First of all, congratulations on your purchase. I think you will be very happy with the 90. It is a nice motor. I hope that the dealer propped it correctly. You should see 6000 - 6200 at full throttle.
Your question is the very reason we always put the full two hours of breakin on an engine before it leaves the dealership. It takes a little more time, but it removes all the guess work. I think very few dealers do that...and it is not something that Honda asks the dealer to do. Fortunately, we have a couple good customers, who are excellant boater, that volunteer to "take a two hour boat ride" and not only brake in the motor but double check the rest of the functions of the boat. We then join them for the last part to make sure it is propped correctly.
Follow the breakin procedure that is in the owner's manual. It should be on page 51.
http://marine.honda.com/pdf/manuals/00X31ZY96210KIT.pdf
Forget what you see in the Seloc manual.
The first two hours are what you have to pay the most attention to. If the dealer has already put .7 hours on it, you only have about 1/2 hour of running it between 2000 and 3000 rpm.
Then for the next hour vary it between 4000 and 5000 rpm.
Do not do a lot of idling during this hour and a half. It will be better to run it hard than easy to help set the rings.
After that...for the next 8 hours just do not run it at full throttle for more than 5 minutes at a time. Once again, do not baby it. It will break in better if you give it a good workout.
One other thing, if you have a good relationship with your dealer, they are an excellant resource for any question.
Have fun with your new motor.
Mike