While the grass is growing ,it would be a good idea to not only check the value of your piston as this is a quick and simple procedure and while you have the muffler off give it a good clean and take out as much carbon as you can. I like to soak the muffler in a bucket overnight and then blow out with the compressor and also check that the muffler screen is clear. Also good to clean the exhaust port clear of carbon by scraping it carefully and making sure no carbon goes back in the engine. Also check your spark plug as sometimes it's the simple things can trip you. Good luck matey.
