I have had my Tong Sheng TSDZ2 for about a year now. During that time I have probably put about 2000 miles on the motor. The motor is working great and I hope to keep it that way. Is there any maintenance that I should be doing, such as cleaning and greasing, to this motor and and at what intervals? Other than the blue gear should I keep any spare parts handy? I have done a bit of searching and have not had much luck finding any information.