Craftsman 917255919 gt 18 twin-garden tractor Parts

For Craftsman model 917255919, the tractor uses an 18 HP twin-cylinder engine (a GT 18 twin-garden tractor configuration). This twin-cylinder setup is designed for cool-running performance and strong power for mowing and other yard tasks; see the 917255919 owner's manual.

A twin-cylinder riding mower engine typically runs smoother than a single-cylinder engine and holds power better under load (thick grass, hills, or pulling attachments).

Common benefits you will notice:

• Smoother operation with less vibration at the seat and steering wheel
• Better torque feel when the mower deck is engaged
• More consistent cutting in heavier grass
• Stronger performance for yard and garden attachments
• Easier speed control when conditions change

On older Craftsman tractors, the engine manufacturer and engine model are usually shown on the engine shroud, valve cover area, or an engine ID label.

We recommend these checks:

• Look for an engine ID tag near the starter, blower housing, or valve cover
• Record the engine model, type, and code (if listed)
• Confirm the tractor model and serial number from the fender-mounted model plate
• Compare the engine ID information to the engine section in the 917255919 owner's manual

Knowing the engine type helps you buy the right maintenance parts (spark plugs, air filter, fuel system parts) and follow the correct tune-up and safety procedures, especially around the muffler, spark arrester, and governor settings.

Last updated: February 2026

For Craftsman model 917255919, the engine brand is Briggs & Stratton; the tractor’s manual lists a Briggs & Stratton engine with model number 422437 (type 1256-01). For other Craftsman tractors, the engine brand can vary by model and production year.

When you’re buying tune-up parts or looking up engine specs, use the Briggs & Stratton identifiers from the tractor documentation.

• Engine manufacturer: Briggs & Stratton
• Engine model number: 422437
• Engine type number: 1256-01
• Best reference for exact specs and service points: 917255919 owner’s manual

We recommend confirming the numbers on the tractor before ordering.

• Check the model plate on the fender for the tractor model and serial number
• Check the engine label/stamping for the Briggs & Stratton model and type
• Record the numbers for future maintenance and parts lookups

Craftsman is the tractor brand, but engines are sourced from engine manufacturers. Using the correct engine brand and model/type prevents wrong-part returns, especially for carburetor, air cleaner, ignition, and gasket sets.

Last updated: February 2026

Replacing the engine on a Craftsman riding mower like model 917255919 typically costs $800 to $2,500 total (engine plus labor), depending on horsepower, crankshaft style, and whether you do the work yourself. If the tractor also needs belts, wiring, or fuel-system work, the total can run higher.

• Engine type and specs: V-twin engines and higher HP cost more than single-cylinder engines.
• Crankshaft configuration: Shaft diameter/length and keyway or tapped shaft must match your pulleys and PTO setup.
• Labor vs. DIY: Shop labor is often the biggest variable.
• Extra parts discovered during teardown: Common add-ons include a drive belt, blade belt, or electrical switches.
• Fuel system condition: Old fuel can create gum and corrosion issues; the manual emphasizes preventing deposits and managing ethanol-blended fuel during storage.

Use the 917255919 owner’s manual to confirm your tractor’s engine and drive layout, then verify these items before ordering:

• Engine mounting pattern and crankshaft measurements
• Wiring connections (charging circuit, ignition kill wire)
• Muffler and heat shielding condition (important for safe operation)
• Belt routing and pulley alignment
• Fuel tank and fuel line condition (stale fuel and ethanol blends can damage fuel components during storage)

These are not always required, but they are frequent “add-on” repairs when symptoms overlap:

• Lawn tractor ignition switch 532365402 (no-crank or intermittent start)
• Lawn tractor seat switch 532421062 (engine dies when you shift or hit bumps)
• Fuel tank 532151346 (leaks, contamination, or damaged fittings)

An engine replacement is only a good value if the rest of the tractor is solid. If the deck, belts, safety interlocks, and fuel system are in good shape, a new engine can restore reliable mowing for years and reduce repeat breakdowns.

Last updated: February 2026

For the Craftsman riding mower covered by this parts page, the model number is 917.255919 (often written without the dot as 917255919). You can confirm it on the model plate under the seat and in the 917255919 owner's manual.

On Craftsman riding mowers like model 917255919, the model plate is located under the seat. Use the model number from that plate when ordering parts or looking up diagrams.

• Lift the seat and look for the model plate or label
• Write down the full model number exactly as shown
• Use the model number (not deck size) to match parts correctly
• If the label is dirty, wipe it clean so all digits are readable

“42-inch” describes the cutting deck size, not the model identifier. Many Craftsman tractors can share the same deck size but use different belts, pulleys, switches, or fuel system parts.

Using the correct model number prevents ordering the wrong ground drive belt, blade drive belt, PTO switch, ignition switch, or safety interlock parts that can vary between similar-looking Craftsman tractors.

If you are replacing common wear items, match by model first, then confirm by part number:

• Lawn tractor blade drive belt 532110884
• Lawn tractor ignition switch 532365402
• Lawn tractor seat switch 532421062

Last updated: February 2026