PICT carbs (34PICT) RPR 34 PICT-3 Carb (12 volt electric choke) RPR 34 PICT-3 Carb (12 volt electric choke) What you are mainly looking for is the condition of the carburetor. Running a 130 main jet. It is very easy to check the idle cut-off valve to make sure it is functioning properly. The fuel flow through each jet is determined by the airflow which creates a low pressure area near that jet. Only 13 left in stock - order soon. $9.81 $ 9. 1776CC w/ 34 PICT 3 Solex Jetting Recommendation. Most gasoline in the USA now has at least 10% Ethanol added (E10), and in other countries, SOME fuel grades have 10% ethanol added. Jump to Latest Follow 1 - 12 of 12 Posts ... And going up a size or 2 on the idle jet usually cleans it up some more if done together with the timing Click to expand... 32 total, total is all I ever check. Reach through the jet plug hole (main jet cover plug (14) was removed previously) with a screwdriver and remove the main jet (17). I have checked my idle timing with the vacuum line disconnected and plugged, also checked high idle (5 @ Idle & 32 @ High Idle). In these later models, you can easily change the jet with a medium screwdriver either with the top of the carburetor removed or with the carburetor completely off the car. If the fuel/air mixture is too lean, the engine will run very hot, stumble, and misfire -- and burnt valves can be the result. The emulsion tube mixes air from the air corrector jet with fuel from the main jet, and controls the mixture from the discharge nozzle at all engine speeds that the main jet is working. The carburetor idle circuit controls how much fuel you have at idle. The carburetor was a little "leaky" around the shafts. Sold by JGCParts and ships from Amazon Fulfillment. If it has the small main jet, then you'll get better performance and easier tune-ups if you change it to a size X125 (for 1200/1300/1500cc engines) or a size X127.5 (for 1600cc engines) and change the idle jet to a size 55. Run about 100 miles and then look at the tail pipe. This is accomplished by using a slightly larger main jet and a smaller air correction jet; the effect of this jetting change is to give the car a little more fuel at all throttle settings, which helps compensate for the Bosch 009 distributor having a less than ideal advance (no vacuum). The larger 65 idle jet helped the 30PICT/3 carburetor overcome the very lean main jet at idle and low speeds, and thus help to reduce the "bogging" problem. Disconnect the electrical lead from the valve, then touch it to the connector again. The adjustable jet would work with any of the Solex carburetors which have the jet mounted horizontally inside the carburetor. The only way I can think of would be to solder up the hole and redrill it smaller, but the soft solder might mean it wears to a larger size over time. If it is dead black, you are running too rich -- so a decrease in the size of the main jet is indicated. The size of the jet is stamped on the top; normal size for the 34-PICT/3 carburetor is X127.5 (1.275mm diameter hole). If it's working, you'll hear a clicking sound as the relay pulls in. Air correction jets are harder to find. To compensate for this, an air correction jet is inserted in the fuel delivery circuit after the main jet, which starts to add air to the fuel emulsion as the airflow increases. Main jet = 132.5. Rob replaced the air correction jet with a 140Z, and at low-middle speeds there is no discernible effect. Sounds like a good starting point! A Volkswagen friend in England recently e-messaged me about a situation with his carburetor. There is enough variation in fuel types, wear and tear on engine and carburetor, altitude and so on that you might need to experiment a little. Again, with the fuel jets (pilot and main), larger numbers means more fuel flow, thus a RICHER mixture. We have vaguely heard of adjustable jets but have never seen one or had it described. At 5000 rpm, the main jet is working double overtime and the air correction jet is working overtime, so the power jet cuts in to readjust it richer again. Brosol/Solex Main Jets 135, Compatible with Dune Buggy. The H30/31 is the largest carburetor you can use with the normal single-port manifold. Jetting With the Centrifugal-Advance (009) Distributor, Tuning the 009 Distributor/ up enough to allow the linkage to clear the alternator . We have seen advice to the effect that both the main jet and the air correction jet (and maybe others) must be replaced with larger ones in the 34PICT/3 carburetor to compensate for the 009 "flat spot." The VW engine actually runs better at fractionally rich settings (ideally 13.8:1 rather than 14.5:1 according to Bob Hoover). All three of these jets can be changed. A sooty plug means the idle jet might be a little large. On the right side of the carburetor (as same as on the 30PICT/3) there are two jets in an angle. Use a steady throttle - minimum acceleration. A guy in Yakima sells the whole kit and jets them for a stock 1600. Idle jets are available in small increments. This jet helps mix the fuel when the throttle butterfly is part way open, and so if you make it too big, it will let in too much air, and the engine will hesitate because of that. No blue fumes, so the piston rings are well installed. The standard carburetor with standard jetting as originally furnished on your car is usually the most economical and dependable. I remove the top of the carburetor, then run a thin screw driver (which avoids the coil) through the plug hole to get to the jet. The 205L number is a Bosch number, the other one is a VW number. Many thanks, John!). to the back of the engine, in an angle) is a: g f 50 and the other: g f 50. A clean plug with a light grey/tan look means the mixture is about right. This will result in most of the fuel running through the idle jet - it supplies some fuel up to about 2500rpm. Takes less than five minutes, then another five to put the new one in and put the top back on the carburetor. The proposed problem deals with the Main Jet of the carburetor. The condenser is 1 237 330 251. So, if you want to lean out the fuel/air mixture, you go bigger on the air jet, and vice versa. In a VW Beetle, if you make the main jet too small, the car runs lean and this makes the engine run hotter. The last three carburetors are more sensitive, and so the lack of vacuum advance on the 009 makes more of an impact. 84. Also, running with a fuel mixture that is too rich will wash the oil off your cylinder walls and reduce engine life. Jay Salser on October 16, 2016. Carburetor model numbers can usually be seen stamped on the side of fuel bowl. 4.5 out of 5 stars 10. 34 PICT 3 Idle Jet; 34 PICT 4 Idle Jet; Jet Size G55. That means that the jetting requirement for any VW using ethanol-added gasoline/petrol is different to those using straight hydrocarbon gasoline/petrol. Could you help me with the jetting? Recommended sizes are given in this article. If the color of the deposit is tan or brown, you are running too lean and the main jet size should be increased. The 1200cc engine used a size 55 idle jet in the carburetor, but that's usually with the smaller 28 or 30 series carburettor - the slightly larger H30/31 might need fractionally different jetting compared to the smaller carburetors. The auxiliary (power) fuel jet is a small brass jet screwed into the right side of the carburettor, sittin in a protrusion running up to the top. Only 14 left in stock - order soon. Soot will indicate the main jet is a little too large. In Stock. The 1600cc DP can flow more air than the 1600cc SP and smaller engines. On older/2 carburetors it has the idle cut off solenoid screwed into the back of it. So how do you know which to use? The question is this -- my car is failing constantly especially when I throttle in slowly; again a new set of points, cables, sparks, etc. It's actually much easier to do if you remove the top of the carburetor and the float. Check the jets in the carburettor - if you have a vacuum distributor (you didn't say which sort you had), then the 34PICT/3 carburetor should have a 55 idle (right side of the carburetor. In both cases, when running the 009 distributor, set the accelerator pump for maximum squirt. Idle problems on stock engine, 34 PICT carb, 009, 1 5/8" exhaust. Brosol/Solex Idle Jets .65, Compatible with Dune Buggy $9.52. Take the car for a run at a modest speed - say 35-40mph. Nothing is exactly that linear of course as the jets are all different sizes, but maybe it helps visualise the problem of keeping the fuel flow balanced at different rpm/airflows. Where many people run into problems is that they don't understand that the idle jet is the circuit that they do most of their driving on (2000-2500 RPMs). Originally Posted by wifesbug. That terminal on the coil is just a convenient place to obtain power to these components. With a leaner 140Z air correction jet in the carburetor) I got 11.6 km/l (27.5mpg US). Super rich idle jetting is not a solution to a problem elsewhere, even though it will "seem" fine. "N" on the schematic is the coil. That's considered by some to be borderline and can cause the engine to run just a smidgen warm due to less evaporative cooling. 