Top 4 Kawasaki Z900rs Problems With Quick Solutions Discussed

Kawasaki Z900RS is a classic motorcycle that riders love for its retro bike-ripping style. The beast delivers serious performance on the street with its liquid-cooled 948cc engine. The engine produces potent torque and is made for brilliant on and off-road riding.

However, with time, Z900RS has seen a few problems that need quick addressing. Or else, you need to compromise your riding comfort and safety with Z9000RS. Also, when buying a motorbike, knowing these problems will help you know its actual condition. Top Kawasaki-Z900RS problems include throttling inconsistency, uncomfortable seats, slow heat dissipation, and transmission problems.

Here, we will delve into the most common Kawasaki Z900rs problems and explore their causes and potential solutions. Whether you are a proud owner of this model or are considering purchasing one, it is essential to be aware of these electrical issues to make an informed decision.

Top 4 Kawasaki Z900rs Problems

Top Kawasaki Z900RS Problems With Solutions

Top Kawasaki Z900RS Problems With Solutions

The Kawasaki Z900RS is a brilliant motorcycle on paper. Its front and rear suspensions are completely adjustable and have intelligent traction control. The engine generates 70 pounds of torque and 100HP power for brilliant rides. Nonetheless, in practical riding experience, the RS Kawasaki Z900rs problems. Addressing them will help you with safer and smoother rides.

Problem 1: Problematic Brake Design

Problematic Brake Design

Only the 2018 models of the Kawasaki Z900RS have seen this problem. Kawasaki had to recall 1173 units of the Z900RS and Z900 for these defective brakes. The recall happened due to the closeness of the rear tire brake wires and rear brake assembly wheel. They were so close that the wire could touch the wheel sensor wires and get damaged quickly. Also, it would damage the brake hose. These consequences brought three major braking problems:

  • The damaged wire would result in faulty speedometer reading.
  • Due to the damaged wires, the motorcycle will compromise with the ABS blend of performance.
  • A damaged hose will cause the brake fluid to leak through the damage. Thus, you will need more brake fluid leakage than usual.

The problem was first addressed in Europe, and since November, Kawasaki has recalled the Z900RS with a defective brake design.


The Kawasaki Z900rs has been known to have some gearbox issues related to its brake design. One of the main problems riders report is the lack of initial bite and inconsistent braking performance. This can be a safety concern, especially during sudden stops or emergency situations. To address this issue, Kawasaki has released a solution in the form of an improved brake system.

The updated design includes revised brake calipers, pads, and lines to enhance the overall braking performance and provide a more responsive and reliable braking experience. Riders who have installed the problematic brake design solution have reported significant improvements in braking performance, with better initial bite and increased confidence in the bike’s stopping power.

Problem 2: Not-So-Comfortable Seat

Not-So-Comfortable Seat

Z900RS has a good seat, undoubtedly. You will find it outstanding while riding through the city streets as you twist and turn the motorcycle. However, the seat is a little stiffer than most people. Notably, during long rides, the stiffness of the motorcycle becomes readily apparent.

A few riders have reported numbness and fatigue during long rides with the Z900RS. We still need to find out why this problem happened. However, experts suggested that the stiffness of the seat can be a reason. So, the accessory seat feels less comfortable than it should be.


You may get an aftermarket seat for the Kawasaki Z900RS. You can get the aftermarket seat to replace the stock seat. Also, we recommend you ride the motorbike in cities mostly. It is a café racer and not made for long rides. Even if you need to go on long rides, take a break occasionally. It should remove your numbness and save you from fatigue.

If you decide to replace the stock engine braking, consider the BAGSTER Kawasaki Z900 RS 2018 2022 motorcycle comfort seat. It has a beautiful green lining, and the Z900RS logo embossed. Also, it is soft and offers brilliant riding comfort. You can replace it at home following the manual.

Problem 3: Bike Getting Hot Sooner Than Expected

Z900RS comes with a liquid-cooled 998CC engine. The engine is expected to deliver reliable and high performance in all conditions. Sadly, many riders have reported its high-temperature problem. The riders reported that their Japanese bike was running at a high temperature within a few miles of rides. It is a twin shock since the liquid-cooled engine is supposed to remain cool.

