Suzuki M50 Problems

The Suzuki M50, also known as the Boulevard M50, is a popular cruiser known for its sleek styling, comfortable ride, and affordability. However, like any motorcycle, it's not without its quirks and potential problems. Understanding these common issues can help you make an informed purchase, maintain your bike effectively, and troubleshoot problems should they arise, ultimately keeping you on the road and enjoying your ride.

So, What Are the Most Common M50 Issues?

While the M50 is generally considered a reliable motorcycle, certain issues tend to crop up more frequently than others. These range from minor annoyances to more serious mechanical concerns. Knowing what to look for can save you time, money, and frustration.

Fuel Injection Gremlins: One of the most frequently discussed issues with the M50 revolves around its fuel injection system. It's not inherently unreliable, but it can be sensitive to changes in altitude, temperature, and even fuel quality.

Surging and Hesitation: Many riders report experiencing surging or hesitation, particularly at lower RPMs. This can manifest as an uneven throttle response, making smooth acceleration challenging. The cause can vary from a dirty throttle position sensor (TPS) to a vacuum leak or even a clogged fuel injector.
Cold Start Issues: Another common complaint is difficulty starting the bike when cold. This can be exacerbated by a weak battery, but it's often related to the fuel injection system not properly enriching the mixture for cold starts. Sometimes, a simple adjustment of the idle speed can help.
Fuel Injector Clogging: Over time, deposits can build up in the fuel injectors, restricting fuel flow and leading to poor performance. Using a fuel injector cleaner regularly can help prevent this.

The Dreaded Tick: A noticeable ticking sound, particularly from the top end of the engine, is a concern for many M50 owners. This sound often becomes more pronounced as the engine warms up.

Valve Lash Adjustment: In many cases, the ticking is caused by excessive valve lash. Valve lash refers to the small gap between the rocker arm and the valve stem. As the engine wears, this gap can increase, leading to a ticking noise. A valve lash adjustment, performed by a qualified mechanic, can usually resolve this issue.
Cam Chain Tensioner: In some instances, the ticking can be related to the cam chain tensioner. This component maintains proper tension on the cam chain, which drives the camshafts. If the tensioner malfunctions, the cam chain can become loose, leading to noise and potentially more serious engine damage. A failing tensioner often exhibits other symptoms, like rattling or unusual engine noises alongside the ticking.
Exhaust Leaks: Before tearing into the engine, it's wise to check for exhaust leaks near the cylinder head. A small exhaust leak can sometimes mimic the sound of a valve tick.

Clutch Concerns: The clutch on the M50 is generally reliable, but it's not immune to problems.

Clutch Slippage: Clutch slippage occurs when the clutch plates fail to properly engage, causing the engine to rev without transferring power to the rear wheel. This is often caused by worn clutch plates, contaminated with oil, or improper cable adjustment.
Clutch Drag: Clutch drag occurs when the clutch fails to fully disengage, making it difficult to shift gears or find neutral. This can be caused by a warped clutch plate, air in the hydraulic system (if equipped), or improper cable adjustment.
Hydraulic Clutch Issues: Some M50 models have a hydraulic clutch system. These systems can be prone to leaks or air in the lines, leading to clutch drag or a spongy feel. Regular bleeding of the hydraulic system is essential.

Electrical Quirks: Like many motorcycles, the M50 can experience electrical issues.

Stator Failure: The stator is a component of the charging system that generates electricity to recharge the battery. Stator failure is a relatively common issue on the M50. Symptoms include a weak battery, difficulty starting, and dimming lights.
Rectifier/Regulator Failure: The rectifier/regulator converts AC voltage from the stator to DC voltage and regulates the voltage to prevent overcharging the battery. If this component fails, it can lead to a dead battery or, even worse, damage to electrical components.
Wiring Harness Issues: Over time, the wiring harness can become brittle and corroded, leading to shorts or open circuits. This can manifest as a variety of electrical problems, such as lights not working, the engine not starting, or the fuel pump not priming. Inspecting the wiring harness for damage and corrosion is essential, especially in areas exposed to the elements.

Final Drive Woes (Shaft Drive Models): The M50 utilizes a shaft drive system, which is generally low-maintenance. However, it's not completely trouble-free.

