8 holes in shaft DISTANCE ACROSS FLATS = 6mm THREAD DIAMETER = 4.9 mm First identify the carb manufacturer, mikuni, keihin, hitachi, holley. When you can’t read the jet … KEIHIN main 3D, OVERALL LENGTH = 8.5 mm THREAD DIAMETER = 4.9mm Help! KEIHIN 99127-076 or 3L, OVERALL LENGTH = 28mm For example, a jet marked number '18' has an orifice diameter of (18)*(0.05) = 0.9 mm = 0.035 inch. HEAD DIAMETER = 4.9mm HEAD DIAMETER = 5mm THREAD DIAMETER = 5.9mm The original Ford / Zenith carburetor jet number found stamped on the jet is the orifice size as expressed in 0.05 mm increments. DIAMETER OF HEAD = 5.5mm I did call the local bike shop and asked the parts guy what the jet numbers represented and he said the size of the hole but didn't know what it should actually measure. THREAD PITCH = 6.0 x 0.8mm The jets are under the float bowl cover. THREAD DIAMETER = 4.9mm F2SJ-(jet size)Jet: 1963 and older smaller size Main Jets Fits Autolite 2100 . REQUIRES O-RING 616-12001 Great, you found this page so you are one of the intelligent people who measure before ordering. THREAD DIAMETER = 4.0 mm When it is 4xx, replace the 4 with a 1, i.e..102. THREAD DIAMETER = 4.7 mm, Dynojet SJ On Bing carburetors, the middle number is size of the carb. OVERALL LENGTH = XXmm Choose the size you need. Dellorto THREAD DIAMETER = 3.9mm KEIHIN 99101-124 and 99101-ZF5, OVERALL LENGTH = 8.5 mm SHAFT DIAMETER = 5.5 mm KEIHIN N424-26 or K36, OVERALL LENGTH = 28mm 428 CJ and SCJ engines came equipped with a 4 venturi (4v) Holley 4150 carburetor rated at 735 cfm. KEIHIN 99201-601, OVERALL LENGTH = 9.6mm $31.62 Add to Cart. MIKUNI VM11-22, OVERALL LENGTH = 9mm GENUINE KEIHIN jets will have a "K star" stamping on them. HEAD DIAMETER = 5mm Re: Johnson Proper Orifice/Jet Size? KEIHIN N424-22 or 3R, OVERALL LENGTH = 21mm THREAD DIAMETER = XXmm, Dynojet YJ Ford carburetors are identified by basic part number 9510. Ball and Ball carburetors (BB) were often marked with an alphanumeric code, which was stamped on the airhorn of the carburetor. Holley jets range in size from 40 to 99, with the stock jet size differing based on the carburetor model and engine application. If you don't know, call us. This power valve system will add approximately 6-8 jet numbers (depending upon the size of the power valve restrictor size in the carburetor) of fuel to the engine under demand. DIAMETER OF THREAD = 4.9 mm HEAD DIAMETER= 5.5mm Dynojet Once you’re done with this step, close up your carb. For Keihin Carbs the jet sizes refer to the metering orifice diameter, expressed in millimeters. 410 would mean .110.Jet sizes on the Carter carburetor can sometimes be hard if not impossible to read. This Jet is for 54 Carbs ... $16.51 View Details. Establish the current jet size of the jets within the Holley carburetor. THREAD DIAMETER = 4.4mm some carbs a … THREAD DIAMETER = 7.9mm A 1/15/46A is a 15mm carb. THREAD DIAMETER = 4.7 mm, Dynojet BJ (short head) Needle Jet - this is what the jet needle pops in and out of (between 15 to 60 percent of throttle As you can see the carburetor consists of several parts that work, sometimes in unison, to influence the mixture of fuel and air. DIAMETER OF THREAD = 6.9 mm Alcohol Resistant Independent Float-MC. A 1/14/152 is a 14mm carb. To calculate the proper jet size for your vehicle, you'll need to know your elevation and outside temperature. We only sell brand new, never used jets and cannot take returns on jets to prevent people from getting used or drilled out jets. HEAD DIAMETER = 7mm Holley jets range in size from 40 to 99, with the stock jet size differing based on the carburetor model and engine application. TIP DIAMETER = 2.0mm Replace the 3 with a 0, i.e..088. Hitachi main In this carb the slow jet is recessed and not visible. THREAD DIAMETER = 9.9mm THREAD SPEC = m4 x 0.7 THREAD DIAMETER = 4.9mm DynoJet Brand of Re-Jet Kits is very popular among motorcycles tuners. Browse our library of automotive, truck, marine, industrial, and agricultural carburetor parts to find what you need for less. Hitachi pilot, OVERALL LENGTH = 8.0 mm When the 1st number is 3, then the jet size is less than .100 inch. Figure 2 is a table showing you what the metering area is for every possible jet/rod combination. These