Yep, new parts doesn't always mean working parts. New coil could be defective. If she still has good spark after dying, do as above have stated. also possible the valve clearances are too tight, then after warming they will close the gap even more as valves expand, so valves could be held just a tiny tick open after getting to full temps.NUTNDUN said:Can you check to see if you still have spark after it warms up and shuts off on it's own? If it still has spark after it shuts off on it's own then you can basically rule out the electronic side of things. I would check the vent for the fuel tank next if it has spark after shutting off on it's own.