Super Hick

Hello I have a 2002 Yamaha Banshee thats stock bore with a aftermarket crank. I just bought the quad rode it for a week, and now it wont start. I have tried bump starting it and it fires up. but it acts like it wont "light". Heres what I think is the problem, The shop told me to run Klotz red 2 stroke oil in it. When I asked what ratio I should mix it at they told me 50:1 and " I should be fine". Well after doing some research and calling some Quad preformance shops everyone says they run 32:1. WOuld it be possible in the week that i ran it at 50:1 that i burned up the piston.? When it is running it seems like it is struggling to turn. Thanks. All the help I could get would be greatly appreciated.