Attention, part not approved on the road, reserved exclusively for circuits, runs ...
Here is a totally exceptional kit, although it has already existed for a good number of years, this kit has never been copied or equaled in terms of engine displacement ... Indeed, with its diameter of 55mm and its crankshaft stroke of 46mm, this kit offers no less than 109.28cc real! This model is created for 90mm connecting rod.
Thanks to the 90mm rod it will release more high speed (less forcing rod) and it also allows to reduce the acceleration speed of the piston (modification of the engine movement). The assembly is totally possible on DERBI euro 1 and 2 but be careful, you will still need tools and a good base of mechanical knowledge! The machining to pass the cylinder base is mandatory, to pass the crankshaft too, engine preparation is mandatory in order to align the transfers ... The assembly will not be a simple assembly of parts but really a complex job that must be carried out properly PARMAKIT studied the part for a long time before taking it out, they certainly put a Ø55mm bore in this cylinder but the skirt thickness is still very correct from a solidity point of view. This large bore obviously requires a long stroke to speak ...
The cylinder has been very worked, 6 intake transfers are present, two transfers for the rear (we all know that the rear transfer is almost only used for activating the valves and for scanning ...), the sides are therefore at the number of 4 and they are very bulky, increased on the low front like most major brand hyper racing cylinders. Exhaust level, PARMAKIT has opted for the booster exhaust, it is the most suitable for the torque of the beast, a large exhaust booster very well designed is therefore on this cylinder. The piston is a true vertex in single thin segment (1mm) in order to release the high speed well and it is in addition a forged model! A real one, which is very resistant and efficient! It is a piston with a low domed cap.For the cylinder head, the heat must be extracted from this thermal unit (especially given the 46mm stroke which further increases the heating) PARMAKIT therefore opted for a stud cylinder head.
The cylinder head stud machined in the mass of aluminum is top of the range, the chamber is a model very well suited to the piston / cylinder, its shape is hemispherical with a polished finish, the stud is entering in order to be sure that the alignment is always good The incoming stud also prevents breakage of the cylinder head gaskets! The cylinder head cover is also very well designed and has excellent support! Anyway… We could spend hours talking to you about this pretty monster that the great PARMAKIT brought to us. The whole is really a quality set, neat, with great study. We also strongly appreciated the well-defined diagrams in relation to the whole.
We recommend this kit with: PARMAKIT crankshaft 46mm stroke 12mm axis 90mm rod , 28mm minimum and quality carburetion with valves / pipe… Reinforced bearings, good cooling, complete preparation, efficient ignition, well reinforced clutch, cold spark plug, exhaust to be defined…
The pack contains :
X1 cylinder head stud
X1 pack attached with 4 base gaskets for squish
X1 cylinder head cover
X4 engine studs
X1 cylinder 6 aluminum transfer nykasil d.55mm for 90mm rod 46mm stroke
X1 vertex piston d.55mm mono segment forged
X1 cylinder base shim
X1 segment d.55mm X 1mm hard chrome domed
X1 piston pin 12mm
X2 crab type piston clips
X1 notice
X1 sticker
...
As an option we offer a stage 1 preparation, this preparation is a modification of the exhaust port by increasing the diagrams and improving the duct, it increases the performance of the cylinder. An improvement to the bottom of the skirt is also included in this modification. Allow a little extra time for this preparation!
This high engine is mounted on 50cc motorcycles with gearboxes equipped with the DERBI Euro1 and Euro2 engine:
BULTACO Astro enduro 50cc
BULTACO Lobito supermotard 50cc
DERBI GPR 50 Nude before 2004 (EBS050)
DERBI GPR 50 Racing before 2004 (EBS050)
DERBI GPR 50R Replica year 2001 to 2004
DERBI GPR 50cc year 1998 to 2001
DERBI Senda 50cc before 2000 (tubular frame)
DERBI Senda 2000 50cc before 2004 (perimeter frame) Euro2
DERBI Senda DRD supermotard before 2000 (tubular frame)
DERBI Senda DRD supermotard before 2004 (perimeter frame) Euro 2
DERBI Senda Enduro before 2000 (tubular frame) DERBI Senda R DRD Enduro before 2000 (tubular frame)
DERBI Senda R DRD Enduro before 2004 (perimeter frame) Euro2DERBI Senda SM before 2000 (tubular frame)
DERBI Senda SM before 2004 (perimeter frame) Euro 2DERBI Senda X-Race 2000 before 2004 (perimeter frame) Euro 2
DERBI Senda X-Race Trail before 2000 (tubular frame) DERBI Senda X-Trem Enduro before 2000 (tubular frame)
DERBI Senda X-Trem Enduro before 2004 (perimeter frame) Euro 2
DERBI Senda X-Trem SM before 2000 (tubular frame)
DERBI Senda X-Trem SM before 2004 (perimeter frame) Euro 2
GILERA GP Replica 50cc
GILERA GSM 50cc
GILERA HAK Euduro 50cc
GILERA RCR Euduro 50cc (tubular frame)
GILERA SMT SM 50cc (tubular frame)
GILERA Sioux Enduro 50cc
GILERA Zulu Enduro 50cc
And many other models ...
