Another question to the OP, who built the motor, ie did xscream port the cases or was it your uncle joy, that will make a difference in how it runs. Some engines make power more then other, it all in the setup.
Preferably setback 148 or 155 mag.
148 - 7/15 cutback 5 skat
155 - 6/12 skat
144 - 11/17 hooker cut back 5.
Or 13/18 skat cut back 5
That motor will work good with any of those impellers, as long as the motor is tuned correctly etc. Then your need to do some fine tuning on the pump, ie bore...
Turned out nice.
I know it's too late now, but you didnt need to run those rivets, the glue holds the two halves together. Non of my aftermarket skis have bolts going threw the rails like the stock SJ. The stock bolts were just there to hold the bumpers on.
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