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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc.


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  #1  
Old 03-03-2015, 02:23 PM
blamir blamir is offline
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Default 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.




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Old 03-03-2015, 02:51 PM
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john r b john r b is offline
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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?
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Old 03-03-2015, 04:59 PM
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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.
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Old 03-03-2015, 05:04 PM
blamir blamir is offline
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Hello,
50:1 premix we used but dont know what previous user used.

More photo,




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Old 03-03-2015, 05:32 PM
Neil E. Neil E. is offline
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Are those scratches you can catch your fingernail in? They look more like shiny spots from scuffing.
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Old 03-03-2015, 06:24 PM
Wimpy525 Wimpy525 is offline
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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.
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Old 03-03-2015, 06:42 PM
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It may also clean up with a diamond hone job for $25 to $30.
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Old 03-03-2015, 08:17 PM
jostby jostby is offline
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Quote:
Originally Posted by Neil E. View Post
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.
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Old 03-04-2015, 06:42 AM
blamir blamir is offline
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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.
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Old 03-04-2015, 07:21 AM
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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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