Re: Carb cleaning questions

Posted by seestheday on Nov 10, 2011; 4:36am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Carb-cleaning-questions-tp3485857p3495758.html

I took a bunch of high quality pics so you guys could see the float bowl and diaphragm easily.  I resized the images using the upload feature on this board, so hopefully the aspect ratio isn't all messed up.

I'm pretty sure I need an o-ring.






Other updates on today's progress.  

I pulled the body out of the pinesol soak and cleaned everything I could using a mix of instructions from the repair source write-up on this forum and the manual that mike posted earlier in this thread.

Step 34 of the write-up says: " Open the main butterflies (not the choke butterflies). Insure that the very small holes in the bottoms of the carb throats, where the butterflies rest, are clear. If clogged, try running a small wire through them and chasing that with a blast of carb cleaner and then compressed air. Note: the CB750 VB42 carb has three (3) such holes including the pilot hole about ½” closer to the front or head side of the carb. The CB900 VB43 carb has five (5) holes including the pilot hole. "

How deep should the wire be able to travel?  On my CB750K there are three holes, and on the one not covered by the butterfly the wire easily slid down fairly deep with no resistance.  For the holes either partially or fully covered by the butterflies the wire did no want to go down very deep at all.  I'm hoping that this is ok.

Another note: The guide that mark posted describes in detail how to check to see if the accelerator pump nozzles on each carb are clear.  I'm happy I did this because one of mine was obstructed and 2 of the others were partially obstructed.  I'm hoping to see a big difference from that.

I think I have all of the cleaning now done and plan to pick up some new screws (stripped one getting it out) and any missing parts tomorrow to start the rebuild.