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Tim - You are right to question. My information came from a 5 year old thread involving 3 members who I trust.

Your results with the 13.25x 15 is interesting since I have read the recommendation to be one size larger (13.25 x 17) Is it possible we are discussing two different motors.

Does your F70 have a WOT rpm of 5300-6300 and gear ratio of 2.33?

Honestly, trust Tim's information since he has the actual results.

Sailor - For your sake, please review this thread on a recent sales experience. While it is not the same brand/model of motor, read the posts on mounting height and prop recommendations and then what the installer said/did.

http://www.whalercentral.com/forum/vi...rowstart=0