The Kawasaki W650, a retro-styled motorcycle reminiscent of classic British twins, charmed many with its vintage aesthetics and engaging riding experience. However, beneath its appealing exterior, the W650 isn't without its quirks and potential problems. Understanding these common issues is crucial for prospective buyers and current owners alike, ensuring they can enjoy this classic-inspired machine to its fullest potential while minimizing unexpected headaches.

The Allure of the W650: A Brief Recap

Before diving into the nitty-gritty, let's quickly remember why the W650 is beloved by so many. Launched in 1999 (and discontinued in 2007, though the W800 carries its spirit), the W650 offered a refreshing alternative to modern, high-performance motorcycles. Its parallel-twin engine, shaft-driven bevel gear camshaft, and classic styling harked back to a bygone era, providing a unique riding experience that prioritized character and enjoyment over outright speed. However, that unique design also contributes to some of its known issues.

Common W650 Issues: What to Watch Out For

Let's explore some of the most frequently reported problems encountered by W650 owners. This isn't an exhaustive list, but it covers the most common concerns.

1. The Dreaded Bevel Gear Failure: A W650 Achilles' Heel

The W650's most notorious issue revolves around its bevel gear camshaft drive. This system, while mechanically interesting and contributing to the engine's distinctive sound, is prone to wear and eventual failure if not properly maintained.

  • What Happens: The bevel gear, responsible for transferring power from the crankshaft to the camshaft, can suffer from excessive wear on its teeth. This wear is often accelerated by insufficient lubrication or the use of incorrect oil.
  • Symptoms: Telltale signs of impending bevel gear doom include a noticeable increase in engine noise, often described as a whirring or whining sound, particularly at higher RPMs. You might also experience a loss of power or misfiring. Ignoring these symptoms can lead to catastrophic engine damage.
  • The Fix: The only real solution is to replace the worn bevel gear. This is a relatively involved job, requiring specialized tools and a good understanding of engine mechanics. It's generally recommended to have this work done by a qualified mechanic. Consider upgrading to aftermarket bevel gears that are often made with stronger materials for improved longevity.
  • Prevention is Key: The best defense against bevel gear failure is diligent maintenance. This includes:
    • Using the Correct Oil: Always use the oil grade and type specified in the owner's manual. High-quality, motorcycle-specific oil is essential.
    • Regular Oil Changes: Adhere to the recommended oil change intervals.
    • Checking Oil Levels: Regularly check the oil level and top it up as needed. Low oil levels significantly increase the risk of bevel gear wear.
    • Listen to Your Engine: Pay attention to any unusual noises coming from the engine. Early detection of bevel gear wear can save you from a much larger repair bill.

2. Carburetor Woes: Keeping the Fuel Flowing

The W650, being a pre-fuel-injection motorcycle, relies on carburetors to deliver fuel to the engine. Carburetors can be sensitive to changes in temperature, humidity, and fuel quality, leading to various issues.

  • Common Problems:
    • Dirty Carburetors: Debris and varnish can build up in the carburetors, restricting fuel flow and causing poor performance, rough idling, and difficulty starting.
    • Incorrect Jetting: The carburetor jets might be incorrectly sized for your riding conditions or aftermarket modifications. This can result in a lean or rich fuel mixture, leading to poor performance and potential engine damage.
    • Float Problems: Issues with the carburetor floats can cause fuel overflow or starvation, leading to erratic engine behavior.
  • Symptoms: Symptoms of carburetor problems include:
    • Difficulty starting, especially when cold.
    • Rough idling or stalling.
    • Poor acceleration or hesitation.
    • Backfiring.
    • Poor fuel economy.
  • The Fix:
    • Carburetor Cleaning: Regularly cleaning the carburetors is essential. This involves disassembling the carburetors, cleaning all the jets and passages, and reassembling them.
    • Carburetor Tuning: Adjusting the carburetor settings, such as the pilot screw and needle position, can improve performance and fuel economy.
    • Re-jetting: If you've made modifications to your W650, such as installing aftermarket exhaust, you might need to re-jet the carburetors to optimize the fuel mixture.
    • Float Adjustment: Check and adjust the carburetor float levels to ensure proper fuel flow.
  • Prevention:
    • Use Fresh Fuel: Avoid using stale or old fuel.
    • Fuel Stabilizer: Add a fuel stabilizer to the fuel when storing your W650 for extended periods.
    • Clean Fuel Filter: Regularly replace the fuel filter to prevent debris from entering the carburetors.

3. Electrical Gremlins: Tracing the Wires

Like many older motorcycles, the W650 can be susceptible to electrical problems.

