Thank you so much for your great suggestions. I definitely will give a try. To be honest, I almost know nothing about machine. It is my first time to do such kind of thing. Hopefully everything will go smoothly. ✌
Thank you so much! Now I know it is a Tecumseh 3.5 HP engine. It's my fault to ask a wrong question about the cylinder (I have no idea on an engine). Actually I want to know it is a 4 cycle engine or 2 cycle one.
I checked the link you provided and I couldn't find the same model.
I got a used Champion Vantage 20" 3.5hp ( AYP Model AT103ZA) rotary lawn mower few years ago. It worked fine. But recently it's getting harder to start. I want to do a tune-up for it such as changing oil, spark plug, air filter etc. But I couldn't find the manual and I don't know it is a 4 cycle...