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  1. Get the ECU remapped and an air filter before you...

    Get the ECU remapped and an air filter before you go through all that aggro (and potentially lose reverse) to gain 1-2mph :)
    There's much more significant gains to be had there.
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    It might also be reasonable to go way back to the...

    It might also be reasonable to go way back to the basics and check that the engine is timed up properly and that there is good tension on the timing chain.
    Set #1 to TDC and check timing marks. Who...
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    Did you check the terminals as well for scorch...

    Did you check the terminals as well for scorch marks/corrosion? If the terminals have been overheating and are corroded, then switching to a different relay won't do much.
    If they look fine then...
  4. You are right, I think I got the 2013 from your...

    You are right, I think I got the 2013 from your post by accident, sorry.
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    Also if your wire is getting hot, check the...

    Also if your wire is getting hot, check the starter relay. Make sure that the nut has not gotten loose there on either of the two terminals. If it has, you need to take everything apart, sand it,...
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    Check that nothing is loose in the engine...

    Check that nothing is loose in the engine compartment and not hitting the engine block.
    Check that there is no mechanical rattling or knocking sound coming from the engine at higher RPM.
    Make sure...
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    Videos are not going to diagnose your fault, need...

    Videos are not going to diagnose your fault, need to get your hands dirty and check the basics:
    Plug colors, fuel delivery, injectors, compression.

    You probably have more than one issue. Sounds...
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    With the timing being as detuned as it is, I am...

    With the timing being as detuned as it is, I am totally sure it will take 87.
    With my tune I am not sure it will take 91 though, we have only 98 (93 in your measurement units) here on the water, and...
  9. The 2013 Ultra has the upgraded pump, I think it...

    The 2013 Ultra has the upgraded pump, I think it is highly unlikely for the impeller to go for a walk in that one, especially in a non-SC application.
    I'd still change the pump bearings every 100...
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    No injection system is going to use the temp...

    No injection system is going to use the temp sensor in the handlebar, that's purely for dash display.
    Your Ultra of course has a temp sensor, the ECU is blended speed density / alpha n system, which...
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    Pull the plugs and check if one or two of them is...

    Pull the plugs and check if one or two of them is significantly more sooty than the others. This indicates lack of combustion (or in rare cases a failed injector) on that cylinder.
    But you need to...
  12. Probably the best Ski to buy for cruising. Least...

    Probably the best Ski to buy for cruising. Least amount of problems and very good hull for the chop.
    I have not ridden the Yamaha, but the Seadoo RXT/GTX were not as comfortable for me, and also...
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    I fitted a K&N air filter (K&N part RU-2940)...

    I fitted a K&N air filter (K&N part RU-2940) instead of the airbox.
    For that I manufactured a small aluminum piece, so that I could keep the PCV directed into the intake and also to move the filter...
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    Does it do it only on low RPM? Or at all revs?...

    Does it do it only on low RPM? Or at all revs?
    At low RPM the waterbox can rattle around a bit. These are pretty noisy machines. Check that the strap is tight.

    Btw, I checked my top speed for...
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    So for a stock ski that's very good. The stock...

    So for a stock ski that's very good.
    The stock ECU mapping limits the effective WOT RPM to 7600-ish, because after that the timing takes a nose dive, so it stops making power.

    Unless your pump...
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    Impeller is easy - Solas KX-CD-16/21 is for your...

    Impeller is easy - Solas KX-CD-16/21 is for your Ski.
    There is some tradeoff vs OEM, the OEM tends to be stronger. But unless you suck rocks into it on a regular basis, you will be fine.

    For...
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    As above, they probably mixed up Seadoo and...

    As above, they probably mixed up Seadoo and Kawasaki...

    The Kawasaki has a much superior eaton roots type supercharger. These are commonly used on cars and easily go 400 000 km without a rebuild....
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    I don't remember to be honest, haven't checked on...

    I don't remember to be honest, haven't checked on mine in a while.
    But peak hold on revs is less useful than you'd think - if you hit some chop and the prop catches some air the revs will shoot up....
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    It will run even without the IAC valve once it's...

    It will run even without the IAC valve once it's up to temp, it can stall sometimes, but generally it runs quite decently.
    The IAC valve is more a slow control device to allow more air past the...
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    Guys, talk sustained RPM, the speed sensor is a...

    Guys, talk sustained RPM, the speed sensor is a joke, especially in the chop.
    Hell, try left and then a right turn and then watch what the speed shows during one and the other turn - the difference...
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    Make sure to cycle into the RPM display on the...

    Make sure to cycle into the RPM display on the dash to see the exact number.
    The speed sensor (paddle wheel) is not very accurate, it's strongly affected by chop etc. If your pump is in good shape...
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    I meant that the one that the parts interchange...

    I meant that the one that the parts interchange with is not the ZX14. IIRC it was ZX10 or ZX12.
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    Ignore the speed. What is your RPM at WOT?...

    Ignore the speed.
    What is your RPM at WOT? Sustained.

    Between 7400 and 7600 on a stock ski is normal depending on elevation and air temp.
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    I didn't say the STX doesn't have, I meant the...

    I didn't say the STX doesn't have, I meant the current 2020 Ultra LX doesn't. Nothing changed there.
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    It does not.

    It does not.
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