9 replies to this topic

[DeanP]

Hi I'm after some help on what the forum things is wrong with my choke mechanism.

Basically the mixture control lever drops off the fast idle screw acelerator (see the video). Therefore I have choke, but the engine doesn't run faster on start up.

Is it the return spring? The lever returns, but has sideways movement and does jam on the side of the screw. When it jams the choke remains open.

Could it be that the lever has simply worn?

Any advice, much appreciated?

[Gulfclubby]

There is something wrong, the choke shouldn't have any sideways play.

[DeanP]

Ok thanks, at least I know where to start.

[Brams96]

Gulfclubby is right there seems to be quite a bit of sideways movement on the choke lever, it does have a tiny bit but not that much. Has the carb been stripped down & rebuilt with new seals and gaskets? There must be something worn to cause that movement.
Also looking at the video the choke lever doesn't start centered on the adjustment screw, are you sure that the throttle lever hasn't been bent out at all?

[bmcecosse]

I don't see what the problem is Dean - can you move it by using the cable - rather than with your hand? The hand seems to be moving it sideways........

[Brams96]

I don't see what the problem is Dean - can you move it by using the cable - rather than with your hand? The hand seems to be moving it sideways........

Regardless, the choke lever shouldn't move sideways that much & as you can see in the video the lever actually slips off the adjustment screw & sticks, which it also shouldn't do.

[DeanP]

Brams is right, yes the adjustment screw isn't quite centred. The choke lever does have side ways play which causes it to slip off the screw. I'm not aware of the carb being stripped, certainly not since I've owed it. I know it was taken off to fit a stage one, therefore it could have been dropped I guess. Bmc, the choke does operate correctly with the cable, but now I know there shouldn't be any sideways movement.. that'll be the first plan off attack.

Thanks everyone. I'll re-post when I find the problem or future reference.

[DeanP]

Also I'll look at centering the throttle lever to the screw.

[DeanP]

are you sure that the throttle lever hasn't been bent out at all?

I think this was the problem. Basically I have bent the throttle lever back in line with the adjuster screw. The choke still has some sideways play, but it doesn't appear to affect the function, in fact it works better. Therefore.... all now works perfectly!!!

Makes me wonder how it came to be like it in the first place though.

Thanks everyone.

[Ethel]

The hif choke is the shaft of the choke cam (it's like a rotary valve). If you take the cam off, you'll find a retainer plate underneath, it sounds like the screws holding it on are loose. Carefully note how the choke return spring goes first - it'll save some head scratching later.