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

Posted by shinyribs on May 20, 2013; 7:41pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Help-me-get-rid-of-the-bog-72-cb750-tp4040988p4041002.html

I run a 4-1 with a very open muffler situation. I also have the factory air box. I was previously running pods and had to rejet to accommodate the factory airbox going back on.

My previous jetting(for pods) was 125 mains and 42 pilots. My idle mixture screw is at 3/4 turns out. But not all idle mixture screws are the same! Some are solid tipped,others have a hole drilled through the end of them. Mine have the holes.

With the factory airbox back on the bike I was getting an extremely rich bog at WOT with the 125 mains. I dropped down to 120's (all else being the same) and it was no better. I didn't have any 115's to try so I dropped again to 110's. The WOT bog is gone but the bike feels like it may need a bit of fuel at WOT now. I'll probably raise a needle instead of going to larger jets.  

Long story short,I think 120 mains might still be too rich for a stock airbox and a 4-1. JMO.