My Suzuki misses and stalls abruptly when I pull the clutch lever in.

Original Customer Question: My Suzuki misses and stalls abruptly when I pull the clutch lever in. Do I need a fuel map, or is my Power Commander bad?

Before assuming it's a tuning or Power Commander issue, check your clutch switch—especially if you've installed aftermarket levers.

The ECU relies on input from the clutch switch to manage idle and fuel delivery. If this switch is misadjusted, dirty, or worn out, it can cause erratic stalling, missing, or even trigger false codes like C40 (clutch switch malfunction).

✅ Quick Checklist:

• Inspect the clutch switch alignment (refer to your service manual if adjustable).

• Make sure the switch is clean and functioning properly.

• If the switch looks old or suspect, replace it. A new one typically costs around $23 at your local Suzuki dealer—an easy fix that can save hours of troubleshooting.

🔍 Common Symptoms of a Bad Clutch Switch:

• Bike stalls or misses only when the clutch lever is pulled in.

• FI warning light flashes intermittently, even though engine temps are normal.

• Red temp warning light and alternating “FI”/odo display show up despite moderate coolant temps (170–198°F).

• Engine stutters briefly around 1500 RPM, then clears up with a quick blip of the throttle.

• Issue repeats randomly after restart, often within 10 minutes of riding.

If the symptoms above sound familiar, replacing the clutch switch is a smart first step before digging into the electronics or fuel mapping.