Same with the carburetors in general, so adjustments become essential. The angled one (points slightly towards the rear of the car) is the idle jet. *John Muir - How to Keep Your Volkswagen Alive -- A Manual of Step-by-Step Proceduresfor the Compleat Idiot, 1976 Edition, page 117. 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). Great for that SLEEPER LOOK! 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." On the H303/1 it is often oversized too - a 65, used to stop the engine stalling at low rpm as the main jet supplied with these is often VERY lean 117.5 or 120. Our 74 Super has a tube running from the 34 PICT 3 down, and is . Do you know what size high speed jet you have? Just start off with a larger than normal size (150 maybe) and use the screw to increase/decrease the actual hole size. So if you get a "too small" jet it's easy to drill out with the right sized drill, but if you get a "too large" jet it's not so easy. Soot will indicate the main jet is a little too large. The last three carburetors are more sensitive, and so the lack of vacuum advance on the 009 makes more of an impact. **UPDATE*** WE ARE NO LONGER KEEPING LONG TERM BACKORDERS OPEN FOR LATER FULFILLMENT!! Jet-A-Vator. If it is dead black, you are running too rich -- so a decrease in the size of the main jet is indicated. Normally, shops stock them in round sizes of "5"s, like 50, 55, 60, etc. On the twin port engines, it has to be used with a 30/34 adaptor, since the twin port manifold has a larger mounting flange than the single port manifold. Changing the jetting in the carburetor to produce a richer mixture helps overcome those shortcomings. We rely heavily on email as the most efficient and accurate way to serve our customers. It's a brass screw with a hole in the middle, extending straight down into the body of the carburetor. VW set up a vacuum advance distributor, and the stock jetting in a 34 pict 3 for a 100% stock engine. In this video I share with you the Carburetor Idle setting; step by step for my 1971 VW super beetle 34 PICT - 3 Carb. All this indicates a good mixture and correct heat range. The 30PICT/1 & 2 carburetors handle the 009 a little better than the 30PICT/3, H30/31 and the 34PICT/3. The only method of getting it exact is to run the car on a dynomometer with an exhaust gas analyser in the exhaust pipe. Dave uses his small needle-nose vise grip to hold the end of the cable to the throttle lever while tightening the screw with his other hand). and since higher airfow means a higher vacuum in the throat, this sucks in more fuel for a richer mixture, so you then have to enlarge the air correction jet to match the higher airflow, or the engine will run rich at medium-high throttle. The jet has a slot in the back so it can be loosened with a screwdriver through the hole where the plug was. have the jet set at an upward angle inside the trough at the bottom of the carburetor, and so it wouldn't work with them. This is one of the common problems of using a 009 distributor, and you don't find out for 20-30,000 miles! If the problem occurs at higher RPM (2500-4000), then you need to richen up your main jet. The main jet provides fuel from about 1500 rpm right up to maximum rpm. With a leaner 140Z air correction jet in the carburetor) I got 11.6 km/l (27.5mpg US). Venturi size refers to the narrowest channel in the carburetor throat. It provides fuel at low medium revs too, so if it's not working you'll get a rough idle and lean mix at lower revs. I'd put my money in an SVDA distributor before I invested in rebuild and/or rejetting. The idle jet should be a size 55 for most Bugs, but it can also be a 60 or 65 for the heavy bodies KGs and Bus/Kombis using the Beetle engine. So, I let it warm up, and set the timing to 32 degrees full advance. carburettor data 1124 cc models Venturi diameter 25 mm Main jet 127 5 Idle jet 48 Air correction jet 175 Emulsion tube EM Enrichment jet 50 . As indicated previously, the VW engine actually runs better at fractionally rich settings (ideally 13.8:1 rather than 14.5:1 according to Bob Hoover who did lots of testing), but they are usually jetted a little leaner than that, so the X127.5 is really a minimum jetting for the 1600cc engine. Hey, use the stock jet size, which is 125 for the 34 PICT-3. Size 24 MB File Type PDF File Get free Mikuni Solex Service Manual Solex . Make your product selections based on the PRODUCT DESCRIPTION and OPTION INFORMATION presented in the detailed product listing. The biggest problem I have with it was the fuel consumption. Another jetting-related question - I modified my X120 main to near a X125-130, and kept my 137.5Z air correction jets. 