my neighbors kid just came home with an older mako with a 1971 evinrude 125 on it. it starts and runs for about 3 minutes then quits like you turned the key off which is why the previous owner got rid of it. it has a new aftermarket power pack ,coil, ignition wires,and distributer cap under the stator on it. I printed out the wiring diagram here on iboats. when it quits it still has power at the terminal strips where it should have with the key on. however at this point it has no spark . if we try the next day it will start and do the same thing. it does need a pump impeller I can tell it is a little weak but the motor never got above 130 degrees. would appreciate any help, thanks....p.s. what does the thermal switch in the top of the block do?
