No announcement yet.

Yamaha 150 help

  • Filter
  • Time
  • Show
Clear All
new posts

  • Yamaha 150 help

    I have a neighbor with a deck boat and Yamaha 150. Out on the boat yesterday it did not want to stay at a higher rpm. Will max as 4k and then work down. Did not run smooth at all until about 3200. Annual service recently done to include spark plugs and other misc items.

    I was told there are some small fuel screens that form films on them and starve the fuel. Where do I find these? The water separator is new. Ethanol free fuel and fuel medics additive and the inline filters under the hood also cleaned and replaced. Thoughts
    [br]1984 Mako 224[br]1977 Mako 15[br]Clermont, Florida- [br] -Rewire[br] -Tank/Misc[br] - Aft Box removal

  • #2
    Is it fuel injected or carbed?? did he try the squeeze the ball trick to find any change??

    [br]1994 Mako 215 Dual console Optimax 225[br]1978 Mako 19 with 90hp johnson[br]1996 Mako 22[br]1982 Mako 171 Angler 135 Black Max Mercury[br]1987 21b 225 Yamaha[br]1974 23 inboard Gusto gone.[br]1979m21 225johnson \"blue dolphin\" bought off this board and restored [br]with everyone\'s help!!Gone but not Forgotten....[br]1979 20 Mako 115 Suzuki gone[br]1977 19 Mako 115 Johnson gone[br]1976 23 Mako twin 140 Johnsons gone[br]1983 224 with closed transom and bracket[br]And 162 SOB (some other boats)[br]Venice Florida, Traverse city Mi.


    • #3
      4 stroke fuel injection- Yes we would did the ball trick- though it would firm up it did not make any change in the engine.
      [br]1984 Mako 224[br]1977 Mako 15[br]Clermont, Florida- [br] -Rewire[br] -Tank/Misc[br] - Aft Box removal


      • #4
        David, New Kent, Va[br]

        [br]Project Thread:[br]


        • #5
          If you're not getting any alarms or codes its got to be fuel.

          I'd start by narrowing the issue down. Run the motor off a 5 gallon jug and take the boats fuel system out of the equation. Then you know if the motor has a restriction or the boats tank/vent/antisiphon/filter...
          [br]Michael R. Delgado[br]1972 Mako 22[br][br]1976 Mako 25[br],25[br]


          • #6
            That link that Dave posted is for an HPDI, but...I agree with Mike, check the simple things like fuel filters, then work your way up to injectors.
            1978 Mako 25 - Blind Hog
            1985 Mako 20c - sold
            Fort Walton Beach, FL