Derestricting a Euro4 Piaggio 50cc 2-Stroke ScooterThis blog details how to derestrict the newer Euro4 versions of the Piaggio 50cc 2-stroke scooters, additionally allowing further tuning possibilities.We have used a Piaggio Typhoon 50cc 2-stroke scooter for this blog, but the principle can be equally applied to other Euro 4 Piaggio engineed scooters such as Piaggio NRG Power, Aprilia SR50R and SR Motard, which are restricted in a similar fashion.
In contrast to their 4-stroke counterparts, 2-stroke scooter engines can be easily and cheaply tuned to see a very significant increase in power. Simply fitting a sports pipe and performing basic de-restrictions can double the power of a standard 50cc Piaggio moped and unleash its top speed from a learner legal 30mph to a far more exhilarating 55mph all for less than 100.In contrast you would struggle to get a 10% power increase from an already much less powerful 4-stroke moped for the same investment , nor will the 4-stroke lend the experience, noise and vitality of the tuned 2-stroke as it hits its high revving powerband invoking envy from it's 4-stroke peers (who realise now they bought the wrong bike) and hate from the neighbours mourning the loss of their silence.The 2-stroke days are numbered though, on the date of writing the only 2-stroke mopeds still in production in the UK are Aprilia SR50R, SR Motard, Piaggio NRG Power and Typhoon. This is of course because 2 strokes are noisy, smelly and much less efficient than the 4-strokes and manufacturers have found it increasingly impossible to make them comply with ever more stringent European emissions regulations.
how to derestrict a piaggio zip 50cc 2 stroke
In order to comply with strict Euro 4 emission regulations the last version of the Piaggio 50cc 2-stroke engine features a new 'electronic carb'. This incorporates an electronic air addition system: A pipe going into the carburettor allows air to be drawn into the carb, the extra air leans the fuel mixture at certain times subsequently reducing emissions and increasing fuel economy. The air flow of this pipe is controlled by a solenoid which in turn is controlled by the bikes ECU/ CDI.A bike with a leaner fuel mixture of course uses less fuel in proportion to oxygen and in theory the additional oxygen content is said also to help burn off any unburnt fuel in the exhaust. From an emissions perspective the introduction of fresh air into the flow can certainly make the exhaust gases appear more dilute when measured.
Step 3: Fitting a power pipe.Now we have derestricted the Typhoon we are able to exploit power pipes (sports exhausts) and other tuning options. To complete our Typhoon we fitted a Leo Vince TT . A Leo Vince TT is a basic budget sports pipe which will almost double the hp compared to the standard Piaggio exhaust. When fitting a powerpipe it is necessary to rejet (increase the size of the main jet in the carb) and also to fit lighter rollers to enable the variator to operate at slightly higher rpm than standard. The Leo Vince TT exhaust typically requires rollers approx 1.5 grams lighter than the standard ones, our Typhoon showed the best results on the dyno with 4.8 gram rollers fitted which is typical for Piaggio 50cc with a sports pipe and standard cylinder kit .Historically a Piaggio 50cc engine previous to these Euro 4 ones with a sports pipe fitted when run on our dyno will nearly always jet perfectly with a 68 jet fitted. Out of 100 dyno runs, 98 of them will end up with a size 68 jet.
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. Along with that I will also explain which parts should be installed first when starting tuning a scooter and which ones need to be replaced when getting more serious. Welcome to Part 1: How to derestrict a 50cc scooter.
Hi i want to derestrict my 2 stroke 50cc scooter it is a Honda Hero Winner. I cant find much on this scooter so i know nothing about it. The fastest it will go is about 58km/h and if im lucky 60km/h. i dont have any money to use to upgrade it or buy parts otherwise i would buy a new one that goes faster. Can you please help me with tips on making it go faster? I just cause traffic everywhere i go and in South Africa that is not a good thing. Thanks
Hey i have a Dongfang 50cc SST (DF50SST), Its restricted and only goes a max of 31 mph after 15sec of full throttle. And after some research i thought a derestricted cdi would help so i bought one, installed, and no change. What other ways do Chinese manufactures do to restrict RPM and performace. Thanks in advance. 2ff7e9595c
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