Reply To: 1958 Evinrude 10 hp Sportwin New Pinion Gear

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Try fitting the new pinion onto the shaft without the key in place. If it’s still too tight, polishing the shaft and gear might loosen it up. If it slides on easily without the key, the key will need to be either reset deeper or have its sharp corners rounded off slightly. These parts should fit snuggly but not too tightly.