Hi, I have a Husqvarna ride on mower with a tecumseh 220 TVM 8 hp engine that will not start. It was running fine a week ago. I have checked to see if there is a spark with the plug out against the engine, whilst pulling the pull start, I couldn't see a spark, but don't suspect the plug as the engine is little used and two years old. It has an ' on/off 'switch. Can a plug just pack in if it looks fine? The mower is quite old, but has a newish engine. Very grateful for any help.