Bought this Honda 100 model B100S S/N1300635. It started right up and runs good. Can I check the rpm's on the pulley that has the belt on the top front of the motor? I would use a dial gauge with a rubber tip that you hold on the end of the shaft. Does that shaft run at true engine rpm? It sounds as if it is running to fast what is top rpm's? Also there is a rubber plug on the left side on the motor, when you pull it off there is like a 120 volt plug with one shaft at right angle to the other. What is its use? What oil or grease is used in l/u. Thanks