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Given the added weight of the 4 stroke, adding a jackplate is not necessarily wise.

Most likely the prior motor was mounted using the blind holes and not the BIA pattern.

Print out this article and give it to the installer. Note you should mount the engine at least 2 holes UP.

Mounting:

http://www.whalercentral.com/articles...icle_id=82

Engine Height:
http://www.whalercentral.com/articles...cle_id=106