Motorcycle Repair: 81 honda 650, regulator rectifier, jumper cables

Question
hey my name is mo i have a 81 honda 650-i just put a new battery in it and it wont crank unless i hook up jumper cables to it she runs great but when i shut it off she wont crank bak its like she wont hold a chaarge any ideas

Answer
Mo, check your battery to see that it is fully charged and ready to turn the motor over.
You may well have a problem with the charging system which isn't keeping the battery fully charged.
Go to www.electrosport.com and download the free diagnostic diagram and check the "known issues" section. These bikes can have problems with the regulator-rectifier, stator wiring connector, the stator itself, the brushes wearing down and often a failing rotor.

http://www.electrosport.com/technical-resources/diagnosis-center/fault-finding-g...

If the regulator-rectifier is damaged, it may be drawing down your battery overnight from a short in the internal components.

Always start with a fully charged battery when doing troubleshooting on the electrical system. Even new batteries don't handle being completely discharged due to a slow short in the system or a failed charging system.

Check the starter button for good connections, the clutch safety switch on the lever mount, and the starter solenoid for loose connections or perhaps corroded internal contacts.


Bill Silver