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  1. Q

    454 information

    Ah. Think I’ve got your thinking now. I see now that you were maybe being very specific about the wording and literal name on the decal. I was thinking much more simply with things. So now that’s out the way…what’s the difference between a 4 barrel 7.4, a 4 barrel 7.4 lx and a 4 barrel 454...
  2. Q

    454 information

    Maybe picking you up wrong. I thought you were perhaps suggesting there wasn’t a carb 454 magnum? There was a magnum in both carb and mpi/efi forms. At the same time as the magnum 454 carb…there was also the usual and more common 7.4 carb with less power. Later as you’ll know, there was the 7.4...
  3. Q

    454 information

    Here is the actual one I was messing with not long ago. Fitted to a formula. Some of her components may have been altered over the years, I might suspect though. But yeah…they definitely exist!
  4. Q

    454 information

    There is a 454 magnum 4 barrel carb AD. 100%. Was working on a boat with one just a few months ago and know of a few others too. Supposed to be something like 350hp. Opposed to the usual 7.4 carb of the same era, producing something like 310 or similar
  5. Q

    454 information

    Totally understand all that Scott, to be fair. What I was asking around, was in particular, the standard, numerous and factory straight into boat, engine. Like I say, totally get gains from a built engine with all sorts of variance. Just not too convinced in particular around some of the...
  6. Q

    454 information

    Good info Scott. Thanks for that info. I was mildly aware that the intake was different between the mpi 310/330hp base model and the magnum. Just because of previously looking into K&N filters for each of them years ago. Didn’t know about the cam before you saying so. What is the difference...
  7. Q

    454 information

    A close friend of mine, not long ago, traded in his tired old 7.4 carb, for a late 90’s 7.4 mpi. Best thing he ever did, he reckons. Should be mentioned however, that these early gen mpi aren’t to be confused with the later mpi models, from 2002 and the decade to follow, where the short block...
  8. Q

    2017 Mercury 150 tilt/trim problem (location of relays)

    No worries Tim. Best of luck…you’ll be well versed by now, should it arise again. All the best, Allan.
  9. Q

    Volvo Penta 2002 ? Blown a Fuse, Now Non Start

    Hi. Yeah. You’re going to need to rewire that for sure. Test the starter and alternator too. Battery might be compromised as well. If it helps you any…if she’s like most of the small VP diesels I’ve been in about, there will be at least one, if not two relays inside that electrical box. The box...
  10. Q

    2017 Mercury 150 tilt/trim problem (location of relays)

    Just on the off chance and going Jack to what I was saying about up at the remotes. If you find that it’s not from relays and points at an issue that’s maybe coming from the throttle trim side of things (if unplugging the engine switch doesn’t stop it and alternatively the other plug...
  11. Q

    MerCruiser 3.0 MPI Electrical Short

    Hi, just to clarify...are we saying that he fuse blows at the first key turned position ? Or when the key is turned further to ignition (before crank position) on, where normally you might get a beep from dash horn ? If it's on the first turn, you might rule out a load of things. If it is on the...
  12. Q

    2017 Mercury 150 tilt/trim problem (location of relays)

    the other two are for start relay and main power relay. The trim relays are easy to identify. Follow the blue and green wires from the trim pump, which come up through a grommet in the lower cowling. or the blue and green thinner wires from the trim switches. If it helps, they can be tricky to...
  13. Q

    2017 Mercury 150 tilt/trim problem (location of relays)

    Hi, Having a similar age and very similar engine, the 115. I can tell you that these can have a couple of issues with the trim system. Firstly is the engine mounted trim switch activating on its own. You can disconnect this to fault find secondly is that some (including mine) have an issue at...
  14. Q

    Short shaft kicker?

    you'll also need to think about the trim affect that 100 lbs of engine, set way off to the side and far out, might have. it will be the equivalent of a small adult hanging way off the back end and to the side. I know that less than half that weight on my bracket, certainly has an effect on my...
  15. Q

    Short shaft kicker?

    Thanks Jim. Yeah…I think it’s so important. Even with a 17/18kg or 40/50 lbs of 2 stroke engine on there…lots of forces at play far out the back and trying to pull and haul at your boat.
  16. Q

    Short shaft kicker?

    Short shaft will absolutely be perfect on that boat. As long as the bracket it perfectly mounted. And able to be raised and lowered. But unfortunately, where you will want it mounted, means that those trim tabs will be in the way. I have a bracket on my 19ft cuddy. Use a short shaft on it. I’ve...
  17. Q

    HELP Throttle and Steering Cable Lengths

    I don’t exactly. But I without doubt tell you… that it will absolutely be longer than you might guess or think. Something that’s always caught folk out over the years.
  18. Q

    Mercury XR2 150 stuggling to get on plane.

    Oh jeez. Sorry to hear/read this. Nothing worse. That plug and it’s condition, doesn’t look or tell a nice story, I’d think. Just before we all assume or conclude the worst…any pics or idea what she looks like, looking down into 3 and 4 ? On just the odd and lucky occasion, an optimistic...
  19. Q

    1984 yamaha 150 2stroke

    99yam. Am I right in thinking that these things I’ve mentioned, are under the flywheel and not apparently obvious to some ? Maybe I’m thinking of smaller Yamaha motors
  20. Q

    1984 yamaha 150 2stroke

    See above post from 99yam. Asking about the often forgotten pulsar coils. Have a look at them, if applicable.
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