It sounds like the jets you have in there are set for a lean running Bug (50 idle, 125 main and 135 air correction makes for slightly lean through the rpm range with the light bug body). 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. With the idle cut-off valve working correctly, hot spots in the cylinders don't occur as readily, since there is no fuel available to keep the engine running once you turn off the ignition. Contrast the Main Jet of the VW 105-1 for the '67 Beetle which would be120. If the problem occurs at higher RPM (2500-4000), then you need to richen up your main jet. Single 40/44/45mm carburetor, venturi range 28-32mm, Typical displacement of up to 1900cc. to the back of the engine, in an angle) is a: g f 50 and the other: g f 50. (The jets are made in 2.5 increments, so it goes X127.5, X130, X132.5, X135 etc. PLEASE NOTE: You are NOT CHARGED for out-of-stock items. Sounds like a good starting point! This is one of the common problems of using a 009 distributor, and you don't find out for 20-30,000 miles! No blue fumes, so the piston rings are well installed. In other words, it's extremely crucial for in-town driving. The 30PICT/2 was used on the 1500cc engine (1967 to 1969 or 1970 depending on the country). It is still UNCERTAIN, but we may re-open a substantially downsized version of our store again in the Spring of 2023. Home . The jets in Dave's 34 PICT/3 carburetor are - Main jet - X130; Idle jet - 55; Air correction jet - 80Z ~~~ Jetting With the Centrifugal-Advance 009 Distributor, The 009 centrifugal-advance distributor can not sense throttle position engine load, only engine revolutions, so it's not ideal in all circumstances, Changing the jetting in . Size 24 MB File Type PDF File Get free Mikuni Solex Service Manual Solex . Then remove a spark plug and read it (see our Spark Plug Reading Guide). Main jet plug seal (15)
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! Remove the top of the carburetor (five screws, the choke wire and the throttle spring) and you can see it between the float bowl and the main throat. The idle jet is a brass "bolt" screwed into the right side of the carburetor. 3. Re: 34 PICT 3 Adjustment Woes. You can get them from junk carburetors from the wreckers if you are lucky. Always sort the main jet out before playing with the air correction jet, which "corrects" the mixture from the main jet at higher speeds. . Our dual carburetor Jet Boxes (737 series) are supplied with: 4 sizes of main jets with 4 each, 4 sizes air jets with 4 each. 34 pict 3 carburetor overhaul Jan 27 2023 web the proper float valve washer 4 must be used for the specific type of carburetor the 34 pict 3 carburetor uses the 0 5 mm 020 gasket a micrometer . We are now only fulfilling order requests only for items that we have in stock OR that we know can be acquired within a defined timeframe. Turn the ignition on (but do not start the engine). If you don't have a compressor, talk to Santa Claus! and jet > size. Take the car for a run at a modest speed - say 35-40mph. 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 speed of the engine (RPM) when it's doing this tells you which jet you need to change. I can't remember off-hand which is which, but the power jet is in a vertical protrusion on the side of the carburetor which leads up to the outlet for the power jet in the top of the carburetorthe other one is the idle jet. Special Instructions
I would think you would need a .55mm-.60mm idle jet, and a .60 pump jet. This distributor need MORE fuel (bigger jets) to work properly -- otherwise you will get a lot of hesitation (coughing/sputtering) when you accelerate (push the throttle). A sooty plug means the idle jet might be a little large. If the engine is stumbling at 2000 RPMs and lower, then you need to richen up your idle jet (go to a larger size) - but check carefully for air leaks around the throttle shaft first!. PRODUCT AVAILABILITY can vary and short-term backorders are common. 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 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. The usual change people make from standard VW carburetion is an increase in the main jet size, which may help the engine run a little cooler. Solex 34 pict 3 jet size. The EMPI Brosol and Solex Replacement Main Jets are sold individually in sizes ranging from 112.5 to 170. The old one for a pattern and a sharp hobby knife or box cutter works well. jet - aux idle speed fuel 4. cover -with spring and heater element 25a. CAUTION:
And we will continue responding to emails through until early March 2023 because we are wholly committed to resolving any other issues that may arise from previous sales. The 34PICT/3 carburetor is usually used on 1600cc or larger engines. The tiny drills are available from specialty tool shops, some large hardware shops and a few VW shops. PRODUCT INFORMATION: All information provided by Aircooled.Net (via website or email) is for USE AT YOUR OWN RISK. 2. Note: Regarding "drilling out" the main jet, please see our article on Tuning the 009 Distributor/
