died in the driveway

[chink1957]

My 1977 honda cb750f supersport died in the driveway of my sister's house after starting without incident.  I checked fuses and changed but to no avail.  Battery is relatively new.  I am flummoxed by situation.  Any input or insight would be greatly appreciated.

chink57

[SteveD CB500K0]

Basic checks to start with:

1. Kill switch nudged (or shorting out)?
2. Remove a plug - is it wet?
3. Do you get a spark on the removed plug when held against the cylinder head?

I'm assuming that the engine turns over on the starter?

Steve

[Bryanj]

If it got the ignition switch between the clocks make sure the multi plug is still in and the switch bottom hasny fallen off

[PMK]

Mine died after starting well for ages.

Is there a rattle from the kickstart side?

Mine was the rotor on the end of the crank had come adrift.

It's on the kick start side under the cover at the front held by 2 screws.

Check there

[K2-K6]

Does it do anything  i.e. ignition light and starter motor or is it totally dead.

Try "flicking" the ignition key on and of to see if contacts are not making, you amy see a flicker if this is the prob Better at night as you can see any response in the dark.

[chink1957]

Thanks for the expeditous replies.  I won't be able to get back to her until thursday, she is 26 miles away and I am stuck on Nightshift until then.  But, bye the bye, I had nothing.  I will check all of your suggestions as soon as i can and let you know what happened.  Thanks again.

Chink1957

[Yoshi823]

Sounds like the ignition switch itself...i've had the same in the past.

[Spitfire]

Had a similar thing happen to me on my CB750F, went to Liverpool, the bike was running great stopped at the daughters and it went as dead as a dodo, checked the fuses all OK, in the end it was the connections behind the fuses that were the problem, lots of corrosion.

Cheers

Den

[Dave M]

Same thing happened to me on a K6.

Turned out the contacts in the ignition switch had burnt out.

Despite being told that the switch couldn't be removed rom the lock assembly, I removed it and swapped it from an ignition I managed to get with no keys.

Worked fine after that.

[chink1957]

Just a quick follow-up.  As it turned out, it was the ignition switch.  It was  replaced my my local motorcycle shop and replace the archaic fuses as well.  Again, thank you for the input.
 
chink1957