Re: 1981 CB750C Carbs Pods vs Airbox

Posted by Barnacle442 on Jul 30, 2013; 6:07pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/1981-CB750C-Carbs-Pods-vs-Airbox-tp4043715p4044248.html

I don't have pods. I am using the stock airbox. I replaced the exhaust with a 4-into-1 system. According to the Honda manual this will require re-jetting. I'm not a mechanic and I know that somebody here has to know what size jets to get for this setup or can direct me to the information I seek. Can someone here direct me or inform me so when the time comes to rebuild my carbs I can speak intelligently?

Also, the engine only produces vacuum on the intake stroke. For three strokes each cylinder produces no vacuum. The airbox is designed to distribute the vacuum from each cylider to the other three carbs while their cylinders are in the compression, power and exhaust strokes. I won't pretend to know how CV carbs work but I know a thing or two about plenums.