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  1. Q

    Prop caught on trap, engine wont turn over

    In fact. Take the plugs out and see if you can turn it over by hand.
  2. Q

    Trouble shooting low WOT RPM - timing on the 5.0OSi

    Ok. I remember this one. I’m almost sure that the osi is an mpi type engine ? What are those spark plugs you have pictured in the other post ? Unless the osi isn’t the Mpi I think it is…pretty sure you should have iridium plugs in there ideally. Or at least platinum. They look like very normal...
  3. Q

    Prop caught on trap, engine wont turn over

    Take the gearbox off and see if it starts.
  4. Q

    porpoising problem

    Hi. First off…I’d ask if you are using just the trim gauge to tell if you are fully trimmed down ? Second off…I’d ask if it’s possible that a full tank of fuel and passengers in the rear. If none of the above…go a little quicker
  5. Q

    2001 Waverunner XL800 Issues

    Sounds like it’s ran lean, oil line came off or perished, or the power valve has dropped into the piston and done damage. Those would be the main reasons for this. Dead easy to rebuild thankfully. Get rid of that oil injection system and pre mix.
  6. Q

    Trouble shooting low WOT RPM - timing on the 5.0OSi

    What is the issue you are trying to diagnose ? Sorry if I’ve missed it in the above. Is it that it won’t go above 4400 rpm ? Did it used to ? And now it doesn’t ? Couldn’t be as simple as being over propped ? Failing that, it may be in one of the many 90% gaurdian modes. Most common cause would...
  7. Q

    Figure this out , I`m confused

    Those bolts have been stretched with a fair amount of tightening force. When a bolt of a certain tensile strength is over tightened and the threads manage to hold on…the bolt has no option but to stretch, break or shear threads. My thinking anyway !
  8. Q

    Please Help I’m lost!

    Obvious one would be to ditch every drop of fuel out that fuel tank. New filter and see how she goes.
  9. Q

    115 Pro XS 4 stroke, is it a CT?

    Hi. The pro Xs 115 usually has a silver gearcase. But all ct 115’s have the 2.38 ratio. I have a normal 115 ct. black gearcase and 2.38 ratio. Maybe you have too, with a pro Xs hood. The other numbers are relative to the gear teeth, as far as I know. You’ll also be able to tell if it’s a ct by...
  10. Q

    power trim on 2018 90hp mercury

    Hi. There is a known issue regarding exactly this. The shuttle valves in the trim unit are at fault. There are uprated valves now available. I got them sent out to me under warranty. There is a service bulletin released from mercury about it.
  11. Q

    115 Pro XS CT 4 stroke losing RPM and speed

    Jeez. Haven’t checked…but I’d think that your numbers would show some serious prop slip. Is the engine set up well ? I’ve got the 115 ct. with a 19” prop at just a little more rpm than you. About 6000…I’ll see 43 mph gps. Different boat of course, 2” more pitch…but still. Sounds like something...
  12. Q

    Low RPM at WOT

    Perfectly normal to see 50 gps from a fast hull like this and an mpi 4.3. As long as she’s well propped. As an example, Every regal 1900 with this engine I know of, will easily do 50 gps. One particular well propped one, with a 19” tempest plus…will touch 53 mph. A stingray should manage too...
  13. Q

    377mag random misfire

    Was that honestly what the issue was ? Can’t even begin to imagine that being the issue.
  14. Q

    2021 mercury 4 stroke 115 not turning over

    Got you.
  15. Q

    Wellcraft 170 American underpropped?

    More like it. I’d think
  16. Q

    2021 mercury 4 stroke 115 not turning over

    Excellent. Thought it might be. Happened to me with this engine too.
  17. Q

    2021 mercury 4 stroke 115 not turning over

    Have another read fella. He said it cranks but doesn’t turn over. That’s why I’m trying to clarify. One and the same !
  18. Q

    What prop??? Help

    I think either your tacho isn’t right or your speedo pitot is restricted or similar. If you actually only doing that speed and actually those rpm…you have a prop far too wee.
  19. Q

    Propeller wont spin.

    Check it locks one way in reverse and forward. If it was the coupler you’d imagine the prop might be able to be turned when it should be locked. If it was the gearbox failing..you’d imagine you wouldn’t be able to get it locked both gears and into neutral the way you can ?? Not sure.
  20. Q

    Yet another prop question thread

    This is a tragedy. What an engine these are. Just incredible things. Who in their right mind put a solas 4 blade on it ? That’s like sticking a set of Honda wheels on a Ferrari. Should be shot. Deserves a right good prop. If it’s a 4 blade that’s insisted on…at least get a good merc one. is...
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