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how DO you tell a chink bike from a jap? I just bought a 2009 Super 8 (4 stroke version) and I have removed the shoulder on the variator boss and I have also removed one of the purpole wires going into the CDI. If it revs higher than 8000rpm you're don't have a restricted CDI in place. Get an unrestricted CDI if the scooter wont go faster, even downhill. Enter your email address to subscribe and receive notifications of new posts by email. Over the next days/weeks I will explain the basics of scooter tuning, starting with simple improvements like derestrict a 50cc scooter and later going deeper into engine tuning concepts like flowing or changing the engine timings. - Monimoto US, How To Quickly Determine The (DellOrto) Carburetor Main Jet Size, How To Check Your Spark Plug for the Correct Carburetor Setting, How to check if your Scooter CDI is restricted, The Ultimate Scooter Tuning Exhaust Test (70cc Sport), To allow for use with a certain drivers license class, To comply with speed limits and legal requirements, Check the vario rollers for wear and replace them with new ones, Ensure that the belt is still within specification or just get a new one, Remove the vario restriction as described in the article. I dont understand how a carburetor can get to much air. Larger Air Fuel Mixture + Hotter Spark = Increase Horsepower and Speed Best Gas Scooters For Adults (Review & Buying Guide) in 2023 - The Drive thanks shaun. We're always willing to return your call if you have questions. What other ways do Chinese manufactures do to restrict RPM and performace. they all look the same! Abbigliamento, Caschi e Accessori Moto. The rear pulley acts weirdly and doesnt fully close, hence does not allow the belt to travel all the way up. Easiest is to swap the cylinder with a racing kit, like the Stage6 Sport Pro! There are different reasons why scooters are having restrictions applied. This is probably somewhere around 7-800rpm. But there are a lot of variables here that affect belt life. Hi, I live in Spain and my 50cc scooter has just failed its test because it goes too fast :)) There doesnt seem to be a single article to tell me how to restrict it. So you took the clutch a part and now it only goes half speed? Your manual will indicate the engine size, and the mechanic or salesperson will show you the range of muffler options. Hi I have a 50cc derbi pro 2011, i have taken off the restrictor plate, do you know if you are supposed to raise the jet or lower the jet? You should be happy that it goes 35. You will need to buy a new one here. There are some tuners in Japan that make products for Honda engines but rather for the newer models (Dio, Zoomer, etc). Thanks Shaun. I bet most bikes use AC CDIs for example. Hope these 50cc scooter upgrades help you make your scooter faster. The other things to do are described in the article. Unlike with the stock restrictions, these custom restrictions are explained in detail in your operating license. Weve derestricted by buying the modded cdi,when opening up to full throttle it only revs up to 9000 rpm then backs down to 8000 and keeps alternating between the two,you can get past it by adjusting how much throttle you give it but if you give it too much it bogs. If you aren't, sell it and buy a reputable brand's 2 stroke, it'll automatically be peppier and easy to hop up. 4. Unfortunately high temperatures should try to be avoided when increasing performance (increasing temperatures equal a loss of energy into heat). This means that the manifold at its smallest point needs to have a diameter of at least 12mm as well. Do you have any tips for me on how to derestrict it and/or improve performance. at 12mm the mainjet should be 55 or 60! Hey Shaun, Yes, this sounds like the gears are too short!