Ec250 cylinder damage

[blamir]

Hello guys
We removed cylinder right now and it seems there is a damege on it. Could you look at the picture please.
Ec250 2012 200hours with stock piston. Yes it is stock.

 

[john r b]

200hrs is a lot to ask of a piston, but the cylinder does not look to bad.
Any other photos? what pre-mix are you using?

 

[Jakobi]

200hrs on a 250 is pushing it. I pulled a top ring out at .9mm at 110hrs on mine.

As for the cylinder, such is the price you pay. By leaving the piston and rings go so long it allows the piston to rock in the cylinder a bit. I'm betting the piston has some decent wear on the skirts.

In saying that, it also appears the clylinder hasn't been cleaned at all yet, so before you draw too many conclusions get a scotchbrite pad and some carb cleaner and give the cylinder a good deglazing. I'd then suggest measuring the ring end at several depths in the bore, or having a shop spec it up with a bore gauge.

 

[blamir]

Hello,
50:1 premix we used but dont know what previous user used.

More photo,

 

[Neil E.]

Are those scratches you can catch your fingernail in? They look more like shiny spots from scuffing.

 

[Wimpy525]

Send it out to Powerseal USA, tell them to check and measure if its in speck they ship it back to you. If it needs to be re-plated you looking at about 200.
They do quality work and have a real good turn around time.

 

[Zman]

It may also clean up with a diamond hone job for $25 to $30.

 

[jostby]

Are those scratches you can catch your fingernail in? They look more like shiny spots from scuffing.

I agree. Visual is OK but if you can feel the scratches with your fingernail it's time to have the cylinder repaired.

 

[blamir]

We are at Turkey guys. Not possible to send it anywhere in US. This is my friends bike. I persuade him to change piston. Rings is not in good condition. Rings wearing are so much. Piston is full black I will try to send a few photos of piston and rings.

I can not feel any deep, when i use fingernail.

Thanks.

 

[Zman]

If you are stuck and need to just get it going without cylinder work, I would Clean up the cylinder with a Scotchbrite pad, wash it well and put in a new piston and rings. If it has any perceivable ridge at the top of the bore, make sure you use at least the same thickness base gasket so the new rings don't run into the ridge.

 

[blamir]

New images. I hope cleaning cylinder save us .

 

[Jakobi]

Any pictures of the piston dome (including underside)?

With the pictures of the piston it does look like some scoring. Can you feel these marks with a finger nail?

 

[blamir]

I asked to my friend. He tells that he can feel 1 scretch on cylinder under side after cleaning.

 

[Lincolnlock]

It looks like it's been hot a few times, and it's seen a bit of dirt of the years. I would just measure the cylinder bore, order the correct oversize piston if it even needs one, clean up the power valve and put it back together. If you're super worried about it, send off the cylinder to be replated. I've run cylinders for years and years that looked much worse than that.

 

[Ud_luz]

I agree, the cylinder looks serviceable.