Chain adjustment for 12” dime tip 1/4 pitch

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Oregon 25ap is rated for 38cc,. 13rm is a bit more robust. I would think on a small sized nose you could get a lot of heat. Probably as tight as possible without too much heat. Try starting with one or two scrench screwdriver thicknesses sag off the bottom, depends on length as well. Just guessing.
 
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