Finally gave in and bought a zenith for my 2000. Seems to run rich and sputters. Only adjustments I can see are idle speed and mixture screw. Adjusting screw seems to do nothing. Am I missing another adjust somewhere? Thanks
 
I am currently waiting on a similar carb for my 3000. As far as I know there is only the idle mix screw that would cause any lean or rich mixture. Sounds like maybe your timing might be off slightly.
 
I did forget to mention gas seems to be dripping out of the weephole as well. Seems odd for new carb. Wonder if the float or need could be stuck
 
What I've noticed is that some after market vendors sell one carburetor part number for the 2,3,4000 three cylinders. There actually six different Zenith part numbers for the differing Holley numbers used on those machines. If there is enough interest I can post the cross reference cheat sheet I made up years ago.
 
P.S. is your new Zenith actually a Zenith, or a Large East Asian Country reverse engineered knock off?
 
Yeah I wouldn?t mind seeing the cross reference sheet if you have it. Should be a real zenith, question is if it?s the right one. The carb that was on there was a Holley 12R-3589B
 
New carbs are not tested or adjusted regardless of brand.
At least, none that I know of are. That's on the purchaser.

Dripping out the "weep hole" means it is flooding, as you know.
That could be a stuck open needle valve, floats out of alignment/
adjustment, seat not tight or gasket missing, etc.

You could send it back if you want the warranty to be good.
Or you could take it apart and inspect/repair as needed which
may void the warranty if there was one.
 
I guess that?s the big question...do I tear into it and find
something that needs repaired that is out of my hands and
then the warrently is void or do I play it safe and send it back.
This is the second zenith carbureator I bought from Steiner,
the first one was for my 4000 and I actually didn?t have to
adjust it at all when I installed it, except for the idle speed.
 
OK, I'll contact the moderator here and find out how to post a portion of an Excel sheet. Steiners used to source directly from Zenith, but that may have changed if the found somebody to copy it.
 
(quoted from post at 21:46:41 02/16/18) What I've noticed is that some after market vendors sell one carburetor part number for the 2,3,4000 three cylinders. There actually six different Zenith part numbers for the differing Holley numbers used on those machines. If there is enough interest I can post the cross reference cheat sheet I made up years ago.

I'll third the request to post a cross reference sheet. I just pulled a R3589 that was acting badly off of a 4000.

Looks like it should have been a R 3567????
 

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