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Dont understand why he would install an O-ring in a stock head unless it has replaceable domes or an other than OEM gasket was to be used. Use a new OEM gasket if possible even with the O-rings.

Use a shop vac.

Just no good way to muffle it.

Not by very much without major hull modifications. It doesnt matter unless you are racing.

Oh, thats easy. The number one thing that makes it better for the way people here ride is the pump, it works better. You can take a 1990 SN, install a bigger engine and have the same thrust as a brand new ski with. Handling wise the 650sx has no lateral grip where the Superjet has a lot so you...

Get an SXR or Superjet engine and a Superjet pump installed in your 650sx. Even better stick a 1200 thriple and a 155mm pump in it. There, problem solved.

You can put a bigger engine in the Yamaha and make more thrust. Its difficult to get the same effect from any Kawasaki. But mainly because more people are Yamaha fan boys.

Stators are the same but the 95+ has a stronger cover. Look at the cdi box, the 92 may have 3729 on it. That is the only box that is undesireable, all SXIs had a 3738 box and is the best one.

You can get OEM Kawasaki coils around the same price from online parts sellers. I use them on everything.

#7s are OK for rich freestyle carb tune.

How could water get in without the compression and combustion gasses getting out? A cold piston will stay like new clean for a long time with TCW-3 oil.

The only information available is the name and number associated with the product. All a jetskier needs to know is that "Its bigger, we make it, and you need it". There is more technical info on a bottle of shampoo. Its best to find a carb that has venturi, like a stock mikuni. Aftermarket...

It will be responsive but not much more powerful.

Its not a bolt on affair. Look for a 650 manifold or a 701 case. Even better just use the single 44 it came with.

The 90 550 had a piston port engine which tended to be less responsive than the 91+. It is more a novelty than anything else because they make very little thrust, OK for little kids. 650X2s, 750s, and Superjets are the only skis suitable for larger riders.

Anyone asking such basic questions probably shouldnt try it. Not because it is all that difficult but because any knowledge gained will be bad for the vendors that delude and deceive us. The whole system falls apart when too many people have access to knowledge and show up with good performing...

I would not go that rout. Dales ignition is not very pump gas friendly and has no rev limit, something your small pin crank really needs. Keep the stock carb and ignition for now, most power gains will come from the pipe. Adding more than one mod at a time will cause more problems than you would...

I have used 78mm but only because I had to.

Carbon will be the biggest cost, top quality stuff is awfully expensive and wont have much advantage when used with industrial resin and where load is mostly in bending. I once found a good deal on some culled IM6 from an aerospace supplier. Your engineering background will be useful once you...

Make sure to check your current rpm, if the pump load is well matched to the engine. It is easy to lose performance by blindly going into pump mods. Adding a TBM and a Hooker 10-16 hurt one of the best running boats in our group. The stock pump with a concord pulled harder.