Should I use 87 or 91 gas for lawn mower?
For the Craftsman model 24738916 walk-behind mower, use clean, fresh, unleaded gasoline with a minimum of 87 octane (87 AKI); using 91 octane is not required for normal operation. Avoid E85 and never mix oil into the gasoline. See the fuel requirements in the 24738916 owner's manual.
- Use unleaded gasoline, 87 octane minimum.
- Gasoline with up to 10% ethanol (E10) is acceptable.
- Gasoline with up to 15% MTBE is acceptable.
- Do not use E85 or other unapproved fuels.
- Do not mix oil in the gasoline (this is a 4-cycle engine setup).
Higher octane does not add power in a typical small mower engine; it mainly resists knock in high-compression engines.
| Fuel choice | OK to use? | What to expect |
|---|---|---|
| 87 octane (minimum) | Yes | Normal starting and performance |
| 91 octane | Yes | Typically no noticeable benefit |
| E10 (up to 10% ethanol) | Yes | Common pump gas; store carefully |
| E85 | No | Can damage fuel system and engine components |
- Buy fuel in small quantities so it stays fresh.
- Keep the gas can sealed and stored away from heat.
- If the mower sits often, follow off-season fuel steps in the 24738916 owner's manual.
- Wipe up spills right away; fuel can damage paint and some plastics.
Using the correct fuel helps protect the carburetor and fuel system, improves starting reliability, and reduces the chance of varnish and gum buildup during storage.
Last updated: January 2026
What model number is the Craftsman 24738916?
The model number for this Craftsman walk-behind mower is 247.38916 (often written without the dot as 24738916). You can also confirm it on the identification label and in the Craftsman 24738916 owner's manual.
Look for the model/serial label in common walk-behind mower locations:
- On the rear of the deck near the discharge opening
- On the top of the deck near the engine mounting area
- Near the rear wheel height-adjuster area
- On the handle bracket area (varies by build)
Both formats refer to the same mower; the dot is a formatting style used on some labels and manuals.
| You might see it as | What it means |
|---|---|
| 247.38916 | Model number with dot formatting |
| 24738916 | Same model number without the dot |
When ordering parts or checking diagrams, these identifiers are commonly used:
- Mower model: 247.38916
- Engine model (from the manual): 126T02-0863-B1
- Product type/category: Craftsman gas walk-behind mower (Walk-behind mower parts)
Using the exact model number ensures you get the correct blade, deck, wheel, and control-cable parts for your specific Craftsman mower; even small model-number differences can change fit and hardware.
Last updated: January 2026
Where is Craftsman's model number?
On the Craftsman walk-behind mower model 24738916, the mower model number is shown in the product documentation as Model No. 247.38916. For the engine itself, the engine model number is listed separately in the manual as Engine Model No. 126T02-0863-B1; use the 24738916 owner's manual to match the correct ID to the part you’re servicing.
The mower and the engine can have different model identifiers. Use the one that matches what you’re repairing.
- Mower parts (deck, handle, wheels, bagging): use 24738916
- Engine parts (carburetor, recoil starter, ignition): use 126T02-0863-B1
- If you’re ordering a mower component like a grass bag, match it to the mower model
- If you’re ordering an engine component, match it to the engine model
On most Craftsman walk-behind mowers, the mower model label is typically found on the mower housing or deck area.
- Top of the deck near the engine mounting area
- Rear of the deck near the discharge opening
- Near the handle mounting points
- On a label plate or sticker on the deck
| What you’re identifying | What to use | Example from this model |
|---|---|---|
| Mower (unit) model | Mower model number | 24738916 (shown as 247.38916) |
| Engine model | Engine model number | 126T02-0863-B1 |
| Bagging attachment | Mower model number + part number | Lawn mower grass bag 964-04154 |
Using the correct model number prevents ordering the wrong parts. The mower model number ties to chassis and deck parts (like the blade, wheels, and handle), while the engine model number ties to engine-specific parts and diagrams.
Last updated: January 2026