Rear Differential Leaks: The rear differential can develop leaks over time. Regularly checking the fluid level and seals is essential.
Shaft Drive Noise: Unusual noises from the shaft drive can indicate a problem with the universal joints or bearings. These components should be inspected and lubricated regularly.

Brake Problems: Maintaining your brakes is crucial for safety.

Spongy Brake Lever: A spongy brake lever indicates air in the brake lines. Bleeding the brakes is necessary to remove the air and restore proper braking performance.
Warped Rotors: Warped brake rotors can cause pulsating braking and reduced stopping power. This is often caused by overheating the rotors.
Sticking Calipers: Brake calipers can stick due to corrosion or dirt buildup. This can lead to uneven brake wear and reduced braking performance. Regular cleaning and lubrication of the calipers are essential.

Preventative Maintenance: Your Best Defense

Many of the problems listed above can be prevented or mitigated through regular preventative maintenance.

Regular Oil Changes: Changing your oil and filter at the recommended intervals is crucial for engine health.
Air Filter Maintenance: A clean air filter ensures proper airflow to the engine.
Fuel Injector Cleaner: Using a fuel injector cleaner regularly can help prevent fuel injector clogging.
Valve Lash Adjustment: Checking and adjusting the valve lash at the recommended intervals can prevent ticking and ensure proper valve operation.
Battery Maintenance: Keeping your battery charged and properly maintained is essential for reliable starting.
Brake Fluid Flush: Flushing the brake fluid every two years removes moisture and contaminants, ensuring proper brake performance.
Tire Pressure Monitoring: Maintaining proper tire pressure is essential for handling and safety.
Chain Lubrication (If Applicable): Although the M50 is shaft driven, if you own a different bike, regular chain lubrication is crucial for chain life and smooth operation.
Shaft Drive Fluid Changes: For shaft drive models, changing the final drive fluid at the recommended intervals is essential for maintaining proper lubrication and preventing damage.

Troubleshooting Tips: What To Do When Things Go Wrong

If you encounter a problem with your M50, here are some general troubleshooting tips:

Start with the Basics: Check the obvious things first, such as the fuel level, battery connections, and fuses.
Consult the Owner's Manual: The owner's manual contains valuable information about troubleshooting common problems.
Use a Diagnostic Tool: A diagnostic tool can help you identify problems with the fuel injection system and other electronic components.
Search Online Forums: Online forums dedicated to the M50 can be a valuable resource for troubleshooting information.
Consult a Qualified Mechanic: If you're not comfortable working on your motorcycle, consult a qualified mechanic.

Upgrades and Modifications: Addressing Potential Weaknesses

While some consider them "fixes", many riders opt for upgrades or modifications to address perceived weaknesses in the M50.

Fuel Controller: A fuel controller allows you to fine-tune the fuel injection system, improving performance and addressing surging or hesitation issues.
Aftermarket Exhaust: An aftermarket exhaust can improve performance and sound, but it may require a fuel controller to optimize the fuel mixture.
Suspension Upgrades: Upgrading the suspension can improve handling and ride comfort.
Lighting Upgrades: LED lighting upgrades can improve visibility and safety.

Frequently Asked Questions

Why does my M50 tick? Ticking noises are often due to excessive valve lash, which can be resolved with a valve adjustment. It could also be a sign of a failing cam chain tensioner, or even a small exhaust leak.
My M50 is hard to start when cold. What could be the problem? This is often related to the fuel injection system not properly enriching the mixture. Check the battery, and consider adjusting the idle speed slightly.
What is the recommended oil change interval for the M50? Refer to your owner's manual, but generally, an oil change every 3,000-5,000 miles is recommended.
How do I check the valve lash on my M50? This requires specialized tools and knowledge. It's best to consult a qualified mechanic for this task.
My clutch is slipping. What should I do? Check the clutch cable adjustment first. If that doesn't resolve the issue, the clutch plates may be worn and need replacement.

In Conclusion

The Suzuki M50 is a great motorcycle, but understanding its potential problems is key to keeping it running smoothly. By performing regular preventative maintenance and addressing issues promptly, you can enjoy many years of reliable riding. Don't hesitate to consult a qualified mechanic if you're not comfortable performing repairs yourself.