> Servicing Keihin carburettor>07.78 . This reduces the fuel flow back towards stoichiometry -- that is, it prevents the carburetor going over-rich at higher speeds/airflow. Main jet size 127#, Pilot Jet size 55 # MPN: Replace For OEM part Numbers 113129031K . Also check that the valve hasn't worked loose in the carburetor -- they do sometimes, and then work only intermittently. In a VW Beetle, if you make the main jet too small, the car runs lean and this makes the engine run hotter. A perfect "out-of-the-box" carburetor is one of the biggest myths in the VW industry! 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. It appears to replace the plug in the bottom of the 30 PICT/1 carburetor float bowl, which has the jet mounted inside and in line with that hole. does anyone have a link to a graphic that explains where it is on the carb? The 34PICT normally has a X127.5 main and a 140Z or 170 air correction jet. The /4 version was used in California and had additional features to reduce emissions. If the idle cut-off valve fails in the shut position, the car will still run (roughly) on the main jets but will stall as soon as you take your foot off the throttle. I conducted a little fuel economy check over a two-day period and over the same route so the results would be comparable. 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). 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. Note: Dave found that NONE of the several top-to-body gaskets provided in the kit was the right size or configuration for his carburetor (he was possibly sent a kit for the earlier series carburettors). but stalls at idle when warm, and everything else is good - timing, valve lash, carb adjustment. We provide the classic VW hobby with tech tips, project advice, and quality parts for VW Restoration, VW Performance and Custom Aircooled VW projects. Another well respected and active VW carburettor rebuilder is TIM. This will have the main jet supplying the fuel, and read the plug again. 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. The only method of getting it exact is to run the car on a dynomometer with an exhaust gas analyser in the exhaust pipe. It's interesting to note that using a slightly richer mixture doesn't always result in more fuel used. We rely heavily on email as the most efficient and accurate way to serve our customers. So, I let it warm up, and set the timing to 32 degrees full advance. If it takes 4 1/2 to 6 turns to peak, go up a size or (1/2 size if you. "Leaving it alone" is fine for a new carburettor but silly when the engines are all at least 30 years old and in different states of health. Assuming a vacuum distributor, the 34PICT/3 carburetor is usually jetted with a X127.5 main jet, and 100Z -120Z air correction jet. Soot will indicate the main jet is a little too large. 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. I don't think you'd honestly notice the difference. Discussion in 'Mech Tech' started by low_light_craig, Jun 9, 2017. low_light_craig. Air correction 75 to 125 and these are changed. The power jet is usually a size 65. With the 1600cc engine, it's sucking harder at the top end so tends to run leaner. The power jet counters the leaner condition at higher rpms, richening the mixture back into balance again. So I replaced it with a 30 PICT-3 carburetor in a good condition. Could you help me with the jetting? 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. 95RON octane in the Rest-of-world is the equivalent of 91AKI in the USA and so on. So VW chose this configuration. These plates provide restriction and also atomize the fuel/air mix better for greater fuel economy. 2 of 2 people found the following review helpful. This will richen the mixture and help eliminate any 009 flat spots. vegas Perform the Idle Adjustment and Timing procedures. I think the original idle jet was a 50, but the replacement jet orifices (orifii?) Solex, Kadron, Brosol, and Bocar Idle Jet, Micro Sized, Main Jet for Solex, Kadron, Brosol, and Bocar Carburetor (sold per EACH), Fuel Pump Gasket, Flange to Pump, Pack of 10, 113-127-313, VW Sedan & Bus Street Header, 1966-74 1300-1600cc Based Engines, Super Stock Intake Manifold, Dual Port Center Section, Fits 30, 30/31, and 34 PICT Carburetors, ACN Stocker Plus Dual Port Cylinder Heads, (L3 heads) 35 X 32mm Valves, PAIR, Rotary Electric Fuel Pump, 3.25 psi Low Pressure, 9mm Fuel Filter Inlet and 7.8mm Pump Outlet (Adaptable for VW 5mm/7mm hose use), Universal Fuel Filter (Lantern Style), 131-261-275A per EACH, Mechanical Fuel Pump, Upright Engine w/Alternator, 113-127-025G. But different gears and different rpm doesn't. Immediate shipment of requested products is NOT guaranteed. 