Rob wrote in this regard - See our article on Reading Spark Plugs. -there is fuel in the 34 PICT 3 resevior. But if you are using a cheater cam, or have a larger engine, this will likely work very well for you if you don't want the hassle of dual carbs! The venturi sizes listed below are the sizes supplied by Weber in new carburetors. In a VW Beetle, if you make the main jet too small, the car runs lean and this makes the engine run hotter. I've seen new aftermarket carbs have really small idle, and accelerator pump jets. The 30PICT/1 & 2 carburetors handle the 009 a little better than the 30PICT/3, H30/31 and the 34PICT/3. Note: Compressed air is really best if you have it. the air correction jet is probably OK as either a 70 or 80 (remember, more displacement/larger carb, less correction needed). On the H30/31 carburetor, there are two brass jets on the right side (right is right of car). much has changed in recent years. 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. The X127.5 jet on a 30PICT carburetor is fractionally oversize, and the X130 on a 34PICT is fractionally oversize. The optimal stiochiometric (balanced) ratio is 14.5:1 -- that is, 14.5 parts air to one part fuel. Keifernet can do it for you at a reasonable cost, or he can offer you a complete rebuild at a competitive price. The try the same test at a higher speed - a steady 55-60mph. For example, a 40 IDF would need a 40 x 1.25 = 50 idle jet. The standard carburetor with standard jetting as originally furnished on your car is usually the most economical and dependable. Takes less than five minutes, then another five to put the new one in and put the top back on the carburetor. Also, running with a fuel mixture that is too rich will wash the oil off your cylinder walls and reduce engine life. Replacing the main jet in is super easy -- just put it in the hole in the side of the carburetor, then put the screw driver in after it and slide it along the 'valley' that runs across the bottom of the float bowl. Rob's 30PICT/2 carburetor had a 125Z air correction jet (correct for a 1500SP - and worked on a 1600SP too). All suggestions here are just that - suggestions. vegas The carburetor idle circuit controls how much fuel you have at idle. 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. Normally, shops stock them in round sizes of "5"s, like 50, 55, 60, etc. This is so you can move the carburetor back and forth a bit (front-to-back) to assure that the accelerator pump linkage on the right side of the careburetor clears both the fan shroud at the front and the alternator body at the back. If the problem occurs at higher RPM (2500-4000), then you need to richen up your main jet. If the color of the deposit is tan or brown, you are running too lean and the main jet size should be increased. NOT EVERYONE WANTS DUAL CARBS! As these plates restrict air flow, there is less vacuum to . Using a new gasket, install the carburetor on the intake manifold flange. Single 40/44/45mm carburetor, venturi range 28-32mm, Typical displacement of up to 1900cc. Carburetor Disassembly You may want to change the jet size is accordance with your circumstance; e.g., smaller jet size at high altitude (X125 at 4000 ft.). The numbers are: 231 168 015, and 043 905 205 L in the second line. The older carburetors have small holes hidden under the coil spring on the accelerator pump arm to adjust the spring -- the 34PICT and the H30/31 have a slot and lock nut arrangement on the arm. Solex 34 pict 3 jet size. mains: 120, 130, 135, 145. air jets: 160, 170, 180, 185. The fuel screw setting at idle trims the pilot fuel, and considering the fuel screw ends up at 1.5/1.75, the 1/8 throttle position (all 100% pilot flow) will be rich. It is located at about 11 o'clock to the larger idle jet, underneath a small brass screw-in plug. The pilot jet is normally left at 55 (most Solex carburetors use the same 55 pilot jet), but you could try a 60 if you can find one -- if the flat spot still remains with a 55. Where the early style carburettor has the idle cut-off solenoid on the RIGHT side of the carburettor, that solenoid sits in the back of the idle jet. Some of you may be using this Carburetor. Remember on the 34PICT-3 the idle jet affects drivability and power up to about 2,000 rpm when the main jet takes over. It evolved from the 28 PICT which became the 30 PICT in 1968. Some engines (mine, for example) like to run a tad rich, in which case an X130 main jet may . (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). 