Track Tac

Al Nunley

In short, you put a scale between an immovable object and the kart and briefly push the throttle and take a reading. The kart can't move, so the clutch will dwell at stall speed, so don't do more than blip the throttle. Keep changing springs and shoes until you get the highest reading on the scale, at which point you know that your clutch is engaging at the peak torque RPM. A problem I see with this method is like multiple dyno pulls -- heat soak and associated issues... But it's a poor man's clutch dyno.
 
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