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  1. Q

    Battery discharge. ...normal?

    Not normal for sure. I’d be perhaps tempted to ask what kind of boat it is and what auxiliary devices it has that might draw power. And chart plotter or fish finders left powered up ? And fancy lcd dash equipment or similar ? I’d also suggest that although you have an enormous CCA rating of...
  2. Q

    2020 3.5 HP merc only runs at half choke.

    Did you US clean it. Sometimes needs it. Or at least done again. I’d also say that I had to mess with the settings a little too. You’ll maybe need to break into the anti tamper thing if it still has it covered.
  3. Q

    142 supercharger on a stock 5.7 ?

    Fair play. Not surprised to hear that.
  4. Q

    142 supercharger on a stock 5.7 ?

    Apologies to jump on this. But do you have one in mind or that you’re aware of that can replace a stock 555 ecu?
  5. Q

    142 supercharger on a stock 5.7 ?

    Did they not mate big block 7.4’s to alphas at one point Scott ? I’m sure there used to be an old glastron in my yard with an alpha one or maybe even an mr1 with a 7.4 carb in it. Likely not a great idea though. Agree. I’ll have about the max for an alpha in my boat, but always a good idea to...
  6. Q

    yamaha engine slowed down

    Not much to these engines, in terms of sensors. They are fairly basic in that sense and yours is about the last they made of an engine that’s been about since the early 80’s. If your alarm is working, it should have shown evidence of anything like and overheat or low oil, by and audible alarm...
  7. Q

    2020 3.5 HP merc only runs at half choke.

    Hi. I had one of these. Terrible things for getting issues like that. Especially known to take oil into carb, from sitting in storage. Even sitting the correct side up…terrible for it. The solution is a proper carb clean. After a manual carb clean on the bench…it still didn’t run perfectly. I...
  8. Q

    1997 Mercury 150XL - compression.

    If it helps…you can thank your lucky stars that it’s not a big v6 yam 2 stroke. Recently learned the eye watering cost for parts to rebuild one of them. Even doing the job at home and after a trade discount. Just crazy money. Over £2k for parts here in UK…with the discount. With your particular...
  9. Q

    1997 Mercury 150XL - compression.

    Good call. Can I ask what you think causes the issue ?
  10. Q

    Identify My Mercury

    Going by the decals…it’s somewhere between 96-99 I’d think. Just thought I’d ask…what’s the story with the white marking on the upper mid section ? Is that salt dust or heat damage or something less drastic ?
  11. Q

    1997 Mercury 150XL - compression.

    She’s going to need at least one new unit…usually more required is likely too…unless you’ve been lucky. I’d be inspecting other pistons too..to make sure…but most crucially other than the obvious damage unit..is to know if the crankshaft and bearings are ok. Often after a top end failure…you can...
  12. Q

    2005 Merc 9.9hp 4 stroke excessive vibration

    Is say that it may be normal when cold and warming up…and especially noticeable out the water like rbis. But if it is rough running when warm and on the boat…I’d be suspecting a fuel or basic ignition issue perhaps.
  13. Q

    Quick hub question

    No doubt about it, if he was in the rpm range and we’ll set up with the previous. Think I’d be tempted to get the old ones repaired. Be less out the pocket you’d think too…and being winter with time to spare too. That said. The above may be relevant to a normal guy…but me being obsessed with...
  14. Q

    Mercury 1999 9.9 hp

    Ah. Didn’t know that. Excellent info. Never owned either of them. Had most others from merc and Yamaha 10hp and below. Only one close was a 4.5 merc. Briefly had a white hood merc 10hp (100 or 110) maybe. Never ran. Never used.
  15. Q

    60 hp EFI Loses Power and Runs Rough

    Hi. Tell us what they said they all checked or looked at for the money. Just to maybe try rule things out. Although sounds like they aren’t too great anyway. I’d check the fuel system over in more depth. Assuming filters and fuel is good to start with…I’d be going straight to the VST. Check if...
  16. Q

    Mercury 1999 9.9 hp

    You never mentioned about the idea of maybe it being in gear. Check to see if you have that lock out on your engine. I’d say.
  17. Q

    Mercury 1999 9.9 hp

    Fair play. Suppose I was more referring to the smaller engines though. Haha. I’m sure you were already aware I was perhaps.
  18. Q

    Mercury 1999 9.9 hp

    Just thinking on it. That engine might be new enough to have a interlocking device that won’t let you pull it, when in gear. Possible that happened?
  19. Q

    Mercury 1999 9.9 hp

    Ok. Think you should do a compression test on her then. So you pretty sure that the reason you couldn’t pull it easily, was because it was locked up with water ? Did water come out the plug holes when you pulled it over too ?(with plugs out) Any chance it was in gear when you pulled it and...
  20. Q

    Mercury 1999 9.9 hp

    Hi. If it’s just a little sign of moisture on the plugs…how sure are you that you don’t have water in your fuel ? Or if it has a small in line filter…some in there. The alternative (if indeed it’s not likely to be the head)…isn’t good…would mean that you have serious corrosion to the extent...
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