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  1. Q

    Help with 75hp mariner

    Hi. An alarm buzzer should sound when it’s low. But that relies on the buzzer working. If your engine has actually shut down and you’ve got no oil left…and on a few occasions…that’s never good news. You’ll need to do a compression test to see what’s what.
  2. Q

    Trim up not working

    You sure it’s the right relay you checked ? There are 3 relays in a row there, if she’s the 2.1l latest model of 75. Should test across the two pins at around 85ohms plus or minus 10 ohms max. Anyway. All that said…if she is the newer 2.1l model. I have the same but the 115 version. Depending...
  3. Q

    Help finding gear ratio for a distant friend

    Amazing ! Can’t thank you enough
  4. Q

    Help finding gear ratio for a distant friend

    Hi. Wondering if someone might know the details of the ratio, from a serial number ? I think the picture he has sent looks like the serial is OF460094 or OF360094. Much appreciated Allan.
  5. Q

    1994 Mariner 60

    Hi there. Without being cheeky….I think you should have a wee look at the carb diagram for your engine…she’s certainly not as she should be there. All the best.
  6. Q

    Motor needs help.

    Both heads ?? Be a fine thing…Oh man…wish it might be better news…but perhaps even just looking at that flywheel, might not be a good sign.
  7. Q

    White smoke?

    If it’s white, it’s either steam from the weather/climate…or you’ve got a compromised interface seal issue, allowing water to enter the combustion area. Told by looking at the spark plugs perhaps.
  8. Q

    Ambitious fraudster or rare machine

    Looks like a 7.5 alpha one surely 😂
  9. Q

    Need some help fellas !!

    Hi. Don’t waste too much time looking for the oil to check, haha. She will be a 2 stroke (as you’ll know) and pre mix, given her age. If she hasn’t run for a while, I’d simply get some 2 stroke down each cylinder (through the plug hole), then turn her over by hand a few times over an hour or...
  10. Q

    Serviced 25Hp Merc. won't start.

    Check for spark quickly and make sure you prime it with fuel. I’d even open the carb drain screw and prime it to flush fuel through the carb. Choke on and open the throttle. If they’re still no sign of life or even a sputter, back to spark. 9/10 times these things don’t fire is usually fuel or...
  11. Q

    2 stroke vs 4 stroke prop differences

    Good question. If it’s the presumed standard f90…it has a lower gear ratio than the old 2 stroke. Will be 2.15-1. Might explain things
  12. Q

    2 stroke vs 4 stroke prop differences

    So. Thinking about it. And what I said earlier. I’m almost sure if the new engine is from the last few years…it’s not going to be the same ratio as your old one. Your new engine will be something like a 2.15-1 ratio at least. Explains the situation for you.
  13. Q

    Just acquired a boat, needs new prop

    Get a run with her and that 17”. Record the rpms and gps speed you get. Take it from there.
  14. Q

    Just acquired a boat, needs new prop

    Hi. I’d say with some confidence, that she’s likely not a 50mph boat with a 17” prop and a bad one at that. For light boats and fair to bit larger outboards, you generally can’t go wrong with a good old laser 2 for starters. But to be fair, the merc ally black max isn’t bad for a man that isn’t...
  15. Q

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

    Excellent info. Well said. Can I add that it’s likely a good idea to test the relays are on spec. Generally across the serving terminals (usually something like 85 and 86 stamped), the acceptable ohms reading might be given as about 85ohms +/- 10ohms at the most or probably less.
  16. Q

    First Start of the year and High Oil Pressure

    I could be wrong in this case of course, but I can tell you that I’d be not much wrong in suggesting that by far, the most numerous reason an alarm goes off on an engine like yours, especially after just starting cold and after a service, intervention or storage, is almost always caused by low...
  17. Q

    First Start of the year and High Oil Pressure

    It’s different. Two different and separate things.
  18. Q

    2 stroke vs 4 stroke prop differences

    All about the gear ratios. Are you dead sure they are both the same ratio ? Be unusual perhaps. Apart from that. Are you using the old tacho from the 2 stroke ? Was that perhaps a 3 cylinder and the new engine a 4 ?
  19. Q

    First Start of the year and High Oil Pressure

    Be quite unusual for a gauge and a pressure switch to be both faulty, but perhaps more relevant, might be that it would be almost unheard of and also unusual to have an alarm for high oil pressure perhaps. You sure the alarm isn’t for gear oil level or otherwise? The gauge being pinned high may...
  20. Q

    1993 4.3 engine oil type

    Ok. I’ll bite, haha. The manual will state quicksilver 25w40. Should you want to go with that, I’d recommend you to get the synthetic blend version of the brand. The reality is though, that many other people use this very engine in identical form, all but the badge, small tweak or sticker on...
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