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-   -   Ec250 cylinder damage (http://www.gasgasrider.org/forum/showthread.php?t=19206)

blamir 03-03-2015 02:23 PM

Ec250 cylinder damage
 
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.


http://s4.postimg.org/c0147yn31/20150303_215959.jpg

john r b 03-03-2015 02:51 PM

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 03-03-2015 04:59 PM

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 03-03-2015 05:04 PM

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

More photo,
http://s22.postimg.org/6v3o68h8h/20150304_003207_1.jpg

http://s7.postimg.org/bfll424p7/20150304_003146_1.jpg

http://s18.postimg.org/3zwsf0p3t/20150304_003207_1.jpg

Neil E. 03-03-2015 05:32 PM

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

Wimpy525 03-03-2015 06:24 PM

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 03-03-2015 06:42 PM

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

jostby 03-03-2015 08:17 PM

Quote:

Originally Posted by Neil E. (Post 149257)
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 03-04-2015 06:42 AM

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 03-04-2015 07:21 AM

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.


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