oh, i almost forgot thanks for reminding , wait give me 15 minutes. just got home  having early dinner.

2 hours to tune an SU carb ???? You must have had a long lunch in between.

And yet, you couldn't be bothered to take a picture of the mythical multi colored sump guard attached to the pink wonder.....

sorry guys, maybe i was just carried away too much because i was tinkering with my HS4 yesterday, i was tuning it for 2 hours until i got the proper silky smooth tune no one has ever achieved. i think i tuned my carb at it's best, the car runs so smooth and quiet... now i can appreciate hearing the bird chirping.

If you'd stop typing for a minute and read what is in the thread already, you'd have read what Se7en wrote about a lever.

 A HIF carb is NOT like a typical carb when it comes to the idle mixture screw. A HIF has a vertical main jet and needle (preferably straight) like any SU carb. But since the bottom of the jet sits down inside the fuel bowl, there is not a mixure adustment nut as you would find on a HS type carb. To overcome this, they added a lever and positioned the adjustement screw above the fuel level so it wouldn't leak. In the attached picture are two of these levers. (The carb only has one!). The lever sits with the pointy end having a thin notch UP. The wide part at the other end goes down. The bottom of teh jet gets hooked into the key-hole shaped opening ( left side in picture) and the other side is secured with a small bolt and spring so it can rock up and down. Now we get the the adjusting screw. It comes in to the side of the leve away from the jet. It has a very thin tip that fits into the slot. when the screw is turned in, it pushes the top of the lever toward the jet. The lever pivots at its back end and the keyhole shaped loop pulls the jet down, richening the mixture.

Got it?

what? what does tightening a bolt have to do with adjusting a Carb???????? I guess you could say Right to Rich Left to Weaken

mal, isn't it that the "theory" righty tighty and lefty loosy is standard?  whatever angle of bolt and nut has?  as long as the nut is facing you and not in the back.

Wrong again !!!! This is a HIF not HS carb totally different kettle of fish. And looking at a HS carb from the top clockwise makes it richer.

I just want to clarify, im kind of confused, isn't it that turning it clockwise allows the carb jet to go up? and since the carb needle is tapered, the whole idea of jet going up will limit the flow of gas? thus leaning the mixture?

And turning it counterclockwise lowers the carb jet thus allowing more gas to flow because the needle is tappered? thus making it rich?

I was just curious if this happened after you changed a component or did it just start happening without any advance notice?  The oil should be fine.

Choke comment is important, as it is a separate, added fuel supply source in an HIF.  It must be in good working order.

The other comment that is critical is:

"Turning it clockwise richens, counter-clockwise for lean"

You are levering the jet with the tip of that screw, so clockwise screws it in and the screw tip levers the jet bracket down to richen the mixture, and counterclockwise levers it up to lean it.

Are you turning the idle mixture screw (jet adjusting screw) the prope direction?

Turning it clockwise richens, counter-clockwise for lean. 

Turning it "fully lean" would make it come right out.

i did take apart the choke

it free and woking

one of the o rings is a little hard

I did take apart and cleaned the whole carb

but i did not check if the jet adjusting screw was working or not

my classic mini started running rough and now wont idle ..............

                                               check the choke ....might be stuck ....

thanks for the reply 

ill check that out tomorrow

i am using the actual SU carb oil for the dashpot

I had an issue similar to this and the issue was the jet.  My reccommendation is to remove the dashpot and rotate the mixture screw from rich to lean and vice a versa and verify travel of the jet assembly.  Im not sure what type of oil you are using but that could also be the culprit.

my classic mini started running rough and now wont idle

i got  the mixture screw set fully lean and runs like is very rich

when i lift the piston inside the carb the engine revs up

its like it needs more air

the carb is a SU Hif44

Any suggestion out there?

Thanks in advance

-1976 Mini

-1275 engine

-SU Hif 44 carb single

-Pertronix ignitor electronic ignition