If you can get the belt on, the tooth pattern is a little off. The belt is too wide as well. It causes the clutch to bind and always stay engaged. :(
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1 taco eaters like this review
Belt didn't work
April 16, 2013
taco eater :
Bobby Bou from Canton, MA United States
This belt is not 15"..it is 390 mm. the belt is too wide and too tight for the M56.
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Belt did not fit
November 16, 2012
taco eater :
Anonymous Person
This is not meant to criticize Treatland Moped Parts.
I only want to state my experience with this particular part (trac belt)
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solid belt, but not carefully manufactured
March 7, 2012
taco eater :
Jesse Van Horne from Denver, CO United States
this belt will prob last forever, but I am not impressed with the detail quality, it was cut crooked so I have had to clip little frayed wires off a few times, and it still makes a whirring noise when I ride, takes a while to break in. Was pretty easy to install, and I guess it's the only one avialable for a hard to find parts for engine, better swoop it!
Close, but not quite right 
solid belt, but not carefully manufactured