[AT] Small Zenith carb (CA) question please

[John Wilkens]

Thanks Grant!  I will look into the problem area you mention.  I never 
thought of that.    I did check the float and level.  No problem there.   John




At 01:37 PM 06/29/2004, you wrote:

>Hi John,
>
>   I've found that the gasket surfaces on those old Zeniths tend to warp, 
> especially on the top section.  This warpage will not allow the gasket to 
> seat properly and gas will suck into the venturi area from the float bowl 
> when the engine is running.  File the gasket surfaces down flat or sand 
> them flat with some emery glued down to a table.  The gasket is rather 
> thin in the area around the venturi and is subject to leakage.  Also, 
> sometimes the venturi will hold up the top of the carb lid section 
> causing the gasket to not seal.  Bottom line is that sometimes Zeniths 
> are hard to seal around the venturi, and that you have to watch this area 
> or gas will suck in.  Hope this helps!
>
>Grant Weir
>Saskatoon, SK.
>Canada
>
>
>
>>From: John Wilkens <jwilkens at eoni.com>
>>Reply-To: Antique tractor email discussion group 
>><at at lists.antique-tractor.com>
>>To: at at lists.antique-tractor.com
>>Subject: [AT] Small Zenith carb (CA) question please
>>Date: Tue, 29 Jun 2004 11:30:01 -0700
>>
>>The CA is running rich--blowing black smoke.  I put two sizes smaller 
>>main jet in (.24) and set the float level a little lower (float valve is 
>>not leaking) and it still smokes and fouls plugs.      Then I put a 
>>Zenith carb from a Wisconsin engine on it (same size main jet) and it 
>>runs fine--no black smoke--but the linkage is all wrong for use on the 
>>CA.
>>So.........does anyone have a clue as to what might be wrong with the 
>>original carb??  Could someone have drilled some passage way out inside 
>>and messed it up??    If you know of a small carb expert I might contact 
>>with this question please let me know.     John Wilkens
>>
>>                    In the wide-open spaces of NE Oregon
>>
>>
>>
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                    In the wide-open spaces of NE Oregon