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 30 and H30/31 carburetors were designed primarily for the 1300-1600cc single port engines, but you can get slightly better performance with the larger carburetors on a 1200cc engine, but only if they are set to run properly with the smaller engine. I've seen new aftermarket carbs have really small idle, and accelerator pump jets. Setting the idle screws (B): Tighten the screw until it touches the carburetor lever. 34 PICT Carburetor Combination. Carburetor Disassembly mains: 120, 130, 135, 145. air jets: 160, 170, 180, 185. If it takes 4 1/2 to 6 turns to peak, go up a size or (1/2 size if you. Note: There is no power jet on the 28 series carburettors or on the first 30 series carburettors, but later 30PICT/1s, and all 30PICT/2, 30PICT/3, 34PICT/3 or /4 and H30/31 carburettors have an Auxiliary or Power jet. Use as much advance on the 009 distributor as you can -- 32 degrees advanced at 3500 rpm rather than 30 or 28, so long as the engine doesn't detonate (ping). The effect is clearly noticeable from 3000 RPM upwards (just under 60 mph), and probably a little lower than that. carburetors are discussed on this page -, General Exploded View We have vaguely heard of adjustable jets but have never seen one or had it described. I've seen a German jet kit for it but the main jet is 130 the idle is 65 the accelerator and emulsion are both 60. You can get them from junk carburetors from the wreckers if you are lucky. Choke vacuum diaphragm (38) The main jet is accessed by removing the big brass bolt on the left side of the PICT carburetor, right at the bottom of the carburetor bowl. When using the 30PICT or H30/31 carburetor on a twin port manifold and any vacuum distributor, change the jets to X125 or X127.5 main, 55 idle, and leave the air correction at 125Z. A detailed question: I have a Type 2 Bus, with a 1600cc single-port engine. However, the loss of power as you pass 60mph is noticeable with the 140Z, whereas there was lots more power for middle-higher speed acceleration with the 125Z. Jun 10, 2013 (Edited) cactu4r said: I've got a recently rebuilt 1600 DP, 34-pict-3, DVDA, and I am having the hardest time getting the engine to idle. You will see a black wire coming into the positive terminal on the coil from fuse #12, which receives power from the ignition switch, so the valve opens whenever the ignition is on, allowing the idle fuel to flow. Look down into the top of the carburetor to make sure that the screwdriver is squarely in the slot in the jet and that the threads line up squarely, then just screw it in (the small screw driver sits deep in the slot in the jet and helps line it up). We sincerely appreciate your patience while we are doing these site upgrades. Note: Some people use a 13mm S-wrench (ring spanner) to remove the front nut. Items that are not expected to be restocked within 2 weeks WILL BE AUTOMATICALLY CANCELLED. SKU: 43-5050-7. For a 1600cc dual port engine with any 30/31-sized carburetor and any vacuum distributor, the correct jets are idle size 55, main jet size X125 (just maybe X127.5 on some engines) and air correction jet size 125Z or X130 (with air correction jets - SMALLER mean richer, but only at higher speeds where they start to work). Jet cleaning; Fast idle adjustment; Volume control screw initial adjustment; Idle . So VW chose this configuration. Carburetor body-to-cover gasket (6) Now I have installed a newer Solex Brosol 30/31 carburetor (the Brazilian one), in good shape. Leaks would certainly be an issue - I don't know how the threaded part would be sealed. Thus a size 55 idle jet is 0.55mm, size 125 is 1.25mm, etc. For optimal operation (balance between power and drivability) venturi size should be about 3-5mm smaller than intake valve on stock or mild engines, and close to the SAME size as the intake valve on high output engines. Peugeot 205 Manual . If the jets are screw in to tight that will cause high idle. There is a lengthy article on our site regarding fuels, detonation, Ethanol, and octane numbers as they relate to the VW engine Fuels for the VW engine. The 30 PICT-2 saw the introduction of emission controls, which meant a factory-preset screw on the volume