Find out whether there is a 1/4 pitch spur sprocket available for your make and model of chainsaw:
Chainsaw Carving and related
How to change the sprocket on your Makita 5012b chainsaw
This is pretty lo-tech however it seems to work and the price is right.
Tips on using the Lancelot
Remember to only use with 4-1/2 grinders…with a constant pressure (paddle type) switch…you don’t want this to keep running if your hands slip and you’ve locked the trigger on.”
How to determine pitch and gauge of saw chain
How to determine the pitch and gauge of your saw chainWhen ordering saw chain the following information will assist us in matching the correct chain to your saw.
How do you know when the chain needs sharpened? The following guidelines can help:You have to apply pressure on the bar to cutYour saw kicks out more sawdust than wood chipsYou can see light reflections off the leading edges of the cutters