Questionhey , how ya dooin? I Installed a fuel filter on my 84 nighthawk 750 S, and it swallowed some small rubber chunks, I removed carbs and followed cleaning procedures in my manual, but couldnt get 3 of the 4 slo jets out to clean, busted up the tops slightly... # 4 cyl still showing slightly rich, somewhere along the way I disturbed the balance screws.. Can this be attributed to that action? If I need these slow jets out, would a repair guy have a method, or should I look for replacement carbs? I have an appointment 4 balancing next week.
Thanks, Frank
AnswerFrank, try a brand new screwdriver that exactly fits the end of the idle jet slot. Tap the screwdriver down with a small hammer a few times to both improve the screwdriver fit into the damaged jet and to help loosen the varnish bond at the jet threads. If they still don't come out you might try a tiny EZ-OUT kind of tool to drill into the jet and grab the insides, then turn it out. If they break off in the carb body, then you are pretty much done fooling with that set.
The CB700SC model sold down here should have almost the same carb rack, but perhaps different jetting for the larger displacement engine.
There a dozens of carb racks on Ebay at the moment under "CB700SC Carb" search. Just found a rack in Canada for your year and model...
http://www.ebay.com/itm/1984-CB750-SC-Nighthawk-Carbs-/200764130493
I changed the search term to CB750SC carb instead.
If you leave the tops and slides out of the carbs, you can look carefully at the amount of light coming out beneath the throttle plates and adjust the balancer screws until they are all matching. That should get carb synch pretty close without paying someone big $$ to hook up a $80 tool to do it for you.
Bill Silver
