I bought Oregon OR4125-316A Grinding Wheel 3/16 Inch
I just used saw yesterday, sharpened with original HF wheel....and did rakers....man it cuts Very Well.
I dont understand why the HF grinder has so much hate.
It gives a flat cut surface, I dont know if thats considered a square cut, but it cuts great. Yea, the original wheel doesnt give the smoothest finish. I will try the oregon wheel.
I also dont see why a bigger motor is needed. Its just kissing the teeth, unless your chain is really mangled.....but even so, mine doesnt have a issue. I dont try to lug it down though.
The smaller saw I used, echo cs370 16" uses a rounded tooth oregon chain.
My echo cs590 uses a 20" square tooth chain. That sucker really cuts......and yes the chains arent perfect when new.
I am still learning about chains. As simple as it appears, its pretty technical if you want to cut better and easier.