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Mate! your ski is ancient and not worth spending much money on. But if you really want to, it will be drive shafts if it made a grinding noise when it slowed up. Or it could be drive coupler. Something in the drive line. Its a pretty easy job pulling apart on those old things if all the bolts arent seized. If its drive shafts, it will probably be the short shaft in the engine bay thats stripped due to the pump housing bearings failing and washing the grease from the spline. Or it could be because an engine mount has failed.
 

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You can pull the whole external pump unit out as one unit. Take off the ride plate and you will see the bolts for the pump unit. By memory (and don't quote me) there should be 4x12mm bolts that hold the pump vein and liner to the top of the hull and 4x10mm head long bolts that will hold the nozzle, vein and liner together. Pull them all out once you get the ride plate off and leave the nozzle connected at the steering cable. Then you may need a flat screw driver to pry the pump vein and liner out. Inspect the shaft spline. Once you do that unbolt the engine mounts and a few exhaust hoses etc, and pull the short shaft bearing housing out by undoing 3 12mm bolts. Check inside with a torch. If its rusty its probable stuffed. Also check both the drive couplers and rubber. Let me know how you go.
 
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