If a Moped is de-restricted.
All engines will have:
In addition, water cooled engines will have:
All these restrictions can be removed without the need to re jet the carburetor.Catalysed engines.
In addition, it is worth fitting lighter rollers and blanking off the secondary air system. The roller weight has no affect on top speed but initial acceleration will not be very good with the heavier rollers because it will get into high gear too quickly. Original rollers on most current 50's are 6.4 gr. CM1102025. Replace these with 5.3 gr (orange) rollers CM1102035.
The secondary air system has nothing to do with performance
but the reed valve may fail on
the higher power engine because the pulses it is subjected too are much greater, blank it off to improve long term reliability.
The restriction is the same on all 50cc four stroke models including the LX 50 4t, Fly 50 4t and Zip 50 4t (China). The main restriction on the 50 cc four stroke engine is electronic. There is no restriction in the exhaust pipe.