Set the multimeter on amps. Some you have to move one of the leads to another port that’s for amps. Put the meter inline with your battery and connector. Remove pinion or move motor away from spur. I usually have the battery voltage around 8v. Pull full throttle and the multimeter will show the current (amps). I set mine from 5-6a. Raise can timing to increase current lower to decrease. It gets pretty sensitive so small changes are needed. Sometimes a degree or two can change the amps by quite a bit. Typically can timing ends up around 45 to 48 degrees on my motors.