Bing jets are in Bing and some Encarwi carburetors.
3.5 mm thread (M3.5-0.60) Bing jets are on Puch-Bing, Solo-Bing, Kreidler-Bing, and Encarwi.
4.0 mm thread (M4.0-0.70) Bing jets are on Sachs-Bing, late 80’s AD-Bing and 90’s Korado-Bing.
Myrons Mopeds Bing Jet Sizes Chart
These jets are on other 1970’s – 80’s small engines with Bing carburetors.
The Bing 3.5 main jets are also idle jets on some bigger Keihin carbs.
The Bing 4.0 main jets are also idle jets on some bigger Dellorto carbs
Original Bing jets are numbered wrong, in a sense. The jet number is not the millimeter size. An original Bing 54 is actually 0.51 mm, not 0.54. This was discovered this in the early 2000’s when aftermarket Bing jets came out. 200 jets were carefully measured with precise wire guages, and then plotted on the graph at right. The original jets (and the first A&R generics) form one line. All other generic jets form a different line.
Generic Bing jets are numbered correctly. The size they say is the millimeters they are. So a generic Bing 54 is actually 0.54 mm.
Bing Jets (3.5 mm)
part # maker jet# close to measured size price applications
78drill custom #00 =Bing48 0.016″ = #78 drill —————————————————————
3.5×44 custom #00 =Bing46 0.0173″=0.440mm $15.0 soldered, 78-drilled, then filed with .017 guitar string
Bing46 original #46 =Bing46 0.0175″=0.445mm $18.0 76-83 Tomos early A3 models (30, 25, and 20mph)
3.5×45 custom #00 =Bing47 0.0177″=0.450mm -N/A–
77drill custom #00 =Bing48 0.018″ = #77 drill —————————————————————
3.5×46 custom #00 =Bing48 0.0181″=0.460mm -N/A–
Bing48 original #48 =Bing48 0.0182″=0.462mm $15.0 78-80 Puch (2-spd hi torque Ø12 carb 20mph)
3.5×47 custom #00 =Bing49 0.0185″=0.470mm -N/A–
Bing50 original #50 =Bing50 0.0188″=0.478mm none 76-78 Batavus (Laura M48 Ø8 carb 20mph)
3.5×48 generic #48 =Bing51 0.0190″=0.480mm $4.00
3.5×49 custom #00 =Bing52 0.0190″=0.490mm -N/A–
Bing52 original #52 =Bing52 0.0194″=0.493mm $5.00 76-78 Batavus (Laura M48 Ø8 carb 25 mph)
3.5×50 generic #50 =Bing53 0.0195″=0.500mm $4.00
76drill custom #00 =Bing48 0.020″ = #76 drill —————————————————————
Bing54 original #54 =Bing54 0.0200″=0.508mm $5.00 74-83 Puch (1-spd alum. cylinder, Ø12 carb 2.22, 20mph)
3.5×51 generic #51 =Bing54 0.0201″=0.510mm
3.5×52 generic #52 =Bing55 0.0204″=0.520mm $4.00
Bing56 original #56 =Bing56 0.0206″=0.523mm $11.0 77-80 Batavus M48 and M56 (30), 80-83 Trac M56 models
3.5×53 generic #53 =Bing56 0.0209″=0.531mm none
75drill custom #00 =Bing48 0.021″ = #75 drill —————————————————————
3.5×54 generic #54 =Bing57 0.0212″=0.540mm $4.00
Bing58 original #58 =Bing58 0.0213″=0.541mm $10.0 78-83 Puch (2-spd hi torque cyl. Ø12 carb 2.22 30mph)
