visual sign of crack or anything but clearly there is something there that it gets greasy

I actually think it is a micro-hole thing on engine case

What tool/material you think is btter for sealing it?

Sorry, I haven't a clue what would be best.

I'm hoping that greasy125 or some of our other more mechanically inclined types chime in with suggestions soon.

If there is another Vespa nearby it could be excitement...
Or... I see that a piece of metal is missing near a cooling fin, maybe a bump has damaged / cracked the crankcase.

Maybe I’m blind, but I can’t tell what area you’re referring to. You say it’s the “area marked”, but I don’t see a mark. Can you point it out?

Yeah my bad
Marked photo uploaded

There is a special paint in a spray can, that can detect cracks in cast materials. You clean the case, spray it and then wipe off the paint after acertain amount of time. A crack would show up as a bright red line.
I've seen it in metallurgy class 30 years ago. I have no idea who makes it.

I can have weicon leak detector, is that ok?

A cracked case is very rare. Much more likely is a porous case. But before you go off down that track even a porous case is quite rare. So...first make sure that oil is not leaking down or dripping down from a source well above where you are seeing it. An oil leak drip can find it's way down to the low point on an engine without leaving a trail low down because it gets taken there by the airflow rather than running down the engine case. So start checking much higher up on the engine. Around the cylinder head, cam cover, barrel etc. I've seen many "leaks" easily fixed because they have come from a loose cam cover or it's screws and the oil finds its way down to lower levels sometimes not leaving much of a trail until you start to look harder way up on the engine. Come back and let us know what you find, if anything.

Yeah, you are right, i am going to investigate it thoroughly
I was checking it today and i could find that some bolts on engine cover were kinda loose
Maybe the leak is becaae of a loose bolt of gasket or something will check it today and let you guys know

I'll hazard a guess that it's from the dipstick and leaking down or maybe, depending on mileage something in the evap that's just misting and rolling downhill.

they get nasty underneath. it happens. *shrugs*

Not gonna lie, I'd kill for my engines to be that grease free

Olive oil lowers cholesterol.

I dunno if that's olive oil. Doesn't taste quite right