9 replies to this topic

[mini1976]

Can some please help me, Ill try and get a pic up soon so you guys can comfirm that my carb is a HS4, but im trying to follow the directions in the Hainse manuel and just cant seem to see where its located. Is it a bit pin sticking out the side of the carb, or will i need something small to put in a hole to push it up?

Just need a pic showing me where it is please

[1984mini25]

Hear it is, it can be a to find at times as you need to keep the air box (if fitted) on will doing it.




With the engine running (full warmed up) lift the piston-lifting pin till it hits the piston and then a further 1 mm on the side of the carb and listen to what happens,
If it cuts out the mixture is too lean, if the idle increases the mix is too rich and if nothing happens the mixture is about right.

The Haynes manual goes into much more detail, Pages 4A .15 and 16 fuel systems.

[my mini rulez]

what is it for??

[1984mini25]

what is it for??

So you can set up the running of the carb at home.

[Herman]

Do HIF44 carbs have lift pins?

[Garagiste]

Cheers for the pic, Haynes was baffling me with that description too!

[mini1976]

Thanks for the pic 1984mini25. My car looks the same as yours (i think) but i dont have a lift pin :'(
This is what mine looks like

 DSCF2025.JPG   449.01K   8 downloads


Is this a HS4? ANd if so wheres my lift pin?

Heres another pic

 DSCF2030.JPG   488.72K   5 downloads

[Dan]

Not all HS carbs have a piston lifting pin, and no metric HIF carbs ever had them (imperial HIFs did). I think it was deleted around the time that Waxstat jets were introduced but I'm not sure. That would make some sense though as the Waxsatat makes it a much less useful tuning tool. I've always found the plateau method of tuning more effective.

[mini1976]

Not all HS carbs have a piston lifting pin, and no metric HIF carbs ever had them (imperial HIFs did). I think it was deleted around the time that Waxstat jets were introduced but I'm not sure. That would make some sense though as the Waxsatat makes it a much less useful tuning tool. I've always found the plateau method of tuning more effective.

Oh ok, So whats the plateau technique? How do i do it please?

[Dan]

It'll take quite a bit of explaining here, it's in Haynes if you want more detail.

As you turn the jet into the carb you will notice the revs gradually rise and then start to fall back again as you go further. Between the rising and falling there is a plateau where the revs remain the same whatever the mixture which lasts for 6 flats of the jet. The correct jet position is two flats back from the edge of the plateau. You need a good, stabilised tacho. The car one isn't really good enough and is in quite the wrong place for this, but you can get tuning multimeters with tacho's built in which make this easy. You can't just do this on its own as you need to tune the whole thing at once but as I said, there's more detail in the manual.