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I just bought a 1985 150 merc blackmax.
The motor runs a little rough at different rpms and speeds up and slows down without touching the throttle.
The boat rips out of the hole and jumps to a plain but at full throttle the motor breaks up if i back down a little it clears up back down a little more it breaks up back down a little more clears up again.
It acts the same way increasing the throttle at a slow rate.
I have replaced the plugs, rebuilt the carbs and adjusted the timing
Im not sure where to look next anyone have a clue?
The motor runs a little rough at different rpms and speeds up and slows down without touching the throttle.
The boat rips out of the hole and jumps to a plain but at full throttle the motor breaks up if i back down a little it clears up back down a little more it breaks up back down a little more clears up again.
It acts the same way increasing the throttle at a slow rate.
I have replaced the plugs, rebuilt the carbs and adjusted the timing
Im not sure where to look next anyone have a clue?
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