Clutch won't release

sounds like a broken or missing keyway in the clutch hub/on the main shft

Sounds like the clutch slave & throw out went
or is leaking & the clutch won't release

broken release clutch bearing. You have to change the clutch unit of your car.

Either a problem with the seat switch, or just make sure the block connecter that gose to the switch is fully pushed into the switch if its even slightly off it will stop the engine.

Remove clutch slave cylinder & push piston right in then refit

Ride safe
Bike-Doc

the machine needs to be serviced by a sewing machine repair shop

Have you just replaced the clutch? Taken out the transaxle, and put it back in? Are you sure transmission was in good condition before this? If so, review your procedure carefully to be sure you got it all back right.
Watch the slave cylinder while someone depresses clutch. You should see the little plunger move slightly out and move the clutch lever back. The lever moves the release bearing inside bell housing into contact with the pressure plate. If slave cylinder doesn't move at all, try bleeding again. The plunger has to move when clutch is engaged.
I'm not sure what you mean by "will shift but won't go into gear". You mean it's actually going into a gear position and car won't move? Or it won't go into any gear, period. As if you had no clutch?

Check around the clutch master cylinder for leaks. Sometimes all it needs is a few seals and it's good to go. make sure the clutch slave cylinder is full off fluid.
If you still have fluid in the system when you apply pressure to clutch, fluid will come out where the line is damaged.
Another possibility could be that the reservoir may be out of fluid (which means you have a leak that needs fixing). Some more uncommon things that can happen is having a broken clutch release bearing or fork or release cable. just my opinion, get it looked at by a garage or friend that is a mechanic or knows cars. because if you take it to the dealer it usually will be a big ripoff in $$$. good-luck and may god bless !

I assume that you're talking about changing the clutch release mechanism from a cable type operation to a hydraulic type of operation. Since you're talking about an open primary, you bike would have to be a Big Twin as well. The answer is probably "NO, you won't have to change your open primary". Although I have never worked on hydraulic clutch release on a Harley, I have worked on the cable type clutch release mechanism. The mechanism is on the other side of the transmission from the clutch. You should be able to find a custom replacement end for the transmission that is designed to use a hydraulic cylinder instead of the mechanical "ball & ramp" type release mechanism that the bikes come with. The changes you'll be making should be on the right side of the bike, not the left.

Good Luck
Steve