Went to collect my free Wolvie from Valentina (yeah, having to start a fresh career to avoid issues with older saves). YAML strips everything from the mech bar jump jets.

Worthy of mention: YAML was causing crashes when travelling on the starmap after finishing the initial DeBerry missions; had much fun disabling and re-enabling mods to find the culprit. Eventually just travelled to Valentina without YAML installed (worked fine), then activated YAML, at which point after collecting the mech it stripped all the parts and didn't add the YAML variants. Now, while not "game breaking" it's a pain since I'd have to rebuild the Wolvie II at c-bills cost to myself.

Not certain if the issue will be present with other new mechs as yet; haven't done the Pascagoula mission to progress the story. Am also running the YAW and YAWC mods. All are current (v4).