  • Common Issues:
    • Loose Connections: Vibration and age can cause electrical connections to loosen, leading to intermittent problems.
    • Corroded Connectors: Exposure to moisture and the elements can cause corrosion on electrical connectors, hindering electrical conductivity.
    • Faulty Wiring: Damaged or frayed wiring can cause short circuits or open circuits.
    • Charging System Problems: Issues with the alternator, rectifier/regulator, or battery can lead to charging problems.
  • Symptoms: Symptoms of electrical problems include:
    • Intermittent starting problems.
    • Dim or flickering lights.
    • Malfunctioning gauges.
    • Battery drain.
  • The Fix:
    • Check Connections: Inspect all electrical connections for looseness or corrosion. Clean and tighten connections as needed.
    • Trace Wiring: Use a multimeter to trace wiring and identify any damaged or faulty wires. Replace damaged wiring.
    • Test Charging System: Use a multimeter to test the alternator, rectifier/regulator, and battery to identify any charging system problems. Replace faulty components.
  • Prevention:
    • Regular Inspection: Regularly inspect the electrical system for any signs of damage or corrosion.
    • Use Dielectric Grease: Apply dielectric grease to electrical connections to prevent corrosion.
    • Proper Storage: Store your W650 in a dry place to minimize exposure to moisture.

4. Exhaust System Issues: Rust and Leaks

The exhaust system on the W650, especially on older models, can be prone to rust and leaks.

  • Common Problems:
    • Rust: The exhaust pipes and mufflers can rust, especially in areas with high humidity or where road salt is used.
    • Exhaust Leaks: Exhaust leaks can occur at the joints between the exhaust pipes and mufflers, or at the cylinder head.
  • Symptoms:
    • Rust on the exhaust pipes and mufflers.
    • Exhaust leaks, which can be identified by a hissing sound or the smell of exhaust fumes.
    • Reduced performance.
  • The Fix:
    • Rust Removal: Remove rust from the exhaust pipes and mufflers using a wire brush or chemical rust remover.
    • Exhaust Repair: Repair exhaust leaks by welding or using exhaust sealant.
    • Exhaust Replacement: Replace severely rusted or damaged exhaust components.
  • Prevention:
    • Regular Cleaning: Regularly clean the exhaust system to remove dirt and grime.
    • Rust Prevention: Apply a rust preventative coating to the exhaust system.
    • Proper Storage: Store your W650 in a dry place to minimize exposure to moisture.

5. Suspension and Handling: An Area for Improvement

While the W650 is praised for its comfortable ride, the suspension can feel somewhat soft and underdamped, especially when riding aggressively or carrying a passenger.

  • Common Issues:
    • Soft Suspension: The stock suspension can feel soft and prone to bottoming out.
    • Poor Damping: The damping can be inadequate, leading to a bouncy or uncontrolled ride.
  • The Fix:
    • Fork Spring Upgrade: Replace the stock fork springs with stiffer springs.
    • Fork Oil Upgrade: Use a higher viscosity fork oil.
    • Rear Shock Upgrade: Replace the stock rear shocks with aftermarket shocks that offer better damping and adjustability.
  • Prevention:
    • Regular Maintenance: Regularly inspect and maintain the suspension components.
    • Adjust Suspension: Adjust the suspension settings to suit your riding style and weight.

Frequently Asked Questions

  • Is the W650 a reliable motorcycle? The W650 is generally reliable with proper maintenance, but the bevel gear requires special attention. Regular oil changes and using the correct oil are crucial.

  • How often should I change the oil on my W650? It is generally recommended to change the oil every 3,000 miles or annually, whichever comes first. Consult your owner's manual for the specific recommendation.

  • What type of oil should I use in my W650? Use a high-quality, motorcycle-specific 10W-40 or 20W-50 oil that meets the JASO MA or MA2 specification. This ensures proper lubrication of the engine and clutch.

  • Is the W650 a good beginner bike? The W650 can be a good beginner bike for experienced riders with some mechanical knowledge. The weight and handling are manageable, but the potential maintenance issues should be considered.

  • Are W650 parts readily available? Some parts are readily available, while others can be difficult to find, especially for older models. Online retailers and specialized Kawasaki parts suppliers are your best bet.

The W650: A Classic with Character (and Quirks!)

The Kawasaki W650 is a charming motorcycle that offers a unique riding experience. While it's not without its potential problems, particularly the bevel gear issue, diligent maintenance and proactive care can minimize these risks and allow you to fully enjoy this classic-inspired machine. Remember to listen to your engine and address any potential issues promptly to keep your W650 running smoothly for years to come.