Should you repair or replace your lawn mower?
Updated August 2026
← Every repair-or-replace call
Repair a lawn mower as long as the engine still has compression and the fault is fuel, ignition, or a wear part; replace it once the deck rusts through, the engine burns oil, or the quote passes half the price of a new machine. Most no-start calls trace to stale fuel and a gummed carburetor, and that is a $20–60 cleaning or rebuild kit. Blades, belts, and drive cables sit in the same cheap tier. Set the line at roughly $150 for a push mower: below it, fix almost anything; above it, weigh the repair against $250–600 for a new push mower or $1,800–4,000 for a rider.
The short version
Two questions settle it, and neither needs a mechanic. First, does the engine have compression and hold its oil? A four-stroke that pulls hard, fires, and does not smoke is the expensive half of the mower, and everything bolted to it is cheap by comparison. Second, is the deck sound? Rust that has eaten through cannot be patched safely, because that steel is what contains a blade spinning near 3,000 rpm. Put the 50% rule on top of those answers. A push mower rated for 8–10 years is not worth a $200 shop bill in year nine, while the same repair on a 10–15 year rider that costs $1,800–4,000 to replace is easy money.
Your situation, decided
| Situation | Verdict | Why |
|---|---|---|
| Will not start after storage, engine turns freely | Repair | Stale fuel and a gummed carburetor, a $20–60 clean or kit |
| Dull or bent blade, worn belt, or broken drive cable | Repair | Wear parts at $15–80 each, nowhere near a new mower |
| Push mower past 8 years, shop quote over $150 | Replace | Half the price of a $250–600 mower on a machine near its end |
| Engine smokes blue and burns oil between mows | Replace | Worn rings or cylinder; the rebuild costs more than the mower |
| Deck rusted through or cracked around a spindle | Replace | A structural part that contains the blade, not a safe patch |
| Rider at 8–12 years facing a $400–900 transmission fix | Judgment call | Weigh it against $1,800–4,000 for a new rider |
What each path costs
Repairs typically run $20–150; a replacement is $250–600 push, $1,800–4,000 rider installed. A push mower lasts 8–10 years and a rider 10–15. Repair freely while the engine holds compression; a rusted deck or an oil-burning engine ends it at any age. Price your own number on the home maintenance cost calculator before you commit either way.
The repair-or-replace call is easy when you know the unit's age and service history. OnOtto keeps both, plus the maintenance that delays this decision for years.
Start your home's service log, freeFrequently asked questions
My mower will not start after sitting all winter. Is that expensive?
Rarely. Gasoline with ethanol starts breaking down in about 30 days, and the varnish it leaves plugs the tiny jets in the carburetor. A cleaning costs $20–60 in parts if you do it yourself, or $60–120 at a small-engine shop, and a fresh spark plug is another $5–10. Drain or stabilize the fuel each fall and this failure mostly disappears; the routine is in our guide to winterizing a mower. A spring no-start is almost never a reason to buy a machine.
Is a self-propelled drive that quit worth fixing?
Usually. The drive belt, the transmission cable, and the wheel gears are the three suspects, and parts run $15–80 with an hour of labor if a shop does it. That sits under the $150 line on a $250–600 mower. The exception is a mower already past eight years with a tired engine, where the drive is one of several bills queuing up behind it. In that case push it by hand for the season and put the money toward the replacement.
When does a riding mower stop being worth repairing?
When the engine or the transmission goes on a machine past 10 years. Riders last 10–15 years, and their routine parts stay reasonable: belts, blades, spindles, and batteries run $50–300. A hydrostatic transmission rebuild at $400–900 or a short block at $700–1,500 is different arithmetic against $1,800–4,000 for a new rider. Deck rust decides borderline cases. Once the deck is perforated around the spindles it can no longer hold the blades safely, and a replacement deck often costs more than the mower is worth.
Does routine service really keep a mower out of the shop?
It prevents the exact failures that fill repair benches. Old oil, a dull blade, and a fouled plug account for most of the tickets a small-engine shop writes. An annual oil change costs about $10 in oil, a new plug $5–10, and blade sharpening $10–20 at a shop. Roughly $40 a year protects the engine, and the engine is what decides whether the mower is worth keeping at all.