Mini 4WD Sprint Dash motor, broken in. If you purchase multiple motors, we will offer a discount of 200 yen per additional item! Example: 2 items purchased together for a total discount of 200 yen, 3 items for a total discount of 400 yen. Broken in with forward rotation. RPM: 41182rpm No-load current consumption: 1.1A Measurement conditions: Measured after more than 24 hours after break-in, with the motor's temperature naturally cooled in a place not exposed to sunlight, and after applying a 3V voltage for about 30 seconds, the RPM and current consumption were measured. The photos are as follows: First photo, current value Second photo, RPM Third photo, image of the motor's end bell part Measurements are taken under the above conditions, but please understand that there may be slight variations in the numbers due to the time elapsed since listing, the impact during shipping, and the measurement environment before purchasing. ※Based on personal experience, I feel that the break-in condition of the Sprint Dash has the following tendencies. (Of course, there are individual differences, so this is just a tendency) Also, I feel that the Sprint's brushes are not very durable, so I recommend replacing them if you feel the torque is diminishing. • 37000-38500rpm (0.8-0.9A is average) Torque remains somewhat, battery consumption is moderate, alkaline batteries also run reasonably well if brakes are not applied, can be used in layouts that require sudden braking with nickel-hydrogen batteries, and in long-distance layouts. • 38500-40000rpm (0.8-1.1A is average) It feels like it's quite fast on flat surfaces, and the balance of speed, torque, and heat resistance is good in 3-lane high-speed layouts. • 40000-42000rpm (0.9-1.2A is average) While it becomes even faster on flat surfaces, heat fatigue becomes a concern during continuous running, such as from sudden braking and in races. It becomes necessary to manage batteries and, in some cases, to be mindful of cooling the motor. • 43000 or more (I think it will be 1.3A or more) It tends to lose torque, so it will be faster in layouts with shallow braking or long flat surfaces. Also, those with a no-load current consumption exceeding 1.5A may have excessive current due to initial defects or failures during use. Also, it is not recommended because there is a possibility of being suspected of doing something at race venues where experienced people gather, and it is not recommended considering the balance of heat generation and power consumption.