In theory, it works. Treating the symptom doesn't fix the problem. The root cause of the problem is poor, corroded connections. If this was a real problem, it should have manifested itself when the machine was new. These machines don't ride in the best of conditions - deep water and mud followed by dusty trails, etc. They take more maintenance that the family car. It doesn't take much resistance due to corrosion to lose 2-3 volts at the starter.