Yamaha F25B, T25B ENGINE, BREAKING IN (RUNNING IN)

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EMU00224

BREAKING IN (RUNNING IN)ENGINE

Your new engine requires a period of break-in (running-in) to allow mating surfaces of moving parts to wear-in evenly. Correct break-in (running-in) will help ensure proper performance and longer engine life.

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Failure to follow the break-in (running-in) procedure may result in reduced engine life or even severe engine damage.

Break-in (running-in) time: 10 hours

EMU00233

Run the engine under load (in gear with a propeller installed) as follows.

1)For the first hour of operation:

Run the engine at 2,000 r/min or at approximately half throttle.

2)For the second hour of operation: Run the engine at 3,000 r/min or at approximately three-quarter throttle, and during this period run it at full throttle for approximately one minute every ten minutes.

3)For the next eight hours of operation: Avoid continuous operation at full throttle for more than five minutes at a time.

4)After these first 10 hours: Operate the engine normally.

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