5 Most Common Kawasaki Z750 Problems (What to Do About Them)

The Kawasaki brand is synonymous with powerful engines that can give its owners a lot of thrill, and the Kawasaki Z750 is no exception to that notion. It is a popular choice amongst the brand’s critics and enthusiasts and for goof reason too. However, like most motorcycles that have to obey the laws of physics, it is prone to having problems and today we’ll be taking a look at what some of those are and how to best deal with them. Let’s find out more.

Table of Contents

What Is The Kawasaki Z750?

The Kawasaki Z750 is a popular naked motorcycle model manufactured by Kawasaki Heavy Industries since 2004. It is a mid-range motorcycle intended for daily commuting and recreational riding. The Kawasaki Z750 line includes several variants to suit different needs. So no matter what you want to use the motorcycle for, you can be sure you’ll get one for your specific needs.

Kawasaki Z750 Problems

1. Overheating/ Cooling Issues

Overheating is a very serious problem for most vehicles with internal combustion engines and it can be caused by;

  • A faulty radiator
  • A damaged water pump
  • A malfunctioning thermostat

Troubleshooting The Overheating/ Cooling Issues

  • First check the coolant level and refill if low and then inspect the radiator for leaks or damage and test the thermostat to ensure it’s opening properly. You may need to replace either or both components.
  • The water pump circulates coolant and can fail preventing flow so replacement is required to restore proper coolant circulation and temperature regulation.
  • A blown head gasket can also cause overheating by allowing coolant to enter the cylinders so replacing the head gasket will be need to fix the issue.

2. Stalling And Rough Idling

Another problem Kawasaki Z750 owners report is engine stalling and rough idling. This refers to when the engine sputters, struggles to stay on or turns off unexpectedly at stops. Several factors can contribute to this problems including;

  • Malfunctioning fuel injectors
  • Clogged or dirty air filters
  • A faulty throttle position sensor

Troubleshooting The Stalling And Rough Idling Problem

  • You need to have the injectors tested and cleaned or replaced by a professional mechanic to avoid this problem..
  • Check the air filter and replace if it looks overly dirty or damaged. A new and clean air filter will often improve idle quality and prevent stalling.
  • The throttle position sensor tells the engine how much fuel and air is needed based on the throttle position. If this sensor fails or sends incorrect signals, the engine may not receive the proper fuel-air mixture, especially at low speeds, potentially causing rough idling or stalling. Therefore you need to have the throttle position sensor tested and a replacement may be required.

3. Malfunctioning Fuel Injection System

The fuel injection system is responsible for delivering fuel to the engine. If it malfunctions, your Kawasaki Z750 may experience issues many other problems that will be difficult to deal with. This is usually caused by;

  • Faulty fuel injectors
  • Dirty or clogged fuel filters
  • A damaged fuel pump

Troubleshooting The Malfunctioning Fuel Injection System

  • You first need to try using a fuel injector cleaner additive with your fuel to clear any clogs. If the problem persists then you may need to replace the fuel injectors so you should consult your Kawasaki dealer for replacement parts.
  • You need to eeplace the Kawasaki Z750’s fuel filter every 10,000 to 15,000 miles to keep your fuel injection system in good working order.
  • Unfortunately the only way to fix a fuel pump is to replace the fuel pump. Have a certified Kawasaki mechanic inspect and test the fuel pump to properly diagnose and replace this critical part.

4. Excessive Vibrations

Excessive vibrations are a common issue with the Kawasaki Z750. As the motorcycle ages many of its components can start to wear out or loosen, causing increased vibration levels. There are a few potential causes of this like;

  • Faulty motor mounts
  • An unbalanced driveshaft
  • Faulty swingarm bushings
  • Faulty wheel bearings

Troubleshooting The Excessive Vibrations Problem

  • You will need to have the motor mounts inspected and replaced because worn or damaged motor mounts cannot properly isolate engine vibration, transmitting more to the frame and rider.
  • The drive shaft on the Kawasaki Z750 should be checked regularly and rebalanced or replaced when needed.
  • The swingarm pivots on bushings, allowing the rear wheel to move up and down so you will need to have the swingarm bushings tested and replaced if their condition is found to be deteriorated.
  • If the bearings feel loose or make grinding noises when the wheel spins then they likely need a replacement to restore a smooth ride.

5. Electrical Problems

Common electrical problems with the Kawasaki Z750 motorcycle can be daunting to deal with since the motorcycle requires electrical power to essentially work. These problems are usually caused by;

  • A faulty starter relay/ solenoid
  • A faulty voltage regulator

Troubleshooting The Electrical Problems

  • A starter relay is responsible for starting the engine by providing a high amount of current to the starter motor. If you turn the key and hear a clicking sound but the engine does not turn over, the starter relay is malfunctioning and needs a replacement.
  • The voltage regulator helps maintain a steady flow of electricity to power components like the engine management system, gages, lights and more. If either or none of these components are working then they need to be replaced.
  • Be sure to seek the help of a professional mechanic if you’re having any problems dealing with these troubleshooting methods.

How To Prevent Kawasaki Z750 Problems

  • Be sure to inspect and replace the air filter regularly because a air filter allows for proper airflow and prevents dirt and debris from entering the engine.
  • Check tire pressure and tread wear regularly and inflate or deflate as needed.
  • Inspect brakes for wear and replace pads as needed. You should replace brake pads once they reach a thickness of 1/4 inch or less.
  • Lubricate the drive chain to prevent binding, snapping, or uneven wear.

How Reliable Is The Kawasaki Z750?

The Kawasaki Z750 is generally a dependable and reliable motorcycle, as are most Japanese bikes, with an average reliability rating.

How Much Does It Cost To Insure A Kawasaki Z750?

Insurance rates for the Kawasaki Z750 will vary depending on factors like your age, riding experience, location and coverage levels selected. On average however, you can expect to pay between $500 to $1,500 per year for full coverage insurance on a Kawasaki Z750.


After reading about the problems that commonly arise with the Kawasaki Z750, you should feel better equipped to handle any that may come your. While no motorcycle is perfect, being curious and active, and addressing the problems early can help maximize your enjoyment of this powerful street bike. With regular maintenance, quality aftermarket parts when needed, and expert diagnosis of any warning signs, your Kawasaki Z750 can provide many miles of thrilling riding.