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912 needle valves

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Kaufjm(at)aol.com
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Posted: Wed Mar 22, 2006 11:39 am Post subject: 912 needle valves

I have the red tipped needle valves and I can see a slight ring,  close to  

the tip. I do have venting at low RPM. I was told once that if  you can see the 

ring that you should replace the needle valve.

 Any thoughts would be appreciated.

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mike
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Posted: Thu Mar 23, 2006 1:35 pm Post subject: Re: 912 needle valves

My advice is to change them, you will get the black tips from aircraft spruce, also get new pins and arms.  Take some carb spray and inject into the different circuits while doing this, take the idle adjust screws out and spray in there also.  favor the lean side on the float adjustments, put the arms so they go level with the carbs upside down and the up slightly for the lean side.

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Kaufjm(at)aol.com
Guest

Posted: Fri Mar 24, 2006 11:23 pm Post subject: 912 needle valves

Kitfoxmike,

   I am not sure what, "the up slightly for the lean side"  means on the carb 

adjustment.

Also , the arms in the floats should be replace? 

 Thanks, 

 Jon   N153JK IV 1200

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mike
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Posted: Sat Mar 25, 2006 7:52 am Post subject: Re: 912 needle valves

when you turn the carbs over align the arms level to the casting or gasket for the bowl.  then bend them up slightly, maybe 32nd of an inch to the lean side.  this is where the end of the arms will be higher than the start of the arms. hope this makes sense.

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mike
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Posted: Mon Mar 27, 2006 7:33 am Post subject: Re: 912 needle valves

I thought I would pass along something I found on my fox over the weekend.  I removed the covers to replace the spark plugs and do a check over for the annual.  Well, I got to the carbs and there was gas coming out, further inspection found that the idle screw were leaking, sure looked like the vents were leaking.  I pulled the screws and found the orings were shot.  I went to the parts store and put in a standard set, I think 3/32, could be wrong on that.  they were a little fatter and smaller, but once put on, sealed just fine.

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