CDI unit, DC powered, No Rev Limit
This DC-powered CDI is a bit uncommon, used on only a hand full of models. Most 150cc vehicles use an AC powered CDI.
NO REV LIMIT
GY6 rev limits are a myth. We've tested this CDI to 30,000RPM (Thirty thousand) using an oscilloscope and trigger simulator. That's THREE times faster than your engine can possibly run!