The Suzuki Intruder 1400, a classic cruiser known for its muscular looks and robust engine, has captured the hearts of riders for decades. While celebrated for its comfort and distinctive rumble, even the most beloved motorcycles can have their quirks. This article dives into some of the common problems that Intruder 1400 owners might encounter, offering insights and potential solutions to keep your ride smooth and enjoyable.

Getting to Know the Intruder 1400: A Quick Recap

Before we delve into the potential issues, let’s briefly acknowledge what makes the Intruder 1400 (also known as the VS1400) so popular. Produced from 1987 to 2004, it boasts a large-displacement, air/oil-cooled V-twin engine, shaft drive, and a comfortable riding position. Its simplicity, reliability, and relatively affordable price made it a hit. However, age and design choices mean certain issues are more prevalent than others. Knowing these potential pitfalls can help you diagnose problems quickly and prevent them from escalating.

The Dreaded "Click": Starting Problems

One of the most frequently reported issues with the Intruder 1400 is starting problems, often manifested as a single "click" when you hit the starter button. This can be incredibly frustrating, especially when you're ready to hit the open road.

What's happening? This "click" typically indicates a problem within the starting circuit. The most common culprits are:

  • Weak Battery: This is the first place to check. A battery that's not holding a charge or is simply old won't provide enough power to engage the starter motor.
  • Dirty or Corroded Connections: Corrosion on battery terminals, starter solenoid connections, or even ground connections can impede the flow of electricity.
  • Faulty Starter Solenoid: The starter solenoid is a relay that sends power to the starter motor. If it's failing, it might not be able to handle the load.
  • Worn Starter Motor: Over time, the starter motor itself can wear out, leading to reduced performance and eventual failure.
  • Loose or Broken Wiring: Less common, but still possible, is a break in the wiring within the starting circuit.

How to Fix It:

  1. Battery Check: Test the battery with a multimeter to ensure it's holding a charge and providing sufficient voltage (around 12.6 volts when fully charged). If it's weak, replace it.
  2. Clean Connections: Disconnect the battery (negative terminal first!) and thoroughly clean all connections with a wire brush or sandpaper. Apply dielectric grease to prevent future corrosion.
  3. Solenoid Test: You can test the solenoid by jumping the two large terminals with a screwdriver (be careful – it will spark!). If the starter motor engages, the solenoid is likely the problem. Replace it.
  4. Starter Motor Inspection: If the solenoid is good, the starter motor itself might be the issue. You can try tapping it gently with a hammer while pressing the starter button. If it suddenly engages, the starter motor is likely on its way out and needs to be rebuilt or replaced.
  5. Wiring Check: Inspect the wiring for any signs of damage, breaks, or loose connections. Use a multimeter to check for continuity in the wires.

Fueling Woes: Carburetor Conundrums

The Intruder 1400 utilizes carburetors, which, while reliable, can be susceptible to issues, especially as the bike ages. Fueling problems can manifest in various ways, including rough idling, poor acceleration, backfiring, and stalling.

What's happening? Common carburetor-related problems include:

  • Clogged Jets: The small jets within the carburetors can become clogged with debris from old fuel or rust from the fuel tank.
  • Dirty Carburetors: Overall dirt and grime buildup inside the carburetors can affect their performance.
  • Vacuum Leaks: Leaks in the vacuum lines connected to the carburetors can disrupt the air/fuel mixture.
  • Float Issues: The float controls the fuel level in the carburetor. If it's stuck or damaged, it can cause flooding or fuel starvation.
  • Incorrect Fuel/Air Mixture: If the carburetors aren't properly adjusted, the air/fuel mixture can be too rich or too lean.

How to Fix It:

  1. Carburetor Cleaning: The most common solution is to thoroughly clean the carburetors. This involves disassembling them, soaking the parts in carburetor cleaner, and using compressed air to clear out any blockages.
  2. Vacuum Line Inspection: Carefully inspect all vacuum lines for cracks or leaks. Replace any damaged lines.
  3. Float Adjustment: Check the float level and adjust it according to the manufacturer's specifications.
  4. Carburetor Synchronization: After cleaning and reassembling the carburetors, it's essential to synchronize them. This ensures that both cylinders are receiving the same amount of air and fuel, resulting in smoother performance. A vacuum gauge is typically used for this process.
  5. Fuel Filter Check: A clogged fuel filter can restrict fuel flow to the carburetors. Replace it regularly.

Shaft Drive Dilemmas: Keeping the Power Flowing

The Intruder 1400's shaft drive is generally reliable, but it's not entirely maintenance-free. Neglecting the shaft drive can lead to problems.

