Incorrect gear mesh with the center driveshaft. Solution: The V2 requires a specific mesh gap of 0.2mm. Use a piece of notebook paper between the input gear and the bevel gear. Tighten, then remove the paper. You should feel a slight tick.
If you manage to acquire a clean copy of the Mugen V2 GKP (Rev.2), here is how to survive your first lap: Mugen V2 Gkp
You have the kit. Now, how do you assemble it for maximum performance? Follow this step-by-step guide. Incorrect gear mesh with the center driveshaft
Beware of counterfeit parts. The RC market is flooded with "compatible" knockoffs that use soft metal. To ensure you get the genuine , purchase from: Tighten, then remove the paper
The "V2" version typically represents an optimized iteration over standard layouts, focusing on: Multi-Button Layouts