Topic: choke

[yorky10]

why will my 400 four only run on full choke,carbs have been sonic cleaned.yorky10

[captain hopeless]

Are the carbs set to stock settings? (i.e. air screws, floats, needles, jets, etc). More specific details and symptoms might help with diagnosis.

It's probably running lean somehow. Alternatively if it won't even idle then maybe the idle screw is not set properly, requiring engagement of the fast-idle cam on the choke lever?

[Schnell]

Stock airbox or pods?

[yorky10]

as far as I can tell its as it left factory,its not been used for 20 years,so I had the carbs done by a pro,ihave checked timing tappets,float height,is it fuel starvation?yorky10

[iron_worker]

Did he properly rebuild them by dissassembling or did he just dip the whole carb in an ultrasonic cleaner and call it good?

Sounds like you either have a massive vacuum leak or your pilot jets are completely plugged up.

IW

[bjbuchanan]

With carbs there is usually a short list of "pros" that do the job correctly, especially on motorcycles. They get by with cars because the passages are usually considerably larger, comparably atleast. The bikes get clogged up bad and easy too