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Explained simply a rather complex principle is a delicate exercise: I try to explain to you with this video a part of what happens in the transmission housing: the transmission by variation. This is the first explanatory tutorial concerning the transmission, it will follow two other tutorials to complete this first one: the operation of the clutch, and the torque corrector. ????Promotional code: thanks to your favorite channel????, you can take advantage of a 5% discount code at SCOOTFAST (that's already something!????). the code is: SIMONSF ???? Small links to essential tools for disassembling/reassembling your two-wheeler: A very good electronic caliper and always useful for this type of measurement: https://www.amazon.fr/gp/product/B082... piston block: https://www.scootfast.net/bloc-piston... The ratchet wrench set with tips TO DISASSEMBLE EVERYTHING: https://www.amazon.fr/dp/B07G2PN3CG/r... the vice you need: https://www.amazon.fr/gp/product/B01M... ⚙ Small config. : Good parts to optimize your scooter, easily: 50cc POLINI cast iron kit: https://www.scootfast.net/kit-cylindr... YASUNI z exhaust: https://www.scootfast.net/yasuni-exha... 17.5 PHBN carburetor: https://www.scootfast.net/carburateur... POLINI Hi-speed variator: https://www.scootfast.net/polini-vari... programmable rollers to adjust the variation to the hair: http://www.mir35.com/galet-programmab... With that, it will already be not bad! 00:00 Introduction 1:13 The model explained 1:45 The analogy to the bicycle 2:40 Variator and operation 4:20 Receiving pulley and operation 5:00 Summary then conclusion I am Simon and I make mechanical tutorials for all 2-wheel enthusiasts, scooter 50 or more. If you would like me to address specific topics, I will try to look into them: do not hesitate to indicate to me in the comments the subjects you are thinking of.