3 replies to this topic

[RELF]

I have just replaced my choke cable on a SU HS2 carb. Can anyone advise on the required adjustment before clamping the wire? I read somewhere that the first 1/2" of movement is only for fast idle control. The choke wire is the old push-pull style which does not lock by twisting. Thanks.

[Ethel]

As long as there's a tiny bit off slack to ensure the choke always returns fully. It's the choke mechanism on the carb that's in 2 parts - 1st part moves the cam to open the throttle for fast idle, pulling the cable further moves the 2nd part for mixture enrichment. If you look there's probably a little arrow on the choke cam, you adjust the fast idle screw (to increase the rpm) when it's lined up with the arrow.

[RELF]

OK that's fine, Ethel. Connected up the cable but the choke knob doesn't stay out by itself beyond the initial 1/2" - when pulled out further it just springs back to the 1/2" position. I've tried adjusting the slack at the carb in various positions but it doesn't seem to make any difference to the choke knob behaviour. Perhaps a twist lock choke cable would be better(?). Any thoughts? Thanks.

[lrostoke]

or a clothes peg