Bing 54 carburetor jetting, Bing 54 carburetors jet chart for Rotax aircraft engines.

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Bing 54 carburetors jet chart.
Recommended Jetting for Bing Carburetors used on Rotax aircraft engines. The following is the factory recommended jet for Bing carburetors at sea level and 70F degrees. Apply the Bing Main Jet Correction Chart shown at the bottom of the page to compensate for temperature and altitude at your location. Jetting for engines equipped with intake silencers are also listed.

Rotax Engines Without Intake Silencer

Engine Type	Main Jet	Idler Jet	Needle Jet	Jet Needle	Clip from top	Air Screw
Rotax 277	148	45	2.72	8L2	2	1.0
Rotax 377	165	45	2.70	8O2	2	0.5
Rotax 447	165	45	2.70	15K2	2	0.5
Rotax 447 DC	135	50	2.70	6G1	3	1.0
Rotax 503 SC Up to Serial #3785371	180	45	2.74	8G2	3	0.5
Rotax 503 SC After Serial #3785372	185	45	2.72	15K2	3	0.5
Rotax 503 DC	158	45	2.70	11K2	2	0.5
Rotax 532 SC	195	55	2.74	15K2	3	1.0
Rotax 532/582 DC	165	55	2.72	11G2	3	1.0
Rotax 618 DC	158	55	2.72	15E5U	3	1.0

Rotax Engines with Intake Silencer

-NOTE-
I personally do not recommend the use of the intake silencer
it reduces horsepower and is generally ineffective in noise reduction ! !

Engine Type	Main Jet	Idler Jet	Needle Jet	Jet Needle	Clip	Airscrew
Rotax 277	140	45	2.72	8L2	2	1.0
Rotax 377	155	45	2.70	8O2	2	0.5
Rotax 447	155	45	2.70	15K2	2	0.5
Rotax 447 DC	128	50	2.68	15K2	2	1.0
Rotax 503 SC UP to Serial #3785371	158	45	2.74	6H2	3	0.5
Rotax 503 SC After Serial #3785372	165	45	2.70	15K2	3	0.5
Rotax 503 DC	148	45	2.68	11K2	2	1.0
Rotax 532 SC	170	55	2.74	15K2	3	1.0
Rotax 532/582 DC	145	55	2.68	15K2	3	1.0
Rotax 618 DC	135	55	2.70	15E5U	3	1.0

Bing Correction Chart

How to Use the Bing Main Jet Correction Chart

Step #1 - Assume Nothing!!! (ASSUME-makes an ASS out of U and ME) -Disassemble and check your carburetor(s) to verify the recommended jetting listed in the recommended Bing jetting chart is installed in your Carb(s). This is the most up to date information available at the time of this publication.

Step #2 - Because air density varies with temperature and altitude changes, a main jet correction may be necessary. This chart was calculated at sea level with an air temperature of 60F or 15C.

Step #3 - Apply the multiplication factor shown to the main jet size recommended in the chart at the top of the page.

Step #4 - Your operating conditions will vary by the change of seasons. If your EGT T temps vary and your engine experiences performance difficulties, a review of your jetting may be necessary. Return to step #2.

Step #5 - Humidity is also a variable in determining air density. A high humidity means a lower air density of air to be consumed by combustion. Because we are generally not equipped with a way of easily reading the % of humidity present, this can be read in to this chart by adding altitude on high humidity days and subtracting altitude on in very dry climates. An EGT gauge should illustrate changes in these conditions under lull throttle readings.

Main Jet Correction Chart
Example: 160 x 0.89= 142 Main Jet

Altitude - Meters	0m	500m	1000	1500	2000	2500	3000	3500	4000
- Feet	0'	1500'	3000'	4500'	6000'	7500'	9000'	10500'	12000'
Temperature
-22F -30C	1.04	1.03	1.01	1.00	0.98	0.97	0.95	0.94	0.93
-4F -20C	1.03	1.02	1.00	0.99	0.97	0.96	0.95	0.93	0.92
14F -10C	1.02	1.01	0.99	0.98	0.96	0.95	0.94	0.92	0.91
32F 0C	1.01	1.00	0.98	0.97	0.95	0.94	0.93	0.91	0.90
50F 10C	1.00	0.99	0.97	0.96	0.95	0.93	0.91	0.90	0.88
59F 15C	1.00	0.99	0.97	0.96	0.94	0.93	0.92	0.90	0.88
68F 20C	1.00	0.98	0.97	0.95	0.94	0.93	0.91	0.90	0.88
86F 30C	0.99	0.97	0.96	0.94	0.93	0.92	0.90	0.89	0.88
104F 40C	0.98	0.96	0.95	0.94	0.92	0.91	0.90	0.88	0.87
123F 50C	0.97	0.96	0.94	0.93	0.92	0.90	0.89	0.88	0.86

Note:
Before operating the engine again at lower altitudes, reinstallation of the original jetting is necessary or engine damage or failure may occur!

BING MAIN JETS
The main jets on the Bing carb are replaceable. It is recommended that they be replaced if they are found to be plugged. This can happen when the carb is left with fuel in it for long periods of time. The fuel turns to sludge which plugs the jet. In this situation it is NOT recommended that the jet be cleaned and reused. Main jets start at #120 increasing in increments of 5 to #220 - exceptions are #142/148/152/158/162

BING IDLER JETS
The idler jets on the Bing carb are replaceable. It is recommended that they be replaced if they are found to be plugged. this can happen when the carb is left with fuel in it for long periods of time. The fuel turns to sludge which plugs the jet. In this situation it is NOT recommended that the jet be cleaned and reused.

Idler jets start at #30 and increase in increments of 5 to #70

Note on the 582 and 503 DUAL carb Rotax engines we have found that a decrease in the idler jet size provides a smoother engine idle.

Bing Needle Jet
We have found that on the 582 Rotax switching to a larger needle jet helps prevent hot spots in the engine between 5200 and 5800 rpm. It also helps prevent engine surging in the same range on the 532 Rotax.

Bing Jet needle

The jet needle and clip should be inspected on a regular basis for wear. Wear occurs in the area where the clip rides. Failure of the clip and or needle will cause the needle to:
A) lower itself causing a LEANER fuel mixture or

B) the needle will fall down into the bottom of the carb causing loss of power.
C) cause erratic engine performance as the needle bounces up and down.

Needle clip part # 963 500 (3)

Bing Carb advisory - needle and clip failure!
Click on diagram for larger view of parts.

1 2 3 4 5 6 7 8 9 10 Index for this section.

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