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As your boat is rated for a maximum of 150 hp, you can use the same Quick Engine Guide as the Outrage 18 uses.

http://www.whalercentral.com/readarti...ticle_id=6

The less weight the better but if you water ski, a 115 hp 4 stroke might not be enough for that model. I had a 115 hp 2 stroke and wouldn't want any less hole shot for any reason and a 115 hp 4 stroke would most likely give you less hole shot.