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  1. K

    Mercury 850 not running right

    Hello all, I seem to be having a problem with my Merc. It's a '75 Mercury 850 with Thunderbolt ignition, the problem I'm having is it runs fine but will not rev up past about 3400 rpm in the water, out of the water it will rev up past 4000 rpm. Any suggestions as what I should be looking for? I...
  2. K

    merc 850 info

    So I went to do a tune up on the boat('77 Larson Manta) and pulled the plug wires off(I actually PULLED them off) and found that they screw into the distributor..oops. The plug wires were the original ones so I was going to replace them anyway. I pulled the dist.cap off and found that the rotor...
  3. K

    Need info

    Long story short I bought a boat and it has a Mercury 850 with Thunderbolt ignition. It is a four cylinder and the serial number is 7063213, what I'm looking for is the year of the motor(just incase I need to order parts)... Thanks
  4. K

    New to me Larson

    Hello all, great site and nice boats. This is my first boat, other that the car topper I sold. My little family is getting old enough for camping(not just hiding in the shade with babies) and water sports, so I found myself a nice bow rider boat. From what I've found on the ID plate and off the...
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