Re: please help cb750 wont run!!!

Posted by pwbcktftii on Nov 29, 2012; 10:55pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/please-help-cb750-wont-run-tp4032807p4032816.html

Howdy, The black flecks you are seeing is rust particles from the gas tank. You will need to remove the carb bowls. If pre 77 then there is a spring strap that holds the bowl on. Push it forward & the bowl can be removed. Then remove the pin for the float. Float & needle will fall out. Use 10mm socket & remove float valve seat & fibre washer. Use 8mm tool & remove main jet holder w / main jet. put some kind of container under carb (s) & let some gas flush the fuel passages out. Use air nozzle to blow out carb bottom. Clean main jet & holder you removed. Clean float valve seat & screen if equiped. Re-install seat & jet holder (don't over tighten - brass parts). Put float needle up in seat, hold with finger from rear, slide float in from front over needle & re-install pin. You may or may not need to re-jet. Make a note of what ones you have while carb is apart. If brass parts are very dirty you will need to get the 1 gallon parts cleaner kit from an auto parts store & soak the parts. ($30.00) Now that I said all that, if 77, 78 Carbs need to be removed from the bike & dis-assembled then cleaned. You may or may not need to sync carbs afterwards. Now you need to address the rust in the tank or problem WILL return. I like the Kreme kit or replace the tank. Hope this helps, PHILLIP