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There is no need or reason to replace the petcock. All the vac line does is open and close it. No "assisted pressure", just gravity fed. Did you pull the exhaust and check for scoring? If you have a soft seize to many times (3 max with a aluminum kit) you will loose all compression and possibly damage the main bearings. Out of curiosity, did you do a leak down test on the motor after installing the kit? Did you do a heat cycle after installing the kit? The smallest air leak, usually around the reed cage, will cause the biggest problems.
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