I have received conflicting information about the ability to use an older ski with the flyboard. I know they will not be the best use of it but as a secondary ski and sometimes having to use them would either of the below run the flyboard with a 10 stone person? Any information would be greatly appreciated!! 
1999 - Yamaha GP800
2004 - Yamaha FX140

1999 - Yamaha GP800
2004 - Yamaha FX140
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