Re: pidjones rat bike project - '79 CB750F

Posted by pidjones on Oct 18, 2018; 11:31am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/pidjones-rat-bike-project-79-CB750F-tp4063756p4063783.html

Finished cleaning, assembling, adjusting and testing all carbs. Had to change out the acetone that I run the jets and such through in the US tank twice because it was getting too contaminated with varnish! First, just pressure testing the float seats to see if they will hold ~2 psi for hours. Had to make a tool for lapping the seats as some were pretty dinged. Easy to pressure check while cleaning the next carb. Then after ganging them up I checked them all. Had to make the little washers on the pilot screw o-ring as they were all missing. Also bypassed all of the air cuts. Set the pilots 1/2 turn more open to accommodate. New accelerator pump is on order. This one is too stiff and often hangs up.

One thing the pressure test doesn't tell you is if your overflow tubes are cracked! Dooo. #2 and #4 both cracked. So, solder? JBWeld? How about - is heat shrink tubing gasoline proof? Let's find out! At least all of my float valves are seating well. But, I had to make a drain screw for #4 because it was too far corroded to clean up. Made one out of a bolt. Didn't worry about a screwdriver slot or an o-ring groove. This IS a rat bike!

All that remains before re-mounting is a new accelerator pump. I just know that if I order one from a USA source, the China pump will show up!