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  1. Q

    Optimax 225 hard start

    Might also suggest you prove the ignition key switch is ok. Just from my recent experience with my merc there. Check the neutral safety switch too.
  2. Q

    Clicking tilt trim and now blowing fuse ? 50 Mercury 2 stroke

    Got to agree with the above. It can only be down to the motor being bad, the rams stuck, you’ve got the locking arm engaged, if you’ve ruled out the electrical side and that’s all good. Does the engine move when you open the vent release screw a turn or two backed off ?
  3. Q

    Unknown Short Circuit

    Sorry if you said already. Did you have a try at putting a meter at each side of the fuse carrier and checking each one across to earth to make sure neither side has continuity showing to ground ? Also I’d maybe check continuity from the live side of the carrier back to the live positive post on...
  4. Q

    Unknown Short Circuit

    Is that not a weather cap terminator plug ? Anyway. Thought I’d ask. Are you blowing that fuse when inserted or only when the ignition is on or cranking ?
  5. Q

    1979 5 HP Mariner question

    Excellent news ! All sounds well. Go enjoy her and amazing to hear of another of these old beauties up and running again.
  6. Q

    Optimax 225 hard start

    Battery, charging output and or fuel quality, would be the suspects for me.
  7. Q

    1979 5 HP Mariner question

    I don’t know for sure, being honest. But it looks very similar to almost all of the small yams from the 80’s. I’ll have a look at mine tomorrow for you. Can’t say that I’ve ever had any issues with the coils on any of mine over the decades. I’ve tested a few of them years ago (when they actually...
  8. Q

    1979 5 HP Mariner question

    Ok. Fair play. So being a guy that has only really used expensive fluke meters over the years, I was always just used to the industry standard of them showing “OL” meaning open circuit or infinity reading when you went across a system that wasn’t or shouldn’t be anointed on have continuity. But...
  9. Q

    Stalling and Starting problems

    Ok. No worries. Apologies for that. To be honest, the truthful and absolute answer is to get rid of the fuel you have really. Known it far too often to cause issues if it’s just treated or diluted with fresh fuel. Especially with carb engines. The carb often needs to be dealt with just after or...
  10. Q

    Stalling and Starting problems

    2 things. 1 it’s almost odds on to be a fuel thing 2 full throttle shouldn’t be 4000 rpm. It should be usually 4400-4800 on a carb motor like this. Generally anyway. Only getting 4000 rpm at full throttle would indicate a very harsh strain on the engine. Not good for her at all.
  11. Q

    1979 5 HP Mariner question

    Hi. I’ll be honest with you. In the past and frankly, even now…I tend to think too much into things around fault finding with engines like this and further developed, in terms of era. It’s just what I’m guilty of, with being a strictly educated marine engineer, taught by old school guys that are...
  12. Q

    Unknown Short Circuit

    Hi. Forgive me for asking, but has that engine been submerged partially or fully in the past ? May just be the picture, but looks like you may have signs of water being around that at sometime. If so, you may need to go over her in detail for other issues.
  13. Q

    2011 Mercruiser 4.3L TKS high temp @ low rpm

    I might add a couple of comments. Firstly I’d ask about the suitability of your muffs ? Have they a good fit ? I’d also ask if you are sure that it’s actually a temperature alarm ? Although 170 is a little hotter than ideal, I’d suggest that the gauges on the dash can be a little less than...
  14. Q

    What are these tiny bubbles??

    You can treat it. An Invasive thing to do, but possible if it’s not all over. But even if it is. You’ll find that many fresh water boats have this, if a certain vintage and especially if they’ve been left in the fresh water without being lifted out each year for too long.
  15. Q

    Force 70 hp questions.

    Green and white is usually trim up wire. I think anyway
  16. Q

    What are these tiny bubbles??

    Osmosis I’m afraid
  17. Q

    Help! Tohatsu MFS4/5/6 oil leak

    Likely you had oil find its way out the top and through the carb when this happens. Terrible for it happening.
  18. Q

    ECU problems

    Hi. Is this when it’s in gear and underway? Did it previously perform better ? If she used to be ok and this is a recent issue not caused by any intervention with props or elsewhere, the most common reason for such a thing on a kad would be because of a turbo failure or supercharger issue. Is...
  19. Q

    Mercruiser 305 V8 running hot at low RPM fine at Speed

    I think you’re most likely right Mike. You’ll know more than I, for sure. I just knew that my mpi from 2003 is a 160. She runs at about 152 on the smart craft read out. Probably because of the cold water I’m in. Also aware of a few other carb (but vortec engines…not sure if that’s relevant or...
  20. Q

    Mercruiser 305 V8 running hot at low RPM fine at Speed

    Love a school day on here. Fair play.
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