Quick Answer: How to Start Your Craftsman Riding Mower
To start a Craftsman riding lawn mower, sit on the seat to engage the safety switch, set the fuel valve to ON, position the choke to FULL CHOKE (cold start) or HALF CHOKE (warm start), insert the key and turn it to START, then gradually move the throttle to half-throttle once the engine fires. Release the key when the engine starts and allow 30 seconds of warm-up before operating.
Understanding Craftsman Riding Mower Safety Systems
Before learning the startup procedure, it’s essential to understand the safety mechanisms built into Craftsman riding mowers. These interlocks prevent accidental starting and protect you from injury.
The Seat Safety Switch is the primary safety feature. When you sit on the mower seat, you complete an electrical circuit that allows the ignition system to function. If you leave the seat while the engine is running, the engine will shut off automatically. This switch cannot be bypassed—the mower simply will not start without proper seat engagement.
The Blade Brake Clutch stops the mower deck blades within three seconds of releasing the blade engagement lever. This prevents injuries from spinning blades during startup or shutdown.
The Parking Brake must be engaged before starting. On most Craftsman models, this is a simple lever or pedal mechanism that keeps the mower stationary during cold starts.
Pre-Start Checklist: Essential Inspections Before Starting
Always perform these checks before attempting to start your Craftsman riding mower:
- Fuel Level: Check the fuel tank is filled with fresh gasoline (less than 30 days old). Old fuel can prevent starting and damage the carburetor.
- Oil Level: Pull the dipstick and verify oil reaches the full mark. Low oil will trigger safety shutoffs on many Craftsman models and can damage the engine.
- Battery Condition: Ensure the battery terminals are clean and corrosion-free. A weak battery (below 12 volts) will produce slow cranking and prevent reliable starting.
- Spark Plug: If the mower hasn’t started in weeks, inspect the spark plug for carbon buildup or excessive gap.
- Air Filter: A clogged air filter restricts airflow and makes starting difficult. Replace if visibly dirty or clogged.
- Parking Brake: Confirm the parking brake is fully engaged.
Cold Start vs. Warm Start: Choke Position Differences
The choke controls the fuel-air mixture entering the carburetor. Different starting conditions require different choke positions.
Cold Start (Engine Below 50°F or First Start of the Day): Move the choke lever or dial to FULL CHOKE. This enriches the fuel mixture to help the cold engine ignite. Once the engine starts and runs for 15-30 seconds, the choke should be gradually moved toward the OFF position as the engine warms.
Warm Start (Engine Already Warm or Recent Shutdown): Move the choke to HALF CHOKE or OFF. A warm engine doesn’t require additional fuel enrichment. Using full choke on a warm engine will cause excessive smoke and flooding.
Determining If Your Engine Is Cold or Warm: A cold engine hasn’t run in several hours or overnight. A warm engine shut down within the last 30 minutes. When in doubt, start with half choke—if the engine struggles, move the choke to full and try again.
Step-by-Step Starting Procedure for Craftsman Riding Mowers
Follow this sequence for reliable starts on most Craftsman riding mower models:
- Mount the Mower: Sit firmly on the seat. You should hear or feel a click as the seat safety switch engages. The dashboard lights should illuminate.
- Engage the Parking Brake: Pull the parking brake lever fully toward you or press the parking brake pedal. The mower must not be in motion.
- Set the Fuel Valve: Locate the fuel valve (typically on the underside of the fuel tank or on the fuel line). Turn it to the ON position. This allows fuel to flow from the tank to the carburetor. Some newer Craftsman models have fuel valves that open automatically.
- Position the Choke: For a cold start, move the choke lever to FULL CHOKE. For a warm start, move it to HALF CHOKE or OFF.
- Move the Throttle: Set the throttle lever to the FAST or HIGH position (typically the rightmost position or marked with a rabbit symbol).
- Insert and Turn the Key: Insert the ignition key and turn it clockwise to the START position. Hold the key in START for no more than 5-10 seconds. The engine should crank and attempt to ignite.
- Release the Key: Once the engine fires and begins running, release the key immediately. It will return to the ON position automatically.
- Adjust the Choke During Warmup: As the engine runs, gradually move the choke toward the OFF position over 30-60 seconds. If the engine sputters or stalls, move the choke back toward FULL briefly, then continue the transition to OFF.
- Reduce Throttle: After 30 seconds of running, you can lower the throttle to HALF or LOW for idle operation. The engine is now warmed up.
Model-Year Variations: Older vs. Newer Craftsman Mowers
Startup procedures can vary between Craftsman model generations due to differences in ignition systems and carburetor design.
Older Craftsman Models (Pre-2000s): Mowers from this era often have simpler mechanical chokes and may require priming. Before starting, press a primer bulb 3-5 times (if equipped) to draw fuel into the carburetor. These models typically use pull-cord starters or older electric starters with less sophisticated safety interlocks. The seat safety switch may be less responsive.
