Tuning up a lawn mower engine before spring
By My Yard Editorial Team · 7/28/2026
The Quick Answer
A full tune-up is oil change, new spark plug, new air filter, sharpened blade, and fresh fuel — about $25 in parts and 30 minutes. It prevents roughly 80% of mid-season breakdowns.
The Witty Breakdown
Old oil is the silent killer. Small engines hold less than a quart, so contamination concentrates fast.
Do it in March, not in May when the grass is already ankle-high and the shop has a three-week backlog.
Step-by-Step Fix
- 1
Drain the old oil warm and refill with SAE 30 or the manual's spec.
- 2
Replace the spark plug and gap it per the manual.
- 3
Clean or replace the air filter and clear the cooling fins.
- 4
Sharpen and balance the blade, then add fresh stabilized fuel.
Pro-Tip / Do Not Do This
Don't skip the air filter because 'it looks fine.' A clogged filter runs the engine rich and washes oil off the cylinder walls.
Was this helpful?
Related Guides
Community Comments
No comments yet — be the first neighbor to weigh in.