My 100 has the same mile drive setup without the spring on it and it never throws the belt. Just be sure to use the 3/8" CC belt. A lot of people use an "A" width belt which is too wide to fit down into the pulleys deep enough.
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Adam
1964 Model 100 w/ K301 12hp and custom hydraulics
1972 Model 149 turned 129 w/ K301 12hp, triple hydraulics, 66 series clone
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