The fact that they receive power from a terminal on the coil has nothing to do with the coil itself. Note: It is very important that you install the correct needle seat gasket. Rob came back with a detailed response - The H30/31 is almost identical to the 30PICT/3 - it's a modern equivalent of the same carburetor, but has a fractionally larger throat for a higher airflow. Any auto supply store can sell you a little T-shaped adaptor that will fit on the terminal, with three "wings" (if you will) to which the three black wires can be attached. Note: A cheaper alternative to buying a new carburetor is to have the carburetor rebushed. And the second issue is the presence of Ethanol (alcohol) in gasolines. Following are the jet and other specifications for the 34PICT/3 carburetor -, Accelerator Pump Feed: 1.3 - 1.6cc/stroke, Fuel Pump Delivery Pressure (max): 3 - 5 psi, Delivery Capacity (min): 400cc/min @ 4000 rpm, The jets in Dave's 34 PICT/3 carburetor are -. If you're still looking lean, go to a 132.5. Do you know what size high speed jet you have? This will richen the mixture and help eliminate any 009 flat spots. None of these tests are definitive - just indicative. Please trust that even when we can't reply to your email promptly, we are continuing to work to fulfill your Order Request as best we can, and we will contact you at any point where we have any new information that is not already posted in your online Order Progress/History area in your customer account. The timing is set ATDC. almost all the way to the top.-the idle 'cut off' solenoid clicks repeatedly when tested. Reply to Phatman. Torque the retaining nuts on the bolts protruding through the intake manifold flange to 14 ft-lb (just a snug-and-a-tug them up tight with your 13mm box-end wrench/ring spanner). . We ONLY charge for items that are available to be shipped in a timely or reasonably reliable timeframe. It's interesting to note that everything we've seen on the air correction jet talks about the effect becoming noticeable at about 4000+ RPM, but that's not the case. The 137.5Z air correction jet is too big -- it's letting in too much air. I also adjust my accelerator pump after getting it to idle good. Others are upset by a backfiring, or smoke belching monster. 3. Again, a 13mm S-wrench is handy for snugging up the front carburetor nut -- available at, Pass the end of the accelerator cable through the cable pivot pin installed in the throttle lever. 55 idle is fine. The air correction jet has to be the right size for the same reason. There is also a 65 power jet there too) a X127.5 main jet (bottom of the float bowl -- access via the brass plug in the left side), and a 60Z or 80Z air correction jet -- a vertical brass "screw" with a hole in the middle, between the float bowl and the main throat. It only works at full throttle and high RPMs ? This will have the main jet supplying the fuel, and read the plug again. Sounds like a good starting point! I've never had to do this so don't even know if it would work well. So if we say that three x's is normal full flow for that jet (stoich), then at 4000 rpm, the main jet is working more than it should so the air correction is working to pull the mixture back to normal. Checking and adjusting cold idle speed =>page 22-53 Throttle valve positioner 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. If the idle RPM peaks at 2-3 1/2 turns out, you're OK. (Solex jets are marked with the hole size in mm, so a X127.5 jet has a 1.275mm hole - I'm not sure what numbering method Mikuni use). We have sold thousands of Bocar carburetors, so when we decided to offer an upgraded carb, we chose to use the Bocar 34-3. Top Quality CNC-Machined KIPA Carburetor Replace for VW 34 PICT-3 12V Electric Choke 1600cc Dual Port Engine,Improve throttle response for better engine performance, Pefect Idle and Top Accelerator Status, help to keep your Car running at Top performance. The H30/31 is the largest carburetor you can use with the normal single-port manifold. In some parts of the world, a 31PICT was used on 1300cc twin port engines from 1971 onwards (but not seen in the USA). The fiddly bit is pulling the jet back through the hole. Then if you need a fatter idle go up to 57.5, then 60. Idle jet sizes of 70 or so will "run" on anything, but they don't run WELL (unless fouled plugs or 12mpg are your idea of "well"). Most 34PICT/3 carburetors don't need this though -- usually the larger main, and then maybe blocking the air bleed hole in the throttle plate, plus maximizing the squirt from the accelerator pump is enough. Aircooled.Net, Inc. is in no way affiliated or associated with Volkswagen AG or Volkswagen ("VW") of America. E10 usually needs a larger main jet and might also need a larger idle jet. 2mm doesn't sound like much, but it makes a pretty big difference in how the carb performs, especially for busses which are often winding out on the RPMs! Except for the fact that it won't idle! If not, I find that "canned air" (like Ultra Jet or similar) works pretty well. Jet-A-Vator. 