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  1. M

    91 135 ignition switch problem

    I had switchbox problems before on one motor and replaced both switchboxes, motor runs fine now. My other motor is beginning to lose fire on 2,4,6 in the low rpm range. I put one of the old switchboxes on and it worked for a couple of days, then I had to put the other old switchbox on it works...
  2. M

    91 merc 135 carbs/floats

    twin V-6 135's.when pumping my fuel bulbs they don't seem to get "hard". Is this due to floats sticking? Motors seem to run and idle ok but one studders a bit around the low end when accelerating. How difficult is the overhaul of the carbs, I've heard bad things but I consider myself to be...
  3. M

    Merc 135(1991) Switchbox/flywheel.

    Heres a few things I found in the past.<br />1. Switchbox problem<br />- Symptoms<br />--- Intermittent loss of spark on one bank <br /> progressing to total loss on that bank.<br />--- Found loose/corroded ground on one of the<br /> switchboxes and repaired it. No help.<br />---...
  4. M

    Merc 135 twins

    I have another thread on here refering to some problems I've had but I also have a question about running the twin set-up. Does it do any good to try and stagger the throttle settings once on plane? I notice that when I get on plane and back the throttles back to half, if I then back one off a...
  5. M

    91 135HP POWER QUESTIONS/ PROBLEMS

    I have a 24 foot CC with twin 91 135's and I think I may be having trouble with both of them.<br />The boat weighs around 4500lbs(in theory)and will run about 43 mph on 17p props. Last year one motor would get it on plane but this year don't seem to have the power. They both sound the same and...
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