Rigging glitch with camshaft

Hello,
I was trying to animate engine in blender and i solved lots of issues from here i parented cranck with gear set to drive camshaft by drivers and now I’m having issues rigging’s not working perfectly cam shaft skipping half rotation everytime i made rotations ratio 1:2 but cam skipps half rotation and rotate as same as crack
Sorry for recording from mobile i was not able to access internet in my computer so here it is link for video please let me know solution
https://drive.google.com/file/d/1NLpkoK-Yuczif41MQzry77PeW7iDIHCl/view?usp=drivesdk

Hey, access denied
The way to get the cam to rotate at 1/2 crank speed is to use copy rotation with influence set to .5 if its chain drive, if its gear drive, tick the ‘invert’ box

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I used another way i used drivers to rotate gears but yes i will try your idea,
Sorry, here’s link again and btw you have my whole engine model link i shared with you before
Thank you you are really helping me out.

https://drive.google.com/file/d/1NLpkoK-Yuczif41MQzry77PeW7iDIHCl/view?usp=drivesdk

ooops yes, i will have a look