If Crank Triggered excessive Crank pickup air gap (See “Whats the correct air gap on the crank trigger pick (Sensor)?”
Insure that the starter is of a Hi-Torque type and that the batteries are fully charged. Checking battery voltage while cranking will insure batteries are fully charged. In some cases 16 to 18volts can aid to a faster cranking speed. A word of caution: Not all starters can tolerate higher voltages and most block-mounted starters should not exceed 18Volts. *A newly re-striped blower can have enough friction to lower the cranking speed, try spraying silicon spray to lubricate the rotors. If that doesn’t do it remove the blower belt (For testing purposes) and check for spark, this should free the motor up enough that if you do get spark your cranking speed is too low to start the engine with the blower.