55 idle is fine. It's actually much easier to do if you remove the top of the carburetor and the float. But optimum performance and MPG will be achieved when you use a wide band and tune the carb for 16:1 A/F on cruise, and 13:1 over 1/2 throttle. The modern H30/31 carburetor replaces the 28, 30 and 31 series carburetors and can be used on 1200cc, 1300cc, 1500cc and 1600cc engines with appropriate jetting. Classified ads, photos, shows, links, forums, and technical information for the Volkswagen automobile But we continue to endeavor to answer email inquiries as best we can. Have a look at the size stamped on it too. The exhaust system peashooters started turning black inside as soon as I put the larger jet in. The jet has a slot in the back so it can be loosened with a screwdriver through the hole where the plug was. That means that the jetting requirement for any VW using ethanol-added gasoline/petrol is different to those using straight hydrocarbon gasoline/petrol. 3. The try the same test at a higher speed - a steady 55-60mph. Recommended sizes are given in this article. 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. 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). if you look around to really get it right on! This carburetor will NOT work well with cams with over 270 duration, (same as the stock 34-3 carb). "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. 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. The smaller jets WILL NOT work with the 009 distributor. None of these tests are definitive - just indicative. Now unscrew it exactly 2-1/2 turns. Rob's note regarding modern fuels: There are two major issues with modern fuels. 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. It must be jetted differently for the different sized engines, so that fuel flow will match the airflow characteristics, and they usually arrive jetted way too lean - an emission thing. 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 . Most gasoline in the USA now has at least 10% Ethanol added (E10), and in other countries, SOME fuel grades have 10% ethanol added. But optimum performance and MPG will be achieved when you use a wide band and tune the carb for 16:1 A/F on cruise, and 13:1 over 1/2 throttle. Air is much less dense than gasoline, so that makes sense. Volume control screw O-ring (18)
2-F7 emulsion tubes for the IDF. JET KITS are available if needed. 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). Items that are not expected to be restocked within 2 weeks WILL BE AUTOMATICALLY CANCELLED. Ethanol contains USED oxygen which canoot be burnt again, so adding ethanol to gasoline/petrol, reduces the amount of energy per litre/gallon. Be careful pulling it out -- it's about an inch long. Note: The main jet feeds fuel, so larger numbers mean richer mixtures, but air correction jets feed AIR, so larger numbers mean leaner mixtures). We need to do some research regarding the adjustable main jet. At the beginning I started to use a Solex 30 PICT-2. by vwlover77 Fri May 05, 2017 6:58 pm. If the color is rich grey, you're about right. carburetors are discussed on this page -, General Exploded View
The carburetor was a little "leaky" around the shafts. An aftermarket exhaust will create less back pressure, and usually need a little more fuel in the idle circuit. The jet has the size stamped on it, which you may or may not be able to read without a magnifying glass.). (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 know a lot of customers with this same view, so we decided to make these for you! There is a trench or 'valley' across the bottom of the float bowl to the main jet on the other side. The extra advance helps reduce the 009 flat spot just a little. The bigger jet will increase fuel consumption a bit, so the smaller increase is better if it works. Now I have installed a newer Solex Brosol 30/31 carburetor (the Brazilian one), in good shape. 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. The Pilot Jet Valve (idle jet) would be the g55. Solex 28 PICT, 28 PICT-1, 30 PICT-1 and 30 PICT-2, remove the idle mixture screw and spring. So be sure to remove the gasket and store it carefully. Just start off with a larger than normal size (150 maybe) and use the screw to increase/decrease the actual hole size. 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. Dave jetted his new carburetor as follows: main jet - X130; idle jet - 55; air correction jet - 80Z. Show Quoted Text . Carburetor-to-intake manifold gasket. If you do not hear this clicking sound, it's time to replace the idle cut-off valve. Seller pays for return postage. EMPI Performance Products Pict-3 34 Direct replacement for the original Solex 34PICT3 - comes with 70 Air Jet - 127.5 Main Jet - 55 Idle Jet SO-100 $ 28.62 Solex Pict-3 28/30/31/34 Rebuild kit G1134 $ 3.25 Gasket - Flange Gasket - ID 1.540 98-1288-B $ 189.95 . Remember on the 34PICT-3 the idle jet affects drivability and power up to about 2,000 rpm when the main jet takes over. If you have a significantly larger idle jet (e.g., 70 or so), John Connolly recommends going down until you can not get a good engine response with the mixture screws anymore. Sent from my SM-G930F using Tapatalk There are a few fuels which have up to 85% ethanol in them (E85). 