New Yamaha F300's smoke at start up?

how do you keep the motor when not in use? trimmed down? up? whatever it is switch it and see if that makes a difference? that worked for my older yamaha 05'

Ragon210 said:

how do you keep the motor when not in use? trimmed down? up? whatever it is switch it and see if that makes a difference? that worked for my older yamaha 05'

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The boat is kept on a lift and out of the water with the motors trimmed all the way down. I will try that see how it works.

Bilbo said:

The boat is kept on a lift and out of the water with the motors trimmed all the way down. I will try that see how it works.

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Pretty sure there was a thread on here where someone explained that the Yamaha four strokes are meant to be stored trimmed up at some angle. If trimmed all the way down then you get smoke (from excess fuel or something?) is what I remember. So I agree, try trimming the motors differently when stored.


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That is exactly correct, the motors need to be trimmed over vertical, I prefer the top of the trim pins, and not just Yamahas, it is any four stroke outboard, except 7 marine engines,

Sequoiha said:

That is exactly correct, the motors need to be trimmed over vertical, I prefer the top of the trim pins, and not just Yamahas, it is any four stroke outboard, except 7 marine engines,

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Thank you guys for the suggestions! This makes sense! I will try this the next time Im down there and report back the results!

good luck! hope this solves the problem

Sequoiha said:

That is exactly correct, the motors need to be trimmed over vertical, I prefer the top of the trim pins, and not just Yamahas, it is any four stroke outboard, except 7 marine engines,

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Does it hurt the engines to sit when trimmed under or vertical rather than over? Or does it just produce a little smoke as discussed? Thanks


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Another reason to stay with 2 bangers.

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I have a 2011 honda bf200 no smoke ever in any position.

I have been trimming the motors to the top of the trim pins. NO smoke at all! Thanks for the advice guys! Be safe out there!