Topic: 1978 CB 750K running very rough..

[crousos]

my 1978 CB 750K running very rough.. lately with a lot of backfiring .. it started about a month ago  first it looked like on of the spark plugs was burned up .. but I replace all the plugs and it seemed to be running ak for a short time but now its back to the same.. it backfires all the time and is running like crap...  it seems to be better at 4.. 5 thousand RPM but not great...

Also checked the points ant it look ok...
the same for the carbs...

I had this bike for over 10 years and this is the worst it had been ...

any ideas greatly appreciated

Constantinos

[goodtryer]

Check the spark plug caps. I had one recently that was way over 5k ohms. Bike idled much better once I replaced the cap.

Also check that you don't have excessive sparking at the points. Could be a bad condenser. Had that cause poor idling on another bike.

Cheers