You need to jump out the start switch/relay as I suggested and check the voltage there as well, should be around 120vac. Thermal fuse is not in the motor circuit. Normal for ignitor to cut off after it gets hot and flame sensor opens.

Eric

That is the centrifugal mechanism that operates the motor switch. When the motor starts spinning, the weight of the spinning mechanism pulls it in and operates the two switch contacts inside the motor wiring receptacle. One contact opens the start winding circuit and the other completes the neutral circuit to the gas valves. When the motor stops, the springs force the mechanism back to original position. It is common for the tabs that the spring connects to, to fail. The stainless steel spring loops wear through the aluminum tabs. The only option is to replace the motor. I'm not sure that is your problem though. The motor does start and the ignitor glows so the motor switch appears to be working properly. The springs have no function once motor is running. They are only there to bring the switch back to starting position after motor stops. If you lost both springs, the mechanism would stay in the run position and the motor would not start. It may be that the start winding switch contacts are stuck closed which would cause excessive current after motor has started and trip the thermal overload. Either way, you need to replace the motor.

http://www.appliancepartspros.c...or-279827-ap3094245.html

Eric