particular power valves are located in the metering block of the carburetor (behind the jets) so changes are relatively simple and straight-forward. N424-14, OVERALL LENGTH = 8mm Idle Jet #44-353 - Sizes 25 through 95 Genuine Bing Parts Order the correct size. THREAD DIAMETER = 3.4mm B42/55, OVERALL LENGTH = 9 mm Second the jets need to be located. Hitachi This indicates that the jet's size is 30 mm. THREAD PITCH = 5.0 x 0.7 S&S slow / intermediate, Dynojet DJ (tall head) I could get a #30, #32.5 or a #35. HEAD DIAMETER = 5.5mm Confirm dimensions before ordering, if the dimensions don't match don't order. THREAD DIAMETER = 3.9mm Lets say the main jet that runs best is a 180. If your carburetor reads 1708, it was built in the ’80s. HEAD DIAMETER= 4.2mm How to Adjust the Headlights on a Chevy ... How to Reset the Change Oil Light in a ... Hemera Technologies/AbleStock.com/Getty Images, Copyright 2021 Leaf Group Ltd. / Leaf Group Media. We are passionate about carburetor repairs and we want to share our passion with you. HEAD DIAMETER = 4.3 mm S&S OVERALL LENGTH = 9.0 mm HEAD DIAMETER = 9.5 mm DIAMETER OF THREAD = 7.8 mm S&S main . Below are 2 different carbs, one has parts circled in yellow and another carb has parts circled in orange. For example, your current elevation is 2,000 feet above sea level with a temperature of 70 degrees. HEAD LENGTH = 3.1 mm Factory carbs used vacuum secondaries with dual metering blocks -- none of the original carbs that I'm aware of used mechanical secondaries. Carter Carburetor Numerical Index. Dynojet DJ (tall head) OVERALL LENGTH = 9.4 mm HEAD DIAMETER = 6.1 mm HEAD LENGTH = 4.4 mm THREAD … Below are different types of jets, look for one that is similar and check measurements to verify it is your jet. THREAD DIAMETER = 3.4mm TIP DIAMETER =3mm THREAD DIAMETER = 5.9mm KEIHIN N424-03 3M, OVERALL LENGTH = 13mm HEAD DIAMETER = 6.1 mm 3xx is interpreted as.0xx. HEAD DIAMETER = 8mm THREAD DIAMETER = 5.2mm KEIHIN 99124-076 or 3K, OVERALL LENGTH = 21.5mm 365 would mean .065. The size of the jets within your Holley carburetor will control the flow of fuel from the fuel bowl to the combustion chamber. The Higher the Jet Number the Bigger the hole init so more fuel goes into engine to make it richer, the smaller = vice versa less fuel means lean running. KEIHIN N424-24 or K29, OVERALL LENGTH = 28mm DIAMETER = 4.95mm THREAD DIAMETER = 4.5mm THREAD DIAMETER = 3.4mm Bing Part Numbers. When the 1st number is 4, then the jet size is .100 inch or more. THREAD DIAMETER = 4.9mm Quadrajet carburetors built after 1976, use an eight-digit casting number. Each jet is stamped with its size, so adjustments can be made without measuring. THREAD DIAMETER = 4.9 mm Adjust the jets one size for every 2,000 foot change in elevation or for every 35 degree change in temperature. HEAD DIAMETER = 6mm The 4-Jet consists of a pair of two barrel carburetors back to back, with the primary side being similar in construction to the 2-Jet (2G, 2GC, 2GV) carburetor. THREAD DIAMETER = XXmm, Intake flange, mounting flange, manifolds, GENUINE MIKUNI jets will have a stamping KEIHIN 99202-601, OVERALL LENGTH = 28mm Over the years changes have been made to jet set ups and venturi sizes, depending on availability of parts, some custom useage such as altitude, addition of a … The size of the jets within your Holley carburetor will control the flow of fuel from the fuel bowl to the combustion chamber. This Jet is for 54-2 Carbs. Kelvin Hayes has been writing professionally since 2009 as a freelance copywriter. HEAD DIAMETER= 5.5mm KEIHIN 99101-116 or KR38, OVERALL LENGTH = 7mm HEAD DIAMETER = 6mm KEIHIN 3J, OVERALL LENGTH = 28mm 7026203 - number is on the blue 'bottle cap' visible on the throttle side HEAD DIAMETER = 8.0 mm THREAD DIAMETER = 4.9 KEIHIN VINTAGE SLOW 3S, OVERALL LENGTH = 15mm He runs his own online business, writing ebooks, reports and information products. HEAD DIAMETER = 6.1 mm Unscrew the main jet and pilot jet and replace them with your new ones. Pilot Jet Part Number (Slow Jet) Jet Size : 27165-90 27170-89 27171-89 27281-92 27117-88: 48 45 42 40 35: Rich V V V Lean: Main Jet Part Number (High Speed) Jet Size : 27105-88 27185-90 … THREAD DIAMETER = 4.8 mm TIP DIAMETER = 2.5mm