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What was the reason for the shortblock being replaced? If the setup was working great before and that was the only thing that's changed, then I guess your options are to either to start tearing bits...

Since it sounds like a heat related issue, I'd suspect it's a lack of cooling causing a hot spot in one or more cylinders causing detonation until it cools back down.
Could be caused by a coolant...

If there's good flow coming out the side ports, that means the overheating alarm is probably coming from the exhaust temp sensor from water not going through the sprayer there. I'd recommend checking...

Likely compression or timing if you've ruled out the fuel, air and spark. I'd do a compression check and if all is normal then take off the valve cover and check the timing marks all line up. If your...

What model is the ski? Sounds like you've already checked fuel and spark - I'd be looking into the air filter and maybe throttle assembly.

I've got a '14 SHO and the plugs are always black on it;...

I generally wear a 3mm surf wetsuit with an outer waterproof jacket in winter - wetsuit keeps warm if you get soaked, and the jacket stops the wind chill at speed. As a side note, I'd be pretty...

Could be too much grease in the intermediate shaft, or your coupler is badly misaligned (this was the case for me after a botched warranty job, and took me ages to find out). Hopefully that helps!

Sounds like it's narrowed down to either the sensor or oil pump. Personally, I'd reckon it's more likely the oil pump is worn out and doesn't produce enough pressure at idle revs. That would make the...

I've been using a replaceable plastic one for over a year with no issues - I think it depends if you ride in water with a lot of debris as that would chew the liner up real quick.
I didn't go with...

I had the exact same issue, and it's because of spray down the engine cover like the other posters say.
The reason it only happens on cylinder 3 is because the cam position cable sensor is right...

Cheers mate, thanks for the help - gonna just roll with it and not overthink the issue.
Gotta admit it's an easy trap to fall into, as I've always taken care of the ski so well. Mostly just irks me...

Hey TimeBandit, thanks for the response!

What I meant by it being difficult to install was precisely due to the reasons you mentioned - the IB flexed once the pump was pulled to align itself to...

Hi all,

I'm lookin for some help after fixing a very poor coupler alignment from the dealer (over 3mm out after a warranty transom sealing job to fix a leak), as I've come across a new knocking...

What I've found is that cylinder 3 has a cable (cam timing sensor I believe) running next to the coil that essentially traps water near the coil seal - my theory is that when you rinse the engine...

I'm not sure if 304 would be a suitable material for this use - I'm a mechanical engineer myself, and typically something that's exposed to above ambient temps and salt water would require 316...

Woops forgot to mention the basic details - the ski is a 2014 FX SHO (FA1800N).

EDIT: Ski in question is a 2014 FX SHO (FA1800N).
EDIT2: Added a clearer picture.

So after deciding to do the annual service myself this year I've come across what might be a big issue - while...