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In that video he has 2 markers on the sprocket, so it's already corrected. So the figure you see is the relative engine speed.
With the cam covers on, you wouldn't be able to see the sprocket....
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Regardless, good find on the video to show what happens in a pump under revs, rep for that
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8k rpm!! Doubt Darrens seen that yet!
Doesnt even own a 306.
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The pump pulley looks to have two timing marks on it, so would directly relate to crank speed