3.5×55 generic #55 =Bing59 0.0217″=0.551mm $4.00
3.5×56 generic #56 =Bing60 0.0220″=0.561mm $4.00
Bing60 original #60 =Bing60 0.0222″=0.564mm none 78-83 Puch (1-spd hi torque cyl. Ø12 carb 2.22 30mph)
3.5×57 generic #57 =Bing61 0.0224″=0.571mm $4.00
75drill custom #00 =Bing48 0.0225″=#74 drill —————————————————————
3.5×58 generic #58 =Bing62 0.0228″=0.580mm $4.00
Bing62 original #62 =Bing62 0.0229″=0.582mm $7.00
3.5×59 generic #59 =Bing63 0.0232″=0.591mm $4.00
Bing64 original #64 =Bing64 0.0234″=0.594mm $6.00 74-83 Puch (1-spd al cyl Ø14 carb 2.22 needle jet 30mph)
3.5×60 generic #60 =Bing64 0.0235″=0.600mm $4.00
Bing66 original #66 =Bing66 0.0239″=0.607mm none
75drill custom #00 =Bing48 0.024″ = #73 drill —————————————————————
3.5×61 generic #61 =Bing65 0.0240″=0.610mm $4.00
3.5×62 generic #62 =Bing66 0.0244″=0.620mm $4.00
Bing68 original #68 =Bing68 0.0248″=0.630mm none 78 Sears (1s al cyl Ø14 carb 30mph), Kreidler (30mph)
3.5×63 generic #63 =Bing68 0.0248″=0.630mm $4.00
75drill custom #00 =Bing48 0.025″ = #72 drill —————————————————————
3.5×64 generic #64 =Bing69 0.0252″=0.640mm $4.00
Bing70 original #70 =Bing70 0.0254″=0.645mm N/A 84-86 Puch Cobra (Ø14 carb, 2.17 needle jet 25mph)
3.5×65 generic #65 =Bing71 0.0256″=0.650mm $4.00
75drill custom #00 =Bing48 0.026″ = #71 drill —————————————————————
3.5×66 generic #66 =Bing72 0.0260″=0.660mm $4.00
Bing72 original #72 =Bing72 0.0260″=0.660mm N/A 84-86 Puchs had bigger main jets, but smaller needle jets.
3.5×67 generic #67 =Bing73 0.0264″=0.670mm $4.00
Bing74 original #74 =Bing74 0.0267″=0.678mm N/A 1990’s Puch remakes also had 70’s jets, 2.17 needle jets.
3.5×68 generic #68 =Bing74 0.0268″=0.681mm $4.00
3.5×69 generic #69 =Bing75 0.0272″=0.690mm $4.00
Bing76 original #76 =Bing76 0.0273″=0.693mm $6.00
3.5×70 generic #70 =Bing77 0.0278″=0.705mm $4.00
75drill custom #00 =Bing48 0.028″ = #70 drill —————————————————————
3.5×71 generic #71 =Bing78 0.0280″=0.715mm -N/A--
Bing78 original #78 =Bing78 0.0280″=0.711mm N/A
3.5×72 generic #72 =Bing79 0.0283″=0.725mm $4.00
Bing80 original #80 =Bing80 0.0285″=0.724mm N/A
3.5×73 generic #73 =Bing81 0.0287″=0.735mm none
3.5×74 generic #74 =Bing82 0.0291″=0.745mm $4.00
75drill custom #00 =Bing48 0.0292″ = #69 drill —————————————————————
Bing82 original #82 =Bing82 0.0292″=0.742mm $7.00 2000’s Bing Ø15 carb with smaller 2.17 needle jet
3.5×75 generic #75 =Bing83 0.0296″=0.755mm none
Bing84 original #84 =Bing84 0.0300″=0.762mm none 1978-79 Puch Magnum X
cleaning a #25 jet
Bing Jets (4.0 mm)
At right, the smallest of the small. The #25 pilot jet is bigger than wire wheel wires, but smaller than wire brush wires in the background. It’s three hairs wide!
