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  1. J

    Charging Question

    Hello everyone! I have a question about my charging system. The motor I have uses an alternator. I noticed that my batteries are being drained, and not being charged back up again. I tested the battery with the engine off and the output is normal (12-12.5V), and it is roughly the same output...
  2. J

    Motor Specs.

    G'day folks. I've tried searching some of the threads to find some info about this, but I haven't really had any luck. I am totally new to having an I/O, as I have always had outboards instead. I recently bought a 17' Riviera bowrider, with what I was told has a 140 hp 3.0L Mercruiser. Is...
  3. J

    Engine dies when shifted into gear

    Hello. I recently bought a used boat that had the motor replaced with a used one with about 100 hours on it. The motor runs great, and idles great. There was one problem with the exhaust manifold, and water managed to leak back into the engine, but a new manifols solved that. I just did an...
  4. J

    Low power at full throttle

    Hello folks, My friend recently bought a 17 boat with a 115hp Johnson. I know this may be difficult as I don't have much info on the motor itself, except that it is likely from the 90's, and it is 2 cycle. The motor starts fine, idles perfectly with very few misses. It will move along at...
  5. J

    '84 75hp Merc Gear shifting

    Hello all.<br /><br />I recently removed my lower unit to have some repairs made to the gears and cam-shift. I have reinstalled the lower unit, and it works fine running with just the muffs as far as being able to change gears normally. However, when I tried it in the water, it shifted form...
  6. J

    1984 75hp Merc, how can I access gears in lower unit?

    Hello all.<br /><br />This past fall, reverse failed to work on my motor. Forward and neutral still worked fine. I decided to remove the lower unit so that I may open it up and inspect the gears, as well as replace the seals, and redo the water pump since the lower unit was off also. I drained...
  7. J

    Gear problems on 1984 75hp Merc

    Hello all.<br /><br />The problem I am having is that the motor will no longer shift into reverse when control is pulled back. I have checked the control box for any problems as well as the linkage of the shift cable at the motor itself, and everything was ok. With the linkage disconnected...
  8. J

    Vibration under heavy load

    Hello,<br /><br />I have a 1984 75hp Merc, serial 6503156. While I was out earlier today, I had a few friends in the boat with me, which is the heaviest load I have ever taken in this boat. We were crusing through fairly rough water on Lake Ontario. There was a lot of weight in the bow, but...
  9. J

    Not firing on all cylinders

    Hello all. I am having a problem with my 1985 75Hp Merc. As most of you know, it is a 4 cylinder with 2 carbs. The problem I am having is that the bottom 2 cylinders aren't firing, or so I believe. I could get it running and idling at higher rpm with warmup lever just fine, but when I bring...
  10. J

    Carb types

    Hello.<br /><br />I have a question regarding carburetor types. As I have mentioned in other previous threads, I currently am running a '84 75 HP Merc, after changing from a 70's 850 85 Hp. The 85 wasn't worth repairing so I am scavenging any parts for the 75 that I can.<br /><br />My question...
  11. J

    Question about fogging oils

    Hello. I am starting to go through winterizing my boat and motor. I have read the FAQs about winterization, and fogging procedures. Is it ok to use 2 cycle oil to fog with or is actual fogging oil the only thing that should be used? The motor will be stored outside, and the winter temps are...
  12. J

    75 now dies when throttled up.

    OK, so I have decided to start a new thread to make things easier for folks. In my last thread I had the problem of not being able to start the engine unless I sprayed gas into the carb throats. Thank to the folks who helped me out on this board, I managed to get it to start normally. I...
  13. J

    Parts compatibility

    Hello all.<br /><br />I currently have a 75 HP Merc from 1984 or so. I also have an 850 85 HP from 1976 or 77. The 85 had a compression problem and after tearing it down and assessing the costs, it was a lot cheaper for me to get the 75 I am using now. I am looking to sell all serviceable...
  14. J

    Problem starting 75HP

    Hello all.<br /><br />I am having problems starting my 75. It seems as though the motor isn't getting any gas when cranking it over whether or not the choke is enabled. The only way I am able to start the motor is by spraying some fuel/oil mix directly into the carbs while cranking over, it...
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