Author Topic: 3.5 idle screw turns out (DOHC cb750)  (Read 60 times)

Offline lifeon2

  • Posts: 13
3.5 idle screw turns out (DOHC cb750)
« on: Jun 16, 2019, 12:23:26 »
Hey all, first Iíd like to say thanks for all of the info you all have posted on this site. Iíve been able to search the site and get great advice since the start of my cb750 build.

1981 cb750c, 4into1 exhaust pipes, gpmoto shorty exhaust, pods...

Do I need a bigger idle jet if Iím at 3.5 turns out on these machines?

My question revolves around the idle fuel mixture screw. Iím following advice from others who have built something similar in the past. They recommended putting a 75 idle jet in each of the carbs and turning the idle jet 3.5 turns out. Iím under the impression (but not 100% sure) based on reading up on fuel mixture, that the idle screw should be 1.5 to 3 turns out, if it is over 3 a new bigger jet should be used, if under 2 turns out a smaller jet is necessary, etc...