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. See our. On the right side of the carburetor (as same as on the 30PICT/3) there are two jets in an angle. When you work out the area of the hole in each jet, the steps are roughly 2% increase in fuel flow for each size up (X125 to X127.5 for example). Useful experiment anyway. ; Replace Part Number: 98-1289-B, 113129031K.Dual Port Manifold only, Not for single port. 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. 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). 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. Hey, use the stock jet size, which is 125 for the 34 PICT-3. The biggest problem I have with it was the fuel consumption. The VW engine actually runs better at fractionally rich settings (ideally 13.8:1 rather than 14.5:1 according to Bob Hoover). by vwlover77 Fri May 05, 2017 6:58 pm. i keep reading about the 'pilot jet'/'idle jet', where is that located on the 34 PICT 3? Also check that the valve hasn't worked loose in the carburetor -- they do sometimes, and then work only intermittently. While it is necessary to enrichen the fuel mixture when running an 009 distributor, you don't want the any richer than necessary since it will use more fuel. Located in: Braunschweig, Germany. People often will shell out the bucks for a new carburetor, bolt it on right out of the box, and seem "pleased" with the results. As the airflow through an "open venturi" (Solex type) carburetor rises, increasing vacuum starts to draw too much fuel through the main jet, so it starts to run rich at high air flows. nomenclature and part number (referring to the exploded view). I find it much easier to just use a regular 13mm box-end wrench (ring sopanner), as getting the S-wrench on and off of the nut is very difficult (walls on the box (ring) end are too thick). Change the main first and do a plug read as above. Rob replaced the air correction jet with a 140Z, and at low-middle speeds there is no discernible effect. In adjusting the carb, I've currently got the bypass screw out 3 turns, and the volume control screw out 4 full turns (sounds . AU $0.86 (approx 0.48)Australia Post International Standard. I have recently rebuilt a 34-PICT 3 for my bus with a S.B. Microsoft has retired Internet Explorer in favor of their new browser- Microsoft Edge, or you can use Google Chrome or Mozilla Firefox. This little ball bearing MUST be in place. More throttle does make it go away. So where an old VW required a 91 RON octane fuel, that is now equivalent to an 87 AKI fuel in the USA. 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). Then tighten further according to the chart. Float pin retainer (7) 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 doesn't open you won't idle! (See our Automatic Choke Discussion and Adjustment Procedure.). The Solex main jet is also identical to the main jet used on some Mikuni motorbike carburettors so you might be able to get jets from larger motorbike shops too (Kawasaki, Suzuki, Yamaha), but the hole would probably need redrilling to suit the required fuel flow. The proprietor of Aircooled.Net thinks the main jet is a size X130, and the idle jet is size 50.) PRODUCT AVAILABILITY can vary and short-term backorders are common. 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. CAUTION: Always wear safety classes when using cleaning solvents or compressed air. Main jets are primarily from 2500-4500rpms, and Air jets affect the engine from 3500/4000 on up. Currently our response time to emails is slow (we are severely short-staffed). The X127.5 jet on a 30PICT carburetor is fractionally oversize, and the X130 on a 34PICT is fractionally oversize. This gasket sets the fuel height in the float bowl; erratic behavior may result if the gasket is not correct. weber weber carburetors 34 ict 15290 racetep com Aug 22 2022 web 1 1 carburetor cover 31706 055 31 1 bush for fast idle control lever 12750 058 2 1 . Main jet size 127#, Pilot Jet size 55 # MPN: Replace For OEM part Numbers 113129031K . If there are any blockages or crud it would be worth giving the carburetor a complete cleaning. These carburetors come jetted "generally", and will bolt on and run. At a pinch you can use WD40 or similar, using the little straw to get into small holes etc, but these products do dry to a sticky residue, so are not ideal. You have to take the top off the carburetor to see it (careful taking this one out -- it's about an inch long and has the emulsion tube attached underneath). Assuming a vacuum distributor, the 34PICT/3 carburetor is usually jetted with a X127.5 main jet, and 100Z -120Z air correction jet. It is located at about 11 o'clock to the larger idle jet, underneath a small brass screw-in plug. Later versions of the Solex carburettor have the same body and thread as the idle jet close by, so don't confuse the two and interchange them or you will have a rich idle and lean top end. If it's working, you'll hear a clicking sound as the relay pulls in. PRODUCT INFORMATION: All information provided by Aircooled.Net (via website or email) is for USE AT YOUR OWN RISK. In most cases you can just leave the power jet alone. If the jets are screw in to tight that will cause high idle. and jet > size. It worked quite well, although the idle wasn't very accurate. 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