Kyosho Mini-Z MR04 RWD Jaguar XJR-14 LM 1991 No.4 (W-Lm/Kt531p)
Key Specs
About this product
Description
Latest high-performance MR-04 chassis
Now the standard MINI-Z RWD model!
Enjoy the full experience of high-performance R/C car racing right out of the box; just insert batteries into the car and transmitter. This is the simplicity of Kyosho Readyset packages. The small scale of the MINI-Z Racer is ideal for driving indoors and for people just becoming familiar with R/C cars. This MINI-Z RWD Readyset includes a renewed 2-wheel drive chassis at its core. Previous Readyset packages incorporated the 3rd generation MR-03 chassis, but the new RWD Readyset includes the 4th generation MR-04 chassis that was first released in 2023. While retaining some basic elements of the MR-03 design, the new MR-04 demonstrated its lower center of gravity and remodeled steering design with blistering speed and excellent handling in the top-of-the-line EVO2 debut model. The MR-04 chassis is mounted with R/C system and features a completed body finished to display model standard. This Readyset includes the same standard MR-04 chassis as other high-end MR-04 models and includes user-friendly 130-class brushed motor and the reliable Syncro KT-531P pistol grip transmitter. Just insert 4 x AAA alkaline batteries into both the car and the transmitter, and you’re ready for the fun to begin. High-performance comes straight from the standard setup, but you can tune up for elite-level performance with a wide range of MINI-Z optional parts. With its dynamic maneuverability display model finish, the updated MR-04 chassis takes the authentic R/C experience to a higher level.
※The separately sold LED light unit set (No.MZW429R) cannot be installed on the JAGUAR XJR-14 No.4 LM 1991.
●Authentic EP (electric) small scale R/C car that can be driven indoors.
●Readyset package includes fully assembled chassis, body and transmitter.
●Includes ultra reliable multi-function Syncro KT-531P transmitter.
●Features the MR-04 chassis, a major evolution from the previous MR-03 model.
●Includes high-quality painted body with decals applied, finished to display model standard.
●Compatible with all bodies for the MINI-Z racer series. *Motor case and differential gear assembly suitable for the body are required separately.
●Geared differential (gear diff) delivers smooth cornering.
●Full ball bearing specifications
●Can be fitted with an optional gyro unit (MZW711) for even easier control. Gyro sensitivity can be adjusted using the volume on the chassis.
●Compatible with wide range of MINI-Z Racer optional parts so you can enjoy tuning and enhancing your model.
While retaining the best aspects of the MR-03, the lower center of gravity of the new MR-04 delivers significant performance improvements. The easier control of the MR-04 makes it an ideal introduction to R/C cars.
While retaining the best aspects of the MR-03, the lower center of gravity of the new MR-04 delivers significant performance improvements. The easier control of the MR-04 makes it an ideal introduction to R/C cars.
New front knuckles with integrated kingpins reduce scrub by 1.5mm on each side compared to the MR-03, realizing sharper and more linear control. The change to 3mm inner diameter ball bearings also reduces rotational resistance.
Front suspension dynamically aligns the camber angle with movement of the upper arm to maintain optimal tire contact during cornering. Revised caster angle also delivers improved steering response.
The car is powered by four AAA alkaline or rechargeable nickel-metal hydride batteries. The batteries are mounted lower than the MR-03, lowering the center of gravity of the entire chassis to deliver improved cornering stability and straight-line handling.
The rear suspension uses a coil spring damper to cushion shocks from the road surface and improve driving stability. It can also be upgraded to an optional oil-filled shock absorber.
Flexibility of the T-bar rear suspension plate that holds the entire rear pod, including the motor and rear axle, produces excellent suspension effect. Optional parts are also available in FRP and carbon.
In 2025, All axles are equipped with low rotational resistance ball bearings as standard. The same size ball bearings are used for both front and rear for spare parts efficiency.
When changing from the standard body, a parts set is included to change the front tread (vehicle width) to match the non-standard body to be installed. Rear tread can be changed by changing the wheel offset.
Includes Syncro KT-531P transmitter with a steering wheel that mimics the steering wheel of a real car and pistol-grip throttle (speed control). Adjust the neutral position of steering and throttle with trims, as well as steering angle with dual rate adjustment. It is also possible to operate in training mode with a reduced vehicle speed (training mode is the default setting).
Technical Data
<Technical Data>
– Length 177.0mm
– Width 79.5mm
– Height 44.0mm
– Chassis MR-04W-LM
– Wheelbase 102.0mm (LL)
– Tread F:67.5mm R:65.0mm
– Front Wheel Offset Narrow +3.0mm
– Rear Wheel Offset Wide +1.0mm
– Weight 168g
– R/C System Syncro KT-531P
Kit Contents
<Readyset Contents>
– Factory assembled chassis
– Pre-painted body, complete with markings
– 2.4GHz Perfex KT-531P 2.4GHz transmitter
– Front tread adjustment parts set
– Pinion gears 6T, 7T, 8T, 9T
– Spare nuts
– Wheel wrench
– Pinion gear tool
– Tires, wheels
Required For Operation
<Required for Operation>
– AAA-size alkaline batteries x 4 for chassis.
– AAA-size alkaline batteries x 4 or Ni-MH batteries x 4 for transmitter
What's in the box
- P transmitter.
- chassis, a major evolution from the previous MR-03
Frequently Asked Questions
The Mini-Z MR-04 is suitable for both casual enthusiasts and experienced competitors. As a ready-to-run model, it requires no assembly and arrives fully built, making it accessible to beginners, though the tuning options (gyro units, suspension upgrades, pinion gears) mean it can grow with your skills.
The product description does not specify which batteries are required or whether any are included in the box. You'll need to check the manual or product specifications with the retailer to confirm the battery type and if a charger is supplied.
The Mini-Z arrives fully assembled and ready to run, including the MR-04 RWD chassis with pre-painted Jaguar XJR-14 LM body, a 2.4GHz Perfex KT-531P transmitter, front tread adjustment parts, and multiple pinion gears for performance tuning.
This is a 1/28 scale micro-scale RC car, making it very compact and ideal for indoor or tight spaces. The exact dimensions are not listed, but 1/28 scale models are amongst the smallest ready-to-run options available.
Yes, the MR-04 platform supports upgrades including optional gyro units for advanced control, oil-filled suspension dampers, and full ball bearing specifications. Multiple pinion gears are included to allow fine-tuning of performance characteristics.

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