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Hi, Fbigtank81 and the usual suspects are:
1. Fouled spark plugs.
2. Discharged battery, needs to be 12.5 volts or more and be able to pass a proper "LOAD" test, your battery may show 12.5 volts or more but has little or zero amps causing the battery to be faulty and must be replaced, AGM batteries fail in this category more so than lead acid batteries.
3. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
4. Loose connection at ignition coil or plug between ignition sensor and module.
5. Spark plug cables in bad condition, shorting/leaking, spark plug cable connections loose check for spark leakage in the dark.
6. Faulty ignition coil or electronic control module.
7. Faulty CKP, CMP, or BAS sensor.
8. Faulty ignition switch.
9. Tilt sensor needs a reset.
10. Security alarm failing to disarm needs reset
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day. 79 xs650 Special No Spark But 12v help How to diagnose no spark situation on motorcycle Yamaha XS650SE Shop Manual OEM parts for Yamaha http://mybikemanuals.com/yamaha/yamaha-xs-owners-manuals
the battery terminal being loose would cause that, since the rectifier would freak out. the leak you speak of is probably not eh head gasket ro you would have compression problem with amount of oil that can run down the bike. It sounds like a corner on the valve cover gasket or something I think there is a cover for the valve adjust ment there so check it out the gasket may be worn. no biggie get a new one. help this helps