<VV> Carb metering-jet question

[Sethracer at aol.com]

In a message dated 5/4/2008 10:29:53 PM Pacific Daylight Time,  
nicolcs at aol.com writes:

Bill  asked:
Hi all...Can anyone tell me if the main metering jet in the 110  carburetor
is used for both the idle circuit as well as the  main(cruising-high speed)
circuit? 

Craig sez:
Yes, but the size  doesn't really affect things.  All the fuel to run the
engine comes  from the "main well" under the venturi cluster.  The main well
gets  filled from the main jet in the bottom of the bowl but any size main
jet  flows the required fuel without posing much  restriction. 


 
 
Craig speaks the truth. There are a couple of other factors. The float  level 
matters to the fuel-air ratio as well, at least off idle. Since the  mixture 
is pulled by the feed into the venturi, the fuel level on the tube at  the 
bottom of the cluster determines how much fuel vs. air gets pulled in.  Raising 
the float level will richen the mixture. Not much, but it also assures  enough 
fuel under cornering. Also, when the high speed enrichment circuit kicks  in, 
fuel is added to the well through the fixed orifice, in addition to the main  
jet. So the selection of the main jet doesn't much effect on the idle mixture, 
 but after the motor comes off idle, it matters. -  Seth 



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