New piston in old liped cylinder?

[Mcfly49]

I have an 028s and a new to me OEM cylinder that has a slight wear lip in it. Is there an easy way to ensure that the top ring on a new piston won't beat itself to death on the lip?

 

[huskihl]

I have an 028s and a new to me OEM cylinder that has a slight wear lip in it. Is there an easy way to ensure that the top ring on a new piston won't beat itself to death on the lip?

There shouldn’t be a lip. The plating is very thin but very hard. It’s probably carbon. Emery paper or red/green scotchbrite on a mandrel in a drill or rotory tool will clean it up.

 

[Mcfly49]

There shouldn’t be a lip. The plating is very thin but very hard. It’s probably carbon. Emery paper or red/green scotchbrite on a mandrel in a drill or rotory tool will clean I was hoping to use an oem cylinder, but I guess I will just try the farmertec. Thanks

Unfortunately carbon isn't shiny and doesn't take a crosshatch. I guess I'll just junk it and try the farmertec cylinder. Thanks

 

[bwalker]

Unfortunately carbon isn't shiny and doesn't take a crosshatch. I guess I'll just junk it and try the farmertec cylinder. Thanks

I've never seen a plated cylinder do that.
Got a pic per chance?

 

[Mcfly49]

I've never seen a plated cylinder do that.
Got a pic per chance?

I'm guessing the plating is worn through?

 

[Mcfly49]

A pic through the sparkplug hole. (That is remnants of 4 aught steel wool)

 

[huskihl]

I'm guessing the plating is worn through?

View attachment 976857

No kidding. I have never seen that in 5-600 cylinders that I’ve been into.

 

[Mcfly49]

No kidding. I have never seen that in 5-600 cylinders that I’ve been into.

I'd guess most saws seize up from neglect long before they wear out. Hopefully this Chinese cylinder will work out.

 

[Vintage Engine Repairs]

And just to confirm is says “Mahle” on the cylinder? Or KS?

 

[Mcfly49]

And just to confirm is says “Mahle” on the cylinder? Or KS?

I didn't get it cleaned up to look until now, and it looks like I was scammed. Has c and an n5 on top, and a funny looking dollar sign and 97974a. This probably explains why it is worn out.

 

[huskihl]

I didn't get it cleaned up to look until now, and it looks like I was scammed. Has c and an n5 on top, and a funny looking dollar sign and 97974a. This probably explains why it is worn out.

Pics of the funny looking $? That’s probably a Kolbenchmidt

 

[Mcfly49]

Pics of the funny looking $? That’s probably a Kolbenchmidt

It is an elongated S with a K in it. Its much easier to ID when you know what you're looking for.

 

[Mcfly49]

I think I'm officially getting old. I can't find my new piston anywhere, and I'm beginning to wonder if I already installed it. Jeez

 

[Vintage Engine Repairs]

The KS symbol (one letter over another) is genuine oem. It’s that make that Husk said above that I can’t spell or say!

 

[pioneerguy600]

The KS symbol (one letter over another) is genuine oem. It’s that make that Husk said above that I can’t spell or say!

Lol, even huskihl spelled it wrong so you are not alone, its Kolbenschmidt.

 

[pioneerguy600]

Pics of the funny looking $? That’s probably a Kolbenchmidt

Well it likely is, LOL

 

[Mcfly49]

Lol, even huskihl spelled it wrong so you are not alone, its Kolbenschmidt.

It was close enough Google knew what he meant. That's a win in my book.

 

[pioneerguy600]

It was close enough Google knew what he meant. That's a win in my book.

We all know what it is so its all in good fun between us. That cylinder of yours is an oddity, I have torn down and repaired many dozens of 028`s and not seen anything like that.

 

[Mcfly49]

We all know what it is so its all in good fun between us. That cylinder of yours is an oddity, I have torn down and repaired many dozens of 028`s and not seen anything like that.

Surely one of those was not worth the trouble and you'd be happy to send me a cylinder....

 

[pioneerguy600]

I have yet to see an 028 wear out, the most common damage I have seen to P&C`s were straight gassed or terribly lean conditions take out the p &c . Sometimes they would clean up and could be reused, the odd one was ruined , deeply scored mostly ones ran lean for too long, rings broke etc. We used to be able to get Tecomec kits that were made in Italy, they made great replacement units but lately their quality dropped a lot, made in China I hear but I no longer use them. These days its OEM or nothing for me as the AM parts have been too hit or miss quality wise, one kit may be fine/usable while the very next one would be terrible, just not worth my time and reputation to use them for repair work.