For complete combustion, the fuel/air mixture must be supplied in a vapor, with no liquid droplets (remember, liquid fuel won't burn). So you set the idle speed to 850rpm or so, then use the volume screw to get the fastest idle, then reset the idle speed using the throttle arm screw. Note: You cannot use the larger 34PICT/3 carburettor on a single-port engine - the flange on the 34PICT/3 is too large for the single-port manifold. Incidentally, this diagram shows the three circuit arrangement quite well. You are the BEST detail guy! They sit on the twin port manifold with a 30/34 adapter plate. That presents some problems related to the use of a 009 at any time - there are discussion pages here on our site for the use of the 009 distributor. 34 PICT-3 Stock Replacement Carburetor for the Type 1 and 2 Bug, Bus, Ghia & Thing with Electric 12 volt Choke. See Photo #9 to view the drilling downwards which intersects with the angled drilling. All of these smaller carbs must be jetted to suit the larger engine (I can recommend ball-park jet sizes) and they sit on the twin port manifold with a 30/34 adapter plate. to the Cylinder Heads on either side. Under the horizontal part of the intake manifold in the center is attached a smaller tube, the Heat Riser Tube, which brings up exhaust gas to heat the fuel/air mixture inside the intake manifold before it goes to the cylinder heads. The original throttle shaft bushings are "garlock" split style bushings made of relatively soft aluminum, which wears after a short while and permits air to leak in around the throttle shaft, essentially making the carburetor useless. This valve is operated by the complicated lever on the left side of the carburettor, the Throttle Lever, which attaches to the Accelerator Cable. Photo #10 reveals the continuance of drilling into the top half of the Carburetor which matches that of the drilling in the bottom half of the Carburetor. On a 1600cc the main jet should be a size 127.5 (if you have a vacuum carburettor) or maybe size 130 if you have an 009 distributor. Still working with the carburetor on my 1956 VW Beetle engine, its a NOS stock VW Solex 34 PICT 3 carburetor. 34 PICT/3 Carburettor Overhaul, Related Topics There is another connection point on the fuel pump with a metal or rubber line attached to it. Buy a 1969 Volkswagen Beetle Carburetor at discount prices. Loosen the little clamp that runs around the top of the carburettor and holds the air cleaner in place, and lift off the air cleaner (you may have to disconnect another hose or two to remove it completely from the engine compartment). On the bottom of the carburettor bowl on the left side is a large nut. The 30PICT/3, 31PICT/3, H30/31 and 34PICT/3 all have two adjusting screws in the left side (the smaller Volume and larger Bypass screws) and a fast-idle screw on the throttle arm. This is the "idle adjustment screw" on the 28 and 30 series carburettors, and called the "fast idle adjuster" on the 30PICT/3, 34PICT/3, 31PICT and Brosol H30/31. Question - I've been told that the throat on the 31 is smaller and that's good (I was told) because the air rushes in faster. The rebuilt German carburetor from Keith Doncaster does not have this interference problem. Interference, Carburettor/Distributor If you look closely on the left side of the carburettor you will find one or two adjusting screws. Jay: The first of that series carburettor came with no power jet (it was designed for the 1300 engine), but the later versions have the power jet and this version is OK on a 1600cc engine. Carburetor Repair Kit. Everyone loved the new design. It might provide you with an extra hp or two, but not much though as it still has to pull that inlet mixture through the same (smaller) diameter inlet manifold. Inside the heads are the Intake and Exhaust Valves. Question - I have a simple question about the Solex 30 PICT/2 carburettor. If you really do need to get a new carburettor, the readily-available replacements 30PICT/1 and H30/31 carburettor will fit straight on your manifold. In photo #1, below, this identification is abundantly clear. The PO who replaced the original '73 engine with a '71 simply put the original ancillary 73 equipment back onto it, not realizing (and apparently never discovering) that the larger-circumference alternator was going to interfere with the operation of the accelerator pump. Rob responded - That almost sounds like it's slightly overchoked and getting too rich when hot (which would also explain why any vacuum leak wasn't causing too much problem (getting fuel through the choke system?). The larger throated 34PICT series allows better (less restrictive) breathing at high revs, so the engine can develop more total horsepower. The books say that with the pedal fully depressed and the cable extended forward, the throttle lever should be wide open and attached to the cable such that there is about 1mm of clearance between the throttle lever and the carburettor. Carburetor for VW Beetle 30/31 PICT-3 Engine 113129029A 027H117510E Single Port Manifold Automatic Choke Carb with Gasket 4.2 out of 5 stars 34. We provide the classic VW hobby with tech tips, project advice, and quality parts for VW Restoration, VW Performance and Custom Aircooled VW projects. Air Inleakage Also make sure the accelerator pump is giving a full squirt, and that it goes straight down the throat - doesn't splash on anything on the way (twist the brass delivery pipe a little if you need to). For extra power when needed. From elsewhere on our Web page - You cannot use the larger 34PICT/3 carburettor on a single-port engine - the flange on the 34PICT/3 is too large for the single-port manifold. This is the throttle lever; the cable is the accelerator cable. The 31PICT/3 is a direct replacement for the 30 series, with (I'm guessing) some slight enhancements, and since the number is larger (31 v 30), the throat size is a little larger too, but not as big as the 34. Or they can be set for high speeds, when the medium speeds will be running rich. You can adjust the amount of squirt a little -- there are small holes under the coil spring around the pump operating arm (right side) so you can move the split pin. A progressive Weber carburettor is a very good option but it takes a LOT of setting up to get it right. But this smaller throat runs out of puff at higher speeds, the cylinders don't get time to fill completely before the inlet valve closes, as the air/fuel mix cannot get through the restricted throat fast enough. This assures that the engine has a high idle speed when cold (or it would stall), but the idle speed reduces to normal as the engine warm up. 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