Entry level brushless motor from Solink. These motors have great heat efficiency, reliability and performance from either 7.4v or 11.1v. According to Solink you can use AB and Precock, and state their motors are fully compatible with all ETU's, currently no reported issues.
Speed Controller
Whilst the LITE edition doesn't have an external speed (20% reduction) switch, you can access this by removing the 4 screws on end cap and using a pin switch the selector.
Here's some blurb from the official Solink website:
★ Extended Durability: Designed with a stationary coil, the Solink brushless motor is built to last. This design significantly extends its lifespan compared to traditional brushed motors.
★ Strong Torque: With its high torque capacity, the Solink brushless motor can effortlessly handle powerful springs, making it a robust and reliable choice for demanding applications
★ CNC shell and D Type Pinion Gear : CNC shell can greatly help heat dissipation while D type pinion gear design is compatible with most current Airsoft brands.
The hardness rating of the pinion gear is measured at HRC35-38.
The shaft sleeve bearing specifications are as follows: outer diameter of 7.938 and an inner hole diameter of 3.175.
Solink haven't themselves said given any ETU guidence / what to avoid. I've been pushing them but still nothing, so for the time being I would avoid Active Breaking at the least.
Statistics with 11.1v:
AT NO LOAD
SPEED =34950RPM
CURRENT =2.0A
AT MAXIMUM EFFICIENCY
EFFICIENCY=72.6%
SPEED =24747RPM
TORQUE =416 G.CM
CURRENT=16.8A
OUTPUT =138WATTS
AT MAXIMUM OUTPUT
EFFICIENCY=45.4%
SPEED =17500RPM
TORQUE =1995G.CM
CURRENT =63A
OUTPUT = 338 WATTS
Motor Grip Modification:
I'll list up ones here when I start getting reports in but assume anything that isn't "standard" you'll need to modifiy the motor grip plate.
IMPORTANT
1. Do not power the motor with the cables reversed. Always check this.
2. Solink state that this is the most ETU compatible motor on the market and can be used with AB should you need to, no reported issues currently.
3. As with all motors if you get a gearbox lock-up, don't keep your finger on the trigger trigger. Use common sense.
4. If changing the pinion yourself do not force it on, do not whack with a hammer! Too much force will damage the rear bearing or controller. There's some good guides on YT on how to remove pinion gears on brushless motors.