Yeah, the gears are "marred" but not missing teeth that I can see. From the pics, I don't know why they won't work. This is, after all, a lawn mower. You aren't going to be setting speed records with it. If those gears aren't missing teeth, I'd run them. That trans isn't worth much anyway, so if they do go ahead and chip, at the worst, you'll be back where you started.
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