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Do you think this part will be the right size for a 1990 superjet 650? http://www.shopsbt.com/yamaha-jet-ski-coupler-shafts/yamaha-coupler-shaft-650-700-SJ-6R7-51323-01-00.html I ordered a part from blowsion but the thread size was 2 mm to large, so now i am in search of a part.

Okay thanks everyone

The drive shaft splines look good and the impeller is good so i guess its the midshaft needs to be replaced. I guess ill give it a shot and pull the engine. How hard is it to realign the engine and pump on reinstall?

Hey i just traded an old boat for a 1990 Superjet 650. On my 4th ride something got sucked into the impeller and now the coupler spins but the impeller does not spin. Im was thinking there is probably a shear pin in it somewhere so i removed the drive shaft/pump and then i removed the midshaft...