1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 176Get this manual

1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 176

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POWERHEAD
Care must be taken not to scratch the side surfaces of the ring grooveScratching the side surface of the ring groove will damage the ring groove1 Use bristle brush and carbon removal s