All winter with the new silicon heater my PT-422 would start right up. Lately in 70 to 90 degree weather forget it. I refuse to use starting fluid, tired of setting valves and changing plugs. Decided not to buy a new PT-425 for the sole reason I do not like these Robin Subaru engines. Put a Kohler in it. I'll buy one today. Just sick of all the headaches associated with engine.