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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. ✌

I got the right information from the link you provided. It's the TVS90-43745N. THANK YOU SO MUCH!

Got it. Thanks a lot!(y):)

Thank you! For doing a tune up, do I need to clean up the carburetor as well?

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...