Found a spare stock , plastic air-filter box in my shed, cleaned it up, and drilled 6 x 3/4" holes in it per Calver (Thanks again Spitz)

Just waiting now for the "stock" K&N filter to arrive now.  Can't stand the suspense. heh

Er....actually charrison, you are moving the hole...the needle moves with the piston, and should be set so the step on the needle is flush with the bottom of the piston... And it is an HS4, but not all HS4's use wax stats....

You are screwing the tapered needle up or down in the "hole" to change the fuel flow. 

The hole stays put, so if you screw the needle in (and up) you'll lean off the mixture.

It's an HS4 with a Waxstat.

The Waxstat is a SERVICE ITEM - something that has been forgotten in the mists of time.
All the fiddling in the world will not make the mixture consistently right once it has failed.

Mike, Mike, Mike.... You're looking for directions?????
You, of anyone, should know the guys mantra, "Only read the directions as a last resort."
Now get under there and twist it one direction. If it makes things worse, go the other way.
If it makes things better, keep going until it makes it worse & back off a flat or three...

Come on, you're a guy. You don't need no stinkin directions. You and your son proved that on the rally.

Raise the jet to lean it out, and with the car warmed up and running, lean it out till the rpm no longer comes up...reset the idle to about 850 and then recheck the mixture by raising, or lowering to achieve the highest idle....if your exhaust and plugs are still sooty after a cleaning and a blast on the highway you will want to check into replacing the jet and needle..... Be sure your float isn't sinking....mixture shouldn't change with time...

Mike, looks like you have an HS4.. are the mounting bolts diagnal across the intake?

Mike you will find that when you lean it out the idle should come back up to normal. I do the opposite of Steve looking from the TOP counter clockwise to make it leaner (screw in) and clockwise (screw out) to make it richer, you have an HS4 carb be sure to top off the oil in the dashpot if you have not done so in a while. To make things more complicated the HIF carbs are the opposite.

BTW put a length of hose on the vent tube on top of the float bowl and run ir away from the exhaust area, if yours overflows as it is it will drip gas all over the exhaust manifold.

Thanks a lot guys.  Spitting rain here now, but tomorrow if I get a chance I'll lean it out just a titch and then I suppose I'll need to adjust a screw to set the idle up a bit also as it's running at a fairly low RPM.

I guess that's probably a mechanical stop adjustment of sorts?

I always want to say it's an HS2 carb - is that correct? I'll break out the Haynes manual.

Appreciated !

 

If you imagine yourself under the thing clock wise to lean and rich the other way. I can't see the part I'd like to see. If a waxstat they fail to very rich. There would be a portion of the jet tube the sixe of a nickel at the bottom of the jet if wax stat. You can convert with proper parts or go back with new waxstat jet. Keep count of flats if you move the adjusting nut. The other thing could be a worn needle or jet tube if spring loaded needle.

Steve (CTR)

I always have trouble remembering which way as well. I usually would end up taking the dashpot off and watching the needle seat. I would keep close track of where I started and how much I went one way while watching to see which way the seat went - up for leaner, down for richer.

I think that translates to trying to twist the nut "up" its shaft will lower the seat - making things richer? (Though I may just be making things "clear as mud".)

Here's a very old picture of my carb. 

Some 7 years ago I remember tweaking some large nut up under the carb to lean out the mixture.  It's still running a bit rich (I think).  22 hrs to MME 2012 and back (total) had me thinking I might've had a gas leak, but I think it's just the extra gas coming right back on through the whole system.  Exhaust tip is black, and when I first start it up, it blows "soot" out the tail pipe.  Plugs look like they've been sprayed with a fine mist of flat black paint.  Not goopy/gunky, but just black/dusty.

Now, I could find a manual for my carb and look it up, but I have no idea which carb I have , nor which way to adjust the large (was it 13/16th?) nut.

Up/in/clockwise, or down/out/CCW? (if I am remembering it right)

My idle has slowly got lower and lower over the years, so I suspect I'll need to play with that too.  It's around 500-600rpm which seems too low.(to me)

Thanks