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What is the best way to clean you motor?

Cleaning your motor can be easy by following these few simple steps.

Step #1:

Remove the motor from you vehicle.

Step #2:

Remove the springs. Note which color of spring is located on the positive (+) side of the motor. The positive side marked with a small + sign on the top of the end bell.

Step #3:

Slide the brushes out of the brush hood. If you are going to have your armature lathed then skip to step #5

Step #4:

Insert the comm stick into the slot where a brushes go in the brush hood. Give the motor a few spins in one direction and then repeat going the opposite. You can attach a pinion gear to the end to help you.

Step #5:

Unscrew the end bell from the can. Note is this is a modified motor make sure you mark the timing and position of the end bell with the can.

Step #6:

Clean the inside of the end bell with motor. Make sure there are no motor shims inside before you clean the end bell. Note: If you are planning on using the same brushes again do not get motor spray on them. Motor spray robs brushes of there lubrication.

Step #7:

Remove the armature from the can and place it aside. Note the location of a shims and washers.

Step #8:

Clean the motor can. You can use motor spray, but it is not recommended that it be sprayed on the magnets. The motor spray can eat away at the glue that holds the magnets in the can. Use a mild soap with water to clean the inside.

Step #9:

Use a cotton swab to make sure no dirt is in the bushing or bearing especially where the arm goes through. A little motor spray applied to the tip of the swab helps get rid of any debris.

Step #10:

Have someone lathe you armature. If you don't have a lathe skip to step #11. Make sure the gaps in the comm are free of any extra copper. You can do this by running a hobby knife or razor blade through the gaps. Be careful not to scratch or touch the comm.

Step #11:

Spray the armature off with motor spray and place it back in the can and screw the end bell back in place. Remember to shim it the same as before and stock rebuildable motors have a small tab on the end bell that lines up with a notch on the motor can. Screw in the two set screws.

Step #12:

Replace the brushes if they are short, show discoloration, have chips or signs of excessive wear. If not skip to step #12B. Brushes come with two different kinds of shunts, eyelets or just straight. If is recommend that you solder you brushes to top of the end bell rather than using the eyelets for better electrical contact. If you do decide to solder the brush on, then lightly tin the end of it with solder and attach it to the end bell. If the solder doesn't stick to the end bell, then use light sandpaper to rough up the surface. Make sure that you don't get to much solder on the shunt, because this will make the brush have difficultly moving in the brush hood once the springs are reattached.

Step #12B:

To reuse an existing brush clean the brushes with the comm stick to get rid of any glaze or deposits. I recommend protecting you fingers with a rag so the small pieces of fiber glass from the comm stick don't get in your fingers. Don't ever touch the end of the comm stick. Fiberglass hurts and stays in your fingers for along time.

Step #13:

If you have comm drops put a drop on the end of each brush. This help lubricate the brushes and will help the brushes properly seat against the comm. Put the brushes back inside the brush hood.

Step #14:

Re attach the springs. Remember which one goes on the positive (+) side of the end bell.

Step #15:

Apply a few drop of oil to the bushing or bearings.

You are now ready to break in your clean motor!

How do I break in a rebuilt motor?

You will need a 4 cell battery pack and a way to attach it to your motor. Attach the 4 cell pack to you motor. Make sure you note the polarity (+) and (-) on the motor is the same as the battery. The top part of the battery with the nipple is positive (+). Let the motor run for almost a minute or so. I don't recommend spraying motor spray on the comm while it is running, because motor spray is flammable and duh there are sparks being made between the brushes and the comm. Oh and make sure you lubed your bushing or bearing with oil. This will help the arm spin freer in the can.

What are capacitors?

Capacitors? help stop radio noise caused by electric motors that may interfere with your receiver and cause radio glitches. For more information on soldering capacitors see my soldering tips page.

How should I gear my motor?

This depends largely on the type of motor, track layout, track conditions, and the type of driver you are. First need to understand what a gear ratio is. Check out my RC TUNING page for a gear ratio explanation and starting point gearing chart. Before you put down your car on the track. Study the design of the track. To often people gear their cars to the straightway and not the whole track. If the track is full of turns, use a small pinion gear that will give you more acceleration or bottom end speed. The reason behind this is because before your car reached top speed, the next turn would come up and your car would have to slow down again. If the track has many straight and long paths use a larger pinion gear that will give you more top speed acceleration. The reason behind this is because a straight track will give you a longer period for your car to travel at top speed. Just remember the larger the pinion the less bottom end / take off speed you have. Always make sure you are checking to see if the motor is running hot when you take it off the track after three or four minutes. If the motor is hot go to a smaller size pinion. Every motor is different so experiment.
What do the numbers mean on a stock pro motor.

How do I know which motor is the best?

The labels on many stock pro or dyno'ed motors have the following abbreviations: RPM or revolutions per minute, Power or Wattage, Eff or Efficiency and Torq or Torque. The main number to look at would be the Power or Wattage of the motor. This represents the overall power of the motor. A motor that has a better power rating than other motors is most likely to produce faster top speeds and better acceleration. For a Trinity motor a power rating of 130.0W is really good. The Efi on the label is the motors overall efficiency. The higher this number is will result in better run times and cooler, more consistent performance. Torq and RPM are interrelated because usually the lower the RPM the more Torque a motor will have. Even if you have two of the same kind of motor you may have to gear them different depending on there Torq and RPM. For the most part picking a motor with the best power rating and then looking at the other numbers is your best bet.

How do you care for the magnets in the motor can?

The best way to care for you magnets is to avoid overheating your motor. A magnets loose magnetism, but you can slow this process down by finding a gear ratio that doesn't overheat them. Using a small pinion and a larger spur gear will help in keeping your motor cool. So let the motor cool off before you go run the next pack. Avoid trying to cool a motor down to rapidly because there is a possibility of cracking the magnets. Be especially careful when using compressed air cans, because when turned upside down they can actually freeze objects. Also avoid putting to many harsh chemicals on them while cleaning. Many chemicals can eat the glue that adheres the magnets to the can. If you have lots of money to blow then you could also get a magnetizer which gives magnets their life back.