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  1. C

    Prop selection

    I have a 1975 650 3 cyl. Believe it or not I lent the boat to my brother in law, thick or what, anyway now I need a new prop. :mad: My problem is I didn't have the forsight to measure the prop diameter before I sadly watched it roll out of my driveway. Now I don't know which prop to order...
  2. C

    1975 merc 650 timing, idle and WOT?

    I am not sure how to set up the timing, in the book, and on the engine it tells me that max timing advance is 23 degrees, however there is an adjustment for idle to max. I don't know what the idle adjust is supposed to be. On the power head it says ".125 degrees BTDC", and right under that it...
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