Kawasaki Ninja ZX-25R Modifications

 Kawasaki is indeed one of the manufacturers that is consistent with the type of motor sport products. Ninja's name, even became one of the species that never disappeared from the sheet portfolio. Since the 2-stroke Ninja, Ninja RR, Ninja 250 cc, now they are trying to innovate with a compact 4-cylinder engine through the Ninja ZX-25R.

Kawasaki Ninja ZX-25R Modifications

The Kawasaki Ninja ZX-25R stole the attention when it appeared at the 2019 Tokyo Motor Show (TMS). How not, the 250 cc Ninja figure, which has been known as 1 or 2-cylinder configurations, is now loaded with 4-cylinders. It promises impressive performance, especially when applied to a quarter liter engine.

Not entirely new, considering that in 1989 the Green Gang released the Kawasaki ZXR-250. One of the competitive iron horses at that time. Thanks to its DOHC 4-cylinder mechanical heart, it is capable of producing 45 hp/15,000 rpm and 25 Nm/11,500 rpm of torque. Broadly speaking, that DNA also flows in the Ninja ZX-25R. Both are armed with the same type of engine and cylinder.

Although there is a common thread, in fact that's all that can be found in the two. Embedding a variety of innovations makes the 4-cylinder Ninja more savage than its predecessor. Imagine, bursts of energy alone reach 50.2 Hp. Meanwhile, the maximum torsional moment is 22.9 Nm, reached at 15,500 rpm engine speed.

Such performance can also be felt by consumers in the country. Even the offer is quite attractive, because it is sold at prices starting at Rp. 96 million, for non-ABS types. As for the most expensive type equipped with ABS, it is pegged at 112.9 million. Pre-orders for the ZX-25R unit have also been opened from 11-12 July 2020, specifically for buyers in the Jakarta, Depok, Tangerang, Bekasi and Serang areas.

Kawasaki Ninja ZX-25R is present in Indonesia with two choices of standard (non-ABS) and Special Edition (ABS SE). The SE type has additional color graphics as well as several features and accessories. These include: ABS brakes, two-way KQS, pillion seat cover / single seat cover, smoked windshield, frame slider, and wheel rim tape. Also in terms of color choices, this type is varied with the availability of Lime Green/Ebony, Metallic Spark Black/Pearl Flatdust White and Candy Plasma Blue/Metallic Spark Blue options. The price was released at Rp. 112.9 million. That option cannot be found on the standard ZX-25R which only provides one color (Metallic Spark Black) only. Only minus ABS and accessories, consumers can ask for her hand with a much cheaper tag of only Rp. 96 million.

At first glance it looks like the Ninja 250 2-cylinder version. Call it the application of a tapered LED type dual headlamp. The difference is that the ZX-25R lighting system gets DRL at the bottom corner of the lamp housing. The striking difference is also seen due to the presence of ram water (air pipe) at the top of the lighting system, then the shape of the windshield which is more sloping and the mirrors are short. Emphasizes its sporty character. In addition, the aerodynamic body cover under the main lighting and the alignment of the sharp front fender forms.

On the side, the body of the ZX-25R is not completely closed. Obviously, the manufacturer deliberately wanted to exploit high tensile steel trellis frames. Including the selection of underbelly exhaust to highlight the banana swingarm model. Even so, it seems there is no significant change in the driving position. Like the 2-cylinder Ninja, the 4-cylinder version also uses clip-on handlebars, motor sport-style foot steps and multi-level seats. The difference is, the gas tank cover belonging to the ZX-25R feels easy for racing purposes. That's because of its flat shape to support the rider's chest and helmet.

It's just that it's very heavy. The total ZX-25R is as fat as 182 kg (ABS type), not to mention if the tank is supplied with a maximum volume of 15 liters of gasoline. But in terms of dimensions: 1,980 x 750 x 1,110 mm (W x W x H), the ZX-25R is still ideal when compared to other 250 cc sports competitors. He is also the lowest fighter because he has the lowest distance (ground clearance) of 125 mm. Again, competitors at the same level are still higher than him. Such a design must be friendly to Indonesian motorists, especially with a seat height of 785 mm

In order to control the dimensions, weight and performance beast, the ZX-25R is equipped with a steel trellis chassis. Claimed to support the character like a supersport. In fact, specifically the ingredients such as the center of gravity, swingarm pivot position, engine axis, caster angle, were inspired by the chassis of the Kawasaki Ninja ZX-10R - one of Kawasaki's flagship mounts in the World Superbike (WSBK) arena.

As a support, infiltrated shock absorbers upside down (USD) with a diameter of 37 mm in front. SFF-BP (Separated Function Fork - Big Piston) technology. Kawasaki calls the suspension specs from the Showa suitable for use on the race track, but also ideal for daily use. Its performance is in synergy with the 110/70-17 wheel circumference of the Dunlop GPR300-style radial tires. For the rear wheels, use size 150/60-17. Then to dampen the stern area, a single horizontal back link shock absorber was appointed.

Regarding the speed stop, the ZX-25R uses disc brakes with monobloc radial calipers at the front and a large disc circumference at the rear. In the top type there is an ABS braking system. This is one of the differentiators with non-ABS units. Because it does not have an anti-lock brake system, the standard ZX-25R has a lighter weight of 180 kg (2 kg difference from the ABS SE type).