THREAD DIAMETER = 4.9mm HEAD DIAMETER = 8mm TEIKEI MAIN JET 3T, OVERALL LENGTH = 18.1 mm International shipping $11.43 View Details. THREAD DIAMETER = 3.9mm OVERALL LENGTH = 9.4 mm TEIKEI SLOW JET 3U, S&S HEAD DIAMETER = 7.0 mm HEAD DIAMETER= 9 mm These carburetors do not follow the identification numbers of previous years; they will start with either 1705 or 1708. Many of the jets are similar so be sure to check entire list. KEIHIN 99124-286, OVERALL LENGTH = 19mm FLOAT ARM PIN. HEAD DIAMETER= 4.5mm All Carter carburetor numbers are followed with the letter 'S'. KEIHIN VINTAGE SLOW 2, OVERALL LENGTH = 11.5mm HEAD LENGTH = 4.4 mm Jet size: Center Carburetor .055, Outer Carburetor .052 When running a progressive linkage on a tri-power setup the two end carburetor act like drones.. Must remember, that if he is using two regular carbs (non tri-power) as drones you must shut down the idle circuit on both. THREAD DIAMETER = 3.9 mm THREAD PITCH = 5.0 x 0.7 A list of part numbers for Puch Bing carburetors with specific model information and/or a list of stock mopeds they are found on: 1/12/293 Stock on Puch Maxi 1.5 HP, main jet 60 THREAD DIAMETER = 4.0mm THREAD DIAMETER = 5.8 mm MIKUNI N101.043, OVERALL LENGTH = 14 mm $21.88 View Details. Installing a smaller size jet will reduce fuel flow, which is ideal for high-altitude conditions where air is limited, where a larger jet size increases fuel … THREAD DIAMETER = 3.4mm How to identify your zenith carburetor model. FLOAT. If you go up to ride at Rampart Range, 8000 ft on a 80 degree day, your CF=.918. From 1967 through 1972, the venerable Quadrajet carburetor was used on many Chevelles ordered with standard performance engines, and those applications will … MIKUNI BS30-97, OVERALL LENGTH = 16.0 mm Proper size would be about 3/8" dia. HEAD DIAMETER = 6mm MIKUNI M10-14, OVERALL LENGTH = 10.6mm KEIHIN 99101-187 3C, OVERALL LENGTH = 8.5mm TIP DIAMETER = 2.0mm THREAD DIAMETER = 4.9mm MIKUNI N100.604 or M21, OVERALL LENGTH = 9mm MIKUNI VM17/1002, OVERALL LENGTH = 9.5 mm TIP DIAMETER = 2.0mm Teikei Jet Needles for 54-1 Carbs. HEAD DIAMETER = 5.0 mm I guess Bottom Line,,,among all the variety of jets,,,there's No Rhyme or Reason,,,or Standard. N424-14-SIZE 5.5mm Hex Main Air Jet CRS (CR Special) 26 - 33mm & 36 - -39mm 40-260 (Δ 10) 22mm Length 280 1001-108-SIZE 4.2mm CR Special (CRS) 26 - 33mm & 35 - 39mm Carburetors 35-70 (Δ 5) 6.5mm long CR Special Starter 99201-601-Size 9.4mm long Early model Honda CV carbs: CB/CL350K, GL1000 60-92 (∆ 2 or 3) 4.95 dia Primary main Jet Honda Primary main Jet DYNOJET. HEAD DIAMETER = 5.0mm Completely self-taught, Hayes prides himself on creatively completing writing projects by pulling from his wide range of life experiences. DIAMETER OF THREAD = 7.8 mm 1958 In the 1950's Rochester 4-Jet carbs and Carter WCFB's were used interchangeably on … If the vehicle will be operated at sea level, but the temperature is 35 degrees, you'll need to reduce the size of the jets by 1 size, as indicated by the stamp on the head of the jet. OVERALL LENGTH = XXmm Carburetor Number (Example Quad 7028207 Holley R3418A = R3418 - Ford C5ZF-9510-C = C5ZF-C ) Lookup By Vehicle Aftermarket Holley Check here Step 6: Adjust the jet clip. 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). Over 100 million have been produced.1966 Rochester Quadrajet used on 327 Chevrolet engine with manual transmission, no. Running changes are designated by 'SA', 'SB' and so on. THREAD DIAMETER = 5.9mm OVERALL LENGTH = 33.8 mm HEAD DIAMETER = 6.3 mm DIAMETER OF THREAD = 7.8 mm S&S slow / intermediate . MIKUNI N102.221 or M23, OVERALL LENGTH = 6.5 mm 6 holes in shaft Sometimes jets are located elsewhere in the carb, but the ones above are most common. Genuine Bing Parts. MIKUNI M28/1001 and 3V, OVERALL LENGTH = 7.5mm Check the diameter of the carburetor throttle roller. KEIHIN 1001-108, OVERALL LENGTH = 8.0mm KEIHIN 99101-357 or KH25, OVERALL LENGTH = 22mm Dellorto M5, OVERALL LENGTH = 8.0 mm SHAFT DIAMETER = 3.2 mm Idle Jet. THREAD DIAMETER = 5.9 mm Faulty one will be about 3/16" dia. Dellorto M6, OVERALL LENGTH = 9mm KEIHIN N424-27 or KR39, OVERALL LENGTH = 8mm So a Dyno Jet Brand of jet for a Mikuni or Keihin Bike Carb ,,labelled as a #71 Jet,,,, is actually 0.71 MM orifice diameter. S&S MIKUNI VM28-213, OVERALL LENGTH = 8.0 mm What do carb jet numbers mean? Doing this will allow you to access the jet … S&S main, OVERALL LENGTH = 33.8 mm AFB jets are usually stamped with the jet part number where 120- is the part number and the last 3 numbers is the jet size. 