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Upper gears question

yamaha33166

New member
I purchased a used outdrive. I

I purchased a used outdrive. Its serial number tells me it is a '91 to '97 outdrive. The top cover has the large bearing race along with the large bearing on the shaft that tells me it is a '91 to '97. I pressed the gears from the shaft yesterday and noticed they are slightly different from the new kit that I purchased. After some research it looks like the gears i pressed off are from '98 and up. The gears i purchased new are '91 to '97 which are the correct ones for this drive.

So my question is are the '91 to '97 gears interchangeable with the '98 and above gears? It seems to me that someone worked on this outdrive previously and put in a newer ('98 and up) set of gears.

Thanks in advance.
 
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