Do it yourself
Frequently asked questions about cars and motorcycles
Car tutorial (Do it yourself) Motorcycle tutorial (Do it yourself) Frequently Asked Questions

How to Change the Transmission Oil on the Sym Symphony 125

Model: Sym Symphony 125
Part: Transmission fluid

Video tutorial

Below are the steps to perform the service on the transmission by changing the oil on the Sym Symphony 125 scooter. First, place the scooter on the central stand and begin unscrewing the oil drain bolt found under the transmission, allowing it to drain into a container for about ten minutes; then unscrew the fill screw and top up with new transmission oil (in this case, it is inserted with a syringe).

Once topped up to the maximum level, start the engine, topping up again if necessary.


Posted on 6 June 2026 by ScegliAuto


Related tutorials

How to Replace the Drive Belt on the Sym Symphony 125?
How to Replace the Drive Belt on the Sym Symphony 125?
Symphony 125 To replace the drive belt on the Sym Symphony 125, first remove the bolts securing the cover; then you can take off the cover to access the transmiss…
How to Change the Engine Oil in the SYM Symphony 125 Scooter?
How to Change the Engine Oil in the SYM Symphony 125 Scooter?
Symphony 125 In this tutorial, you will see how to change the engine oil in the SYM Symphony 125 scooter, a very simple and quick operation. First, ensure the eng…
How do you replace the engine oil of the Sym Symphony 125?
How do you replace the engine oil of the Sym Symphony 125?
Symphony 125 To replace the engine oil of the Sym Symphony 125, you need to loosen the drain plug located in the central lower part of the motorcycle: once the pl…

How to replace the piston on a Derbi Senda 125?

To replace the piston on a Derbi Senda 125, completely remove the seat and take off all parts above the engine block. Next, disconnect the connectors and unscrew the bolts securing the cylinder to the top of the block, locating the piston inside. Remove the old piston from its connecting rod by loosening the retaining ring, and replace it with a new spare part. Finally, reassemble all the components that were removed earlier.

Watch the video!


by ScegliAuto

More videos