hif38 carb questions

[mmjosh]

hi all i bought this hif38 carb[frame][/frame]

whichis the choke and which is the throttle[frame][/frame]

where does the petrol pump pipe go and the breather pipe go and whats the other piece for[frame][/frame]

thank you

josh

[cadetchris]

throttle is the linkage nearest nearest the manifold and the choke if closest to the inlet.
fuel inlet is the lower pipe

[pistnbroke]

http://mmoc.org.uk/viewtopic.php?f=4&t= ... 38#p329736
Have a look at this

[mmjosh]

hi all do i need a different throttle cable when using the hif38 choke and acellerator bracket

[bmcecosse]

Depends what you have right now - I fitted a longer acc cable to get a nice smooth curve on the cable. Your choke cable should be usable.

[mmjosh]

yes the choke will be ok its the accelerator cable i had a look at others ant they have a nut or something on the end so it clips on the bracket then onto the throttle on the carb

[bmcecosse]

The fittings come with the carb - but it's just a standard long cable I use. I will have the car out tomorrow and sunday - so I'll try to remember to take a pic!

[Peetee]

I had to change the whole choke cable and knob to a 'twist and lock' type.

[mmjosh]

yes i have bought one of them as my choke cable is useless

[mmjosh]

hi i have fitted my car and is all good apart from one problem it was racing so i slowed it down by turning the fuel mixture screw but when i go to put my foot on the accellerator pedal it seems like its choking it then it revs and i dont know why can anyone help

cheers

josh

[bmcecosse]

Well - you don't slow it down by adjusting the mixture screw! Set the speed with the idle screw - and then the mixture with the mixture screw (surprisingly!) - until the engine speed neither increases nor decreases when you lift the piston just slightly - using the 'lift pin' if the carb has one(I don't see one in your pictures) - or a small thin screwdriver otherwise. And - do remove the silly right angle intake connection!!

[mmjosh]

here is a picture and where abouts is the screw to alter the speed and what is the lifting pin[frame][/frame]

[Stig]

I don't think the HIF38 ever had a lifting pin so you'll have to take the air filter off and use a thin screwdriver to raise the piston slightly.

The idle speed adjusting screw is sort-of in front of the vacuum advance connection, it's basically an end-stop for the throttle cable if that makes sense.

[mmjosh]

ill check tommorrow

[bmcecosse]

The idle screw is slightly to the left of the braided pipe (in your picture) you have fixed up to draw the fumes away from the breather. It operates vertically. The mixture screw is round the other side -[frame][/frame]
horizontally at about 10 o'clock looking down on the carb - item 7.

[mmjosh]

hi i adjusted number 7 but not the other one

[bmcecosse]

Well - number 7 is the idling mixture screw - not the idle speed. So once you get the speed where it should be - adjust #7 again until you get the smoothest idle = probably need to balance the two adjustments back and forth a couple of times till you get it right.

[mmjosh]

thank you very much for helping me out

[bmcecosse]

Is it on an AAA needle ?

[mmjosh]

im not sure what needle it is