Is this cylinder usable

[kyle121990]

I was just hoping for a couple opinions of if this cylinder was still usable. You can see the hole in the cylinder wall in the picture. From what I read if the blemishes are below the exhaust port it's ok? So location of the damage is important? Any advice is appreciated
Kyle

 

[Ozhoo]

You'll wanna clean it up with a burr grinder, but yes you can run it. Defects below the exhaust port don't effect compression but anywhere that the rings pass over needs to be smooth.

 

[kyle121990]

Ok cool so any blemish below the top of the exhaust port is ok as long as it doesn't catch a ring?

 

[BuckthornBonnie]

I wouldn't say "any" and I wouldn't say "ok. " The piston still travels areas below exhaust so anything sharp/raised or plating loss is a problem.

But, it's better to have problems below vs. above.

 

[HarleyT]

But, it's better to have problems below vs. above.

Well..............

 

[BuckthornBonnie]

Well..............

I had a problem down below once...
Lots of burning.

 

[BuckthornBonnie]

I had a problem down below once...
Lots of burning.

And itching.

 

[HarleyT]

Try some synthetic lotion....

 

[BuckthornBonnie]

Try some synthetic lotion....

Makes sense. Ill try it out next time.

 

[blsnelling]

I suspect that's been there since it was new. I would leave it as is.

 

[kyle121990]

Ya that's kind of what I was thinking. It was smooth when I took the cylinder off. Thanks

 

[Big_Wood]

I suspect that's been there since it was new. I would leave it as is.

my first thought as well, the exhaust side cylinder wall is another story though and appears to be quite crispy in need of some clean up.

 

[kyle121990]

Yes crispy indeed cleaned up good though

 

[Thommo]

I would be more worried about that hole causing a vacuum leak. Its a bit hard for me to tell just how deep it is.

 

[blsnelling]

The casting is really thick at that point. That looks to me like a really shallow casting pore. I would not be concerned.

 

[jmssaws]

I would check and see if the bottom ring is on it at bdc.

 

[blsnelling]

I would check and see if the bottom ring is on it at bdc.

How would that matter?

 

[jmssaws]

How would that matter?

Because there's a ring end right there .

 

[jmssaws]

How big is the void under the plating?
How thick is the plating over it?
It would be a bad spot if it grew.

 

[blsnelling]

Because there's a ring end right there .

That's under the transfer, well away from the ring end.

How big is the void under the plating?
How thick is the plating over it?
It would be a bad spot if it grew.

That's a used cylinder. If it were going to grow, I think it would have already done that, or there would at least be signs of it.

I think many of you are looking for trouble where there is none. That's a factory defect that hasn't hurt a thing. If you've cleaned up the scoring, throw a new piston in there and run it.