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Message: <blockquote data-quote="rotus623" data-source="post: 427173" data-attributes="member: 15266">Man you guys are really on the ball here.So, the motor serial number brings us to a 60hp EFI. No jet under parts breakdown. Plus the sticker said 60 on the cowling. So the motor has certainly been converted. Here's the fun part. The serial number on the pump is an AG, which was the same one on my short shaft 2 stroke 60/40. So I am guessing the guy who converted this just changed out the driveshaft for a 20".All that being discovered, I am nearly positive that my impeller is the old 2 stroke style. (I guess that means it's aluminum?)  how many rpms does one typically gain by moving to the stainless back cut impeller? What do one of those bad boys run new?</blockquote>