MN MODEL MN90 D90 RC CAR suddenly slows down. How should I troubleshoot the problem?

A: The slowing down of driving speed may be due to the decline in battery performance. You need to replace a high-performance battery. In addition, transmission system failure (such as gear wear, loose chain) or insufficient tire pressure may also cause slowing down. You need to check the transmission system and repair or replace worn parts, and ensure that the tire pressure of the MN MODEL MN90 D90 RC CAR is normal.