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Okay, I was thinking jet ski specific failures. I have mostly found retainer failures often caused by corrosion. I can’t nail down the exact cause of rod bearing failure since they get too chewed up and burned before the engine stops.

I think people have become wise to the limits of FX1 pumps. I like the hull but simply cant use the pump.

How are they failing? Is it the retainer? Are they getting hot due to lack of clearance?

If you want more acceleration bore the nozzle. Check your RPM,, it should be at least 6800 with a stock 61X cylinder. It may be okay with a little less rpm as long as the pipe hits fast enough. Higher ports will need a little less load for more RPM.

The bolts can’t get loose without the gasket crushing first. Check them after the first ride then every few until it stays tight. If the paper gasket keeps giving way use a thin metal one.

Those heads weren't for cheating, they were for the limited class where a stock head casting was required. The only advantage would be if a Rotax style combustion chamber was desired. Otherwise you would just use different heads.

The spacing gets a lot of discussion but means almost nothing compared to the load that blade angle places on the engine. See how quickly it hits the pipe from idle. Do some blade bending if it doesn't get there fast. All stock Solas impellers have too much load for 701-760 engines. ALL OF...

What are they worth to you?

I think they underestimated how bad owners generally are.

The metal gets thin so be careful making them too flat once they are raised.. Another option is pulling the liners and matching the cylinder to lower them. This will give many setup options but few people do this. A good pipe is required before raising the transfers will do anything.

A little wider is more comfortable for me. I like to leave the top half of the gunwale in place and mold in slots that I can put my foot under. Its very comfortable and easy to keep your feet in the tray when jumping. The only problem on a 750 is the storage tubes are in the way. Its kind of...

If I had that ski , I would get a 750, a pipe, and prop. Repair everything else, especially the loose pole, and it would be a very fun ski. It would cost an extra $3000 or more to do it right. I have done this to all my old Kawasakis and they're actually enjoyable to ride now.

I wonder how much flow separation the sharp edge at the pump inlet ramp creates?

After seeing those reeds??

Pull it off.

It looks like a nice hull. It needs to be completely disassembled, inspected, and upgraded. There are very few people, especially jet skiers, who will spend $3000+ and a lot of time to bring an old 650sx up to like new condition with 50MPH power, that’s also reliable. You do have many good...

The 87 crank and case may not have a lock ring on the bearing, I know mine didn't. I would NOT put a fresh top end on that case if all it has is a pin. The crank tends to walk fore and aft and can push the front seal out. The 87 exhaust chamber was bolted to the head pipe and would break. Find...

The running temp plays a large part. Hotter running pistons will burn off more of the oil leaving the oils detergent in a dry form to keep carbon from sticking. Aircooled oil has particles (ash) that prevent carbon from sticking. Most marine applications run cooler so everything stays wet and...

I have run oil mixes from 100:1 to 16:1 in watercraft. Now I use cheap TCW3 at 3% or 32:1. Less oil makes the piston dirtier and makes the exhaust drier. Different oil types will show different characteristics. If you want something a little better than common boat oil, Maxima Super M is a...

Changing the regulator (pop off) affects part throttle mixture (pilot jet) a lot but does little at full throttle. Do not go into tuning a carb with any ideas about what jets it needs. That’s a great way to melt a piston!