It's a two phase cap run motor, direction is reversed by swapping the capacitor to the other winding. Standard practice with small mains induction motors but the cap is usually wired to give the correct rotation on installation when reversing is not required.
The only capacitors I can find of that value are the 100 volt crossover caps I am using or mains motor caps. The motor runs but the caps are clearly not up to dealing with the current for long as they heat up.
Mains rated motor run caps are not available much more than 80 uF. I could use 2 60 uF in parallel but they would be huge.
I'm wondering if I could use a mains rated motor start cap, whether the reduced voltage would allow it to be used for more than the rated period, given that it won't be used continuously.
Basically I'm looking for a non polarised capacitor about 50 volts working, 120 uF, which can pass a couple of amps for a minute or two without going bang.