When using a car to jump start a motorcycle, do NOT have the engine running. It's not uncommon for a car alternator to put out more amps than the motorcycle can handle. The biggest fuse on the bike is typically 20-25A, and the battery itself is usually rated for 15A as well.
Do any of the "dash" lights come on when you turn the key on? You should see the oil light come on, and go off once the oil pressure comes up enough to close the pressure switch.
If it won't start when connected to a fully charged car battery, it's time to check out all the systems: starter circuit (will the starter spin freely when disconnected from the engine?), charging circuit (needs to be checked once you get the bike running), ignition system (any spark from the plugs when you crank the engine?), fuel system (will it sputter when you add a VERY small amount of starting fluid at the air box?). Make sure battery and ground connections are nice and clean and good and snug when tightened down. Any corrosion will just take power from the circuits that need it.
Find a good schematic of your bike, and trace down as much as you can find. On these bikes, there's usually one chassis ground. IIRC, it's a pretty good sized green wire that bolts to the frame near the seat. Your bike may be a bit different, but there's enough SOHC riders on this forum who can help with your particular bike.
I hope this helps. Reply with some updates.
Luke M
Used to have a 1979 CB750L, sold it as a parts bike, now riding a slightly modified 1984 VT700C. Network/Field Engineer. Central OH, USA, Earth, Sol System, Milky Way Galaxy, Universe.
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