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With a few exceptions both Kawasaki and Yamaha used solid core wires that often break near the cap. The outer insulation will stretch over the broken inner wire and cause a misfire. The quick fix is pulling the cap and slightly clip the whole thing until you find fresh internal wire.. I have...

Think about finding a 62T cyl and widen the exhaust to 66%. Then tune the pump to 7000 rpm. Cheap and easy way to the high 40s on cheap gas.

Wiseco got away from making pistons much lighter than stock. Their new ones seem to expand less than older ones and the skirts don't collapse much anymore.

On 550s, the front cover with the H-pole mount does not attach to the rest of the top deck. Plus the log jumps were hard on front ends. Adding some glass up front would help everything stay intact. No different than adding material to the insides of Superjets. Look at some old 440-550 race...

Electric is easy. All you need to know is batteries are expensive and run time is very low.

Get a tach and see what its turning.

Almost everything is custom made now, theres very little need for OEM support. Banning twostrokes or making our boats quiet is about the only way to get rid of us.

Theres not much difference unless you like to fan the throttle...... a lot. What are your porting specs? What impeller are you using?

A lighter flywheel is at the very bottom of the list for a blaster.

Plus the new Superjet is U G L Y !

Ride in cleaner water!

Thats an OLD 650 race motor. Sell all that garbage and get a newer 62T engine. If you want to use it then measure the exhaust port. If its less than 70%, blend the sides and run it till it pops.

Been a while for me as well.

Dont do that! You will just hurt your left ear.

I would bore the nozzle and note how quickly the pipe responds to throttle inputs. Adjust the impeller pitch if needed. The Mod pipe and lower pitch impeller should turn over 7000 rpm so the stock rev limit needs to be raised. A pair of 44s, even stock 760 carbs will make the pipe hit a little...

The driveshaft seals inside the mid shaft with O-rings, the mid housing seals to the hull. All superjets have a wet cavity behind the mid housing. It is usually full of sand that gets scooped into the splines whenever the pump is removed and reinstalled. Its the real reason splines go bad. You...

Try EVA foam mats, you can get them in many thicknesses.

I have some experience with the large hub Solas 12/18. It was the only size available and I had to make it work on a 701, which it did after a LOT of bending.. Ill say, out of the box, this 12/18 too much load for any stock cylinder engine regardless of displacement. A power valve 850 with a...

Normally, you will lose power if too rich and lose response if too lean. The carb tune will tend to be a little rich of peak rpm when the ski pulls hardest whenever a small pilot is used. A lot of freestyle guys like to use big pilot jets and a leaner main. This kind of tune will respond good...

The ripstop nylon works as good as any specialty peel ply you can buy. Bleeder doesn't seem to be critical, I've had good results with old rags and clothing. Apply a little more resin in the corners and make sure the bag doesn't bridge.