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A bearing would have to be locked up solid to NOT spin the impeller. Probably stripped splines in the mid shaft.

I have to agree with WFO on this one. I listened to the videos and that sounds like lower rod bearing slop to me........which is normally what goes first on a well used Yamaha 650/701. A light honing won't make much difference at all to the bore size. Best to measure it BUT....I have a hick...

I also have always run the BR9es in Kawi's with no issues. The "all or nothing" swap ski I recently finished has already been ridden many hours on the same pair of BR9es plugs. Breaks in the plug wires cause the spark to have to jump a gap. The end result is LOTS of resistance at the discharge...

BWAaahaahaaa........my wife bought me a shirt.... https://www.amazon.com/three-promise-Engine-Garage-T-Shirt/dp/B0C3D3B655

Fingers crossed......

Try 1 or 2 washers under each rear plate bolt to hull location.

The 750 nozzle will only work in a 440/550 hull if you cut the arm down. That's what I did and it works great.

The one I just did.......https://www.x-h2o.com/threads/550sx-to-750-all-or-nothing-build.208950/..........was about the same. I ended up with a thin shim at each rear pump mount. That, in turn, put the driveshaft almost center of the bearing holder opening.

Since those appear to be pieces of a piston skirt.......I'd guess the bore is so loose that the piston skirt was slapping back and forth until it cracked. Then the bits start breaking down and spitting up through the ports. Lower rod bearing and adjacent crank bearings are probably toast now as...

WOW! Looks like everybody got a turn riding it last weekend didn't they.

My bro-in-law has a rough one that needs glass work......BONUS, it comes with a rare set of pontoons! Near Mountain Home AR. $400 cash.

For anybody that's curious on how much time actually goes into a build like this.............here are the numbers!! Can it be done quicker?.....YOU BET!......but the end result will be a direct reflection of that saved time. 550sx ski complete disassembly, strip decals, and thorough cleaning of...

And the big reveal!!...........For anybody that thought I just ruined a nice 'pink lightning' hull by stripping those decals off when I first started this build.........I hope your happy now......LOL..:D:D:D

I worked 'til a bit after 10pm with my wife's help last night. @Donatello was coming to the lake for the holiday so I HAD to wrap this up! Here are some SUPER NICE Jettrim mats going on.

Heck ya!!!

Hilarious!!.........I've been putting jettrim on the 550/750 conversion ski this afternoon as well!

I got some more tuning, ride time, and heat/cool cycles this evening. I Made a restrictor and slipped in the tubing to the stinger water. it's now only a 1/8" hole. I also turned the high screw in a bit, we are now at 1 5/8" turn out. The whole setup seems very happy now with crisp throttle...

I bought this 4 stroke '02 GTX off one of my customers . Her son-in-law had jump started it and blew up all the electronics. It was on a single trailer that I sold. Then recently I bought another one EXACTLY like this off another customer with a bad engine WITH a trailer. It had all the...

It will fit. The stock brace is just a thin piece of stainless that goes from 2 head bolts to the top 4 carb bolts.

No doubt........I tried to buy some Holley carb gaskets recntly.....no-go!