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In this video I build a Simson M500 tuning engine with a JW Sport 85RM cylinder with diaphragm inlet, an RZT tuning crankshaft and Ronge Motorsport primary drive were also installed. I show you how I personally build such an engine and give you a few tips on what can be improved or what you need to pay attention to. Description JW Sport Cylinder Kit 85RM stands for 85ccm racing cylinder, reed inlet controlled Technical details: Italkit piston hard anodized with piston window, very durable Malossi VL 17 reed with rubberized aluminum carrier VL17 reed box 360° intake manifold rotatable for carburettor with 35mm connection diameter (PWK 24-30mm) 5-channel flushing with secondary outlets Sensibly maximized channel areas without weakening durability Italkit piston hard anodized with piston window, very durable After channel machining, the cylinder is angled, drilled, honed, flushed and deburred Bore size between 49.25 and 49.75mm so that at least 5 grinding dimensions are still available The channel and timing design is designed for high utility value and a wide range with a minimal reso hole From street use to racing victory, everything is possible thanks to the good driveability Good exhaust compatibility. Can be used with many common resonance exhausts, including those from other manufacturers. Performance depending on attachments and tuning 16-19 hp wheel power with a wide usable range. Enjoy the video. Crankshaft bearing puller: Please note, unfortunately not available at the moment, I couldn't find it anywhere ????✌️ NF-PERFORMANCE online shop: https://www.nf-performance.shop/ Subscribe to our channel and activate the bell, then you will automatically receive a notification as soon as a new video is available. You can also leave comments and help us expand the content according to your wishes. If you have any questions: [email protected] My video only shows my personal experiences. I accept no liability for property damage or personal injury when copying. My channel NF-Performance is mainly concerned with the topic of Simson and the 2-stroke engine. In my videos I show you everything about tuning, engines, etc., give you tips, report on meetings and road trips, motovlogg. Thank you for watching my videos. You can also write to me with personal questions via @ [email protected] I am happy about every donation, no matter how small. If you want to support me and my channel, I would be very happy about it. :-) https://www.paypal.me/NFPerformance Greetings Niko #Simson #Racing#Tuning