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OS52FS Idle Adjust

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Old 10-04-2012, 11:00 AM
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Default OS52FS Idle Adjust

Bax,

My OS52FS, 40N Carb, was running superbly until a hard landing in the weeds.
Now it won't transition from low to high.
The pinch test indicates the low end is to lean, dies instantly.
I am guessing something is clogging the air bleed hole.
I can't find the air bleed; where does the low end air enter the carb?

The diagram I have found does not indicate the low end adjustment
screw or the air intake.
[link]http://downloads.hobbico.com/evpl/osm/ev44281000.pdf[/link]

Thanks for your help,
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Old 10-05-2012, 06:03 AM
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Default RE: OS52FS Idle Adjust

There is no airbleed hole. The carburetor for your engine does not use an airbleed hole for idle mixture adjustment. There is a small screw next to the needle valve where you adjust the idle mixture. The air enters the carburetor through the venturi. On the exploded diagram of the carburetor, part #4, nozzle assembly, has the idle mixture adjustment.

If the engine won't transition from low to high, you'll need to check the entire fuel system to make sure it's OK, and then get the engine properly set. If a fuel passage has gotten something into it, then you'll have to clean the carb.
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Old 10-05-2012, 06:10 AM
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Default RE: OS52FS Idle Adjust

Bax,
Thanks!
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