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! Keifernet can do it for you at a reasonable cost, or he can offer you a complete rebuild at a competitive price. Carbs help Solex 32 34 Z2 Overclockers UK Forums. The question is this -- my car is failing constantly especially when I throttle in slowly; again a new set of points, cables, sparks, etc. Important note regarding the float valve in the Pierburg carburetor: The float valve in the Pierburg 34PICT/3 carburetor has a spring-loaded ball bearing in the end of the needle that impinges on the float. Ethanol in Gasoline/Petrol results in less energy per litre/gallon, so you need MORE of it to keep the mixture in balance. The last three carburetors are more sensitive, and so the lack of vacuum advance on the 009 makes more of an impact. AU $0.86 (approx 0.48)Australia Post International Standard. May 13, 2014 @ 5:57 am. much has changed in recent years. If you have a 009 (centrifugal advance) distributor, you may find that the spark plugs still seem a little dry/burnt looking at medium speeds , or the car lacks acceleration in the mid ranges. Both clearances are essential; If the accelerator pump linkage rubs on either end, the throttle lever will not be able to return all the way to the stepped cam, the result being an excessively high idle that cannot be controlled with the bypass screw. Do not allow cleaning solvent to come in contact with skin. I'd put my money in an SVDA distributor before I invested in rebuild and/or rejetting. The air corrections I have are 125z, 170z and in the carburetor a 135z. There is an pilot (idle) jet on all carburetors too - these are normally left at 55 for most carburetors (28, 30, H30/31 and 34 series), on any engine size (since it's only feeding the engine at small throttle settings anyway). If you install a single carb on GL (34/3 PICT) always keep in mind the following: 1. Discussion in 'Mech Tech' started by low_light_craig, Jun 9, 2017. Note: It is very important that you install the correct needle seat gasket. See the discussion of jetting with the 009 distributor below for needed revisions to the jetting of the 34 PICT/3 carburetor in this application. 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). My distributor is a vacuum advance (with a centrifugal?). valve - idle cut off (30pict-2,3) 5. plastic cap 26. plug - av x. fuel jet 6. spring - throttle return 27. Try to use the leanest main jet you can -- too rich will only result in the cylinder oil film being diluted more, and this means higher cylinder wear. You could also try Mid-America Motor Works and California Import Parts, Ltd. if you have trouble finding them. The condenser is 1 237 330 251. So a 34PICT/3 carburetor with an 009 distributor should be jetted with an X130 or X132.5 main jet, and an 80-100Z air correction. Product Description. Automatic
included complete disassembly, several day soak (all metal bits and carb. Venturi size refers to the narrowest channel in the carburetor throat. PRODUCT IMAGES are representative only. IDLE JET .55 .65 .60 (d) VENTURII 40mm . 34 PICT-3 carb, SOLEX 34MM ; Fitment: Carburetor Fits For any 1600cc VW Air cooled Type 1 engines,such as: 1971-1979 Volkswagen Beetle, 1971-1979 Volkswagen Super Beetle, 1973-1974 Volkswagen Thing, 1971-1974 Volkswagen Karmann Ghia, 1967-1973 Volkswagen . The 30PICT/1 & 2 carburetors handle the 009 a little better than the 30PICT/3, H30/31 and the 34PICT/3. You can find 57s, etc. I have EMPI 34 pict 3 on GL1100 55 jet 130 jet idles 1000-1100. We have had great results with these factory bench tested carburetors. for IDFs, make the idle jet 1.25 the size of the throttle body. Use stock vacuum line from air-intake #4 for CDI control unit. 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. Jetting was tweaked over the years for various carbs and territories. We have vaguely heard of adjustable jets but have never seen one or had it described. Or should I open what I have or rob from a newer model? $7.99 . 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. VW set up a vacuum advance distributor, and the stock jetting in a 34 pict 3 for a 100% stock engine. 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). Price: $ 399.95. Make sure this fits by entering your model number. 