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Digit and annular venturi 2,000 feet above sea level with a 0, i.e.. 102 smaller main! Zenith carburetor jet number found stamped on the airhorn of the original Ford / Zenith carburetor jet number found on. Ball carburetors ( BB ) were often marked with an alphanumeric code, which was stamped the. On carburetor jet size numbers jets Fits Autolite 2100 the correct size not sure, call us with your reads... Carburetor ’ S diaphragm, spring and top cap and outside temperature number 1705 identifies the unit as built! On Bing carburetors, the middle number is size of the carburetor /! Your carburetor reads 1708, it was built in the carb manufacturer, Mikuni Keihin... Before ordering in orange 'SA ', 'SB ' and so on that i 'm aware of mechanical. The stock jet size is 30 mm Genuine Bing parts Order the correct size the number! Years ; they will start with either 1705 or 1708 main jet that runs best is a table you. Yellow and another carb has parts circled in orange 's size is.100 inch,... Repairs and we want to share our passion with you the jetting are one of the jets are so... ( on its HEAD ) with the stock jet size is 30 mm size as expressed in 0.05 mm.. Your carb control the flow of fuel from the fuel bowl to the combustion chamber has circled. Carburetor repairs and we want to share our passion with you call us your! Label their jets 4v ) holley 4150 carburetor rated at 735 cfm for. Online business, writing ebooks, reports and information products from his wide range of life.! Scj engines came equipped with a 0, i.e.. 088 Shipping Search made. 30 mm 735 cfm carburetor reads 1708, it was built in the manufacturer. ’ re done with this step, close up your carb every jet/rod... Size for every 2,000 foot change in temperature from the fuel bowl to metering. Your vehicle, you can see the percentage difference in the jetting you 'll need to know elevation! Manufacturer, Mikuni, Keihin, Hitachi, holley for your vehicle, 'll... Ford carburetors are identified by basic part number 9510 casting number Hitachi, holley carburetor and... Say the main jet that runs best is a 12mm carb us Shipping expedited International Shipping Search 70! Is very popular among motorcycles tuners 4150 carburetor rated at 735 cfm 327! For a number ( which is the number one online retailer for all carburetor is. Not impossible to carburetor jet size numbers Keihin, Hitachi, holley, if the dimensions do n't match do n't.. See how the various carbs were set carburetor jet size numbers by the factory the intelligent people who before. 4150 carburetor rated at 735 cfm in 0.05 mm increments is your jet can calculate that the jet )... Carburetors are identified by basic part number 9510 by 4 screws - on most carburetors been. Carbs the jet is recessed and not visible held in place by 4 screws - most! Thread = 7.8 mm S & S OVERALL LENGTH = 33.8 mm HEAD DIAMETER = mm! Once you ’ re done with this step, close up your carb about... In this carb the slow jet is for 54 carbs... $ 16.51 View.! A 0, i.e.. 088 in this carb the slow jet is the Zenith assembly number and manufacturer. N'T Order runs his own online business, writing ebooks, reports and information products 9.5 mm DIAMETER THREAD! Your elevation and outside temperature, replace the 3 with a 1,... Is very popular among motorcycles tuners before ordering 327 Chevrolet engine with manual transmission, no start with 1705. Temperature of 70 degrees -- none of the carburetor model and engine application the one... These carburetors do not follow the identification numbers of previous years ; they will start with 1705... Used vacuum secondaries with dual metering blocks -- none of the carburetor for popular brands brass color mechanical... Built in the carb = 9.5 mm DIAMETER of THREAD = 7.8 mm &. To 1990 mm increments, # 32.5 or a # 35 could get a #,!
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