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Bendix carb tuning

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Old Jun 17, 2011 | 11:01 PM
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Default Bendix carb tuning
I got a 78 with a bendix carb and ultima electronic ignition. I set the jets at 1.5 for slow and 4 out for main to start. I am getting some popping out of the carb from time to time...so its to lean correct. So I gave it some more fuel. I am still getting some pops from carb and the plugs look rich so what am I Doing wrong ? The bike idles good and when I run up thru the gears it seems to run good. Any advice would be great.

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T-Ron
 
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Old Jun 18, 2011 | 07:14 AM
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Bendix carb info here ...

Bendix Carb
 
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Old Jun 18, 2011 | 08:17 PM
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Originally Posted by dirty78ironhead
I got a 78 with a bendix carb and ultima electronic ignition. I set the jets at 1.5 for slow and 4 out for main to start. I am getting some popping out of the carb from time to time...so its to lean correct. So I gave it some more fuel. I am still getting some pops from carb and the plugs look rich so what am I Doing wrong ? The bike idles good and when I run up thru the gears it seems to run good. Any advice would be great.

Thanks
T-Ron
Here is how you tune a Bendix having the adjustable main jet......

Name: BendixCarbfactoryinstruction1of2-1.jpg Views: 8671 Size: 147.1 KB

Name: BendixCarbfactoryinstruction2of2-1.jpg Views: 11324 Size: 148.5 KB

pg
 
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Old Jun 28, 2011 | 10:42 PM
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So I followed all instructions on tuning posted by PG read all of the post here and on the other XL forum recomened form Mick. Still getting a pop out of the carb. Just went for a 300 mile round trip ride and the old sled ran great but would still pop every now and then so what gives? I used to have the fuel line from the petcock dropping down under the carb and then to the inlet never had a pop. Now I have a 90 degree petcock and the fuel line goes almost straight in with the inline filter. Would this make a diff ? Also the clear filter some times is full and sometimes not.

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Old Jun 28, 2011 | 11:22 PM
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Should also say that the pop happens when coming to a stop and I just blip the throttle to down shift are when taking off again just small throttle input.

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T-Ron
 
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Old Jun 28, 2011 | 11:22 PM
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A pop tells me there is still an air leak.
The position of the petcock makes no difference.
Air bubbles in the clear line mean nothing. Quite normal.
After a 300 mile ride you may want to check the pushrod clearance again. Do this with a stone cold engine.
pg
 
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Old Jun 29, 2011 | 06:21 AM
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Originally Posted by dirty78ironhead
... and the fuel line goes almost straight in with the inline filter ...
Do you have both a petcock filter inside the fuel tank and the in-line filter? If so remove one of them. There have been many instances of fuel flow being restricted when using two fuel filters.

Also, is the in-line filter a motorcycle specific filter, and is it designed specifically for gravity flow? There have been many instances of fuel flow being restricted when using an automotive fuel filter designed for vehicles with a fuel pump.
 
Last edited by IronMick; Jun 29, 2011 at 06:24 AM.
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Old Oct 21, 2019 | 06:01 AM
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Default Pop through carburetor
To check for manifold leaks remove spark plug and screw in a hose to attach an air compressor, block carburetor filter end and pressurize slightly., now spray manifold joints and carburetor with soap and water to find vacuum leaks.Float setting and action is crital .
 
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Old Oct 22, 2019 | 06:18 AM
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The above post contains much incorrect advice. To check for manifold leaks, read the following thread before considering the advice given in the above post...
http://xlforum.net/forums/showthread.php?t=2074920
 
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