Regarding assembly of crankshaft

Hello i am working on crankshaft with piston but after assembly i want to rotate crankshaft and there are no proper movement of piston so how to solve this problem

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It would be helpful to see the mates in the assembly, but I think you may have created sub assemblies of each piston, connecting rod, rings, wrist pin, and other associated components. If so, you may need to set each sub assembly to be flexible.
Right click a sub assembly in the feature tree, choose Component Properties, turn on the option to Solve as Flexible.

 
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