I need a Parts Manual with a blow up of the engine compartment and drive train for a JD 170. It is an old one but this is the first time I have ever had any problems with it. It has failed to start. Using a 12volt test light, I'm getting voltage (I guess 12 volts) to the coil and down thru the spark plug wire but it is not firing thru the spark plug. How much voltage I don't know. Any help will be greatly appreciated. Thank You. GE