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  1. K

    Engine is in, successful run?

    Is the fuel pump being controlled through a oil pressure safety switch? If not should the carburetor “flood over” and the engine stops then the fuel pump will keep pumping and a fire could result.
  2. K

    Tuning Holley 80551 (4160)

    Is it a marine carburetor?
  3. K

    Partial Power... Part of the Time!

    Things were pretty crazy when the first Cobras came out. I did a a few re powers which finally was able to straighten out with help from OMC. They were really good with warranty problems and never questioned any of my requests. Mercruiser was a different story sometimes. Petronic ignition...
  4. K

    Partial Power... Part of the Time!

    I wish that OMC would have kept it simpler with the same shift dog from the beginning As Mercruiser. The very first 800s I installed were chewing the dogs up because they used the same 90* dog angles as the outboards. While that same arrangement worked on outboards it did not on stern drives...
  5. K

    Partial Power... Part of the Time!

    Of course OEM is very good, I like most of the Sierra products but I do not know where the ignition parts come from. If foreign parts are made to real factory specs using the same materials then yes I feel that would be good. It is too bad that the Prestolite electronic conversion does not work...
  6. K

    Partial Power... Part of the Time!

    The main thing about points and condensers is only from some place like NAPA. All that foreign junk you should stay away from. If the points have tiny white spots on them that is from moisture, you can file them but they will fail.
  7. K

    Upper Gear Housing Swap

    Any low profile gear case from 73 to end of production will interchange. If just the water pump housing is freeze damaged then the case should be still good.
  8. K

    Upper Gear Housing Swap

    You will just have to play around with propellers but it should work. The gear ratio on the 140 case is around 2; 1 and a the 165,170&190 were 1;8 so you will have to go at least 2” more. Does the replacement have the same internal steering gear?
  9. K

    Partial Power... Part of the Time!

    I had a similar problem with the Donzi. After chasing a non existent fuel problem and even with the Mercruiser Rinda scanning tool which would show no problem codes I replaced the plugs. I went to NAPA and asked for the most expensive plugs available. The boat had been in storage with just 30...
  10. K

    Sudden high rpms, loss of speed, smooth engine, not the prop..

    Just have someone push the throttle wot and be sure that the carburetor butterflies goes all the way open and stays, not trying to start closing. If you ever watch the way the control works on the back side you will see what can happen. It just depends on who rigged the boat and set up the...
  11. K

    Sudden high rpms, loss of speed, smooth engine, not the prop..

    My favorite tried and true method is to by pass the tank with a 6 gallon outboard tank. That method usually narrows down the problem.
  12. K

    Sudden high rpms, loss of speed, smooth engine, not the prop..

  13. K

    Sudden high rpms, loss of speed, smooth engine, not the prop..

    Make sure that the throttle is opening the carburetor all the way and not “over stroking” which means the throttle goes all the way at one setting and if it goes further it starts to slightly to actually pull the carburetor off of WOT. Under most situations the description points to a wrong...
  14. K

    Sudden high rpms, loss of speed, smooth engine, not the prop..

  15. K

    Removal of AQ170 engine.

    After the engine is removed and if it turns out that the PDS shaft is rusted into the flex plate then the only way it can be removed is by using a 1” hole saw and cutting a hole in the outer perimeter of the flywheel housing to gain access to the bolts that mount the plate to the flywheel. If...
  16. K

    Tilt/Trim backwards

    If the original hydraulic one still works just keep using it until it quits then start using the “ear muff” one.
  17. K

    Volvo Penta SX-A drive U-Joints

    Sierra marine #18-2174 should be the ones you need. If the “C” clips are inside the yoke.
  18. K

    OMC 120HP suddenly backfiring when accelerating

    Try the 6 gallon outboard motor tank trick. Connect it to where the line from the tank is connected to the fuel filter. Of course be sure that the filters are all new including the one that may be in the carburetor inlet fitting.
  19. K

    Tilt solenoid issue or bad wiring?

    Sierra Marine #18-5812 grounded base is what you need. Probably worth the time to replace them both. OMC # 985063 from Crowley Marine.
  20. K

    No Plane, Low RPM'S

    Check the fuel rail with a magnet. The first Volvos with fuel injection had steel fuel rails that will rust inside and the particles will get into the injectors. Later models have stainless rails. If you cannot get ethanol free gasoline that can cause some problems.
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