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The original ENGINE has been revised on ALL sides for 7 weeks! We have optimized this together, week after week: now, the cherry on the cake: we add the expansion MUFFLER which will FREE this engine for us: AND IT WORKS STRONG! But to respect the imposed budget and stay within 28€: NOT SIMPLE, we have to play a little... shall we see that together? ... 🥳🥳 RETURN OF THE SCOOTFAST PROMO CODE: SIMON03 ☕To follow me on INSTAGRAM, and ask me questions: https://www.instagram.com/p/CD1_0Aini... 👍To support him: the tipeee link: THANK YOU!! https://fr.tipeee.com/le-chant-du-cli... 🔧 Small links to essential tools for disassembling/reassembling your two-wheeler: the essential 1/4' torque wrench: https://www.amazon.fr/gp/product/B08Z... and an even cheaper one on aliexpress: https://s.click.aliexpress.com/e/_AFBbHa the 1/2' torque wrench: bigger but also useful: https://www.amazon.fr/gp/product/B01N... A very good electronic caliper and always useful for this type of measurement: https://www.amazon.fr/gp/product/B082... and even cheaper on ALIEXPRESS: https://s.click.aliexpress.com/e/_A6iEEi Booster variator block: https://www.amazon.fr/gp/product/B07J... Clutch disassembly key: https://www.amazon.fr/gp/product/B071... Ignition lock key: https://www.amazon.fr/gp/product/B07N... The ratchet wrench set with bits TO DISASSEMBLE EVERYTHING: https://www.amazon.fr/gp/product/B07B... the vice you need (I've lost count of how many times I use it: essential!): https://www.amazon.fr/gp/product/B01M... and to adjust its variation to perfection, a box of DOPPLER rollers: https://www.amazon.fr/gp/product/B07G... ⚙ Small config. 50CC that works WELL: Good parts to optimize your scooter, easily: 50cc POLINI cast iron kit: https://www.scootfast.net/kit-cylindr... YASUNI R 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... DOPPLER air box (no more noise, performance gain ;!): https://www.scootfast.net/boite-a-air... With that, it will already be not bad! Config' in KIT 70: MOST 70CC Kit: https://www.scootfast.net/kit-cylindr... Carburateur dellorto 19mm: https://www.scootfast.net/carburateur... 00:00 Introduction and video plan 02:07 1 - Reconditioning of the second-hand exhaust 04:12 2 - TEST of the expansion exhaust: NICE SURPRISE! 07:50 3 - Analysis of the results: WHAT IT CHANGES! with CURVES! 11:47 The secret of an AMAZING exhaust RENOVATION! 14:35 Conclusion of the video and SCOOTFAST PROMO code