I have two very low time x3 since I just did not like how they flew in stock form. I ended up stretching both to 380 and did like how they flew then. Still in the end they sat collecting dust because I have many other helis I like to fly instead of the X3. After the G420 came out I decided to stretch one to use the 420 blades.
I ordered the X3L frame set, 3226-1600kv motor, & 13T pinion. I also ordered the upgrade spindle and a CF boom from ACP composite. For now I installed a 591MXL belt which is just long enough to go with 62-68mm tail blades. I have some slightly longer belts coming. For now I used my spare D380 tail push rod on it. Which turn out to be the perfect length with the 591MXL belt installed.
I installed the motor tonight but still need to mount ESC back on heli and check over setup on heli. The motor is a heavy one. I weighed it with HW 50A esc tonight and heli weighed 1008 grams without battery. Still not sure which ESC I will use. I doubt I will use the HW50a. It will either be the HW 60A or 80A.