Polaris has been out of the ski business for 7 or 8 years and it wasn't because they were making great skis. Finding parts for their machines can be a challenge and all of them break eventually. Yamaha is still around, and parts are usually easier to find. If you can find out the specific model and year of Yamaha it will be easier to make a recommendation. Keep in mind that you are talking about older 2 stroke skis, which can be more headache than they are worth reguardless of brand.
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2008 Yamaha FX HO Cruiser
2010 Hurricane Sundeck 2100
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