Being a bit of a speed freak, and liking both power and speed I set about upgrading a Singer 306k yesterday with a .9 amp, 7000 rpm motor to replace the original .5 amp Singer unit.
The new motor is much quieter and has an electronic pedal which gives nice control, and the 306 is such an amazing machine, with a rotary hook it could probably sew even faster with nary a ripple on the water.
We carry the motor and pedal kit which fits most Singer models, price is $70.00 cdn and this will include a belt to match your machine, as the supplied belt is too short for some machines.
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