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Discussion Starter · #1 ·
I'm having a problem adjusting the carb on a BF-MS engine.

I can't fully adjust the main adjustment without it leaking fuel out of the screw, now in referencing the service doc (I'm learning!), it appears that I'm missing a very small O ring on the adjustment screw. Were can I get another other than purchasing a entire carb service kit?

Also but not near aas a issue, the idle screw does not effect the idle, with it fully in no effect, 1 1/4 out and it's still no effect on any aspect of how the engine runs at idle but the engine seems to run fine at idle with no missing or stuttering.
 

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I am not a pro, but from past post and my own work on carbs it sounds like it has a hunk of dirt in it and needs a good cleaning. The adjuster screw may have the end broke- off inside not allowing any productive adjustment. I would start by a deep carb soaking and clean it out. Make sure to change the fuel filter or install one after cleaning carb. I would check all the fuel hose for cracks and leaks and replace if old and brittle from tank to fuel pump to carb. Im sorry i dont know what you can do about the missing o ring unless you ask a case dealer with a part number? Good luck ! :trink:
 

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Discussion Starter · #4 ·
Donkman said:
If you have a Harbor Freight near you , they have all kinds of O-ring assortment kits.
even one that small?

I'm almost sure the issue is that the O ring is missing, I have a China Freight store locally so I will give it a shot.

Just got done soaking and cleaning this carb too. Me and carbs do not get along well, we generally agree to disagree and that I leave them alone and they leave me alone.
 

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Discussion Starter · #5 ·
They did have box assortment, didn't help so I guess I going to pull the carb off and try cleaning it better.

Is there any more instructions somewere for cleaning it or it as simple as stated? the service manual described it's parts but not any detail on servicing the carb it's self short of soaking it in car cleaner, wash in warm soapy water and then blow dry. Are there any note on the net that are a little more detailed esp for touble shooting?
 

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If you have the gallon pail of carb cleaner that eats the flesh off your fingers :twisted: there are no special procedures needed.

Have you checked for intake leaks at the manifold joints ? New gaskets on the the intake ports ?

More than one poster has reported carb adj problems only to find that the screws were in the wrong hole, yes, it`s a long shot. Are the screws in the proper place ?
 
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