During the launch, PT KMI for the first time released technical data regarding the engine. The ZX-25R is written using a DOHC 4-cylinder inline 16 valve engine with a capacity of 249.8 cc. Overbore type, identical to the existing Ninja (2-cylinder version). But the Ninja ZX-25R has a bore x stroke: 50 x 31.8 mm and a compression ratio of 11.5:1. This concoction produces 49.3 hp/15,500 rpm and 22.9 Nm/14,500 rpm of torque. However, that record could change if the Ninja ZX-25R's water ram is active (speed 100 kph). It is claimed that power can be boosted up to 50.2 HP/15,500 rpm or 51 PS (50.9 PS rounding).

Thanks to that machine, the ZX-25R is able to reach a top speed of up to 187 kph. The nick, which is also the result of the translation of the application of a quick shifter (upshift and downshift), is integrated into the 6-speed transmission which has been infiltrated by Assist and Slipper Clutch. However, the device is only found in the highest type (ABS SE type). Even so, that doesn't mean non-ABS unit buyers can't fully experience the ZX-25R's performance. Because both models are equipped with Power Mode in the form of full power or low power mode options. Through this selection, the power and response of the gas opening will be adjusted automatically. If you want to feel the maximum scream, you can select the 'F' mode. Instead, try the 'L' mode if you want to drive more relaxed.

Especially for low power, it can be used when driving the ZX-25R in unfavorable weather conditions, such as rain. Plus, there is also Kawasaki Traction Control (KTRC). For information, the Ninja ZX-25R is the first 250 cc motorcycle to apply this system. And there are three settings (three rider selectable mode) to suit the driving situation and rider preferences. The use of these features is supported by the presence of Electronic Throttle Valves (ETV), which are equipped with a high-spec ECU. That way, the engine can control the supply of fuel (via fuel injectors) and air (from throttle valves) sent to the combustion chamber.

Popular Modifications Kawasaki Ninja ZX-25R

Most buyers of the Kawasaki Ninja ZX-25R really cult the sporty aura on their vehicles. Maximizing by following the original nuance, is an orientation that is often used as a benchmark for owners.

There are various ways, by adding a variety of performance support devices to hook a more savage sensation. There are also those who focus on modifications to the appearance, to strengthen the impression of the motor racing they covet. However, not a few who only modify it in a minimalist way, to maintain its originality as much as possible, because they are very satisfied with what is offered. 

Modif Body Part

Even since the Ninja ZX-25R has not been sold, Kawasaki Motor Indonesia has introduced a version wrapped in carbon fiber material. No kidding, Japanese tuner A-Tech was asked to prepare this super lightweight body part. Materials like this can be used for fairing components, chassis, chassis cover, chain cover, and even swing arm. The purpose of this type of modification, of course, is none other than to reduce weight and improve performance.

Minimalist Engine Upgrade

For minor modifications in the performance sector, Ninja ZX-25R owners can choose to maximize combustion. You do this by increasing the air supply to the cylinder chamber, or simply optimizing ignition. To increase the supply of air, consumers can choose an air filter with stainless steel material with a density that is more tenuous than the standard. Outwardly, there are two models we found, density 45 micron and 70 micron. This is much more tenuous than the standard which is only 15-25 microns.

ECU Tuning

Manipulating the ECU system is often an option for owners who want to improve the performance of their motorbike without changing a lot of innards first. The trick is to install a piggy back so that you can manipulate the data and set it further. Usually this device is sold together with tuning services on the dynamometer, so that the desired output can be directly felt.

Accessories for Kawasaki Ninja ZX-25R

Because the Kawasaki Ninja ZX-25R is a promising motorbike in its class, aftermarket brands are also competing to prepare a variety of accessories to complement the needs of the owners.

If you are still having trouble finding it in Indonesia, don't worry, many brands from abroad also have a variety of accessories collections. Because this bike is intended for the global market.

Carbon Single Seater

In standard conditions, the Ninja ZX-25R is already using a seat cover to cover the passenger seat. However, the material prepared is still made of ABS plastic. If you want a more luxurious material such as carbon, there are those that are sold in the market with a price tag of Rp. 1.2 million to Rp. 2 million. The fun thing is that these components are arranged with original ZX-25R spare parts, so they are plug and play.


The standard wheel rubber of the Kawasaki ZX-25R is the Dunlop Sportmax GPR300. This tire has a radial wall configuration with sizes of 110/70 (front) and 150/60 (rear) on 17-inch alloy wheels. The option for the ZX-25R of course we recommend competitive sports models from well-known brands, such as the IRC Fasti Pro or if the orientation is daily RMC 810 (Rp 2-3 million a pair). If you want a more prestigious brand, you can choose Bridgestone with the Battlax BT39 or S22 model (Rp 2.5-3.5 million a pair). Another option is the Michelin Pilot Power 5 series or RS series. Just prepare a pocket of IDR 3.5-4 million a pair to redeem it.

Slider Frames

The standard variant of the ZX-25R is priced at IDR 98 million, not yet using a frame slider. This component is considered important to protect your motorcycle. Not only the fairing is protected, but also engine components and other vital parts. The price of the original part touches Rp. 2 million, but don't worry, there are aftermarket brands with no less good quality with a price tag of around Rp. 1 million.

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