Back in the 1980s, industrial arts classes were common in every high school in America. One of the standout offerings was the Small Gas Engine class. This hands-on course taught students not only how engines work but also how to maintain and repair them. It was a perfect blend of theory and practical application, giving young students a solid foundation in mechanical principles that are still relevant today.
In the classroom, students would learn about the internal combustion cycle, ignition systems, carburetors, and engine timing. But it was the shop where the magic happened. Students would roll up their sleeves and tear down lawn mower engines, troubleshoot problems, replace parts, and bring them roaring back to life. It wasn’t just about fixing engines—it was about learning how things work and gaining confidence in your own two hands.
Today many homeowners have small gas engines so the need for those skills hasn’t gone away. In fact, they’re more valuable than ever. If you’re looking for a way to get started learning this skill, there is a simple, satisfying project waiting for you right in your garage: your lawn mower.
A Lawn Mower Tune-Up: Your Gateway to Small Engine Skills
Tuning up your lawn mower is a great introduction to small engine maintenance. It’s a hands-on job that teaches you essential skills—and gives you immediate results. You will need a socket set and spark plug socket to correctly remove the spark plug, unless your engine came with a tool to remove the spark plug.
Here’s a basic checklist to get started:
1. Change the Oil
Drain the old oil and replace it with fresh, manufacturer-recommended oil. This keeps your engine lubricated and running smoothly.
2. Replace the Filters
- Air Filter: A clogged air filter chokes your engine. A clean one improves performance and fuel efficiency.
- Fuel Filter (if equipped): Replacing this ensures clean fuel reaches the carburetor.
- Oil Filter (if equipped): This keeps your engine oil clean and extends engine life.
3. Replace the Spark Plug
A fresh spark plug ensures a clean, strong spark—key to reliable starting and efficient combustion. Learn how to set the spark plug gap. Check online for the gap for your particular engine. If you cannot find the gap for your particular engine then use .030.
4. Grease Any Fittings
Lubricating moving parts like wheels and linkages reduces wear and tear. Check your owner’s manual for grease fitting locations.
5. Sharpen the Blades
A sharp blade cuts cleaner and faster. Dull blades tear the grass and stress the engine. Use a file or grinder, and if possible balance the blade afterward.