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    67 merc thunderbolt 650 2 fuel pumps same kit?

    Why do some 650s have only one fuel pump and others have 2? And are they The same rebuild kit?
  2. G

    67 merc thunderbolt 650 Boggs under load

    I have a 1967 merc thunderbolt 650 on a 73 Glastron v-140 trihull rated for up to a 70hp. It has a 15 pitch prop, New spark plugs, 119psi across all 4 cylinders and carbs cleaned last year. When I'm in the boat alone it gets up on plane like it should and reaches speeds of 28mph (gps). As soon...
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