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Agree with doing both
Had a 115 Yamaha 4 stroke used. The previous owner did the hose flush through their fitting without running it it. When I did my 100 hour I was amazed at how much debris I found. Next 100 hours I did both the fitting and then the muffs and is was much better. Asked the mechanic, and his take on it was the fitting was for boats left in the water , and it was better to use the muffs.
I checked my 150 Yamaha 4 stroke manual and it says to flush the unit with their fitting and then at the end of this section it states "For cooling system flushing instructions see page 50".This shows how to do it with the muffs, though it is in a section for storing the motor. I continue to do both as the first can be done as the gear is being unloaded, then I power flush it when I'm done cleaning it out. If I'm lucky enough to have a water tap near the ramp I just power flush it there to save time.
Trent
08 215 CC -Simply Indestructible
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