Well first off, never use starting fluid on a two stroke. Not only does it not have any lubricating qualities, it acts as a solvent to wash what oil was on the cylinder walls and bearing surfaces off. If you need “starting fluid,” the best thing to use would be some premixed gas.
Second, what have you done to troubleshoot? Did the ski ever run before, or is this a new ski to you? We need to know where you’re starting from and what you’ve done to be able to give any useful suggestions...