Restriction Notes Never discuss the technicalities of how to de-restrict with end users. But, advice given can prevent problems caused by them fiddling blindly. Piaggio have never supplied any information about how vehicles are restricted or how to make them go faster. Piaggio can not advocate de-restriction for any reason. Vehicles will only have been homologated as Mopeds so will be technically illegal if they are de-restricted. Piaggio have never offered any tuning parts. If a 50 is de-restricted the licensing requirements will be the same as a 125, so Piaggio’s official line is “Do not de-restrict, if you want to go faster get a 125” 125cc engines are not restricted, they are designed to produce no more than 11 kw. So they will be learner legal. 50cc engines are always restricted and are only sold as 50 km/h mopeds. There is no “full power” option. Most countries in Europe have the same 50 km/h category.
Restriction of 50cc 2 stroke twist and go engines. Non catalysed engines. All engines will have: A spacer between the front pulley halves. (stops it obtaining the highest top gear ratio) A branch pipe on the exhaust. (stops the engine revving beyond a certain point) In addition, water cooled engines will have: Older engines, starting with the first Runner and NRG MC2. Have a tube spot welded into the inlet end of the silencer. Newer engines. Have a tube seam welded into the out let end of the exhaust pipe. All these restrictions can be removed without the need to re-jet the carburettor. Catalysed engines. Have the spacer and the branch pipe. These engines will need a larger main jet, two sizes up on standard. Piaggio are probably unable to supply these. Do not remove the baffle plate from the carburettor bell mouth. Do not do anything to the “secondary air pipe” going to the exhaust.
Restriction of 50cc 4 stroke twist and go engines. See Chapter 3 page 11 All engines: A spacer between the front pulley halves. An electrical restriction in the CDI unit. They will need a larger main jet if de-restricted. Fowlers can supply this.
Restriction of 50cc 2 stroke geared engines. H@K & GSM. See Chapter 4 page 2
Only restriction is a restrictor in the inlet end of the exhaust pipe. A two size larger main jet will be needed. A standard DellOrto part.
If de-restriction is carried out by an authorised dealer, Piaggio are happy that the warranty will not be affected. Any tuning or fitting of after market parts by the end user or the dealer will affect the warranty.
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