M4 Motor + Double Shaft Magnet

The M4 Plus Dual Shaft Motor: Versatility and Performance for Serious Slot Preparations

The M4 Plus long can dual shaft motor (reference CXM204D) is a unit designed for those seeking a motorisation with real customisation potential. Its dual shaft opens the door to multiple transmission configurations, while its long can dimensions (15.5 × 20.5 × 32 mm) place it in the range of motors with generous torque and progressive power delivery.

Main Features

• Format: Long can, 15.5 × 20.5 × 32 mm
• Motor shaft: 2 mm smooth, main shaft length 12 mm
• Dual shaft: allows transmission output from both ends
• RPM at 12V: 18,500
• RPM at 15V: 20,000
• Current draw: 200 mA
• Weight: 330 g/cm (motor torque)
• External magnetic effect: Yes

Behaviour and Performance

With 18,500 RPM at 12V and a contained consumption of 200 mA, this motor operates in a balanced working range: enough muscle for fast tracks, without the excessive consumption that can compromise the life of the braids or the electronics of the controller. The jump to 20,000 RPM at 15V makes it interesting for setups with higher voltage sources, gaining response without losing linearity.

The external magnetic effect is a relevant factor for installation: its influence on traction and, in tight bench configurations, on nearby metal parts must be considered. This behaviour can also be leveraged in setups where some additional grip is sought without resorting to chassis magnets.

Recommended Applications

The dual shaft is the distinguishing feature of this motor compared to single shaft versions. It allows the transmission to be mounted on either side, facilitating adaptation to different chassis and motor positions. This is a special advantage in inline configurations (longitudinal motor, in line with the rear axle) or in custom chassis prototypes where the output side is not predetermined.

It is particularly suitable for:

• Competition builds in categories with moderate RPM limits
• Custom or adapted chassis where the flexibility of the dual shaft adds real value
• Motor replacements in 1/32 scale slot cars that accommodate long can
• Setups where the external magnetic effect is a controllable or even desired factor

Usage Recommendations

Before installation, it is advisable to check that the receiving chassis has enough space for the long can (32 mm in length). With a 2 mm smooth shaft, the pinion attachment should be made with the glue point or pressure screw well aligned to avoid axial play. Given the external magnetic effect, we recommend checking the distance to other metal parts of the chassis during assembly.

To take full advantage of the RPM range at 15V, ensure that the power supply and controller used can support that voltage stably. With braids in good condition and the guide well seated in the slot, the motor's response is clean and predictable.

Frequently Asked Questions

What is the difference between the long can M4 Plus motor and the short can version?

The long can implies greater physical length of the motor (32 mm in this case) and, generally, a slightly higher motor torque. The short can is more compact and fits into chassis with less available space. The choice depends on the destination chassis and the needs of torque versus space.

What does it mean to have a dual shaft?

It means that the shaft exits from both ends of the motor, not just one. This allows the transmission pinion to be placed on the side that best fits the chassis, or even to use both ends in special setups.

What pinions and crowns is it compatible with?

Having a 2 mm smooth shaft, it is compatible with standard 2 mm hole pinions. The choice of pinion/crown ratio will depend on the track and the desired performance: more teeth on the crown for slow tracks with many curves, fewer for fast tracks and long straights.

Can the external magnetic effect interfere with other chassis components?

Yes, it is something to consider during assembly. In chassis with metal parts close to the motor, the external magnetic field can generate small attractions or interferences. In most conventional installations, this is not a problem, but it is advisable to verify it in very tight chassis or with metal benches.

What working voltage do you recommend for regular club use?

For club competition use, 12V is the most common reference and the motor operates in its optimal range of 18,500 RPM. The 15V is more oriented towards tracks with adjustable power supplies where the maximum of 20,000 RPM is sought.

Does it need a break-in period before using it in competition?

Like any brushed motor, a gentle initial break-in — at reduced voltage and in both directions for a few minutes — helps to settle the braids and improve contact with the collector, extending the motor's lifespan and enhancing its performance from the first real use.

The CXM204D is a dual-shaft M4 Plus long-can slot motor delivering 18,500 RPM at 12V and 20,000 RPM at 15V, with a 2 mm smooth axle, 200 mA current draw, and external magnetic effect. Ideal for 1/32 slot car competition builds, custom chassis and inline or anglewinder configurations requiring flexible shaft output.