Do you have to break in a new boat motor?

Since boat engines are designed to run at constant RPMs and are put under intense loads, it is very important to properly break in your motor. It is a very simple process that anyone can really do and we recommend that everyone with a new boat follow this break-in procedure that Yamaha recommends.

How long does it take to break-in a new boat motor?

The rule of thumb for most marine engines are 10 hours for the break-in period. Some inboards require more, like a 20-hour break in, but I think this could go back to the debate of the “break-in period myth.” So we will leave that there with what the manufacturers want, and say.

What happens if you don’t break-in an outboard motor?

Failure to follow the engine break‑in procedures can result in poor performance throughout the life of the engine and can cause engine damage.

Do you have to break in a lower unit?

Technically, a new gearcase should be broken in as if it were a new engine (for the first hour). Vary RPM’s, no need to “tuck trim” in this case. After 1 hour, normal operation. Change gear lube at 10-20 hours (Mercury or Quicksilver High Performance).

How many hours should a 4 stroke outboard last?

A typical two-stroke or four-stroke outboard engine should provide 1,500 hours of run time. Based on the average use of 200 hours per year, this will last 7-8 years. However, changing your oil every 50 hours of operation and regularly flushing the engine can see your outboard engine last 10 to 20 years.

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How do you break in a 2 stroke outboard?


Normally your Tohatsu outboard uses a 50:1 oil/fuel mixture (1 pint of oil for every 6 gallons of gas). During the break-in period you should use a 25:1 oil/fuel mixture (2 pints of oil for every 6 gallons of gas). See our oil/fuel chart for more info on the 50:1/25:1 ratios.

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