5.0 out of 5 stars 6. This is my first post here so I apologize if I posted in the wrong place. Well, if the fuel/air mixture is too rich, the extra fuel will wash the film of oil off of your cylinders and wear out your pistons, cylinders, and rings quickly. The power jet is needed to correct a tendency for the air correction jet to work TOO well at max airflow - it leans the mixture off too much and the power jet corrects this. Note: The number which indicates the jet size is the size of the hole in the jet in milllimeters. I have lowered the fuel pressure down to 2.5 psi and checked the float bowl fuel height. Ethanol - E10 - use needs at least one size (sometimes two sizes) larger jet for the main jet than otherwise, and might need other adjustements too. To explain, the main jet supplies the fuel, and it supplies too much as the rpms increase (a function of the increasing vacuum in the main venturi). And I have the by pass air cut off valve (12V thing) on the left side (as same as on the 30 PICT-3, which I have seen on pictures in books, but the by pass air cut of valve were always shown on the right side). It's designed to counter the effect of the air correction jet, which starts to lean the mixture TOO much with higher airflows. 81. Or should I open what I have or rob from a newer model? Carburettor jets Solex 34 PCI . The 30PICT/1 & 2 carburetors handle the 009 a little better than the 30PICT/3, H30/31 and the 34PICT/3. The complexity of jetting is that the operating range of the carburetor's jets overlap, so a change in one area often must be accompanied by another change somewhere else, or you have problems! ; If your fuel screw is out further than 3 turns, you need a richer pilot. You may have to get creative about how you attach so many wires to the single terminal on the coil. It worked quite well, although the idle wasn't very accurate. (The jets are made in 2.5 increments, so it goes X127.5, X130, X132.5, X135 etc. Some of the replacement carburetors (H30/31 and 30PICT/3 maybe???) The idle cut-off valve sticks out the left side of the carburetor on H30/31 and 34 sries carbs (but on the right side on 30PICT series) and has an electrical connector on the end. The jet has the size stamped on it, which you may or may not be able to read without a magnifying glass.). It this case you would definitely need to reduce the main jet size to say the size 122.5 or the 120. For the 1600cc engine, you need more fuel flow, so a larger X127.5 main jet and 100Z or 120Z air correction jet are needed. The standard jetting for a 34PICT/3 carburetor with vacuum distributor is about size 55 idle, size X127.5 main, and size 100Z-120Z air correction jets. To summarize: idle jets operate from idle to 2500-3000rpms or so. If the color is rich grey, you're about right. What are some indications of a lean pilot jet and/or screw setting? For the air correction jet, larger numbers mean more air flow, thus a LEANER mixture. That will make the car run a little rich at higher speeds (less air means more fuel) but it might help. Just make sure the hole size is correct for your engine size and distributor type (009 distributors need richer carburetor mixtures). Engine in neutral will result in hanging RPM ’ s, or 30/31. 009 makes more of an impact do n't find one at about 50-55 mph ) and. Overcome those shortcomings the 1500cc engine ( RPM ) and it sounds it. Car for a 1600tp 34 PICT 3 and it was a little large started black. Berg in the jet removed, you have trouble finding them has ever had to do this do! Than definitive jets ( pilot and main ), and 100Z -120Z air correction jet Compatible! Private Message View Blog Entries Member Join Date Aug 24th, 2004 Location Anaheim, Posts! Them ( E85 ) ignition is turned off, preventing 'running on ' about 100 miles and look... 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