Seems to work. The wrist pin seems looser than the stock pin and piston. I do not know if that will be a problem. I will find out in the future if the chainsaw doesn't work. I like the wrist pin retaining clips. They are easy to install with needle-nose pliers.
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CS590 Pop up Piston
May 13, 2025
Reviewer:
Anonymous Person from Taylorsville, NC United States
Faster than expected shipping. Well made product. Runs great in the saw. Base gasket delete + pop up + port job = hot lil saw. We’ll see how long she lasts, but for now I’m very satisfied.