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  1. roger3645

    2 bladed prop to 3 blades

    I'm running a 1975 merc 85 hp (Still runs good) it has a 19 pitch 2 bladed prop. I want to change it to a 3 bladed prop. I read somewhere when adding an additional blade you should drop the pitch down. If so, I should drop down to a 17 pitch prop. Does this sound right to anyone else?
  2. roger3645

    2 bladed prop to 3 blades

    I'm running a 1975 merc 85 hp (Still runs good) it has a 19 pitch 2 bladed prop. I want to change it to a 3 bladed prop. I read somewhere when adding an additional blade you should drop the pitch down. If so, I should drop down to a 17 pitch prop. Does this sound right to anyone else?
  3. roger3645

    Flat Spot 850 Merc

    Have a 1975 850 85hp merc. At about half throttle the engine will start to bogg down an shut off unless I squeez the priming bulb. Then it will start to pickup speed and I can give it full throttle. I replaced the fuel pump last year.Any ideas on this one or should I just get a longer fuel line...
  4. roger3645

    Thunderbolt Tach hookup

    I have a 1975 850 mercury and have just picked up a vintage thunderbolt tachometer made in the same year as the motor. The control box has the tach plug with the brown black and white wire. I don't have the wire harness to just plug in the tach. I want to hard wire to the wires in the control...
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