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Lance Workman

Ozark 250 Carb Question

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Does any have picture BS29 carb from a Ozark 250 they could send me. I need a pic of inside the bowl, carb side. Looking at the jet. I think something has drilled into that brass plug but wanna verify.

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Drilled into the carb or on the bottom side of the carburetor to expose the air/fuel screw? 
Or the actual inside of the bowl where the main jet is ? 
 

It's common to find the bottom of the carburetor drilled out where the air/fuel screw is. Certain states mandate that the screw be factory set and covered for emissions reasons.  

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Well its running, but It only runs with mixture screw set at 3 turns out. Runs with only choke til it’s completely warmed up, then runs fine without the choke. Seems like it takes forever before I can let the choke off. Wondering if the valves need adjusted?

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Posted (edited)

That is correct and although not really a good job its ok.  A bigger drill bit i would have used.   Anyway under that brass cap is your air fuel screw.  
 

Edited by Frank Angerano

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I pullled the carb again in fustration, double checked all passages etc. Put it back together and it runs but at idle it has occasional back firing through carb. I set idle screw at 2 1/2 to 3/4 turns. Also have to make out idle knob. Files fine and  revs fine, even has power riding it, just keeps popping in the intake?!?!

 

I think your seeing that wrong, that is the bowl. The idle air screw is on the left side of the carb

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Im not seeing anything wrong.  Post some some pics and we will explain what's whats what.  Have you looked in that hole thats drilled??????

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Yea it looks like someone started and then stopped drilling, almost like they thought it was the idle mixture and then realized it wasn’t. I’m still having the same issue, it’ll crank and idle. I have the idle mixture set but have to crank the idle adjuster all the way down to idle, and has a pop in the air box and sometimes will just die. Ha plenty of power and runs out fine, but I can’t for the life of me figure out why it’s popping and occasionally dieing!!! I check valve clearance and intake is a little on the high side around 0.005-0.006 but I don’t think that would cause it? Will adjust when I find my correct feeler gauges. I just bent a 0.007 and I can cram it in there. So I know it’s larger than tolerance allows. 

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That plug is the main jet. If the jet isn’t seated on properly it will allow gas into the carb causing your backfire. Fix that jet. Your float can be right but even with the float closed. It will still dump gas in. Close the float while it’s apart. Hook an air line to the carb and blow into it. If not. Look into the float. Improper float heights and bad seat gaskets will cause it too.


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