78 CB750F won't start after carb clean and spark plug tune-up

Posted by Rockwork on
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/78-CB750F-won-t-start-after-carb-clean-and-spark-plug-tune-up-tp4052738.html

I just did a carb clean and serviced the spark plugs and now CB won't start. It started sputtering this week at above 2500 rpm, so I figured it was either a bad spark plug  connection or obstructed gas flow.

I checked the fuel tank cap, cleaned and re-gapped the spark plugs, clipped the coil wires and reset the connectors, and then pulled out the carburetor and cleaned all the jets and valves. There was a lot of sludge, and maybe some obstruction. but after cleaning, it seemed all the orifices were clear, I set the pilot screws back to where they had been (2 1/3 turns). There's fuel coming out of the petcock, but it doesn't seem any is getting into the engine.

When I try to start it, it just cranks, there is almost no fire -- every once in a while a sputter. I'm jumping it off of a car, so there is plenty of charge.

Thank you for any help diagnosing this problem.