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How to Change the Transmission Oil on a Sym Symphony 151 Scooter

Model: Sym Symphony 151
Part: Drivetrain

Video tutorial

How to change the transmission oil on a Sym Symphony 151 scooter? Follow this guide to proceed with the replacement. Position the scooter on the original stand, and using a socket wrench, unscrew the drain bolt located under the casing (drain the fluid into a container).

Refit the drain bolt to the casing. Unscrew the special bolt just above the drain bolt (as shown in the video).

Refill the new transmission fluid using a plastic syringe (fill with the correct amount of oil); close the casing with the locking bolt. Test the scooter's operation.


Updated on 8 March 2026 by ScegliAuto


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Watch the video!


by ScegliAuto

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