I recently purchased a 2005 Yamaha 50 and had it converted to a tiller. Sometimes when the motor is hot, it never does it when it's cold, I turn the key and nothing happens. If I hold the key to start and slowly move the shifter from drive back into neutral it will start. I believe it is the neutral safety switch. Is there any way to test if this is the problem? Also is there any way to bypass the switch?