Which motor do you have? If it's the standard 300 rpm motor that fits into the cutout section of the Scoutmaster plinth, make sure it is about 1/4 inch (check manual to be sure) from the plinth. If it already is that far, try moving it out just a tad more. If that still doesn't help, have VPI send you a new belt. How old is your current belt? Also, make sure the belt loops around the center of the pulley. If I remember correctly, the pulley has a couple of varying diameters to allow speed adjustment.
I found that, during the summer months, my SDS was set to 59.85 to achieve solid 33.3 rpm. During the winter, I had to dial it almost to 61 because my rig is in a room that gets cold (lots of windows).
If none of this works, I would suspect the motor itself.
Hope this helps.
Tom
I found that, during the summer months, my SDS was set to 59.85 to achieve solid 33.3 rpm. During the winter, I had to dial it almost to 61 because my rig is in a room that gets cold (lots of windows).
If none of this works, I would suspect the motor itself.
Hope this helps.
Tom