More surprisingly, people found the engine getting hot even in normal conditions. And in warmer regions, the problem became too acute. Thankfully, the high-temperature problem didn’t make the bike unusable. It was mainly because of periodic maintenance.

Reasons Of Z900RS Is Running Hot

The Kawasaki Z900rs is a highly acclaimed motorcycle with a reputation for its exceptional performance and stunning design. With its roots deeply embedded in the iconic Kawasaki Z1, the Z900rs pays homage to the classic retro style while incorporating modern technology and engineering advancements. When your Z900RS gets hot and won’t dissipate the heat soon, it can be due to 3 primary reasons. These are:

  • Inadequate Engine Oil: The engine oil level has gone too low. It happens when you keep the engine oil the same for an extended period.
  • Low coolant Levels: The engine oil and water coolant are crucial for the motorbike. It is a liquid-cooled engine and needs an optimal coolant level to run cold.
  • Defective Fuses: Defective fuses of the thermal sensor may also cause the engine to heat up too high. If the fuse gets damaged, it will show wrong readings on the dash instrument of your Z900RS motorcycle.


If you consistently experience Z900RS getting too hot, immediately check the temp-gauge. If it reaches “1 bar”, it must be concerning. Thus, check both the coolant and engine oil levels. You will need an oil gauge to measure the oil and coolant levels.

If the engine and coolant level is below the “L” mark on the gauge, fill up the tank ASAP. It is suggested that you check the coolant level every 100 miles. So, it helps you maintain the bike quickly. You should change the water coolant for the engine once every 15000 miles.

  • You first must remove the radiator cap and inspect the coolant condition inside the tank.
  • If there’s any remaining coolant and engine oil, drain it with a hose. Or, turn the bike to the side to drain the coolant water.
  • Reattach and flush the connecting hose to properly drain the tank reservoir and coolant. You should use commercial flushing compounds for the best results.
  • Finally, run tap water to remove traces of the older coolant and flushing compound. Let the tank range reservoir dry.
  • Now, fill it up with the new engine oil and coolant. You may use the Samco Silicone Coolant Kit to finish the coolant replacement task.

Plus, check for any loose wiring of the temp-gauge and thermal sensor. Replacing the fuse will solve the engine heating problem if the fuse is damaged.

Problem 4: Transmission And Low-Idling Problem

Transmission And Low-Idling Problem

Likewise, uneven and problematic transmission is also a common Z900RS problem in most motorcycles. As you shift the gear, it feels clunky. Also, you will experience jerking of the motorcycle, especially when you ride the motorcycle for an extended period.

Moreover, many riders have reported a loud banging noise while shifting to the 6th gear. During transmission, this sound will be louder. Last but not least, inaccurate and problematic transmission will cause low-idling issues.

As you start the engine, it will turn off after a while. It happens after the engine remains idle speed for a few moments. Engine idling problem occurs due to inadequate power supply to the engine.

Reasons And Signs

At the heart of this machine lies a formidable 948cc inline-four engine, delivering a thrilling riding experience with its impressive power and torque. The Z900rs combines power and control effortlessly, offering exhilarating acceleration and smooth handling on city streets and open highways.

The refined suspension system ensures a comfortable and stable ride, while the advanced braking system provides precise stopping power, instilling confidence in the rider. Low-idling, inadequate engine power, and transmission problems will occur for different reasons. A few of the most responsible reasons are:

  • The gear change will feel clunky. Mainly irregular maintenance of the motorcycle is the primary reason for it. You will also see louder banging noise.
  • You may be running the motorcycle with downgraded oil quality. Also, low coolant levels will cause transmission problems.
  • Low-idling of the engine happens due to faulty fuel systems and injectors. Also, low-quality fuel and a clogged air filter will stop the engine from getting adequate power.


The aesthetic appeal of the Z900rs is undeniable. Its timeless design elements, such as the teardrop fuel tank, round LED headlight, and sculpted bodywork, create a distinct and eye-catching look.

Every detail has been meticulously crafted, from the stainless-steel exhaust system to the retro-inspired instrument cluster, making the Z900rs a true work of art on wheels. You need to take different measures depending on the reasons and signs of the transmission and idle-engine problem. Check these troubleshoots.