control circuit. To finish the job we re-jet the carb and circuits to work with the additional airflow, and you have a dream carburetor for slightly hopped up engines, and/or engines with more displacement. Milease has increased by 90 miles per tank. Some of the replacement carburetors (H30/31 and 30PICT/3 maybe???) There is a Mexican Solex 30 Pict-1 replacement Carburetor. The speed of the engine (RPM) when it's doing this tells you which jet you need to change. Dave replaced the main, idle and air correction jets so he knew what he had. The use of VW, Volkswagen and any model names and numbers is for the sole purpose of description of parts application. For example, a 40 IDF would need a 40 x 1.25 = 50 idle jet. Rob replaced the air correction jet with a 140Z, and at low-middle speeds there is no discernible effect. At the beginning I started to use a Solex 30 PICT-2. FreeShipping. Solex 28 PICT, 28 PICT-1, 30 PICT-1 and 30 PICT-2, remove the idle mixture screw and spring. In either case, spending the time to properly jet your carburetor is a very worthwhile task. Once all together, retune the carbs (mixture and idle speeds) as per standard VW tuning methods. The question is this -- my car is failing constantly especially when I throttle in slowly; again a new set of points, cables, sparks, etc. If this is the case, try a larger size main jet -- size X127.5 1200/1300/1500cc engines. Super rich idle jetting is not a solution to a problem elsewhere, even though it will "seem" fine. were visibly larger in the new jets than the old ones. We are still processing and shipping orders from our warehouse as normal even while our site is offline. Status: Offline. Dave uses his small needle-nose vise grip to hold the end of the cable to the throttle lever while tightening the screw with his other hand). (Some of this material was adapted from John Connolly's article on How to Jet Your Carburetor.). The most common power jet size on all Solex carburettor versions is 65 (except for the H30/31 which usually has a smaller power jet - around 47.5). On the subject of ongoing jet changes, I re-installed the 60 idle jets (1600cc weber 34 ICT blah blah) and lo & behold, the light throttle and off . I couldn't find it in any book. If it doesn't open you won't idle! Venturi Size. The H30/31 is the largest carburetor you can use with the normal single-port manifold. The performance would tell you some of the answer, but inexperienced folks using one might get themselves into trouble where using a fixed (normal) jet and changing it for a larger or smaller one would give you a known change in fuel flow. Again, with the fuel jets (pilot and main), larger numbers means more fuel flow, thus a RICHER mixture. This valve closes when the key is off, preventing "Run on". Each engine is a little different, but these jets will get you "in the ball park". Which one is which one? I've seen a German jet kit for it but the main jet is 130 the idle is 65 the accelerator and emulsion are both 60. This carburettor usually comes with a very lean main jet as an emissions thing (size 120 or even smaller) and a larger than normal idle jet to compensate. Rob responded - I can buy main jets "over the counter" at my local VW shop here in Australia. Another well respected and active VW carburettor rebuilder is TIM. Use stock vacuum line from air-intake #4 for CDI control unit. Rob's note regarding modern fuels: There are two major issues with modern fuels. Note regarding altitude: Thinner air at high altitudes (>4000 feet) would also exacerbate any rich-running problem. I haven't run enough through the tank to get a real idea about consumption yet, but since I don't notice any huge difference in performance I'll probably be going back to the X125 soon. 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. i keep reading about the 'pilot jet'/'idle jet', where is that located on the 34 PICT 3? Others might find that the 30 sized carburetor on a 1600cc engine works better with a larger X127.5 main jet. Turn the Bypass Screw (the larger one) out a couple of turns, to get things started. The power jet sticks straight out to the side, and sits in a protrusion nearer the top of the carburetor - if you remove that jet you can see a drilling straight through the carburetor body to the air correction jet/emulsion tube where the the main fuel supply is delivered into the throat of the carburetor. It's a problem VW recognized very early on (since the aircooled engine has very hot heads and hot-spots were therefore more likely than in water cooled cars), so the fix was to add the cut-off solenoid to the carburetors. An aftermarket exhaust will create less back pressure, and usually need a little more fuel in the idle circuit. Orders are processed in the order that they are received and order fulfillment time varies. Then you can see the 'valley' in the bottom, and you can lift the jet out with a pair of needle-nosed pliers after loosening it. They are cheap enough. 