Re: Help me get rid of the bog! 72 cb750

Posted by trapper on May 24, 2013; 1:52pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Help-me-get-rid-of-the-bog-72-cb750-tp4040988p4041195.html

Adjust the floats to make sure they're sitting right. You'll want them to go up enough to fill the bowl and to push the needle gently (not jammed) into the seat to stop fuel flow. As everyone said, this does sound like a pilot jet issue. But, if it did run fine last year, I would remove them and give them a good cleaning before you try to upsize them. Remove the jet and tube it mounts in. Clean it and check all the little holes for any clog. When you put them back, just screw them in snug. Don't wrench down on them... Common sense I'm sure but I have gotten into some ugly carbs before cuz the previous owner wrenched everything in TIGHT....  All this is easy to do and can be done with the carbs on. But taking them off and giving them a good bath never hurts.

As for the mixture screw. Do the cleaning first and adjust the floats. Once there fire it up and see how you are. If you need to work on the mixture, each one can be a little different. How I do it is, I set them all to about 3/4 to 1.25 turns out depending on the bike (mine is 1.25 but I'm jetted). Clean your plugs then take it for a short ride. Then remove each plug and inspect. Adjust each carb richer or leaner based on how it's respective plug looks.

*Edit- Also, when screwing in the mixture screws, again only turn them till they stop. Don't over tighten or you will strip out the inside. Honestly finger tight in fine. Especially cuz you're not staying there.