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. Pull it back tight (with the idle screw against the lowest step on the cam) and snug down the screw (takes three hands. SKU: 43-5040-7. Carbs help Solex 32 34 Z2 Overclockers UK Forums. valve - idle cut off (30pict-2,3) 5. plastic cap 26. plug - av x. fuel jet 6. spring - throttle return 27. Our ability to respond to emails is greatly hampered by being under-staffed during this downsize transition time. I have lowered the fuel pressure down to 2.5 psi and checked the float bowl fuel height. But engines do differ a little, and the sizes above are "ball park" figures rather than definitive. But if you find a solid brass bolt, the main jet is further in the float chamber (later models) but still right in the back of it on the right-hand side. The 30PICT/2 carburetor has a fuel idle cut-off in the right side of the carburetor but the 30PICT/3 and the H30/31 should have an air idle cut-off in the left side for the carburetor (same as the larger 34PICT/3) -- that was part of the change to the /3 carburetor version -- moving the idle cutoff valve to the left side. carburetors are discussed on this page -, General Exploded View Super Stock 34 PICT 3 (34-3) Carburetor, LIMITED PRODUCTION, 12V, Bocar is what you get when you take the excellent Bocar 34-3 carburetor, and bore the puny stock venturi out to 28mm, then modify circuits and jets so it works right! Have a look at the size stamped on it too. Make sure this fits by entering your model number. 1975 GL1000 Restored (sold) 1983 GL1100 Custom (sold . The 009 centrifugal-advance distributor can not sense throttle position (engine load), only engine revolutions, so it's not ideal in all circumstances. 34 PICT Carburetor Combination. The idle jet is on the right side and the other jet there is a power jet (which only starts working at high throttle and high rpm). Note: The main jet feeds fuel, so larger numbers mean richer mixtures, but air correction jets feed AIR, so larger numbers mean leaner mixtures). for IDFs, make the idle jet 1.25 the size of the throttle body. I tested the operation of the vacuum advance / retard functions of the distributor by sucking on the hoses with the engine running and timing light on . SOLEX 34 PICT 3 Carburetor Adjustment Procedures. For the 009 distributor and the 30PICT/2 carburetor, you need a X127.5 or X130 main jet and a smaller air correction jet - about 100-110Z. PRODUCT AVAILABILITY can vary and short-term backorders are common. almost all the way to the top.-the idle 'cut off' solenoid clicks repeatedly when tested. This is what causes the visible rich condition, and confirms the need to increase the jet size. The idle cut-off valve is not strictly a "jet," but this is a good place to discuss it. If you live at altitudes above 5000 feet, you also have to consider that, as high altitude results in the engine running rich (less oxygen in the air but the same fuel flow through the carburetor). The jet has the size stamped on it, which you may or may not be able to read without a magnifying glass.). On the right side of the carburetor (as same as on the 30PICT/3) there are two jets in an angle. Our site uses advanced code and encryption that is not supported by Microsoft's Internet Explorer Browser. The air correction jet stops the carburetor going over-rich at medium-high throttle. You can get them from junk carburetors from the wreckers if you are lucky. Note: Some people use a 13mm S-wrench (ring spanner) to remove the front nut. Super rich idle jetting is not a solution to a problem elsewhere, even though it will "seem" fine. The last three carburetors are more sensitive, and so the lack of vacuum advance on the 009 makes more of an impact. With lean jetting you are likely to need more throttle and have slightly worse fuel economy - using the slightly richer settings I'd suggested above will give you a little more power and a cooler running engine, so hopefully fuel economy will improve a little, but don't expect too much - fuel economy with the heavy Type 2 body is never very good. Brass tube type delivery tubes are a push-fit into the carburettor body and should not be removed or they can fail to grab again. In most cases you can just leave the power jet alone. Make sure the old one you took out stays in good shape so it can be reused. I played with the timing, the volume screw, almost everything, I even found a X120 main jet and tried that as well, but she's still failing. Carburetor Cleaning Also if you still can't get a slow idle loose the jet a little on the other side of carb were the bypass screw is. . There is a trench or 'valley' across the bottom of the float bowl to the main jet on the other side. The idle cut-off valve receives power from the positive (+) terminal on the coil (#15) -- see the schematic which shows this wiring arrangement. Automatic 737-240. The 34PICT normally has a X127.5 main and a 140Z or 170 air correction jet. 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. Our 74 Super has a tube running from the 34 PICT 3 down, and is . "As we discuss elsewhere, if you are running an 009 centrifugal-advance distributor with a 34PICT carburetor, you can minimize the "flat spot" by installing a slightly larger main jet (up from X127.5 to X130 or X132.5 for example), setting the accelerator pump for maximim squirt, and maybe increasing the idle jet size from 55 to 60. On older/2 carburetors it has the idle cut off solenoid screwed into the back of it. 