cbuckle
XS650 Enthusiast
Probably a premature thread but just trying to find out if my fuel mixture screw should be soo closed (TX74’ BS38 carbs). It is maybe ¼ turn open on both Carbs, but really wants to be shut fully off when performing the “dead cylinder” method to obtain the best idle. I start off at 0.75 turns open as per the carb the adjustment procedure and the idle only goes higher when closing the mixture screw. Everything is stock on the ’74, minus running air pods. Jets have been cleaned. Floats confirmed at 24mm, but now at 25.5mm as an experiment. Needle clip in stock slot 4. Pilot jet 45, assume main jet is stock (no identifiers), Enriching system clean and closed/off, gaskets looks good.
My only guess is air leak somewhere? Or where can the additional fuel be coming from?
Can someone please confirm is the fuel mixture screws should be almost closed.
Also, my carbs lack vacuum barbs but see you can tap them in above the throttle body, or in the manifold.. any advise whether I should be drilling out my carbs or manifold to install some barbs to ensure sync or am I just over thinking.
My only guess is air leak somewhere? Or where can the additional fuel be coming from?
Can someone please confirm is the fuel mixture screws should be almost closed.
Also, my carbs lack vacuum barbs but see you can tap them in above the throttle body, or in the manifold.. any advise whether I should be drilling out my carbs or manifold to install some barbs to ensure sync or am I just over thinking.