First are you sure you can adjust your timing? most 19t are fixed timing endbells, although there are some that you can adjust. Changing timing is not going to help a contact problem, an electric motor is a simple device. If it's not moving there isn't enough current to overcome the magnetic field of the can, so even if it's making contact it's not making enough, or something is preventing the power from getting from the lead to the comm. Try using a section of a dead brush (with the shunt removed) and put it behind your brush and the spring, this will give more tension to the brush and allow you to run it smaller. Some brush hoods also are not slotted enough on the spring side to allow the spring to push on the brush past a certain point.
Mike L. Awesomatixusa.com | TQWire.com | Islandraceway.com |JacksonRCracing.com | Horsham RC | Sweepracingusa.com