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This page is retained for technical reference, scooter compatibility, servicing information and historical product documentation.
Browse compatible alternativesTDR seondary gear up kit for Yamaha NMAX 125cc scooters.
When a big bore cylinder is fitted the engine is able to pull a higher gear ratio. Without adjusting the gear ratio the engine can over-rev and power is wasted, with a new gear kit a higher top speed can be maintained.
12/33t
