Not a custom build, i bought a complete bike from the shop, just changed some parts like fork, seatpost, tyres and pedals so far. I added throttle + gear shift sensor and unlocked speed limit plus changed some riding params with Besst Pro.I don’t actually dislike the motor. But i am interested in making some modifications to fix a couple of issues. You have had success with modifications? What did you do and how did you go about doing it? Also is your bike a custom build?