Hey guys just got my brand new 2012 Z520 and 250SHO combo out on the water saturday. My question regarding the break in is that after my first two hours which the manual states I can then run the boat up to WOT for less than 5 minutes at a time do I need to keep my motor trimmed less than or equal to neutral. My dealer said that I shouldn't trim the motor higher that half way even at WOT during the 10 hr break in period. He said that this puts the motor under strain to help seat the rings he said basically keep the motor tucked. I have about 4 1/2 hrs on the motor and I have looked through the manual and it doesnt say anything about keeping the motor trimmed down or no more than neutral with the boat. By the way the hole shot and acceleration is unbelievable on this motor. I really wanna trim up the motor and see what the boat will do as far as top end speed goes. Thanks!
When I called the Yamaha tech support line they told me it was fine to trim it up in hours 3 - 10. The only thing they recomended was as long as it is safe stay over 4000 rpm's and keep the range 4000 to 6000. So if it is safe never run less then 3/4 speed for hours 3 - 10 this is what is needed to seat the rings. Drive it like you stole it and don't even think of ideling for the next 8 hours.
I would say you better go by what your dealer told you if he is going to do the warranty work. I think it is interesting that for everyone that posts on here about their SHO break in has a different story about how you do it. When I picked mine up he was able to tell me that he thought that prop I had him put on it was perfect because it will turn about 5900. So that ment that it had been run at WOT before it had two hours on it. He also told me that all four strokes would have a rising oil level during break in.So he told me to be easy on it until it had about five hours on it. Then you can run the heck out it and dont idle too much.
Do whatever it takes to heat the engine up and cool it down in repetitive cycles. Depending on water conditions distance etc etc trimming down can help to load the motor and keep the speed and rpms down.