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This Performance CDI for the Yamaha Grizzly 660 (02-08) increases rev limit 1,000 RPM over the stock (from stock CDI 7,600RPM to 8,600RPM). In addition, this unit offers a re-mapped timing curve which yields a noticeable increase to horsepower and torque over the stock CDI.
This CDI box is a direct plug in replacement CDI. Simply locate and remove the stock CDI, and plug the unit directly into the wiring harness, no modification needed. Suitable for stock and modified machines.