MS261c-m ring end gap

[morbius18]

I posted this in the chainsaw forum. I didn't realize there was a thread for saw building:

I tore my ms261 c-m apart to remove the base gasket, re-ring and advance the timing. I've got a set of cabers, and was checking the gap. It's .004". That seems really, really small. The OEM rings are .008" gap. Compression was roughly 150ish prior to teardow.

.004" I've never ran into one with a gap that small. Has anyone ran into cabers being this small?

Caber is bottom ring, used OEM is top ring



I've got good gap around the pin, should I file the end of the caber? .008 on the used OEM is pretty good, should I just reuse those instead?

 

[cuinrearview]

That looks like a lot bigger difference than .004 between them to me.

 

[morbius18]

That looks like a lot bigger difference than .004 between them to me.

I went and re-measured. You are correct, it was .010", not .008". I did notice something interesting though, it's hard to see with the naked eye, but with a flash, it appears the cabers are tapered. Wider from inside to outside (from cylinder center).



At anyrate, I'm just going to file the cabers gap to .008 or so.