Bought a property in Canada and there’s a like new one in the shed. Runs perfectly. Blade is beyond dull. What size blade fits this machine? Looking to cut brush. Any part numbers? They have them on amazon?Thx.
Generally there are 20mm and one inch holes in the center of the blades. Then there is the diameter.
I am not familiar with your model or make however it seems the largest Stihl blades I have pruchaced use the 20mm hole presumably so they do not get put on a smaller machine with the one inch arbor.
A FS66 has a 20cc 0.9 hp engine, which is a little too small to run a brush blade unless the the cover is sparse.
Then again if you're not in a hurry, it might still work for you.