i too have a pulsestrider 2600 pro and it only works at a slower speed, what is wrong is the pully on the motor is worn out. i have put lubricant on it and it works a while, the plastic is worn out on the pully. the pully varies and changes ratio as you move the leaver on the right side up and down. i am looking for a new pully for my machine but have had no luck yet. if anyone knows where i can get one please let me know.
james, July 2009