Just seeing how many different theory's there are for breaking in a new power head? Thanks in advance!

ideal at the ramp 1st time for 30-45 minutes�.3-5 hours, 3,000 to 4,000 RPMs or less, open it up for 45 seconds every now and then

I'd go with the manufacturer's recommendations on breaking in a new motor. Same thing really.

Double oil and drive it like you stole it!!

Just kidding. Google the manufacturers recommendations.

Then drive it like you stole it!!

I was at plano marine and over heard the salemans tell a guy idle the first hour. He said then 1/4 throttle the next hour. 1/2 throttle the next 2 hours. 3/4 throttle next 2 hours and then full throttle for 45 seconds and back to nearly full throttle For the next 2 hours and then start pushing it a little more each time. He said anywhere from 10-12 hours breaking it in before letting her rip. Good excuse to go graph some areas at idle for a while.

Depends on motor. 4strokw versus 2stroke rings are different. The make rings seat correctly the motor needs to be heated up then brought back down in temperature.

Mercury PRO XS is a hot break in and doesn't want you idleing more then 5min at one time 4000-5400 first hour