I am about to purchase a Hydra-Sports 202DC with a Yamaha F150 4
stroke.
I have read the beak-in procedure.
1hr at 2000 rpm , 1hr at 3000 and the next 8 hrs no full throttle for
more than 5 mins.

My question is; When pre-purchase water testing, how much or little
damage is sustained while the sales guy or I run a new motor at full
throttle for a few minutes to see full speed and other handling
characteristics of the boat