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125 power valve question?

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So I am trying to get a 99 cr125 running for a buddy. He has ran out of money, so here is my question.

Building the top end. New cylinder and piston. The old cylinder was sleeved so the power valves have been cut. He doesnt want to shell out any more $$ for parts.

What will happen if I put the old (cut) power valves in the new cylinder. Will It have bad performance issues? Thanks

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