Not approved on open road, only reserved for competition on circuit, runs, closed road.
The color is announced: very high-end Mazzuchelli crankshaft (like the MHR BIG Bore) with forged 90mm connecting rod and Ø20mm bearings, 14x17x15 mm cage, very high quality steels, dynamic top balancing designed to be assembled with a balancer, diagrams excellent, high compression stud cylinder head, excellent compression ratio, cooling studied with a semi-closed type cylinder, large diameter exhaust with boosters, 6 intake transfers with studied shapes, 44.90 stroke with Ø50mm piston diameter, ITALKIT graphite piston, ....
The competition has better behave and is far behind on most of the maxi-kits. Only negative point of this pack, the absence of a set of clutch springs, celeron bearings and several base gaskets like the pack for AM6! A novelty from the great Spanish brand ITALKIT and finally available from us, this ultra complete 90cc engine pack is mounted on mécaboite driving DERBI Euro 3 and Euro 4. This set will offer you all the power you are looking for to distinguish you during competition and win the first place.
As usual, the ITALKIT brand is no exception to the rule by composing this pack of the best current parts on the market. The aluminum alloy cylinder has a specific heat treatment and an internal coating in niquel / silica and external in chrome, giving it all its solidity and reliability, foolproof! Equipped with no less than 9 lights including 6 intake transfers, 2 shaped boosters and finally the impressive exhaust outlet by its shape and size to such an extent that the outlet diameter has been revised upwards and measures no less than Ø30mm, between axis of fixing for the exhaust 46 mm. A work of the crankcases is recommended in order to align the cylinder / crankcase perfectly.
That's not all, the cooling has also been completely revised and corrected in order to offer the best possible heat exchange and at the same time to obtain a significant performance gain, indeed less an engine runs out of steam and overheats. and the more the performances remain present.To accompany this cylinder, a cylinder head with competition stud! Top-of-the-range model, specially designed to offer maximum compression. The cylinder head stud is unfortunately not entering and mounted on an O-ring, the combustion chamber is hemispherical in shape and has a very successful polished finish, smooth and clean.
The Ø50mm piston is not chosen at random, it is a single segment model from ITALKIT with graphite treatment. In other words, very high quality material whose reputation / quality is well established. This piston is therefore equipped with a fine chrome segment 0.80 mm thick thus promoting the increase in speed. Thanks to the graphite treatment, its shapes and its composition, this piston has been very well designed and studied in order to offer better thermal expansion, at the same time fitting perfectly with this cylinder to withstand frank revisions, sudden changes of regimes and prolonged endurance on the track.
Finally, the special crankshaft 44.90mm stroke and 90mm connecting rod. This model is unique and once again very successful. It is perfectly well balanced and cut from the best steels on the market. Its dynamic balancing results from the inorganic tungsten carbide compound. This material in summary is a combination of carbon and tungsten. It is a material reputed to be very dense, very resistant and very hard.A new connecting rod is also installed on this linkage, an ultra-reinforced model machined in the mass. Ultra light, it is really reserved for competition!
It is this type of connecting rod that equips real competition crankshafts BIDALOT or MALOSSI MHR BIG BORE and other extremely rare vilo! Featherweight and maximum rigidity are there. Its lubrication is improved, the small end cage is increased for better holding, treated with silver and mounted on anti-friction wedges. A crankshaft as you will have understood, perfectly designed and adapted to accompany this high engine, which can support without no problem with the craziest engine speeds up to 16,000 revolutions / minute and in combination with this cylinder and the 44.90 mm stroke the actual displacement is 84cc with no less than 28cv announced by the brand on condition of a perfect assembly and adjustments in the rules of the art!
In summary, this 90cc Ø50mm racing pack / kit for your DERBI euro 3 and 4 engine will be a real asset to offer you assured victories in competition, runs ... and guaranteed sensations at the same time! Delivered complete as presented, you can trust the photographs, they are contractual as usual.
We recommend that you accompany this pack with at least : a carburation of 26 to 28 mm for the best, an intake kit in flexible assembly, Selettra ignition from ITALKIT with variable advance, cold spark plug NGK B105EGV, racing engine oil mandatory , large-volume racing trigger exhaust essential ... followed by assembly with ITALKIT instructions provided.
This pack contains :
-Cylinder Ø50mm aluminum 6 transfers with large exhaust booster
-Piston ITALKIT graphite mono segment Ø50mm
-Aluminum cylinder head cover
-High compression hemispherical cylinder head stud, polished finish
-Segment Ø50 end chrome thickness 0.80mm
-Reinforced piston axis Ø14 X 38mm
-Crab type piston clips
-Ultra reinforced crankshaft long stroke 44.90mm ultra reinforced 90mm connecting rod with balancer
-Silver needle cage Ø14X17X15mm
-Pack of engine seal
-X4 Reinforced studs M7X120mm
-Installation instructions
-Sticker
Technical recaps :
- Work of the original housings necessary for transfers revised upwards
- Cooling: semi-closed liquid
- Compression ratio: 13.91: 1
- Announced displacement: 90cc
- Actual displacement: 88cc
- Advertised power: 28CV
- Base gasket provides thickness 0.30 mm
- Recommended squish value 0.85 mm
- Volume of the chamber (cylinder head) 6.20cc
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!
