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you can try to rebuild it your self there very easy
here are a few thing to try first
Starter Motor Does Not Operate or Does Not Turn Engine Over 1. Engine run switch in OFF position. 2. Ignition switch not in IGNITION position. 3. Discharged battery, loose or corroded connections (solenoid chatters). 4. Starter control circuit, relay, or solenoid faulty. 5. Electric starter shaft pinion gear not engaging or overrunning clutch slipping. 6. Bank Angle Sensor tripped and ignition switch not cycled OFF then back to IGNITION position. 7. Security system activated. 8. Motorcycle in gear and clutch not pulled in. 9. Main fuse not in place. 10. Jiffy stand down and transmission in gear.
Disconnect positive battery lead,remove starter motor cover,trace heavy cable back to starter solenoid and disconnect,remove starter motor mounting bolts,remove motor by drawing it to the right and lift clear of its recess,thread cable clear of frame.Take your time and good luck
Initial checks would be for the main fusible link inside the starter magnetic switch. Thereafter, check for the presence / absence of +12 on all the fuses box, main connector, battery + terminal and ignition switch.
A wiring diagram of the Honda CBX750F would be of help as reference. Should you be interested, a copy maybe found here.
Sounds like you have a problem with the timing chain and the valve timing is out meaning a valve is down when the piston at the top causing an interference. Take the spark plugs out and with the bike in a high gear and on the center stand see if the engine will turn over by hand by pulling the back wheel. Don't force it or you will bend a valve and damage the piston though it probably has happened already. You would need to open the engine up and see what is happening with the timing chain, valve timing etc and go from there.