Stihl ms260 cylinder

[Daniel VanMeveren]

Got a 260 the other day was told it was seized up. It was seized up it i got it unstuck was just curious if I should buy a new jug or if I can still use mine would like to stay with oem if possible I did run a home in the cylinder a little nothing catching thanks for your input this is on the exhaust port

 

[huskihl]

You need to remove the aluminum transfer to see if the plating has scoring in it. Don’t use a hone, especially to remove transfer

 

[Mad Professor]

There is still a lot of transfer around the ex port. You need to clean that off and see if there is any damage underneath it.

Good chance to will clean up fine. Easy to ruin a cylinder using a hone.

 

[stihltech]

NEVER HONE A CYLINDER! BUT---
You MUST break the glaze to get the rings to seat. A small spring loaded engine hone (and there is the problem, it could only remove any metal if you used it for an hour-maybe! t needs to be renamed for what it is a GLAZEBREAKER!)
Been doing this for many years. Remove the transfer as stated. Use something to break the glaze. If no gouges left when done, put a piston in it.
Don't forget to find the cause of the lean seize, or you will do it again. This would be a guaranteed vacuum and pressure test in my shop.

Yeah, I know, here come the 'maters.

 

[huskihl]

NEVER HONE A CYLINDER! BUT---
You MUST break the glaze to get the rings to seat. A small spring loaded engine hone (and there is the problem, it could only remove any metal if you used it for an hour-maybe! t needs to be renamed for what it is a GLAZEBREAKER!)
Been doing this for many years. Remove the transfer as stated. Use something to break the glaze. If no gouges left when done, put a piston in it.
Don't forget to find the cause of the lean seize, or you will do it again. This would be a guaranteed vacuum and pressure test in my shop.

Yeah, I know, here come the 'maters.

They’re great for what you said. In and out slowly and only for a few seconds. Most guys rattle them around trying to remove transfer or trying to crosshatch and end up removing all the plating from the port edges

 

[huskihl]

But emery paper in a mandrel or red/green scotchbrite will remove glazing as well

 

[Daniel VanMeveren]

NEVER HONE A CYLINDER! BUT---
You MUST break the glaze to get the rings to seat. A small spring loaded engine hone (and there is the problem, it could only remove any metal if you used it for an hour-maybe! t needs to be renamed for what it is a GLAZEBREAKER!)
Been doing this for many years. Remove the transfer as stated. Use something to break the glaze. If no gouges left when done, put a piston in it.
Don't forget to find the cause of the lean seize, or you will do it again. This would be a guaranteed vacuum and pressure test in my shop.

Yeah, I know, here come the 'maters.

Yeah was gonna do a full vac and pressure test on it bought it second hand with a seized engine so it getting new bearings seals and hoses just did a 441 new rings 150psi before start up tbink i only spent 30 seconds in the cylinder with a 3 stone hone feels real smooth now