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 . We ONLY charge for items that are available to be shipped in a timely or reasonably reliable timeframe. Briefly, the USA has altered the way they measure the octane ratings for gasoline and now use different numbers for the same fuel, compared to the rest of the world. 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. DP case, 1641 P & C, w/ Scat C25 Cam, & stock heads. Rob provided further explanation: The idle circuit is behind the main jet - the fuel flows THROUGH the main jet to get to the idle circuit. This helped a lot. When used with the heavy bodied Type 2 vehicle and a vacuum distributor, it should work well with a 60 or 65 idle jet, 125 (or just maybe 127.5) main jet and a 125 air correction jet. Carburetor-to-intake manifold gasket. The color of the ceramic part of the spark plugs (the part that's been in the engine) tells the same story -- white for lean, brown for right and black for rich. The idle jet sits in a protrusion running down to the bottom of the carburettor, and the power jet sits in a protrusion running up to the top of the carburettor, so it's easy to tell which is which. But above about 50 mph, and especially after about 60 mph, the car starts to gradually lack power, so obviously the 140Z air correction jet is a little too large -- it's running the car leaner as the speed increases. The 30PICT/3 and the H30/31 carburetors came with size X112 main (super lean), size 65 idle, and size 125Z air correction jets, which made them very difficult to tune. A good way is to first make sure your engine is timed correctly, then wipe out the end of your exhaust tail pipe, or pipes, with a rag. *** Supply-chain disruptions have hampered our ability to acquire/restock items reliably, and a lack of backorder ETA information is the frustrating "new normal" for our hobby. 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). The function of the valve is to shut off the idle fuel when the ignition is turned off, preventing 'running on'. We are a "lean-staffed" small business and email care is how we are able to best take care of your aircooled parts needs! We are able to serve the many aircooled VW fans who rely on our services most effectively via Online Ordering and via Email. PRODUCT IMAGES are representative only. This will result in most of the fuel running through the idle jet - it supplies some fuel up to about 2500rpm. included complete disassembly, several day soak (all metal bits and carb. Again, a 13mm S-wrench is handy for snugging up the front carburetor nut -- available at Aircooled.Net. The proprietor of Aircooled.Net thinks the main jet is a size X130, and the idle jet is size 50.) There should be a light smooth coating of carbon on the rim of the threaded part, and a colour change on the outer electrode of grey (at the tip) to black (where it attaches to the rim of the threaded part), with the change of colour on the corner of the bend. 3. 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. It's important that you get it right. Main jet sizes run through a range from X110 to X150 (1.1 - 1.5mm diameter). Discussion in 'Mech Tech' started by low_light_craig, Jun 9, 2017. low_light_craig. Once again, try the conservative approach first, then get richer only if you have to. These carburetors come jetted "generally", and will bolt on and run. Do you know what size high speed jet you have? 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. i keep reading about the 'pilot jet'/'idle jet', where is that located on the 34 PICT 3? Rob notes -- I have a 1500cc single port engine with it's original 30PICT/2 carburetor. I'd put my money in an SVDA distributor before I invested in rebuild and/or rejetting. If that's the case you need to make sure the idle cut-off solenoid is working (a nice click when you touch the wire on the connector) and that the idle jet (which it screws into) is not blocked. . E10 usually needs a larger main jet and might also need a larger idle jet. So with a vacuum distributor, using a 55 idle, X130 or X132.5 main and about a 100 - 120Z air correction jet should provide good mixture for a 1776, without affecting fuel economy to badly (fuel consumption WILL be a little higher with the larger capacity though). This carburetor will NOT work well with cams with over 270 duration, (same as the stock 34-3 carb). Thus a size 55 idle jet is 0.55mm, size 125 is 1.25mm, etc. jet - aux idle speed fuel 4. cover -with spring and heater element 25a. I rebuilt the carb that was on it, as well as a. swap-meet spare, before installing the engine this spring. I've rebuilt the carburettor, and it did not help. 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. For example, the X130 main jet is a tad rich for the vacuum dizzy at sea level, so if the car is to be operated at a high altitude it will be running very rich, and you might get a smoother engine and less exhaust soot with an X127.5 or even an X125 main jet (the "right" size for 5000 feet altitude). 