Chainsaw Repair

I have a red Craftsman 1.9 branded Poulan XX-D that's set up with 1/4" chain.  Little bugger pulls it very well, and is a well balanced saw.  I'm sorting out some oiler issues, and then I'll put a dime tip carving bar on it with some Oregon 25AP.

Also have a few 1/4" pitch sprockets for the XXV series saws, and will probably set up one of my XXV's (probably my Craftsman red 1.9A branded 25D) with 1/4".  They'll be fun to do some carving with. 

I could have gotten a partial roll of Oregon 25 (somewhere between 50 and 100' on an OLD 100' reel) for $50 at an estate sale a while back.  Was already blowing all the cash I had on hand on other stuff (including a box full of carb diaphragms, a Husky 2100CD crankcase and starter, and approximately 46' of Oregon .404-.063 skip square chisel chain), and had to leave the 1/4" stuff on the shelf (along with a partial reel of .325 pitch chain and a NICE Echo CS302S).  I went back later with more green, and all the stuff I'd left behind was gone....

The first Poulan s-25 I bought in maybe 1974-75 had 1/4" chain which I filed with a 5/32 file .The original was either semi chisel or chipper .

Somewhere in that time period Oregon made round chisel in 1/4" both full comp and skip and would that little saw ever cut using that chain .Ralph Nadar was instrimental in taking it off the market claiming it posed a danger to the owners who were not professionals because it had no anti kick backs .

I get the need for a small bite chain that was more cost-effective to manufacture, but I would have thought of .325 as the 'next step up' in pitch, instead of .375.

But that's just me. I also don't get why STIHL supplies smaller output 16" saws with heavier gauge .063 chain and higher output 25" saws with lighter gauge .050 chain.

Philbert

2 of the saws I just got come with stihl 1/4" and one I dont know what it is and has a O on the preset and 25 on the drive link.

1/4" 9T rims.

So what was the file size for these?  I cant recall off hand. 1/8" ?

Thanks save me from having to se if I had 1/8" still from back when I played scratching on chains.

I was thinking the one with O and 25 might be Oregon 25 last night.   https://www.oregonproducts.com/pro/AppGuideMoreInfo.htm

Dont think this is AP. Dont recall the extra dorsal fin beside the rakers.