A couple of thoughts from a guy who has done cold and heated storage on many boats over the years...but by no means am I the definitive answer man on 4tech engines. I'm guessing you are freshwater being from Toronto...the salt water crowd will have far more input on that to official flush.
1. I've never done anything to "winterize" a boat that is stored in heated storage unless you have reason to believe that in fact could go below 32F in extreme conditions. I've had some owners say they are "mostly" heated unless we have the coolest winter on record.
2. Do your oil changes to get the old/dirty oil out in the fall so it doesn't sit over the winter.
3. There is no reason to change the oil again in the spring if you did it in the fall...unless you like spending money for no logical reason!
4. In my opinion there is no such thing as a "tune up" on modern engines with electronic ignition and fuel injection. A tune up used to mean many things including points, timing, distributor caps...
5. In reference to #4 the only thing of use (to me) for this antiquated term is new plugs ever year (fall or spring)
6. There is most likely a service interval every year years (or hours) for the cooling system but I don't know it.
7. If you have a Supercharged 4tec you'll need that rebuilt every 100/200hrs or every two years or tomorrow if you don't know it's history.
As it gets up there in years there are other things to consider such as cleaning throttle bodies, intercoolers, etc. but I think 99% of the people would just say drive it until you got an issue with such things...and I'm from that camp.
plugs, supercharger health, check cooling system levels and change your oil...rinse and repeat each season or mid-season in warmer climates.
Awesome. Yes all fresh water. I will be checking out the place this week to make sure its sound but they said "COMPLETELY" heated, no need to winterize your boats etc in the ad.
In regards to:
3) I was just planning on changing the oil in the spring as with cars, they usually say 5000 kms OR every 3 months, just not good to use old oil, just really want to keep this in the best shape as I can! But if it's not necessary i might skip it. Just had alot of issues with my old seadoo and I don't want to end up crying again
4) They just recommended I do a "tune up" after you winterize it and than summerize it, but I assume it just meant summerizing/spark plugs. But I don't know their process, that was just what the dealer told me before I found heated indoor storage.
6) Definitely will find out. The boat currently has 87 hours on it, in the manual it says inspect system at 25 and 100 hours, replace coolant at 200 hours.
7) I do have a supercharged 4tec, the manual says to replace Supercharger clutch (260 engine) at 200 hours. Is this something I should do before next season? Should I look into it at 100 hours or at 200 as the manual states? Getting very close to the 100 hour mark. I don't know the entire history as I bought it at 80 hours, but it looked very well taken care of from the previous owner.
I most likely will have a complete inspection done before I take it out next season aswell as the manual states to inspect almost everything at the 100 hour mark.
Thanks for adding about the gas, that was a question I had but totally forgot about. I used fuel stabilizer in my sea doo, but didnt want to this time. But I will definitely fill it up, thanks for that!