Re: Carb cleaning questions

Posted by seestheday on Nov 13, 2011; 6:21pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Carb-cleaning-questions-tp3485857p3504920.html

Thanks for the tip Donald, and yes I always wear the goggles when working with the carb cleaner, but thanks for looking out for me .

That said, your comment on them only passing air threw me for a loop and made me question how I understood the carbs worked so I looked up their theory in a book and found the following picture explaining what those holes are.


This made things really clear for me.  The one small hole that I was able to easily pass the wire through was the pilot discharge port, and the two small holes where the wire wouldn't go in very deep are the holes to the pilot bypass chamber.  They shouldn't go too deep as the bypass chamber is very shallow.

According to this diagram, fuel goes through these holes, not air.  It is essentially sucked out of the bypass chamber via a vacuum as the throttle plate opens up from idle.

The book is "Motorcycles, Fundamental Service and Repair" and that pic is on page 163 if anyone cares.  It mentions that it a HD carb diagram, but the principles should be the same.

Always appreciate your input though, I seriously would not have been able to get as far as I have with these carbs without input from you, tools and Mike.