The ms250 has a 6 tooth spur and 7 tooth rim drive available from Stihl for the 3/8lp or picco that is found on an Echo cs400.I have an echo cs400 and I'm trying to get a ms250 run the same bar and chain so I only need to stock 1 type
I managed a 'fleet' of chainsaws several years back. Cleared out all of the non-STIHL saws, just for uniformity of parts, training, etc. Still had a range from MS021 (16") to MS066 (36"). Looked at standardizing some of the chains, at the cost of changing the bars, the limited benefit from buying chains in rolls, etc., and just decided to live with the variety.
Often cheaper to buy loops on sale than to buy rolls and make your own. That said, I go to great lengths to maintain / repair / rehabilitate chains and get all the life out of them that I can.
https://www.arboristsite.com/community/threads/philberts-chain-salvage-challenge.245369/
Philbert
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