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  1. J

    Yamaha 6SH

    Trying to get this motor ready for running. I think its an 1987 not sure. Has not been used for 8+ years. Its super clean inside and out. - I need to replace the fuel line (primer bulb, etc) as they do not look too good. Maybe even the portable metal fuel tank. - Replaced the spark plugs...
  2. J

    Water in fuel ?

    Does this sound like water in the fuel or something else? Motor is pulsing periodically - every 20 seconds or so. It runs fine and strong, but there is slight drop of about 100 RPM's for 1-2 seconds then goes right back. I have been out 3 times so far this year, the first 2 outings had no...
  3. J

    87 150 Black Max

    Help my baby is not well. :( <br /><br />Motor has been running fine up until today. Today I went to take her out and although it fire up just fine, it will not hold idle. <br /><br />I have to rev it up over 1000rpm to keep it running.<br />As soon as I drop the rpm's it stalls.<br /><br...
  4. J

    Rectifier or Regulator ?

    87' 150 Black Max<br /><br />Putting out HIGH voltage - over 16.6 volts. This is making my electronics very unhappy.<br /><br />After running the boat for a few minutes, the voltage starts climbing quickly. As soon as I throtle back to idle the voltage drops back to a 'normal' level.<br /><br...
  5. J

    Fuel gauge ??

    Having some problems with the fuel gauge.<br /><br />I thought the old one was bad, so I replaced it and still get the same/similar problem.<br /><br />The gauge does not go all the way up when the tank is full, nor does it go all the way down when empty (which worries me more).<br /><br />Any...
  6. J

    Fuel gauge ??

    Having some problems with the fuel gauge.<br /><br />I thought the old one was bad, so I replaced it and still get the same/similar problem.<br /><br />The gauge does not go all the way up when the tank is full, nor does it go all the way down when empty (which worries me more).<br /><br />Any...
  7. J

    No Thermostat ?? Is it possible ??

    87' 150 BlackMax<br />Been having occassional alarm go off. So I started doing some investigation. I bought this boat used, and it runs fine usually except for the alarm kicking in sporadically.<br /><br />The impeller kit was replaced this spring, and I'm getting a solid stream of water from...
  8. J

    Strange Alarm

    87' Merc BlackMax 150<br /><br />Sorry to post another engine alarm question, but I searched for this and could not find a similar post.<br /><br />My issue: Sporadic engine alarm. The motor is running nicley (all RPM ranges)- same amount of smoke as always, nice strong 'pisser', no power or...
  9. J

    Steam coming out ??

    I have an 87' 150 Merc BlackMax - which is running well (knock on wood). She idles fine, runs hard fine no other issues. <br /><br />When running (at any stage), I notice what appears to be steam comming out of the back. Definetely not the oil smoke. Temp outside (weather) does not seem to make...
  10. J

    Alarm - Help!

    My 87 Merc 150 is now setting off alarms.<br /><br />When I put it away for the winter, she was running perfect. Last week I took her out. I started getting a very light beep almost a scratching sound. Once I got the revs up it stoped. But then periodically started again.<br /><br />Today I...
  11. J

    Selecting the right impeller - Help

    Going to replace the impeller on my 87' Merc 150 Black Max SN# 0B219598. <br /><br />Its working 'OK' but I use this in Saltwater alot (I flush after every use). The last owner said he had it done before I bought it 2 years ago. I would take to a mech, but I like to do this stuff myself and...
  12. J

    Help - replacement Panel for Gauge cluster

    I'm upgrading my boat's gauges. They are mounted into a panel thats about 12" wide X 14" high & about 1/8" thick - wood grain hard plastic (I think/laminate). The panel is then held in place in the console by 6 SS screws all under a clear plastic splash gaurd. <br /><br />The gauges are easy...
  13. J

    Cleaning the motor - inside the cowling

    I have 150 Merc and it runs fine. The only problem - is that when you take the cowly (cover?) off, the motor is not nice and clean looking (like a new one). <br /><br />Is there any product/method I can use to clean it up and make it look nice and clean? Or am I asking for trouble?<br /><br...
  14. J

    Merc Shaft length ?

    Looking to repower. I currently have an 87' Black Max (Model 1150746 - SN 0B219598). How can I tell the shaft length 20", 25" (where do you measure from)?<br /><br />Boat is rated for 225 (max HP). I'm thinking of going up to a 175 or 200. <br /><br />Any advise is appreciated.<br /><br...
  15. J

    Trim & Fuel Gauges not working 87' Merc

    I have an 87' Grady-White w/ 87' Merc 150 Black Max. All original parts (still).<br /><br />I put her away for the winter, but now I'm looking to start getting her ready for the spring.<br /><br />1) The trim (tilt ?)gauge stopped working during the summer. The trim works fine (motor moves...
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