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Yes, do it yourself. You will need a oil extraction pump tool of some sort though.
There is a tread in the How Too's section describing exactly how to change your own oil.

Not the starter. Is the new battery fully charged? just cause its new does not mean full charge.
When did it last run?
Pump clear?

The cranking does not sound right. Remove spark plugs and...

I think your asking is an external intercooler necessary on a 2004 RXP with 42lb injectors and a X charger?

No its not necessary but it is worth it. Performance gains over the stock internal...

Either way, your going to want to tear it down completly because if it had milkshake sitting in it, things are not going to last long. Then you can see what pistons are in it. Are you sure your...

If you delete the 2 included RIVA stickers, does the price drop to $499?

I'm sorry, but that price seems way out of line. It's like Riva has stopped making good products for watercraft riders and...

First head, wit the springs installed, the damage is just in the water jacket are and not in a sealing area if your refering to the marks above the center cylinder. The rocker wear, can't see it....

Nope, if it has a 2004, bad vavles too. If you want to keep it and have peace of mind. Replace them with Supertech's

Avoid the 04, unless you want to replace the valves as they have a tendancy to break. Not sure but I think that issue was resolved by the 06.

Which is faster? Nothing can catch this!!! No SeaDoo, No Yamaha!
Look how the tech has changed.

I doubt you will get an answer from a thread from 2012, but they do say it was the button itself.

Well, its again, not a stock ski and its been modified quite a bit.
Aftermarket head too, a compression check is in order.
Is the hull and drive system water tight? I see they added a bildge pump,...

And what year 800SXR is it? the made them for many years.The 800 stock is a fast machine. For a first time standup its a lot of performance. That modified machine, well, i would think for beginner,...

I hope your not moving stock 04 valves to your 06. They are aftermarket ones correct?

And how do you plan to bypass the oil cooler when it is part of the oil circulation path? You can't just block the holes off.

Watch this video, it will explain it
...

RPM's are quite different is a concern, How much different?
Lots of motor upgrades, intercoolers, superchargers. etc

Post your rpms your getting.

Odd way your cart works, mine, if i accellerate to hard with the boat on it can smoke the tires off idle no problem. Mind you its not a new machine at all (a 1970's Jacobsen golf cart dump truck)...

I use my cart to ferry my ski's and even my boat around (boat is a 18 foot with 100 hp merc) and it moves them just fine, but it's a gas electric cart.
I would not use the cart for the boat at the...

Probably a post and ghost! Sadly.

Look at the rust on the cam lobes. Its toast sadly.

Well, to answer the question, the bolt holes that mount the brackets to the engine are round and non adjustable.
The bolt holes that mount the engine to the rubber mounts have oblong holes and are...

It's sometimes done on machines built just for drag racing and nothing else. Reason is the rest of the time the ski is a dog as it would have little power.
Remember these are tuned to run at max...

Do a compression check, may have a blown piston causing massive crankcase pressure and blowing the oil out the tops valve.

Your going to need a prop or else your going to be all over the rev limiter.

Maybe the intake manifold cracked if it backfired. May have split it along the seam.

Just to clear some things up about how the bellows and carbon seal work.
#1, a soft Bellows will not cause the ski to sink, Heat fron running the engine onland will not hurt the bellows (unless it's...