Re: 1979 CB750K with prolems
Posted by
LukeM on
Jan 27, 2012; 2:20pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/1979-CB750K-with-problems-tp3691671p3693406.html
Pre Step #1: Get the Factory Service Manual from the home page of this forum. Look in the Manuals section. Read up on the maintenance section (tune ups and stuff), and then take it step by step, checking out all the systems.
It's possible the carb for #3 is not good. Check to see if there's any gas in the bowl by turning out the screw for that float bowl. Look for color and signs of rust or dirt. If yes, then it's time to pull the carb bank and clean them all. Better to do all 4 while you have them off the bike. If the gas looks good, then verify you have spark for that cylinder. You have spark on #2, so that coil is probably good: possibly a connection problem between that coil wire for #3 and its spark plug cap/boot?
I agree with the TOOLS man: compression and leak down should add more data to the diagnosis.
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.