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Upgraded Decompression Spring - Zhongshen 190cc ZS190 Daytona Engine
It helps reduce the load on the starting chain by preventing the inertia weight from swinging before the engine starts, and it also helps during shutdown by preventing kickbacks.
Since the spring is 1 mm longer, it may cause the inertia weight to jam.
If this occurs, you should carefully straighten the retention plate allowing more room for the weight to rotate freely.
Ensure that you straighten the retention plate mentioned above or remove part of the end of the inertia weight, otherwise it may cause the spring to break when tightening. Also, make sure the spring is correctly positioned during installation to prevent it from breaking. The weight should move freely without excessive play; otherwise, the arm will not interrupt the cam roller.
