You can put a thin washer between the spring and the rubber o-ring to keep the spring from chewing the o-ring up, then clean the threads on the screw with alcohol real good and put a thin strip of green loctite on those threads. Let it dry then put it back in and adjust it. It won't ever move again until you turn it...
Replacement Fuel Screw
The fuel screw on my trx250x is a PITA to adjust and it likes to fall out. For a while, I've used high temperature tape under the carburetor to prevent the screw from rattling out, but I'm just tired of it. I've found a lot of these after market fuel screws for things like CRF150Rs, but I'm not sure it would work for a trx250x (2014). Does anyone know if the aftermarket screw pictured (bottom) would work, or if there is a similar one meant for the trx250x that would work? The original screw is the top one, but I'm sure you all knew that already (it isn't the exact one, but close enough).
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Great knowledge and advice SlammedRanger! Thanks for saving my butt after that bad suggestion! 
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