custom skin too much bound bones

I try to make a yasuo custom skin with Maya2014 but when i export Maya2014 said "too much bound bones pls remove 17 influence" so i removed some bones and export but the .skl and .skn i get from exporting make me freeze while in loading screen. can someone tell me how to fix this pls i saw someone in leaguecraft make yasuo custom skin too and when i export his custom skin Maya2014 say too much bound bones again but how did the skin maker export the skin even though the skin have too much bound bones?