![]() ![]() This is an especially high risk with tuned engines that run lean. the piston can subsequently over-expand and can seize inside the cylinder in which it is suddenly too big to move up and down within. This comes at a cost though, a lean mixture can cause the piston to run hot. From an emissions perspective the introduction of fresh air into the flow can certainly make the exhaust gases appear more dilute when measured. The air flow of this pipe is controlled by a solenoid which in turn is controlled by the bikes ECU/ CDI.Ī 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. 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. 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'. How are Euro4 Piaggio 2-stroke 50cc scooters different from previous versions? 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. 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. 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. 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 to their 4-stroke counterparts, 2-stroke scooter engines can be easily and cheaply tuned to see a very significant increase in power. 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. This blog details how to derestrict the newer Euro4 versions of the Piaggio 50cc 2-stroke scooters, additionally allowing further tuning possibilities. Derestricting a Euro4 Piaggio 50cc 2-Stroke Scooter ![]()
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