What Causes Grubscrew Issues in the Grasshopper 2 with a 380 Sport Tuned Motor?

The Grasshopper II (GH2) likes to kick out grubscrews from that required Lunchbox pinion gear when upgrading the stock silver can 380 motor to a speedy 380 sport tuned motor. But why? The original Grasshopper (GH1) doesn't have this have issue. We dig into why this happens and possible fixes beyond threadlock.