What's happening?

  • Insufficient Lubrication: The shaft drive requires regular lubrication with the correct type of gear oil. Neglecting this can lead to excessive wear and tear on the gears and bearings.
  • Worn U-Joints: The U-joints in the shaft drive can wear out over time, causing vibrations and noise.
  • Rear Differential Issues: Problems within the rear differential, such as worn bearings or damaged gears, can also cause problems.

How to Fix It:

  1. Regular Lubrication: Follow the manufacturer's recommended maintenance schedule for lubricating the shaft drive. Use the correct type of gear oil.
  2. U-Joint Inspection: Inspect the U-joints for play or looseness. If they're worn, they need to be replaced.
  3. Rear Differential Service: If you suspect a problem with the rear differential, it's best to take it to a qualified mechanic for inspection and repair.

Electrical Gremlins: Chasing Down the Issues

Like any older motorcycle, the Intruder 1400 can suffer from electrical problems. Wiring can become brittle, connections can corrode, and components can fail.

What's happening?

  • Corroded Connections: Corrosion is a common enemy of electrical systems. It can impede the flow of electricity and cause various problems.
  • Brittle Wiring: Over time, the insulation on the wiring can become brittle and crack, leading to shorts or open circuits.
  • Faulty Sensors: Sensors, such as the side stand switch or the neutral switch, can fail, causing starting or running problems.
  • Regulator/Rectifier Issues: The regulator/rectifier is responsible for charging the battery and regulating the voltage. If it fails, it can lead to a dead battery or damage to other electrical components.

How to Fix It:

  1. Connection Cleaning: Clean all electrical connections with a wire brush or sandpaper and apply dielectric grease.
  2. Wiring Repair: Repair or replace any damaged wiring.
  3. Sensor Testing: Test the sensors with a multimeter to ensure they're functioning correctly. Replace any faulty sensors.
  4. Regulator/Rectifier Testing: Test the regulator/rectifier with a multimeter to ensure it's charging the battery properly. If it's faulty, replace it.

The Mysterious Misfire: Tracking Down the Cause

A misfire occurs when one or more cylinders fail to fire properly. This can cause rough running, loss of power, and poor fuel economy.

What's happening?

  • Faulty Spark Plugs: Worn or fouled spark plugs are a common cause of misfires.
  • Weak Ignition Coils: The ignition coils are responsible for providing the high voltage needed to ignite the fuel. If they're weak, they can cause misfires.
  • Spark Plug Wires: Damaged or corroded spark plug wires can also cause misfires.
  • Carburetor Issues: As mentioned earlier, carburetor problems can also lead to misfires.
  • Valve Problems: In more severe cases, misfires can be caused by valve problems, such as worn valve seats or bent valves.

How to Fix It:

  1. Spark Plug Replacement: Replace the spark plugs with new ones. Make sure to use the correct type of spark plugs for your motorcycle.
  2. Ignition Coil Testing: Test the ignition coils with a multimeter to ensure they're providing the correct voltage. Replace any faulty coils.
  3. Spark Plug Wire Inspection: Inspect the spark plug wires for damage or corrosion. Replace any damaged wires.
  4. Carburetor Cleaning and Adjustment: Clean and adjust the carburetors as described earlier.
  5. Valve Inspection: If the misfire persists, it's best to take the motorcycle to a qualified mechanic for a valve inspection.

Frequently Asked Questions about Intruder 1400 Problems

  • Why does my Intruder 1400 backfire? Backfiring is often caused by a lean fuel mixture or exhaust leaks. Check your carburetors and exhaust system.

  • How often should I change the oil in my Intruder 1400? Change the oil every 3,000 miles or once a year, whichever comes first. Use the recommended type of oil for your motorcycle.

  • What type of battery does the Intruder 1400 use? The Intruder 1400 typically uses a 12-volt, 18-20 amp-hour battery. Refer to your owner's manual for the exact specifications.

  • Why is my Intruder 1400 hard to shift? Hard shifting can be caused by a worn clutch, low oil level, or a bent shift fork. Inspect these components and address any issues.

  • Where can I find parts for my Intruder 1400? You can find parts at online retailers, local motorcycle shops, and sometimes even on auction sites. Be sure to verify compatibility before purchasing.

In Conclusion

The Suzuki Intruder 1400 is a fantastic motorcycle, but like any machine, it can experience problems over time. By understanding the common issues and their potential solutions, you can keep your Intruder 1400 running smoothly for years to come. Regular maintenance and prompt attention to any warning signs are key to preserving the reliability and enjoyment of your ride.