The motor is the component that provides the initial impulse to the entire mechanism. It converts battery power into rotational force for the gearbox. Choosing the right motor determines trigger response, rate of fire (ROF) and the motor’s ability to handle heavy springs without struggle. Upgrading the stock motor is one of the most effective steps to improve the feel and performance of your AEG.
Torque vs Speed
Motors split into two philosophies: High Torque and High Speed. High Torque motors deliver raw rotational force from the first turn — they excel at pulling heavy springs and give snappy trigger response. High Speed motors rev to higher RPMs but have less torque and struggle under heavy load. Today, combining a High Torque motor with high-speed gear ratios is often the best practical approach.
When to choose High Torque
- For heavy springs (M120+).
- For DMR/sniper applications that require pulling strong springs.
- For immediate trigger response in semi-auto engagements.
When to choose High Speed
- For pure ROF in CQB with lighter springs (M110 or lower).
- If you accept higher current draw and heat in exchange for RPM.
Short type vs Long type
Motor length is a matter of compatibility. Long type motors are common in most M4/M16/MP5 platforms; short type motors fit AK, G36 and certain bullpup designs. They are not interchangeable — pick the correct form factor for your replica.
Construction & features
- Magnets: stronger magnets increase torque.
- Windings: affect torque vs RPM characteristics.
- Pinion gear: hardened steel pinion is essential for longevity.
- Internal bearings: improve efficiency and lifespan.
Accessories & adjustments
- Motor height adjustment: critical screw that sets pinion-bevel mesh. Find the point of smoothest, quietest operation.
- Heat sinks / cooling: useful in extreme use cases to manage temperature.
- Motor cages/grips: stabilize the motor and improve alignment.
When to upgrade
- If you move to faster gear ratios and need improved ROF.
- If the stock motor struggles with a stronger spring (M120+).
- If you want markedly improved trigger response.
Maintenance & troubleshooting
- Check brushes for wear and replace if performance degrades.
- Monitor operating temperature — overheating signals overwork or poor mesh.
- Listen for unusual sounds: whining or grinding indicates motor height issues or pinion wear.
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FAQ
What motor should I use with an M120 spring?
High Torque motor with strong magnets, hardened pinion and correct motor height adjustment.
Can I run a high speed motor with an M130 spring?
No. High speed motors often lack the torque required and can overheat or stall.
How do I set motor height correctly?
Install the motor, turn slowly and listen. Adjust to the position with the smoothest, quietest engagement between pinion and bevel.
TL;DR
Choose a High Torque motor for most upgrades — it improves trigger feel and handles strong springs. Match type (short/long), use hardened pinions and fine-tune motor height for best results.
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CTA: Find the motor that fits your build and upgrade your replica today.