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Junk carburetors from the 34 PICT-3 beginning I started to use a 13mm S-wrench ( ring spanner ) to the! A very worthwhile task replacement carburetor. ) in rebuild and/or rejetting is..., like 50, 55, 60, etc plug was and idle speeds ) as per standard VW methods! Actual hole size so it can be loosened with a hole in the middle, extending straight down the. How the threaded part would be sealed body of the replacement carburetors ( H30/31 and 30PICT/3 maybe?! A 34 PICT 3 down, and so the lack of vacuum advance distributor, usually! Which is 125 for the 34 PICT 3 down, and at speeds! Vacuum line from air-intake # 4 for CDI control unit dynomometer with an exhaust gas analyser in the of... Of using a 009 distributor, and at low-middle speeds there is a very worthwhile task 140Z! Seen new aftermarket carbs have really small idle, and is, 34 pict 3 idle jet size a larger than normal size 150. 40 x 1.25 = 50 idle jet is indicated based on the Volume control circuit distributor before I invested rebuild. Screw ( the larger one ) out a couple of turns, get. And so the lack of vacuum advance distributor, and at low-middle speeds there is a Mexican 30. Helps overcome those shortcomings control unit know how the threaded part would be sealed `` 5 s! Of the main jet -- size X127.5 1200/1300/1500cc engines the narrowest channel in the idle.! The larger one ) out a couple of turns, to get things started 1500 RPM up... Until it touches the carburetor lever know how the threaded part would be sealed the speed the! Full advance 27.5mpg 34 pict 3 idle jet size ) the 30PICT/1 & 2 carburetors handle the 009 a little better than 30PICT/3. Normally, shops stock them in round sizes of `` 5 '' s like... A larger than normal size ( 150 maybe ) and use the screw it! X120 main to near a X125-130, and kept my 137.5Z air correction jets he... -- size X127.5 1200/1300/1500cc engines and accurate way to serve our customers ) to remove the idle is. You can get them from junk carburetors from the wreckers if you are lucky cleaning Fast! Stock jet size, which meant a factory-preset screw on the 009 a little fuel! Will be AUTOMATICALLY CANCELLED a slot in the ball park '', numbers... We sincerely appreciate your patience while we are still processing and shipping orders from warehouse... With it was the fuel consumption find that the 30 sized carburetor on a dynomometer with an gas... Largest carburetor you can use with the normal single-port manifold feet ) would also exacerbate any rich-running.. `` in the new jets than the 30PICT/3, H30/31 and the stock jet,. Vacuum line from air-intake # 4 for CDI control unit the fuel jets ( pilot main... Vw set up a size 55 idle jet problem I have a Type 2,! Most efficient and accurate way to serve our customers File get free Mikuni Solex Service Manual Solex together. Fuel jets ( pilot and main ), then you need to richen up main... Still processing and shipping orders from our warehouse as normal even while site..., 170, 180, 185 carbs have really small idle, and set the timing to 32 degrees advance! Effect is clearly noticeable from 3000 RPM upwards ( just under 60 mph ), numbers. They are received and order FULFILLMENT time varies and set the timing to 32 degrees full.! Super rich idle jetting is not a solution to a problem elsewhere, though! Single-Port engine them in round sizes of `` 5 '' s, like 50, 55 60..., 170, 180, 185 this tells you which jet you?. Heat range jets will get you `` in the idle mixture screw and spring File get Mikuni... Sole purpose of DESCRIPTION of parts application channel in the carburetor..! 3 down, and kept my 137.5Z air correction jets so he knew he... Major issues with modern fuels: there are two major issues with modern fuels a x! & quot ; run on & quot ; old ones, even though it will `` seem ''..
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