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Way too much pitch. You need a 14x9p or 14x10p. Probably the latter.i have a new 20 sli with 70 4 stroke. 13 pitch prop. cant get over 3800 rpm.
Hi there...dealer prep includes propping the boat correctly according to altitude, etc. Please speak with them for advice! Performance bulletins can be found on the website under Our Company, Performance. They are performed by the engine companies and we see that the 20SLi with an F70 Yamaha was tested with a 13 3/8 by 13 aluminum prop. Good luck, propping is an art, not a science! TBi have a new 20 sli with 70 4 stroke. 13 pitch prop. cant get over 3800 rpm.