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hi i just replaced the carb on my mower. when i start mowing it sputters. so i took off the little black cap that covers the fuel jet and turned the screw just alittle and it ran alot better. but then the screw unscrewed its self from the vibration how do you keep this screw from unscrewing its self? tecumseh engine model # is ovrm120 and the new carb # 640338

Please post the model and spec numbers for your engine so we have a better idea of what you are dealing with.

fordguy2001 said:

how do you keep this screw from unscrewing its self?

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When i come across that, I wrap the mix screw with pipe thread tape. Make sure not to wrap the tip but only the threads.

upupandaway said:

When i come across that, I wrap the mix screw with pipe thread tape. Make sure not to wrap the tip but only the threads.

Orbit 1/2 in. x 520 in. Thread Seal Tape-31273 - The Home Depot

Use the 1/2 in. x 520 in. Thread Seal Tape to seal threaded joints on metal or plastic pipe fittings. This tape is made to wrap around threading to help create a watertight barrier.

www.homedepot.com

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thanks i'll have to try it

That is not an adjustable part. it is a fixed idle jet screw. If unscrewing it a little resolves the problem then the jet need slightly enlarging but yu must be very careful as to not over size it.