Not approved on public roads, reserved for competition only, does not respect the highway code in any way!
Here is the 80cc mono segment cast iron kit from TOP PERFORMANCES for mécaboite 50cc derbi euro 3 and euro 4 engine, it is certainly in cast iron but MINACROM treated with also a chrome exterior treatment, diameter 50 millimeters, diagrams revised downwards for the torque , this one has 5 transfers, oval exhaust, it is clean and finished.
This one is accompanied by a TOP PERFORMANCES piston reinforced single segment, end chrome bomé 1.5mm thick with piston pin Ø12 X 40mm, as well as its clips in C.
It also has an aluminum stud cylinder head with a high compression chamber, hemispherical and polished finish which offers a compression ratio of 14: 1, this one has a water pipe connection at the top fixed by 3 screws M5 X 14mm.
Clearly, you will understand that this kit offers acceleration and recovery, ideal for lovers of engine torque.
We recommend it to those who want something between big power (especially torque) and solidity, delivered as presented.
We recommend accompanying this kit with at least : 21mm carburetion, reinforced crankshaft and bearings, racing clutch, racing exhaust, racing cold spark plug, racing engine oil, etc.
As an option we offer a stage 1 preparation, this preparation is a modification of the channels and the exhaust port by increasing the diagrams and improving the duct, it increases the performance of the cylinder. An improvement to the piston and the bottom of the skirt is also included in this modification. Allow a little extra time for this preparation!
Here are some pictures of the prep option:
