Some time this week I receive my T8 Yamaha. I was told to "break in" my engine for 20 hours and then bring it back to the dealership. They also said to drive it hard and vary my speed... have you (ifishers) been required to do this process?
When I got mine they said just don't run it a low speed or real high speed for very long at one time. 5 Min. The 20 hour check up is optional. read your warranty card for more info. I change the oil every 4 months rather it's been run much or not. Maybe 10 to 15 hours in between.
I've had mine for 18 months and love it. Starts with the push of a button everytime. I think I pull started it onec or twice just fr the fun of it.
The break-in in a tank does not put the motor under a load which is what they told me they want done. I just went through this with Yamaha when I called them because the dealer and the mechanic that fixed the fly wheel that was not put on properly told me. Drive it hard for 10 hrs. Run it at full throttle for 5 to 10 minuts then back off to 3/4 throttle or so for the same and repeat. It is the only way the Yamaha T-8 seats the rings and valves. They said.
The only problem thay have had with this motor is scoring of the cylinders because of the motor not being broke in this way.
I called every dealer in Oregon and eveyone told me break it in hard and none of them said they break them in for the customer which was my complaint. I did not want to spend 10 hrs of my time running my boat up and down the river breaking in a motor I bought to use.
Yamaha said basicaly oh well and "we give no tech support to anyone but dealers". After raising hell they did talk to someone who said run it hard to break it in but gave no answer as to why one has to spend so much time doing it. They said DO NOT TROLL with it until you break it in.