do you sharpen your brand new blades?

Who ever told you that was having a lend of you.
If they needed to be any sharper they would sharpen them then put a guard over the edge like saw blades, plane blades & chisels .
I will take your word on it, I am no expert on the matter. I questioned the sharpness on a new set of Marbains and thats the answer I got.
 
As mentioned, a razor edge isn't what we want on a lawn mower blade. They are typically a little dull however and can be improved.

New blades should be checked for balance, straightness, and track. Any out of balance condition will rob horsepower and quality of cut.
 
Back
Top