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Yamaha F300 operation and maintenance from owners

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Yamaha F300 operation and maintenance from owners

Old 06-11-2021, 07:13 AM
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Default Yamaha F300 operation and maintenance from owners

I should be closing on a boat with twin 2019 Yamaha F300s in the next couple weeks. My last boat had Verados and I knew everything I could about them. I am looking for some input from current or previous owners with Yamaha 300s regarding normal operating parameters, any common issues, and maintenance. For instance, I knew the verados should easily hit 5800-6200 rpm wot if they were working as they should be and I ran them in that range at least once every time out to make sure there were no issues and when they did not reach those rpms I started checking plugs, coils etc and found the problem, when there was one. Also flushing the motors via the flush port with the motors off. Just looking for similar things for the Yamahas. Thanks!

Last edited by rmrider03; 06-11-2021 at 11:10 AM.
Old 06-11-2021, 01:32 PM
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No different except max rpm is 6000 and recommended range by Yamaha is 5000-6000 at wot.
Old 06-11-2021, 01:37 PM
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I’m running 5900 and I don’t baby it. But I look after it. Flush as soon as it comes out the water or as soon as it’s turned off in the slip. If I run it out of the water I use muffs and the quick hose connector
Old 06-13-2021, 08:07 AM
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I am relatively new owner of 2016 F300. So I have been trying to educate myself on the peculiarities of the 300. I am far from an expert, just a longtime boat owner. The 300s are vulnerable to making oil. Meaning gas is getting in the crankcase. I run Yamaha ring free with every fill up. On second season with the boat and no oil making yet. I am told it is an interference motor. That was a new one for me but apparently an interference motor relies on timing to keep the valves from hitting the piston. So the timing belt is very important, thus keep an eye on it and if it starting to fray or shedding a lot of dust replace it promptly. I am also told that 300s are very voltage sensitive. I don’t know if that applies to all modern outboards. Otherwise the 300s have a good reputation.

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