Originally Posted by
elex300
The purple rotor is 12.3mm and more suited for onroad. Im sure your R1 has a 12.5mm rotor in it which is why you feel it performs better. However I bet if you put the 12.5mm rotor in the D4 you will be very happy. This motor is a torque monster like the D3.5 was but runs way cooler. The difference bewteen 12.3mm and 12.5mm sounds very minuscule but its a huge difference in performance especially in offroad.
Yes, u are right. So I need to spend another 40bucks or 60 for the certified one to make this motor $150-160 stock motor to compete with my others. See where that kinda sucks. No one said this is a cheap hobbie. Ha
ill just run it in my Mi5