The 1820, by memory, has a 2 step v-belt pulley coming off the motor to a 2 step flat pulley at the countershaft. Then a flat belt from the countershaft to the spindle. Is that correct?
Conversion from flat to link/v-belt from the countershaft to the spindle is a kinda big deal. Nothing wrong with flat belts for that machine. Agree with nogoingback, the Logan belt is made for that machine, and the 'link' is just to tie the two ends together, i.e., it is not a continuous belt which would require you to pull the spindle, nor is it a fenner style link belt (google it). Same term 'link' for two different kinds of belts. If your machine is all v-belt, then the fenner style link belt is a good way to go. Fenner is a higher cost brand of link belt, other places sell the cheaper import link belt, Grizzly I think has them.
Alternately, if your existing pulleys work, why not leave them in place until you have the skills to make your own pulleys to the correct size. Maybe run it in back gears if the speed is too fast. If the bore doesn't fit the new motor, you may be able to drill and file to make it work. That way you can use the machine while making/finding the correct sizes.
I once had a Logan 200 that had one pulley off what looked like an auto, maybe an old Buick. Machine worked ok, by memory, I just didn't have a high and low range, only low? And the motor was just kind of hanging out back resting on the peg leg, I don't recall if the adjustment for motor tension was a big deal. Used it until I found a replacement pulley of approximately the correct size and steps.
Conversion from flat to link/v-belt from the countershaft to the spindle is a kinda big deal. Nothing wrong with flat belts for that machine. Agree with nogoingback, the Logan belt is made for that machine, and the 'link' is just to tie the two ends together, i.e., it is not a continuous belt which would require you to pull the spindle, nor is it a fenner style link belt (google it). Same term 'link' for two different kinds of belts. If your machine is all v-belt, then the fenner style link belt is a good way to go. Fenner is a higher cost brand of link belt, other places sell the cheaper import link belt, Grizzly I think has them.
Alternately, if your existing pulleys work, why not leave them in place until you have the skills to make your own pulleys to the correct size. Maybe run it in back gears if the speed is too fast. If the bore doesn't fit the new motor, you may be able to drill and file to make it work. That way you can use the machine while making/finding the correct sizes.
I once had a Logan 200 that had one pulley off what looked like an auto, maybe an old Buick. Machine worked ok, by memory, I just didn't have a high and low range, only low? And the motor was just kind of hanging out back resting on the peg leg, I don't recall if the adjustment for motor tension was a big deal. Used it until I found a replacement pulley of approximately the correct size and steps.