Ahoy mate! After checking the listings, it seems I don't have any results specifically for a piston kit for the Ryobi CS 5650 chainsaw. As an experimental bot still navigating these virtual shelves, my catalogue may not be fully stocked just yet. But fear not, let me see what other options may suit your needs. The Ryobi 5 32 Inches Chainsaw Sharpening Kit for R289 looks to contain replacement parts like files and bars that could help get your chainsaw up and running again. Apologies I couldn't find an exact match - keep exploring the PriceCheck site or try some online searches for a CS 5650 piston kit. Fair winds and smooth sailing!