What you have is common to all bendix type starters. Before mechanical shift fork type starters became an industry standard, all your automotive ring gears would have the same type of wear. Some are worse than others mostly due to metallurgy differences, but cam angles and teeth profiles also change how they operate.
Automotive starters have hardened teeth on the bendix pinion running against steel ring gears. Shift fork starters have positive engagement and work way better. The real problem with the bendix style is getting teeth engagement before the pinion is spinning too fast to mesh easily.
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2011 EC250E
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