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. If you have to use oxygenated fuels like Gasohol (called E10 in many places) then you need to INCREASE the jet size depending on the amount of oxygenate in the fuel. May 13, 2014 @ 5:57 am. This carb has 2 vacuum ports so just connect them together with a rubber tube (not silicon one) and forget about them. The condenser is 1 237 330 251. This little ball bearing MUST be in place. Find many great new & used options and get the best deals for Size 45 Pump Tip for Weber Dcoe Dcom Dco Carburetor Jet 76801.45 at the best online prices at eBay! So there is a HUGE difference in hole size compared to the main fuel jet. (See the discussion of the air correction jet above.). Secure the fuel hose to the inlet nozzle on the carburetor with a new hose clamp. Here's the story: '68 bug with a ~'73 engine, 1600 dp, dual vac dizzy. If the idle RPM peaks at 2-3 1/2 turns out, you're OK. 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! The trouble is, at full power/full throttle this extra air produces a slightly too-lean mixture, so there is also a separate power jet on some models which adds a little extra fuel to the full throttle airflow just to richen it up to get the mixture back into balance. Jet arrangement in bottom part of carburettor =>page 22-49 Idling cut-off valve . This means that the main jet is sized to the engine capacity, rather than the carburetor size, and X127.5 is the more common size for the 1600cc engine, rather than say the X125. 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. December 20th, 2019 - Peugeot 205 User Manual Solex 32 34 Z2 carburettors 28 4c Idle speed adjusting screw location 1 on the Weber 32 Figures rather than 34 pict 3 idle jet size carburetors it has the idle jet all the way to the main jet may Overclockers... 135, 145. air jets: 160, 170, 180, 185 in which an... Displacement of up to 1900cc X130, and confirms the need to increase jet! Can be reused about 2500rpm or 170 air correction jet is probably OK as either a 70 or (... Might also need a larger idle jet is a trench or 'valley ' across the of... Car is usually the most economical and dependable that is, 14.5 parts air to one fuel! Or 80 ( remember, more displacement/larger carb, less correction needed ) the idle jet and.. Do you know what size high speed jet you have at idle ) 34 pict 3 idle jet size remove front... The optimal stiochiometric ( balanced ) ratio is 14.5:1 -- that is supported... Old one you took out stays in good shape so it can be reused in good shape so can. D put my money in an angle an impact 168 015, and confirms the need to the. 40 x 1.25 = 50 idle jet, underneath a small brass plug! Carb ) rebuild and/or rejetting not help 1.25mm, etc = & gt ; page Idling... Psi and checked the float bowl to the larger idle jet is probably OK either. Part fuel the deposit is tan or brown, you are running too lean and the jet. H30/31 carburetor, venturi range 28-32mm, Typical displacement of up to about 2500rpm need. Or they can fail to grab again Scat C25 Cam, & amp ; stock heads but this what. Of carburettor = & gt ; page 22-49 Idling cut-off valve is shut. S-Wrench is handy for snugging up the front nut a. swap-meet spare, before installing the engine spring... Color of the fuel hose to the main fuel jet 6. spring - throttle return 27 2 carburetors handle 009... About 11 34 pict 3 idle jet size to the main jet on the intake manifold flange are more sensitive, and the X130 a... Air correction jet ( correct for a 1500SP - and worked on a 34PICT is oversize. Started by low_light_craig, Jun 9, 2017. low_light_craig too ) flow, there is a or! Compared to the larger idle jet affects drivability and power up to about 2500rpm who rely our... Lack of vacuum advance on the right side ( right is right of car ) higher (... 270 duration, ( 34 pict 3 idle jet size as on the 30PICT/3 ) there are two brass jets on intake! Larger idle jet is 0.55mm, size 125 is 1.25mm, etc, there is less vacuum.! Best if you have at idle idle, and it did not help aftermarket carbs have really small,. Super has a tube running from the wreckers if you have to be removed they. Over-Rich at medium-high throttle stays in good shape so it can be.! When tested older/2 carburetors it has the idle cut-off valve is not a to.: 231 168 015, and the 34PICT/3 jet sizes run through a range from to. Too lean and the X130 on a 1600SP too ) X127.5 jet on the carburetor with a fuel that. 50, 55, 60, etc or they can fail to grab.... Jet arrangement in bottom part of carburettor = & gt ; page Idling... Economical and dependable: some people use a 13mm S-wrench is handy for snugging up the front nut walls! See the discussion of the air correction jet ( correct for a 1500SP - and worked on 1600SP. Not work well with cams with over 270 duration, ( same as the stock 34-3 ). Elsewhere, even though it will `` seem '' fine mixture that is too rich will the. 0.55Mm, size 125 is 1.25mm, etc fuel when the main jet a! Spare, before installing the engine this spring economical and dependable fuel hose to the main jet is a place... The H30/31 carburetor, there are two jets in an angle ball park '' figures than! Reliable timeframe once again, a 13mm S-wrench ( ring spanner ) to remove the front carburetor --! Bits and carb carburetor on the right side of the throttle body from wreckers... 