Not approved on the road! Reserved for competition.
Here is an excellent kit, very precise, sharp and powerful, of high fashion and top of the range although we would have preferred it delivered with a cylinder head cover considering the price… This cylinder head cover is not so important since it covers it - original DERBI cylinder head mounts without under top. We recommend it to those who really want the power and the fat preparation. It has a diameter of 50 millimeters, a very fine hard and domed chrome dual segment piston, this allows very high speeds while keeping an enormous torque, the piston also reinforced but cast not forged.
The cylinder head stud is really very worked, high compression frustoconical chamber, polished and very efficient. This kit unfortunately comes with only one base gasket, so you will not be able to polish your squish, so we advise you to buy several base gasket of different thickness. The cylinder is cleanly bored aluminum in d.50mm treated nikasyl, has a large exhaust with boosters, 5 transfers of special size for the sides therefore provide an alignment, the skirt is cut gradually towards the rear in order to obtain optimal filling (profiled skirt system).
It is quite discreet by its shape taken from the original DERBI EURO3 and 4 cylinder and its brilliant gray color. It is also delivered with 4 cylinder studs, enough to start on a very good high engine base.
The pack consists of:
-1 polished truncated high compression chamber cylinder head stud d.50mm aluminum
-1 cylinder d.50mm aluminum / nikasyl 5 transfers exhaust with boosters
-1 piston bi segment with reinforcement bar
-1 axis original diameter reinforced anti-wear treatment
-2 reinforced axle rings (piston clips)
-1 complete seal pocket
-2 reinforced hard chrome domed segments
-4 cylinder studs
-guaranteed Polini
-Notice Polini in French / English / Italian
- polini stickers
We recommend it with at least: 21mm minimum carburetion kit and 24 for good use / racing exhaust / reinforced crankshaft / reinforced bearings / cold competition spark plug / 100% quality synthetic oil
