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Bing Carbs shaking problem solved.

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Jim Shumaker

Joined: 09 Jan 2006
Posts: 106

Posted: Sun Mar 04, 2007 9:21 pm Post subject: Bing Carbs shaking problem solved.

This is a new post for general information and is not a reponse to previous posts, even though the problem may be the same or similar.

  

 I have been having a problem with my carbs spitting fuel out the overflows during idle.   I had replaced the needles, needle jets, fuel needle and the fuel needle seat.  New diaphrams, hoses floats and pressure regulators.  As well as float lever and axle.  

  

 Every time I would replace some part and adjust cables, needle valves or clean orfices or change pressures the problem seemed to be solved and then the next time the engine was started it would run terrible.

  

 Nothing helped.  The Bing dealer was helpful.  They guided me in the right direction or confirmed my settings and procedures when I called.   When I had tried every thing they told me to set, they said that the overflow was from the running rough at idle causing the floats to allow the float needle to unseat and causeing the fuel to spash out the overflow.  They were right, but My experiance seemed to be that the rough running was caused by the overflow rather than the other way around.

  

 One of the changes I had made when adjusting the pressure regulator to limit the pressure to the fuel needle seat was to lower the jet needle circlip which richened the mixture (but only in the midrange - I thought).  My logic for making this change was faulty, so we will not go into that now.

  

 When I moved the needle jet circlip back to the Factory setting of the second groove down from the top, the shaking during idle settled down to nearly nothing.  A little bit of fine tuning and the engine is now running better than it ever has at idle.

  

 So....what was happening is that when the jet needle was raised in the main jet it richened the mixture so much that the engine missed and ran rough and caused the floats to unport and  allow extra fuel in which raised the fuel level and richened the mixture and made the engine miss and run rough and on and on.  When the mixture did not make the engine run too rough the idle could be set and all seemed ok.  But then once the engine started flooding from being too rich the problem fed on itself and the engine ran terrible.  

  

 Hope this is helpful to someone.

  

 Jim Shumaker

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Jim Shumaker

torgemor(at)online.no
Guest

Posted: Sun Mar 11, 2007 2:54 pm Post subject: Bing Carbs shaking problem solved.

Hi James,



This is indeed a good example of "experimental spirit", a real keeper.



I know lot's of people need to read about this way of adjustment!



Just another good one.



Thanks.



Torgeir.



On Mon, 05 Mar 2007 06:21:07 +0100, James Shumaker  

<jimshumaker(at)sbcglobal.net> wrote:



 	  Quote: 	
		   This is a new post for general information and is not a reponse to  

 previous posts, even though the problem may be the same or similar.



 I have been having a problem with my carbs spitting fuel out the  

 overflows during idle.   I had replaced the needles, needle jets, fuel  

 needle and the fuel needle seat.  New diaphrams, hoses floats and  

 pressure regulators.  As well as float lever and axle.



 Every time I would replace some part and adjust cables, needle valves or  

 clean orfices or change pressures the problem seemed to be solved and  

 then the next time the engine was started it would run terrible.



 Nothing helped.  The Bing dealer was helpful.  They guided me in the  

 right direction or confirmed my settings and procedures when I called.    

 When I had tried every thing they told me to set, they said that the  

 overflow was from the running rough at idle causing the floats to allow  

 the float needle to unseat and causeing the fuel to spash out the  

 overflow.  They were right, but My experiance seemed to be that the  

 rough running was caused by the overflow rather than the other way  

 around.



 One of the changes I had made when adjusting the pressure regulator to  

 limit the pressure to the fuel needle seat was to lower the jet needle  

 circlip which richened the mixture (but only in the midrange - I  

 thought).  My logic for making this change was faulty, so we will not go  

 into that now.



 When I moved the needle jet circlip back to the Factory setting of the  

 second groove down from the top, the shaking during idle settled down to  

 nearly nothing.  A little bit of fine tuning and the engine is now  

 running better than it ever has at idle.



 So....what was happening is that when the jet needle was raised in the  

 main jet it richened the mixture so much that the engine missed and ran  

 rough and caused the floats to unport and  allow extra fuel in which  

 raised the fuel level and richened the mixture and made the engine miss  

 and run rough and on and on.  When the mixture did not make the engine  

 run too rough the idle could be set and all seemed ok.  But then once  

 the engine started flooding from being too rich the problem fed on  

 itself and the engine ran terrible.



 Hope this is helpful to someone.



 Jim Shumaker


	


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Jim Shumaker

Joined: 09 Jan 2006
Posts: 106

Posted: Sun Mar 11, 2007 9:10 pm Post subject: Bing Carbs shaking problem solved.

Thankyou for the flowers Torgier.

  

 But to top off all that sweat, I went for a test flight yesterday, intending to fly about 140 miles for the $100 hambuger.  Got about 10 miles out and the engine started missing.  Just light shudders first and then slowly more persistant...and then shudders that made me back off the throttle and ease it back to the airport.  Happily accepted a short and straight in approach to the nearest runway even though it was downwind.  The question last night was how to part out the airplane. 

  

 This morning a check of the engine revealed the problem.  A spark plug with a broken porcelean.  New set of plugs and all is well again.  I'd fire my lousy mechanic...but I work too cheap.

  

 Jim Shumaker

 ---

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Jim Shumaker

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