On this equipment the failure type usually settles it before any arithmetic starts. That is the difference between this section and every other repair-or-replace guide, and it comes out of the prices rather than out of an opinion.
| What failed | Typical bill | Share of a new gas push mower ($230–$450) |
|---|---|---|
| Pull cord | $30–$50 | 7–22% |
| Carburetor, replaced | $45–$100 | 10–43% |
| Engine replacement, walk-behind | $260–$800 | 58–348% |
| Engine rebuild — a riding-mower figure | $860–$2,700 | 191–1,174% |
The rebuild row borrows the guide’s riding-mower bracket, because no walk-behind rebuild price is published. This site’s own floor for one is 52–151% of a push mower before the overhaul labor. There is almost nothing in the middle. Routine failures land in the low tens of percent; major ones blow past the price of a whole new machine. Break-even arithmetic on a $230 mower is theater.
Costs and machine prices verified August 2026 and dated on each page; next scheduled review November 2026, the three-month clock prices carry here.
Where the decision is actually real
The tool above short-circuits on purpose, and it is worth saying why rather than hiding it: most walk-behind mower owners do not have a decision to make. The genuine question lives on riding mowers and two-stage snowblowers, where replacement runs $1,800–$13,225 cheapest to dearest and $785–$2,015 in Lawn Love’s narrower “typical” band. There is one walk-behind exception. Lawn Love’s mower guide prices gas self-propelled mowers up to $2,300, and on a machine near the top of that class an engine swap is a real sum rather than an obvious no.
There is a second reason it short-circuits. A belt, a carburetor, a blade or a pull cord is a consumable. Replacing one does not buy the machine a new lifespan, it restores whatever lifespan it had. An engine or a transaxle is different: that repair buys a defined block of life, and that is where the annualized model belongs.
By machine
| Machine | Page | The thing most pages get wrong |
|---|---|---|
| Walk-behind mower | Is it worth repairing a lawn mower? | Leading with the quote. The failure type decides it first. |
| Riding mower | Riding mower: repair or replace? | Asking how old it is. An eight-year-old tractor might have 150 hours on it or 900. |
| Snowblower | Is it worth repairing a snowblower? | Ignoring the fees. On a snowblower the trip charge and minimum decide more than the fault does. |
| Pressure washer | Is it worth fixing a pressure washer? | Treating it as one machine. The pump and the engine have separate warranties and separate lives. |
| Chainsaw / trimmer | When to replace a chainsaw or string trimmer | Applying mower economics. The flat tune-up runs 32–41% of a cheap handheld and 12% of a pro saw. |
The two numbers underneath every page here
- How long does outdoor power equipment last? — there is a figure printed on most engines. Nearly every small gas engine sold in the US declares a useful-life period under federal emissions rules, and the label carries it; the page also covers the one class of engine whose label may not. It is a median rather than a guarantee, and this page is as careful about that as about the number itself. It is also honest about which equipment types have no usable figure at all.
- Is replacing a lawn mower engine worth it? — four paths, not two. A short block runs about four-fifths the price of a complete engine across four displacement classes, which is what rules the rebuild out.
The maintenance question
Is a lawn mower tune-up worth the money? — the tune-up priced against the average repair on the same machine class, all four of them. It runs 88% on a push mower and 163% on a zero-turn, so the answer flips by class rather than holding across the board. That is not an argument against tune-ups, but it is an argument against the reason usually given for them, and the page works out which one it actually is.
Four things that beat the calculator
- Safety. A chain or blade that moves at idle, a fuel leak, a machine you have been running in a garage. Not a budget question — stop.
- A cracked or rusted-through deck. The one failure where the machine is finished regardless of how well the engine runs.
- You don’t know the engine’s numbers yet. Parts and specs follow the engine, not the badge. A part that looks unobtainable under the mower’s name is often routine under the engine’s — see engines and brands.
- A warranty you forgot you had, or one you are about to void. Pressure-washer pumps and mower engines often carry different terms from the machine around them.
Next: with a quote in hand, go to what repairs cost. If it is still a symptom rather than a diagnosis, start at symptoms, priced.