With a lot of research already under my belt, and numerous times pulling the carb off and “doing” things.  I was still going off of supposed data.  The only thing I really knew was that it was a 3414, and it had a zenith 33, with a 24mm venturi.  So what?  What engine does it have?

I’m not sure why this had been a barrier for me as it was as simple as walking down to the backhoe and looking.  So I found a small plaque covered in grease near the bottom of the engine with stamped characters in it.  “BC-144”.  I no longer had to wonder.  I took a sigh of relief and brought up a google search for “BC-144 Specs” or some such thing and found the same manual I’d referred to earlier to find the 30vnn and 30vnp information.  zenith carb venturi number 24

There it was, 22mm venturi size.  So mine was different.  EUREKA!

The Unknown

but…if it’s suppose to be 22mm, and mine is 24, would that mean it’s currently getting “more” air than a 22 would provide?

I don’t actually know the answer to that question.  I’ve supposed that that could be the case, but I’ve also supposed that perhaps a small venturi would speed air up and give it more per measure quantity.  meh.  I don’t know.  I’m happy to start a comment frenzy with this.

The Known

My goal is to probably buy a new zenith 33 with a 22mm and try that.  The reason is that this carb may have something else wrong with it. Zenith 33 homemade carb gasket I see that a couple of the rods are bent a little ( the ones that stick down into the bowl, or up into the head).  I even made my own gasket for it because at the time I didn’t know anything about it and just wanted to fix all the air leaks.  Check this beauty out? Maybe it’s got the wrong jets? Needles?  Who knows.  The point is, if I buy a new one, I will be the one to “know” what exactly it has.



BC-144 Engine
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