Slow mod blues

Radio Control Car Action, Sep 2003 by Howell, John, Taulmann, Todd

I run a mod motor in my Associated 63, and lately it's been getting really slow. It used to run fine. I just can't tell whether it's my batteries, my ESC or the motor itself. Help! Todd Taulmann

Three things to check here, Todd.

1. Is your ESC up to the task? Certain ESCs have limits on which motor winds they can handle. If your ESC can't handle the motor in your 63, you could have fried it!

2. Batteries-old or new? Ni-Cds or NiMH? Old-school 2000 cells or fresh 33005? Older batteries may need to be reconditioned, or they could be totally worn out. Check for vented cells in your pack, monitor their voltage, check them on a battery discharger, etc.

3. Take apart your modified motor and clean it (note the proper order of how it came apart; keep the motor shims in the right order). After you've cleaned it thoroughly, inspect the brushes and make sure they're still in good shape. Next, clean the comm. If it shows visible signs of pitting, or scatches, have someone cut the comm for you and install new brushes (don't even think about running your old ones). Also, visually inspect the winding on the armature. Look for broken or damaged wires. If you see obvious signs of a comm problem, then you'll need a new armature.