F70A WOT RPM Range

[juror81!]

First post to the forum hope to get some help with a quick question. The Yamaha manufacture spec for the engine F70A for WOT is at 5300-6300. It is recommended in the engine user manual that RPM should run in the mid to high range of this so anywhere from 5800 RPM on up to 6300. I am only getting about 5300-5400 running a 13 x 13 propeller. Will this harm my engine in the long run since I am not able to reach the mid to high range when running WOT?

[99yam40]

lugging motor will probably cause it to make oil.

Might look at this site to see what a set up like yours should do and what prop they used Performance Bulletins | Yamaha Outboards