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Look at the splines, all that abrasive rust is whats going to kill it. Those must be perfectly clean, greased, and sealed to the impeller. Ive never needed to shim a Kawasaki pump, however 650s have short splines and it can be installed crooked enough to cause wear. The front cover has a line...

Doesn't Yamaha use SBT garbage for their warranty engines?

An aluminum housing could gall if the fit was a little tight. Even with a press I would warm the housing a little and use grease, any heat will loosen the fit. Im not sure how much heat the rubber mid will take so some kind of light press is ideal. Bearings and shafts can be tapped in if you...

Stock wear rings will have an aluminum housing.

Install one clip and press the bearing against it, then install the other clip.

There is a bit of a learning curve so it sucks for a one time deal. After you know how to do it, you'll never let anyone else touch anything you care about!

You want to verify timing and compression, this will give much insight on your octane requirement. A 701 can get by with its stock 21 degrees of max timing and around 170 PSI cranking pressure on super unleaded. You can still burn a piston on long full throttle runs if the carb is tuned a...

A potential problem is dissimilar metal corrosion. Stainless steel and aluminum don't go together. Many aircraft have been scrapped for this reason. For watercaft, its a simple matter of money more than anything else. Stainless hardware is more expensive so it will never be used unless deemed...

There is one type oil that can cause corrosion, its glycol and used mainly for methanol. Klotz KL100 and KL200, do not use this stuff in a watercraft!! I use it in methanol/nitro fuel but the engine must be flushed with petroleum at the end of the day. Castor oil is better for corrosion but...

Oils that leave the most protective coating have a lot of petroleum and butene in them. Most spec oil is formulated this way because it smokes the least and is cheap. Expensive racing oil is usually mostly ester which has higher temperature rating. Im not sure that a little premix would do much...

Try a gold spring. Generally speaking, single 44s require pilot jets in the 120-130 range with popoff around 30 psi. Main jets usually 150-170, change mains until the top adjuster is around 1 turn out when max full throttle rpm is achieved.

I bore mine straight.

The lowest hole ends up becoming a drain when you turn the engine off. I like to get the water out because our metal parts do last longer without it there. Injecting water closer to the engine is just a somewhat easy way to mask poor pump tuning. B pipes do not have the highest RPM length to...

If the port wasn't on the very bottom how could the header ever drain?

I mark the edge of the impeller every inch, set it on a table and measure the distance and rise. Then apply trigonometry.

Trying to squeeze it all through a stock exhaust port is counter productive.

All I want is just a little M-O-R-E !!!!

Your 44 will work okay, just find a way to attach it and bore the hole to match. It will wake up the pipe a little.

I bet you would really like a 650SX!!

Pictures wont show important details. Remember that a 650 wont have as much low end so raising the exhaust port also requires raising compression. A zeeltronics ignition can help with response and lower the fuel requirement. I like to clean up transfers and widen the exhaust port to 66% of the...