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More than likely the carbs are plugged up(makes the no idle, popping from the intake or pipe and sometimes hard starting), and/or a vacuum line(s) Is loose/broken, and the carbs are probably out of sync (makes the high sticking idle/little to no idle). I have many article written about cleaning the carbs and fuel system. Get the carbs and fuel system cleaned out if you are not familiar with the process.
Don't know what your last mechanic did but if you have any confidence in him take it back and have the carbs cleaned and adjusted.There may be obstructions.Other than that I would take the carbs off and ship them to a good shop.
Hi, Anonymous you need to make sure you have no intake leaks by spraying some Brake Kleen, Contact Cleaner, Starting Fluid etc. around the intake manifold and seals, if the RPM's go up or down significantly then you have a leak that needs to be fixed before you can continue with the carburetor adjustment.
The engine should be at operating temperature with the choke off to set the idle between 950-1050 rpm. Turn the idle skrew clockwise to increase the idle speed and counterclockwise to decrease the idle speed. If you have access to your air-fuel mixture skrew you may turn it as well, if not there is a video below on how to gain access, make sure you start with clean or new spark plugs. Gently turn the air-fuel mixture skrew clockwise until it starts to bottom out "STOP" do not over tighten as it will damage the taper on the end, now back the skrew out 1-1/2 full turns to establish a starting point start the engine and check the idle rpm's and turn the idle skrew accordingly for 950-1050 rpm if necessary, turn the air-fuel mixture skrew 1/4 turn at a time and let the engine settle for about 10 seconds, turn the skrew clockwise for a leaner mixture and counterclockwise for a richer mixture, you are seeking the highest rpm your air-fuel mixture skrew can acquire without going past 3 full turns from bottom then resetting the idle skrew back down to 950-1050 rpm If you can not detect any rpm change and can not stall the engine by turning the air-fuel mixture skrew all the way in then your pilot/low-speed jet is too big and needs to be replaced with the next size smaller. Final adjustment should be made with a clean air filter mounted to the carburetor.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day. 1979 Honda CBX Cold Start and Idle Lazy Slow Return to Idle or Erratically High Idle Honda 1979 CBX Shop Manual http://www.partsfish.com/page/oem-parts-for-honda 1979 Honda CBX Owner Manual
Sounds like the carbs were not properly cleaned or set up. Choke should cause the cold start rpms to be higher than what you are experiencing. Application of choke to a warmed up engine will usually cause the engine to stall.
Try soaking the intake rubbers in hot water, then refit and try again,if the rubbers are too hard soak them in thinners for a few hours or untill their plyability is back to normal and you will have no problem fitting your carbs.
1st-clean air filter and oil,fresh plugs,good fuel,valves adjusted correctly,check for tears or cracks in intake boots,fire in all cylininders;minimum compression & w/in10% of each other in all cylinders, and no exhaust gasket leaks. once these components are w/in specs. and operable the carburators can be adjusted, as long as they are internally clean and operating as designed.1st- set high idle, then set idle rpm, now synchronize vacuum on carburator set,now readjust idle rpm.