Re: Mercury Mark 25 Prop Adaptor

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January 26, 2018 at 7:05 pm #70237
mercuryman
Participant

    There is a problem using the adapter, its gear ratio. The Mark 25 is 13 : 24 and the KG7 is 16:21. At 4000 RPM the prop on KG7 is going a lot faster. Thats why they put a big 9.5 inch diameter on the Mark 25 its going slower.