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781cc is only 15ccs more per Cylinder than a 750. The Jetting should be almost identical. The Point is that your Main Jet is way too small and you are sticking your Pistons every time you do a WOT run and the Engine shuts down. You should be able to adjust the Low Speed Screw to match your...

Kawasaki 781cc small pin w 650 West Coast Pipe 42MM TAPER BORE SUDCO BLUE RACING CARB A/M Flame Arrester & Pipe *No Inner Venturi & Smooth Finish for more Air Flow Keihin Pilot #105 Low and Main #165 High jet

Who supplied the Container? :D

Did you or YRC supply the Container/Crate?

Make sure the MSD Coil Grounds are clean and tight. I used to have to clean and tighten the MSD Coils' Grounds and Bolts every season. If I didn't, would start having misfiring spark issue at/near WOT. White chalky corrosion would build up and cause the missing spark symptoms. Could also use...

It will seize again, probably at the worst possible moment. It's a vicious downward cycle. The Metal Pixie Dust builds up inside the Ring Grooves. Rings need to float and rotate freely at all times. Any Crocodiles riding with you Guys? Have a Rescue Ski to tow you back to the Dock?

Compression is too low. Most likely needs new Pistons and Over Bore, Hone and Chamfer. It's not only the Rings that wear out, it's also the Cylinder Walls. To double-check , need to measure the Cylinder Bores for excessive wear. See Kawasaki Manual for tolerances. If you send it, even if it...

650 and 701 Exhaust Hose are different diameters. Take some measurements. Can "stove-pipe" one together with one 90 Silicone Elbow. two 45 Elbows, two DIY Aluminum Tubing Couplers cut to length plus six Hose Clamps... Or might can buy a cheap used Yamaha Exhaust Hose or two with the right...

Yes

Modified Kawasaki SXR 1500 Hood in Excellent Condition for a great price. Hood has been modified for increased Air Flow with cut-outs and Frog Skinz. Shipping is EXTRA and 100% on the Buyer. Have no idea what the Shipping and Packaging would cost. Buyer makes all the Shipping arrangements...

https://www.aircraftspruce.com/catalog/appages/lp1200tube.php

Have a Brand New one for $75 shipped. Comes with Grommet Kit.

Beware of Scammers!

Beware of Fake Clone Account!

The Stock Pipe is a "Dry Pipe", which means it is double-walled or has a water-jacket. The Big Rubber Boot makes up the Outer Wall of the Head Pipe. So the big Rubber Boot covering the Head Pipe, between the Exhaust Manifold and the Chamber, carries Cooling Water under pressure. So the...

CALCULATING FLYWHEEL MAGNET STRENGTH This is a Crude Ballpark attempt at calculating the Flywheel Magnet Strength to use as a reference tool to distinguish a Good Flywheel from a Bad Flywheel. Then the Actual Magnet Strength can be measured with a Gauss Meter and compared to the Nominal...

There's a used purpose-built Jetski Tank for $750 in Dallas. Comes with a lifting Boom. https://dallas.craigslist.org/sdf/boa/d/mabank-jetski-test-tank-seadoo/7617177463.html Also seen where a Boat Shop had made a small rectangular concrete pool with a boat trailer ramp. Deep (2ft+) enough to...

Here's another way to check Flywheel Magnets: "You can use a multimeter to measure the resistance between each pair of adjacent poles on the magnet. If there’s a significant difference between measurements, it might suggest that some magnets are weaker than others." So all Flywheel Magnet...

Seen where Pam Coffman wrote that the Rocket Pipe was NOT made for the 750 SXi. If there is no Waterbox, you will have a hard time trying to dial in the Carbs. 2 Strokes need some Exhaust Back Pressure. You didn't say if the Keihin Fuel Pump itself was rebuilt... The Jetting and Pop-Off you...