75 CB750 wont idle with rebuilt carbs & no airbox

Posted by harsh94blu on Jul 21, 2012; 5:29pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/75-CB750-wont-idle-with-rebuilt-carbs-no-airbox-tp4025625.html

Hello Forum,

Im having an issue with my 75 cb750. Its in the shop but the mechanic says he stumped. He cant get it to idle. It does start and run but the min you let go of the accelerator it starts to die and it dies.

The carbs have been rebuilt and i don't know much of the terminology but here is what my mechanic says he did.

First all gaskets and jets have been replaced. he says the stock carbs come with 100 jets. he has tried 103, 115 and now 125 jets and he says it has improved but still dies.

the carbs do not have an air box, we are doing straight individual air filters for each carb.

The bike was also fitted with a 4 -2 -1 header.

He says because of the straight filter and headers the bike needs more fuel, but he hasnt been able to level it correctly.

Does anybody have any ideas. Im converting this bike into a cafe racer and this has been an on going problem now for over a month. If anyone here has had this issue or has recommendations on jet sizes, leveling etc.. your help is greatly appreciated.

Thank you for your help.
Max