Modern Craftsman Models (2000s-Present): Newer mowers feature electronic fuel injection or updated carburetors with automatic choke systems on some models. Electric starters are more reliable, and safety interlocks are fully integrated into the engine control module. Many newer models require the choke lever to be moved only to a single position, with the engine managing the fuel mixture electronically.
Craftsman Zero-Turn Models: Zero-turn mowers may have dual ignition keys (one for each engine) or a single-key system. Startup sequence is identical to traditional riding mowers, but ensure both seat switches are engaged if dual-seated models.
Mowers with Pull-Cord Starters: Older or budget Craftsman models use a pull-cord instead of an electric starter. Set the choke, fuel valve, and throttle as described above, then grasp the pull-cord handle and pull sharply with a quick motion. Repeat 2-3 times if needed. Pull-cord starters often require more physical effort.
Troubleshooting Common Starting Problems
Engine Cranks But Won’t Start: This indicates the starter is working but fuel or ignition isn’t reaching the engine. Check that the fuel valve is ON, the choke is properly positioned (try FULL CHOKE), and the spark plug is firing (you should see a small spark near the spark plug boot). If the problem persists, the carburetor may be clogged from old fuel—drain the tank and refill with fresh gasoline.
Slow Cranking or No Cranking: The battery is likely weak or dead. Check battery terminals for corrosion and clean with a wire brush if needed. If the battery is more than 3-4 years old, it may need replacement. A voltmeter should read 12-13 volts when the key is turned to ON.
Engine Starts Then Immediately Stalls: This usually indicates a choke problem. The engine is being deprived of fuel as the choke moves to OFF too quickly. Try starting again, but move the choke more gradually toward OFF, or hold it in a mid-position for several seconds before fully opening.
Excessive Smoke During Startup: You’re using too much choke (fuel enrichment). Start the engine with HALF CHOKE or OFF instead of FULL CHOKE next time. Smoke should clear after a few seconds of running.
Fuel Leaking During Startup: The carburetor may be overflowing, indicating a stuck float or dirty needle valve. Stop attempting to start and allow the fuel to drain. Contact a dealer or small-engine technician for carburetor service.
Post-Start Operation: Warming Up Before Mowing
Once your Craftsman mower starts, allow the engine to warm up properly before engaging the mower deck or driving at full speed.
Warm-Up Period: Run the engine at half-throttle for 30-60 seconds after starting. You’ll notice the engine sound becomes steadier and smoother as it warms. This allows oil to circulate and the carburetor to stabilize.
Choke Transition: Complete the transition to OFF choke position during this warm-up period. If the engine sputters when you fully open the choke, move it back to HALF briefly and try again in 10 seconds.
Engaging the Mower Deck: Only engage the blade control lever once the engine has run steadily for at least 30 seconds. Engaging the blades on a cold, unstable engine can cause stalling or erratic blade speed.
Operating Throttle: For mowing, move the throttle to FAST or HIGH. This ensures consistent blade speed and proper cutting height. Never mow at idle throttle, as this starves the engine of fuel and can cause damage.
Frequently Asked Questions
Why won’t my Craftsman riding mower start even though the battery is good?
If the battery and starter are functioning but the engine won’t turn over, the most common cause is a faulty seat safety switch. Ensure you’re sitting firmly on the seat and hear a distinct click. If clicking occurs but the engine still won’t start, the seat switch may need replacement. Other possibilities include a clogged fuel filter, a dirty spark plug, or a flooded carburetor (which happens when too much choke is used repeatedly). Try letting the mower sit for 15 minutes, then attempt starting with the choke set to OFF.
Can I start my Craftsman mower without sitting on the seat?
No. The seat safety switch is a mandatory safety feature that prevents accidental starting and injuries. Without engaging the switch by sitting on the seat, the electrical circuit to the starter remains open. Some older Craftsman models may have mechanical switches that can be manually overridden, but this bypasses critical safety protection and is strongly discouraged. Always sit on the seat before attempting to start.
How often should I replace the spark plug on my Craftsman riding mower?
Replace the spark plug annually or after every 100-200 hours of operation, whichever comes first. A worn spark plug produces weak ignition and makes starting difficult, especially in cold conditions. If your mower is having chronic starting problems, a new spark plug is an inexpensive first diagnostic step. Clean the spark plug gap with a feeler gauge if replacement isn’t immediately possible.
What should I do if my mower floods and won’t start?
Flooding occurs when too much fuel enters the combustion chamber, usually from repeated use of full choke on a warm engine. If you suspect flooding, turn the ignition OFF and wait 15-20 minutes for excess fuel to evaporate. Then try starting with the choke set to OFF and the throttle at FAST. If the mower still doesn’t start, remove the spark plug, dry it with a clean cloth, and reinstall it. This allows any fuel on the plug to evaporate. If flooding persists frequently, the carburetor float or needle valve may be stuck—have a technician service the carburetor.
