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  1. L

    Cracked Anode

    Took the boat out on the weekend and when I got home I noticed the cracked anode. Just wondering if anyone has had this scenario before. I didn't hit anything and the prop is fine. Regards Leachy
  2. L

    Surface Gap vs Electrode spark Plugs

    Hi There, Is there an advantage of one over the other. My motor had surface gap plugs but the Merc deal gave me the conventional electrode type as a replacement. I didnt realize until I got home. Apparently they are equally compatible but mercury fitted the surface gap.
  3. L

    Any benefit fitting a SS prop to 75HP 2 stroke

    Hi All, Just wondering if there is any real advantage fitting a Stainless Steel prop to an old 75HP 2 stroke. I was looking at a couple of random posts and a lot suggested that it wasn't really advantageous below about 115HP as the smaller engines dont really have the power to take advantage of...
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    Mercury 75hp 3 cyl vs 4 cyl, why two designs

    Hi All, I have a 75Hp Merc, 4 cylinder 1986 model. Mercury also manufactured a 3 cylinder at the same time I was just wondering why they would do this seem strange. Is one meant to be better than the other? Thanks Leachy
  5. L

    Wont restart after running at higher RPM

    So this is the second time, Its a 2 stroke 75 hp Merc 1986 model. After running faultless for 40 miles at 26knots 4200-4400RPM and I stop the motor it wont restart. It will kick and idle until it dies, not long enough to get into gear. It seems like its flooded but cant understand why and if it...
  6. L

    Fuel Leaking out of engine cowling

    Sorry hard to describe in the title whats happening, but wanted to find out if this is normal. The other day I ran the engine for a while out of the water (ear muffs on) and was checking the trim/tilt after a rebuild. I stopped the engine and after the the engine had been fully tiled and then...
  7. L

    Faria Tachometer Pole Setting for 75hp 4 cylinder

    Hi All, Just trying to setup a tacho on outboard. Its a Faria Chesapeake 0-6000prm model. I am trying to select the correct pole setting. I thought I had it right but out on the water at WOT it was of the scale, somewhere around 7500rpm. I have read the instructions and it mentions a Tach...
  8. L

    Merc. 86 model 4 cylinder fuel pump

    Hi All, can you damage the fuel pump by not opening the fuel tank breather? I was doing a bit of work on the old motor, replaced the water pump and ran it to check it. brought the revs up quiet a bit to test. What I didnt realize was I had the vent closed on the fuel tank and ran it for a while...
  9. L

    Tilt Cylinder Seals

    So I need to replace the tilt cylinder seals. I was just wondering it anyone knows of the correct distance between the location holes and the size/depth of the holes. I need to buy the tool to do the job and just want to make sure I buy the correct one. Not real easy to get a ruler in there to...
  10. L

    1986, 75Hp, Replacing the impellor

    So I managed to get the bottom leg off the motor after two years of trying. I'm the second owner of this motor/boat and I dont think it was ever replaced, I think the motor only has 20-30 hrs use on it. I I have ordered a complete new top and bottom housing kit along with seals but I was wonder...
  11. L

    How high does the water need to be for the water pump to work

    Hi All, Getting ready to finally get the boat back in the water after 2.5 years. I wanted to test the water pump to make sure its ok. I could only just get the inlet vents submerged not above the cav plate but all vents underwater. When I disconnected the hose the water was not pumping through...
  12. L

    Carby Cleaner, Fuel Additive

    Hi All, Just wondering if anyone has added this to their fuel and is there any point on a 2 stroke motor. Regarsd Leachy
  13. L

    Voltage Regulator for 75HP

    Just looking for for some advice. I have a 75hp 1986 model that is only fitted with a voltage rectifier so at higher RPM the voltage gets over 1above 16V, not good for the battery or electronics. I have managed to get my hands on a Mercury voltage regulator #88825A7 and was wondering if I can...
  14. L

    Timing Marker on 4cyl 75HP 1986

    So I was thinking I should have a close look at the timing on the motor seeing I replaced the trigger plate and stator only to discover a faulty switch box. I pulled it all to pieces not really understanding how the timing and the rotating trigger plate interacted with each other. The issue that...
  15. L

    2 Stroke vs 4 Stroke Torque / Power Curves

    Hi All, I was just wondering if anyone knows of a site or has ever seen torque / power curves comparing 2 stroke and 4 stroke motors. Im interested to see how they differ typically around the 75 - 100hp range. It would be interesting to know if a 60hp 4 stroke produces similar torque to 80hp 2...
  16. L

    Amp output of a 1986 75HP charging circuit

    Hi All, Trying to add a voltage regulator to the charging circuit of the my 1986 Model 75HP 4 cylinder motor. At the moment from factory they only fitted a rectifier and its pumping out over 17V at higher RPM. I believe there is a a Mercury regulator #88825A7 which can be fitted but these are...
  17. L

    High Charging Voltage on 86 Model Merc

    Hi All, After some advice here. Im getting close to launching a 2 year restoration project and checking things over. I was checking the voltage of the battery after starting the motor (86 Mod Merc 2 Stroke 75hp 4 cylinder) and the reading was 15.1 V at 1200RPM to 3000RPM. I have replace the...
  18. L

    Setting Timing on a 75hp 4 cylinder

    Hi All, I think I know the answer to this but not 100% certain. Does the motor have to be in the water to set the timing. I know it needs to be in the water to set the idle. Thanks in advance. Leachy
  19. L

    Stainless Relief Valve for Tilt and Trim #893929A01

    Hi All, Just looking at refurbishing my tilt and trim as it leaks on the main tilt cylinder. I was looking on Amazon and saw stainless replacement part #893929A01. The factory is plastic. I was just wondering if any has used this and is it better to have plastic over stainless in this...
  20. L

    Ideas for getting the bottom of the engine off.

    Hi All, need some advice on how to get the bottom of the motor off. Its an 86 model in almost new condition less than 20Hrs, boat never got used after it got a new motor. However I dont think the impellor has ever been changed. I tried unsuccessfully, it has lived a saltwater life and the...
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