Is a Predator Ghost faster with valve shims?

Is a Predator Ghost faster with valve shims?
Installed a set of valve shims in the Predator Ghost-powered Azusa minibike to see if it would gain any RPM.

Azusa minibike playlist -    • 212 Ghost VS $500 212 Predator  

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Parts used -
Harbor freight Ghost racing engine - https://www.harborfreight.com/212cc-g...

Billet flywheel - https://www.gopowersports.com/sk200-s...

Valve shims - https://www.ebay.com/itm/324725679977

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