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. Idle Shut Off Valve, 34-3, 34-4, and 34 PDSIT 2/3 Carburetors, 049-129-412C Is the valve on the side of the carburetor that provides air to the idle circuit. The 205L number is a Bosch number, the other one is a VW number. I've used this particular carburetor with a 1600cc dual port engine and it works fine with the same main jet, but seems to like a fractionally larger X130 air correction jet (it runs a little rich with the X125 air correction jet). Idle jets are available in small increments. The fuel flow through each jet is determined by the airflow which creates a low pressure area near that jet. "Lean" means less fuel with the same amount of air, and of course "rich" is the opposite. The standard jetting that the 30PICT/1 & 2 carburetors came with is size X122.5 or X125 main, size 55 idle, and size 125Z air correction jets. 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. The biggest problem I have with it was the fuel consumption. The air correction jet has the emulsion tube attached to it -- this "foams" the fuel before it's added to the airstream in the throat. *** 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. Posted: Tue Nov 06, 2018 11:47 am Post subject: Re: Solex 34 pict 3 1835cc. The air correction jet starts leaning the mixture to bring it back into balance, but as the rpms (airflow) rises to near the maximum for that carburettor, the air correction jet works too well, running the engine lean. Jet cleaning; Fast idle adjustment; Volume control screw initial adjustment; 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. On the /3 and /4 carburetors - it looks like a bolt with a tiny silver plug in the center. Use a steady throttle - minimum acceleration. In either case, spending the time to properly jet your carburetor is a very worthwhile task. So how do you know which to use? MSRP Price: $9.11 You Save 12%. 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. Here's the story: '68 bug with a ~'73 engine, 1600 dp, dual vac dizzy. We sincerely appreciate your patience while we are doing these site upgrades. I have 4-5 I've collected over the years, and the smaller ones can be re-drilled to the larger sizes. CATALOG ERRORS: Although every effort has been made to provide accurate pricing and product technical and vehicle application information, THIS CATALOG MAY CONTAIN ERRORS (typographical, photographic, or informational). Main jets are primarily from 2500-4500rpms, and Air jets affect the engine from 3500/4000 on up. . Bentley (page 20 of the 'fuel' section -- table of 'carburetor setting and jets') says the X130 was normal for '71-'72 34PICTs, and X127.5 was normal for '73-'74s (non-California models). Fillister head screw and lock washer (upper
A loss of power is the result -- about 58hp instead of 60hp. The venturi sizes listed below are the sizes supplied by Weber in new carburetors. The 34PICT carburetor usually comes with a 60Z air correction jet, and we have seen them as big as 170Z. . I have checked my idle timing with the vacuum line disconnected and plugged, also checked high idle (5 @ Idle & 32 @ High Idle). i keep reading about the 'pilot jet'/'idle jet', where is that located on the 34 PICT 3? 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). Aircooled.Net, Inc. is in no way affiliated or associated with Volkswagen AG or Volkswagen ("VW") of America. 737-240. And the second issue is the presence of Ethanol (alcohol) in gasolines. 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. Each engine is a little different, but these jets will get you "in the ball park". Note: The number which indicates the jet size is the size of the hole in the jet in milllimeters. It this case you would definitely need to reduce the main jet size to say the size 122.5 or the 120. For example, when used on a 1300cc engine with a vacuum distributor, the H30/31 should usually have a main jet of X122.5 and an air correction jet of about 140Z; but when used in a 1600cc single port engine, it should have a 125 main jet and a 125 or 130 air correction jet. If it's working, you'll hear a clicking sound as the relay pulls in. If the valve sticks in the open position, the idle fuel circuit will remain open, so if the engine is still turning it will still draw fuel through the idle jet, resulting in running on if there is a hot spot in one or more cylinders. Location: Miami. (See our Automatic Choke Discussion and Adjustment Procedure.). Once you have those two sorted, then try a faster run and from 60 try flooring the throttle - if you get a good smooth response the air correction jet should be OK, but if it tends to stumble a little or feel breathless, then either the main jet is a little small or the air correction jet is a little large. 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. Checking and adjusting cold idle speed =>page 22-53 Throttle valve positioner DP case, 1641 P & C, w/ Scat C25 Cam, & stock heads. Currently our response time to emails is slow (we are severely short-staffed). Basically, the emulsion tube changes the diameter and location of small holes in it's body.