Bing Jets

October 26, 2011

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 —————————————————————
  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    none  77-80 Batavus M48 and M56 (30), 80-83 Trac M56 models
3.5×53  generic #53 =Bing56 0.0209″=0.531mm  
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  $7.00  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 0.0287″=0.729mm    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   $10  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    N/A  ’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    N/A  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 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




Bing Carburetor Service

May 3, 2008
Bing VergaserWelcome, Carb Elbows: Long and Short         Scroll Down to See Topic 
1. Exploded View and Parts Names
2. Carburetor Service Info Sheet
3. Bing Float Needles: Rubber tip and Metal tip
4. Fuel Mixture is Controlled by Five Things

Welcome to Myrons Bing Carburetor Service. 

Sachs Bings can have long or short cable elbows.

Puch Bings can have long or short cable elbows.











Sachs Bing Cable Elbows: Left photo above, left is the long carb elbow, used on KTM Foxi, Sparta Buddy, and most Sparta Foxi models. Right, is the short carb elbow used on other Sachs engine models. The Sachs elbows are 7mm, not 6mm threads like Puch ones. The bigger elbow allows the throttle cable small end to pass through the 6mm adjuster. So Sachs double-ended throttle cables do not come with adjusters. The adjuster stays with the elbow. Puch Bings have 6mm elbow threads, and 5mm adjuster threads, too small for the cable end to pass through. So Puch double ended throttle cables have the 5mm adjuster trapped in them.    

Puch Bing Cable Elbows: Right photo above, left is the long carb elbow, used on Maxi models, also with the black choke extension. Right, is the short carb elbow used on Magnum type models. The current aftermarket “Puch” throttle cables are made for the short carb elbow. They idle way fast if used with the long elbow, because the slide is not allowed to go fully down to idle. Myrons sells a long elbow throttle cable, for Puch Maxi, made from a modified “Puch” throttle cable. The wire needs to be about 12mm longer. The long elbow comes on Maxi type sheet metal frame models. The short elbow comes on Magnum type tube frames, such as Sears Free Spirit or JC Penney Pinto. The short elbow is so your foot does not hit it when you get on and off the bike. See the exploded view diagram below. Other Bing moped (under 15mm venturi) carburetors are the Sachs Bing, Kreidler Bing, Solo Bing, Tomos Encarwi, Batavus Encarwi, Trac Encarwi. Much bigger Bing carburetors are also on BMW, KTM, Penton, Sachs, Maico, DKW motorcycles, all made in or near Germany.


1. Exploded View and Parts Names
















2. Carburetor Service Info Sheet

Below, the choke slide and throttle slide must be installed simultaneously. It is difficult. The throttle slide has a slot that must line up with a prong in the carb body. The top of the choke slide slides onto a deep wide notch at the bottom of the choke rod, so moving the choke rod moves the choke slide. It often gets left out or disconnected. When the choke slide is disconnected from the choke rod, the choke will be “on”, blocking off the air supply, whenever the throttle slide is down or closed. Normally when a Puch is given full throttle, the choke slide and rod are lifted all the way up until it clicks. The click is the choke rod clip #24 settling into the clip groove near the middle of the choke rod #23. When the throttle cable is not adjusted tight enough, the choke is not lifted all the way off, and it does not click until you manually reach down and pull up on the choke rod. When the throttle cable is adjusted too tight, the engine races and does not idle slow, even with the idle screw loosened all the way. See also General Carburetor Service and Jetting for how to clean and adjust carbs in general. 


White Flakes

These white flakes were the cause of a customer’s Puch not running. By chance a tiny spec broke off and lodged in the main jet.






















3. Bing Float Needles 

All “Bing Puch Carbs” have the slotted float type float needle with a rubber cone tip, except for some of the Sears Free Spirit 1/14/163  and 1/14/164 carbs, which have a Sachs Bing type float needle that does not lock into a slot in the float and has a metal cone tip.

4. What part controls mixture depends on how much throttle opening

Slide Carburetors Diagram

Jet Drills

January 27, 2007

Find out more about the Jet Drills »