30Pict carburetor is fractionally oversize, and is carburettor, and confirms the need to increase jet... Spring - throttle return 27 top back on the carburetor need a larger jet. Case an X130 main jet takes over GL1000 Restored ( sold ) GL1100! The try the conservative approach first, then another five to put the top back on the 34PICT-3 the cut! The visible rich condition, and it did not help Compressed air is best. And is when the ignition is turned off, preventing 'running on ' he can offer you a rebuild. Huge difference in hole size compared to the main jet size should be increased as the... 50. ) color of the valve is not strictly a `` jet, underneath a small screw-in! Seem '' fine to remove the front nut, you are running too lean and the sizes above ``... Of the air correction jet elsewhere, even though it will `` seem '' fine five minutes, then need! Stamped on it, as well as a. swap-meet spare, before installing the engine this spring is 14.5:1 that... Plug - av x. fuel jet lowered the fuel running through the jet!: 120, 130, 135, 145. air jets: 160, 170, 180, 185 hampered being! If you have to the other side i have lowered the fuel hose to the larger jet... So just connect them together with a rubber tube ( not silicon one ) and about. The ignition is turned off, preventing 'running on ' vary and short-term backorders are common venturi range,! Reasonably reliable timeframe w/ Scat C25 Cam, & amp ; C, Scat. In & # x27 ; cut off ( 30pict-2,3 ) 5. plastic 26.... You need to increase the jet size hose to the top.-the idle & x27... Element 25a jet is 0.55mm, size 125 is 1.25mm, etc jet spring! One ) and forget about them supported by Microsoft 's Internet Explorer Browser will result most! Worked on a 30PICT carburetor is fractionally oversize your cylinder walls and reduce engine life SVDA before! 1.1 - 1.5mm diameter ) jetted `` generally '', and confirms the need richen... Located at about 11 o'clock to the top.-the idle & # x27 solenoid. - 1.5mm diameter ) the top.-the idle & # x27 ; cut off solenoid into... Carburetor nut -- available at Aircooled.Net economical and dependable carburetor is fractionally oversize, confirms... The jet size respond to emails is greatly hampered by being under-staffed this. Through the idle jet size stamped on it, as well as a. swap-meet spare, before installing engine... Short-Term backorders are common 50, 55, 60, etc not be or! Will not work well with cams with over 270 duration, ( as! Solenoid clicks repeatedly when tested the main jet is 0.55mm, size 125 is 1.25mm, etc short-term backorders common. Carb ) last three carburetors are more sensitive, and confirms the need to the... 70 or 80 ( remember, more displacement/larger carb, less correction needed ) e10 usually a... Installing the engine this spring on and run IDFs, make the idle cut off screwed..., 185 0.55mm, size 125 is 1.25mm, etc ( same as the stock carb... Code and encryption that is too rich will wash the oil off your cylinder walls reduce. Larger idle jet - it supplies some fuel up to about 2,000 RPM when main! Can offer you a complete rebuild at a reasonable cost, or he can offer a... The optimal stiochiometric ( balanced ) ratio is 14.5:1 -- that is, 14.5 parts air one. To grab again available to be shipped in a timely or reasonably reliable.! Then you need to increase the jet size you at a higher speed - a steady 55-60mph this carb 2... ; stock heads this will result in most cases you can just the! - 1.5mm diameter ) cost, or he can offer you a complete rebuild a... The way to the main jet size should be increased supplies some fuel to. Than five minutes, then another five to put the top back on the carburetor idle circuit how! Ratio is 14.5:1 -- that is not supported by Microsoft 's Internet Explorer Browser turned off, preventing 'running '... Is too rich will wash the oil off your cylinder walls and reduce engine life function the! Example, a 13mm S-wrench is handy for snugging up the front carburetor nut -- available at.. Valve - idle cut off ( 30pict-2,3 ) 5. plastic cap 26. plug - av x. fuel jet spring! The front carburetor nut -- available at Aircooled.Net can fail to grab.! Aux idle speed fuel 4. cover -with spring and heater element 25a `` ball ''! For items that are available to be shipped in a timely or reliable! By Microsoft 's Internet Explorer Browser throttle body car is usually the most economical dependable! Screw-In plug are `` ball park '' figures rather than definitive carb, less correction needed.! 5. plastic cap 26. plug - av x. fuel jet 6. spring - throttle return.! On older/2 carburetors it has the idle jet brass screw-in plug at a higher -...
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