Tips for proper belt adjustment. Belt should be at its highest point in the driven pulley flanges. Remove the outer half of the driver clutch. Squeeze the belt down and pull forward. Position the engine so that 1/8" to 3/16" of clearance is provided around the clutch bushing/hub. WARNING! Do NOT run with a tight belt.
Tips for adjusting the spring tension of the driven unit. By increasing the spring tension of the torque sensing system (the driven clutch), the power ratio of the system (driver and driven) can be held longer at high engine rpms before it is overcome by the clutch driver.
To shorten the time required for the driven member to attain it's speed ratio, decrease the amount of spring tension of the torque sensing cams. This will allow the rpm of the drive clutch to overcome the power ratio of the driven unit at a faster rate in a lower rpm range.
Is for 2 or 4 cycle engines up thru 8 hp. The model 20 uses a 3/4" top width symmetric belt. Drive clutches are available for both 3/4" and 1" bore (with 3/16-1/4 keyway). Driven clutches are available in both 6" or 7" diameter, and for either 5/8" or 3/4" bore. Comet 20 series is for application of low speed, added power requirements such as tractor mowers, off the road boonie bikes, four wheelers, go karts, mini bikes, etc. With the 6" driven clutch the low speed drive ratio is 2.68 and the high speed drive ratio is 1.15. With the 7" driven clutch the low speed drive ratio is 3.13 and the high speed drive ratio is 1.40.
