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how to use the yz shim chart

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i have a 01 yz 250f and i'am really bad with maths and paranoid about stuffing things up

heres my clearance

left ex: 13mm

right ex:0.14mm

left intake 0.24mm-yes 0.24mm i know

centre intake 0.10mm

right intake 0.07mm

do i have to take out the old shims and measure them before adjusting them, cant i just go by the clearance

heres the chart http://www.thumperfaq.com/valves.htm

go to the bottom of the page and click on MS excel valve adjustment calculator

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