part number maker jet# close to measured size price applications
Tomos243222 Dell. #25 =Bing27 0.0107″=0.272mm $8 Tomos A55 pilot (idle) jet
Tomos243110 Dell. #29 =Bing31 0.0124″=0.314mm $8 same as Tomos #25 idle jet “cleaned” with #80 drill
D1486-030 Dellorto #30 =Bing33 0.0128″=0.325mm $8 good for A55 pilot jet, mix screw 1 turn more out
77drill custom #00 =Bing48 0.0135″ = #80 drill —————————————————————
D1486-032 Dellorto #32 =Bing35 0.014″ = 0.355mm $8 same as drilled with #80 drill, sub for A55 pilot jet
77drill custom #00 =Bing48 0.0145″ = #79 drill —————————————————————
D1486-035 Dellorto #35 =Bing39 0.0149″=0.378mm N/A
77drill custom #00 =Bing48 0.016″ = #78 drill —————————————————————
D1486-040 Dellorto #40 =Bing45 0.0170″=0.431mm $8
4mBing45 Bing orig #45 =Bing45 0.0171″=0.434mm N/A Sachs 504/1A DK (19mph)
77drill custom #00 =Bing48 0.018″ = #77 drill —————————————————————
4mBing48 Bing orig #48 =Bing48 0.018″ = 0.46mm $8
D1486-043 Dellorto #43 =Bing49 0.0182″=0.462mm N/A
4mBing50 Bing orig #50 =Bing50 0.0183″=0.465mm $8 Sachs 504/1B and 505/1B (Ø10 carb 20mph)
D1486-044 Dellorto #44 =Bing51 0.0187″=0.475mm N/A
4.0×48 000 generic #48 =Bing51 0.0189″=0.480mm
D1486-045 Dellorto #45 =Bing51 0.0190″=0.483mm $8
4mBing52 Bing orig #52 =Bing52 0.0194″=0.493mm $8.00 Sachs 504/1A and 505/1A (Ø12 carb 30mph)
D1486-046 Dellorto #46 =Bing52 0.0194″=0.493mm N/A
4.0×50 000 generic #50 =Bing53 0.0197″=0.500mm
76drill custom #00 =Bing48 0.020″ = #76 drill —————————————————————
4mBing54 Bing orig #54 =Bing54 0.0200″=0.508mm $8 ’84-86 Puch Austro Daimler (30mph)
D1486-047 Dellorto #47 =Bing54 0.0198″=0.503mm N/A
D1486-048 Dellorto #48 =Bing55 0.0202″=0.513mm $8 Sachs 504/1A and 505/1A (without air filter box)
4.0×52 000 generic #52 =Bing56 0.0205″=0.520mm
4mBing56 Bing orig #56 =Bing56 0.0206″=0.523mm N/A
D1486-049 Dellorto #49 =Bing56 0.0207″=0.526mm N/A
75drill custom #00 =Bing48 0.021″ = #75 drill —————————————————————
D1486-050 Dellorto #50 =Bing57 0.0210″=0.533mm N/A
4.0×54 000 generic #54 =Bing58 0.0212″=0.540mm
4mBing58 Bing orig #58 =Bing58 0.0213″=0.541mm $8.00 Sachs 504/1D and 505/1D (Ø12 D-carb 30mph)
D1486-051 Dellorto #51 =Bing59 0.0215″=0.546mm N/A
4.0×56 000 generic #56 =Bing51 0.0220″=0.560mm
75drill custom #00 =Bing48 0.0225″=#74 drill —————————————————————
D1486-055 Dellorto #55 =Bing63 0.0230″=0.580mm $8
4.0×58 000 generic #58 =Bing63 0.0230″=0.580mm
4.0×60 000 generic #60 =Bing65 0.0236″=0.600mm
75drill custom #00 =Bing48 0.024″ = #73 drill —————————————————————
4.0×62 000 generic #62 =Bing68 0.0244″=0.620mm
D1486-060 Dellorto #60 =Bing69 0.0250″=0.635mm $8