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The critical load is axial not radial, this is where 6205s are weak. The easiest way out is by installing a 5205 in the front and a 6205 at rear without completely bottoming the rear bearing. The overly tight fit should be addressed as well, this along with careless installation is killing the...

If the aft bearing is bottomed it can preload the front with no good way to back it off. At this point the front bearing is overloaded in thrust. A 6205 bearing has little thrust capacity to begin with. Solas should cut out the extra material and use 6305 bearings. This will save weight and...

What is the T/G of your resin and how much weight is saved over aluminum?

That casting is for the crank wheel only, 6R7 castings on the 650s were slightly thinner. One of our local riders cut his crank like this and it ran for several seasons as a 760.

The splines need grease too. Yamaha never used 6205 for thrust loads behind any engine more powerful than a 760. Turn the shaft to accept 5205 double row bearing like 1100s had.

No power surge? That means you are running a stock exhaust, right?

The piston got a little tight but nothing out of the ordinary. At .0045 you should have opened the top screws for several tanks. Put it back together and run it.

On smooth water you will never get to 7000 with a stock cyl. Raising the rev limit will help most at full speed in chop where a low limit cuts the engine too long.

But those guys are playing with other peoples money. Many guys (kids) with $30K skis didnt actually have to pay for them, so cost doesn't count. Im sure some people are spending a great deal of their income/net worth on what is essentially a noisy wet trampoline. That is the puzzling part.

There is also "cognitive dissonance" at work. "If I cant afford a 30k boat then its probably not that much fun anyway". This drives most decision making and is also why humans can engage in politics and religion.

That is blasphemy around here! LOL Every activity is the same in this regard whenever it draws an audience. As popularity builds, money flow goes parabolic. Eventually we top out, the tricks start looking the same and the crowds lose interest. At this point the equipment is too expensive and...

It is filling because you are pulling the handlebars and vent line under water. The line fills and runs into the trap. I have eliminated most of this by installing a small asprin bottle on the end of the vent with a pin hole at the top and bottom. This slowed down the water intrusion enough for...

Yep, just clean ALL the black off of the old one.

It is not a critical job, you can use a barrel sander on a drill motor.

The 31s should get around 160psi. I installed 29s on a fresh 81mm cylinder and got 180psi.

Its called mass balancing, Seadoo puts them on both ends of the crank. The bearings arent loaded so much on watercraft since the case is mounted in rubber. Light flywheels and exhaust allow the engine to move more but is not an issue except for more carb and bendix wear.

Those are factory WetJet Kraze domes, they should be 31cc. You can use any O-ring on top or even rtv sealant.

The 94-95 X2 used that carb on a standard 91-up manifold. There is no great performance difference over a 38. If you decide to run the 40 you should bore the manifold inlet to match. Jetting requirements will be much richer than what is in the 750 carb. You will need an 85 pilot jet and a...

Carbon is more flexible than metal so some attenuation can occur. There is no reason to use carbon unless it saves enough weight. People are spending $100/pound for saved weight in their carbon hulls so this pipe should be 8 LBs lighter than a simple metal chamber that should cost no more than...

Use an OEM 61X gasket there is no o-ring around the domes. The domes should be marked YEP 70-- the last two numbers are the dome size in CCs. Do not use any smaller than a 28 for pump gas.