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Sounds like you have too much oil in her. Yamaha is kinda strange. Yamaha four strokes are full of oil when it is half way between the two lines on the dip stick. If you are above the top line then you have way too much oil in it. We have had this problem before and use a file to mark the dip stick on all the Yamaha four strokes we sell or service so the customer will know not to over fill. Hope this helps!
Todd Johnson
Grubbs Marine
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