Thoughts on shark tooth blades.

[38racing]

I have a lawnboy 4 cycle Tecumseh walk behind. I may not have the discharge chute so it's mulch or bag. I find a 'roughness' to it although I would not say a vibration. I checked the blade and it's a shark tooth on it. I looked it up and that appears how it was equipped as it's the only blade listed. Could that account for what I'm sensing. My supplier offers a regular blade that fits it.

[KE4AVB]

They wear so have you check the balance?