Re: 78 cb750K won't fire up. (1 coil fires other doesn't)
Posted by
LukeM on
Sep 07, 2010; 2:45am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/78-cb750K-won-t-fire-up-1-coil-fires-other-doesn-t-tp1425305p1430245.html
In the US, it's a holiday weekend. People are celebrating what may be the last long weekend for a while. I'm sure it'll pick up. :-)
I personally was waiting for someone to answer. I think you've troubleshooted/troubleshot the coil thing pretty well. All I could suggest is replacing the bad coil with a known good one, and seeing what happens. My guess would be the igniter thingie inside the left engine cover, or perhaps the igniter amp under the seat.
As far as I know, the oil light only comes on if the stop lamp fails, or the oil pressure sensor fails (or you've lost all oil pressure). Based on the schematics I've seen, there isn't anything that will tell the engine to go on one pair of cylinders if oil pressure goes away. Running with no oil, especially with these tight tolerance engines, is usually trouble fairly quickly.
If I think of something else, I'll follow up. Perhaps someone else will chime in.
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.