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Yamaha F300 Cutting out above idle speed

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Yamaha F300 Cutting out above idle speed

Old 06-11-2021, 07:15 AM
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Default Yamaha F300 Cutting out above idle speed

I have a new Yamaha F300 that has 17 hours on it. It runs fine at idle speed but once I start to get above 3K it will sporadically cut out. Usually its been doing it only once a trip although last night it did it 4 or 5 times. Once it cuts out (almost like it turns off - no fuss or bogging down) it will easily fire right back up like nothing happened. I checked all negative batt connections as that seems to be the common culprit in my thread searches but they all were snug and looked good. No codes that I can see through the Yamaha/ Garmin interface. I pulled the fuel filter - that looks OK. When it cuts out the primer bulb is full of fuel. Other motor runs fine and doesnt have this issue.

The only thing I can think of is when I purchased this boat the dealer was supposed to fill it with fuel. They did not yet the gauges read full. Alas I ran out of fuel. It has seemed to happen ever since then.

Boat is a Scout 305 LXF.
Old 06-11-2021, 08:05 AM
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Does anyone know if Yamaha has a tech line? The boat goes in for its 20 HOUR Service next week but I want to see if I can rectify the issue in order to use it this weekend.
Old 06-11-2021, 11:54 AM
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Try to narrow down the cause.

connect to a portable fuel tank. If it runs fine, you have a fuel delivery issue with the boat. If it continues to give problems, then it’s likely with the motor.
Old 06-11-2021, 12:24 PM
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Check the connections behind the battery switch.
Old 06-14-2021, 07:48 AM
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Sometimes the problems eventually reveal themselves. After checking all wires and all of them feeling tight, I ran the boat over the weekend. At the end of the day after anchored, went the raise the port motor and it started to trim up and stopped. Motor wouldnt turn. Finally determined it was def battery/wiring related. And then I was able to find the loose wire - positive lead to motor. Which is weird because it felt very tight before but maybe it was pinched just enough to feel that way. Happy it was an easy fix.

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