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This is new old dealer stock WSM Performance Parts Polaris 250 ATV piston kit, part number 50-300, with matching 51-300 ring set.
Standard bore STD size.
Includes piston, wrist pin, circlips, and original WSM packaging, which shows shelf wear from age.
Fitment. Fits Polaris 250 two-stroke ATVs that use this engine design, including Polaris Trail Boss 250 (1985–1995), and Polaris Trail Blazer 250 (1990–1995).
Also fits certain Big Boss 250 models where equipped.
Note: Please compare your original piston, measurements, and part numbers carefully before purchasing, as Polaris used multiple 250 engine configurations.