  • Use a higher-grade oil for your Kawasaki Z900RS. In most cases, it will provide more power to the engine and help it run smoothly.
  • Check the liquid coolant level and replace it if need be. Also, always use the recommended coolant for the transmission system. You should also use proper additives to safeguard the gears and metal parts of the motorcycle.
  • Look at the air filter and fuel injectors. They often become clogged and might result in a drop in fuel injection quality. Thus, you must maintain the motorcycle timely to cleaning the fuel injectors and air filters.
  • If you have a new Z900RS, the gear change will feel clunky for the first few hundred miles of rides. It happens as the gear and its metal parts expand and adjust. So, it is not necessarily a concerning problem.

5. Cooling System Problems

Cooling System Problems

Cooling system problems in the Kawasaki Z900rs can arise due to various reasons. Some common issues include overheating, coolant leaks, and radiator blockages. Overheating can occur when the engine is under excessive load or low coolant levels.

It is important to regularly check the coolant levels and ensure that the radiator is clean and free from any debris or blockages. Damaged hoses, loose connections, or a malfunctioning water pump can cause coolant leaks. If you notice any coolant dripping or pooling beneath your motorcycle, it is important to address the issue promptly to prevent further damage to the cooling system.


The reliability rating of the Kawasaki Z900rs is a topic of concern for many riders. Owners of Kawasaki Z900rs may find that the service costs are higher compared to other motorcycles in the same class. The tire on my Kawasaki Z900rs is showing signs of wear and tear. Cooling system problems can occur in motorcycles like the Kawasaki Z900rs. Here are some solutions to address these issues:

  1. Regular Maintenance: Follow the manufacturer’s recommended maintenance schedule. This includes flushing and replacing the coolant at the specified intervals.
  2. Check for Leaks: Inspect the cooling system for any signs of leaks, such as coolant puddles or stains. If you notice any leaks, repair or replace the damaged components promptly.
  3. Clean The Radiator: Over time, it can accumulate dirt, debris, and bugs, reducing efficiency. Regularly clean the radiator to improve air circulation and prevent overheating.
  4. Check The Coolant Levels: Make sure the coolant levels are within the recommended range. If the levels are low, top up the coolant with the appropriate type and mixture specified in the owner’s manual.
  5. Inspect The Radiator Fan: Ensure that the radiator fan is functioning properly. If it is not working or running at a reduced speed, have it checked and replaced if necessary.


Kawasaki Z900RS problems mainly occur due to improper and irregular maintenance. When you change the engine oil and water coolant timely, its transmission, gear shifting, engine-idling, and heating problems will not occur. Henceforth, we suggest you maintain the motorcycle timely. Always use high-grade engine oil and recommended water coolant and additives.

And for problems with the brakes, you can claim a refund or replacement. Apart from these minor issues, the Kawasaki Z900RS is an outstanding motorcycle. Its classic ripping style and café racer design make it a perfect choice for city rides.


1.Is The Z900RS Reliable?

Ans: Yes, the Z900RS is generally considered to be a reliable motorcycle. It is built by Kawasaki, a reputable manufacturer known for producing durable and long-lasting beautiful accessorized bikes.

2.Is The Z900RS Too Fast?

Ans: No, the Z900RS is not considered too fast. While it is a powerful motorcycle with a 948cc engine, it is designed to provide a balanced and manageable riding experience.

3.Why Z900RS Is So Expensive?

Ans: The Z900RS is considered expensive due to several factors. It is a high-performance motorcycle with advanced features and technology. It has a powerful engine, top-notch suspension, and high-quality components, contributing to its higher price tag.

4.What Is The Fuel Consumption Of Z900RS?

Ans: The fuel consumption of the Z900RS motorcycle can vary based on factors such as riding style, road conditions, and maintenance. However, on average, the Z900RS has a fuel consumption of around 40-45 miles per gallon (mpg).

5.Is Kawasaki Z900RS Good For Beginners?

Ans: The Kawasaki Z900RS may not be the best option for beginners due to its powerful engine and aggressive riding position. It is designed more for experienced riders who can handle its performance and handling characteristics.

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