timing mark jumps around when using timing light

mike Rhat /
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trying to adjust (and/check) timing on my tomos a35 with cdi....borrowed a timing light that is supposed to work fine, hooked up to car battery, lead on to spark plug wire, spark plug pulled and grounded, flywheel turned with a drill....mark i made to find when spark is firing jumps around all over the place....thought i had it once...stoppeddrill to get my sharpie, tried it again and the mark was jumping around again....any ideas, advice, what am i doing wrong?

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