Traxxas 3.3 wont idle.

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given by the information, your LSN is very rich, which would almost cause it to flood out, so you are having to compensate by opening up the idle gap. factory settings are rich settings for break in not running settings, you will have to lean both needles out to get performance and correct running. common signs of loss of compression is flame outs and inability to start the engine while its warm, but once its cold the metals shrink giving it compression to start again. if you want to check to get a better gauge you can pull the piston and sleeve and see how far the piston goes into the sleeve in the correct orientation as if it was installed on the engine. if it goes past the top, its about done for, if its still down in the sleeve, you still have life left.
 
Factory settings are given for a reason and the are not running setting. Nor are they break in settings. (which is what everyone think they are) The factory setting are close to get the motor started if you mess up the settings. 4 turns high is as lean as you should go +1/2 turn open is better to start is better.(the manual doesn't say to go any more?) Low is flush and 1/4+- is all you go. The idle gap is set to 1mm open + 1/4 turn. These factory settings settings work just fine. Loss of compression is cause from leaning out the high too much with not enough oil lube and fuel . This can cause the idle to drop and opening it is the remedy. The OP has gone past the recommended high settings and has high idle from the cause of lean running. Once engine warms up the compression is lost with the factory idle setting and opening it is the only option. The OP has set the carb back to factory settings except for the idle which is higher and it runs fine.

A slightly rich engine is better than a slightly lean engine.
 
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