Kit 80cc high engine Ø50mm MALOSSI MHR Team aluminum DERBI euro 1 & 2

Not approved on road, only reserved for the competition, private circuits as the MALOSSI GP 80cc cup, the trophy MALOSSI supermoto ...

The famous kit MALOSSI MHR TEAM used for various cup MALOSSI GP 80 trophies and super bike MHR, one of the best kit for 50cc box ... For fadas of high speeds, torque and quality! With its aluminum cylinder high-end 50mm diameter you will get real 78,53cc torque and high speed.

You will certainly appreciate the high quality of treatment and quality nykasil boring. It is intended for race crankshaft 40mm rod 90mm (origin Derbi), a good crankshaft ultra reinforced normal race will be impeccable. You can also ask in the long race 42mm) without exceeding the 195 ° of exhaust diagrams, so this kit goes great with long strokes.

Level diagrams, MHR typed high, 189 ° to the exhaust and no less than 129 ° for admission accompanied by a compression ratio of 1: 15.4! MALOSSI MHR announcement 22cv 12 000 rev / min and torque 13kgm 11 750 revolutions / minute! The architecture is perfect ducts, the exhaust is a wide template boosters to maintain good strength while providing good performance. The piston is in mono chrome domed end segment hard and prepared kit to best improve scanning, it is also very short for less friction, the cylinder head is a model bi-conical portion for extreme cooling. It is a very powerful certe but really strong package. We have also enjoyed the clamping cylinder / cylinder head which is carried out directly on the valve cover stud! This kit is obviously delivered with seals of different thicknesses to make your squish, studs and tightening nuts ....

We advise to accompany this kit with at least: cold spark plug competition, crankshaft and reinforced bearings, big carburetor (24mm minimum required), racing exhaust suitable, oil pump removal, reinforced clutch, cold candle racing ignition.

Technical Summary:

Displacement 78,6cc real race origin 40mm (90mm rod on the origin)
Recommended compression ratio 1: 15.4
Recommended spacing segment ends: 0.15mm
Game piston / cylinder minimum: 0.051 a 0,059mm
Volume advised room: 5,4cm3
Squish advised: 0.55mm
Advertised power MALOSSI MHR: 22cv 12000 revolutions / minute
Couple announced MALOSSI MHR: 13kgm at 11750 revolutions / minute
Diagrams 189 ° to 129 ° exhaust for admission
MSRP MALOSSI MHR: 424.98 euros

Info MALOSSI MHR here: https://www.malossistore.be/Archivio/MONTAGGIO/73%209128_002.pdf

Specifications by malossi:

THERMAL GROUPS MHR decomposable cylinder head

The new MHR MODULAR HEAD decomposable are the natural evolution of the MHR MALOSSI line. Research results of its technicians, they are behind the victories of official national and European teams in the cross and speed trophies. Malossi is happy to guarantee all pilots who want to participate in the National and European Trophies, product quality and worthy of a very high level of performance.

CYLINDER

- Material: special aluminum alloy with high percentage of silicon and titanium, guaranteeing an exceptional tensile strength even at high temperatures.
- Heat treatment: special hardening heat treatment and stabilization, which on one hand gives the material increased toughness and excellent rigidity, and another gives mechanical and dimensional characteristics consistency up to a temperature of 250 ° C.
- Machining on the Elimination of clippings: realized on machining centers with CNC dimensions and shape tolerance (roundness, perpendicularity).
- Report on the inner surface: effected using silicon carbide on a nickel matrix with heat treatment that guarantees extreme hardness (around 600 HVD, 1/5) with a very high wear resistance.
- Internal machining of cylinder: using special machines that achieve a level of finish on the roughness of the junction with sliding walls according to the angles set at the design stage (grinding).
- Diagrams and exhaust openings: designed and manufactured especially for the competition. The definition of exhaust diagrams has requested considerable effort on the part of our technicians on test benches static engines and the competition tracks on which the trophy is held.

PISTONS

- Material: special alloy with high percentage of silicon, to ensure excellent heat resistance and dimensional stability to temperature changes.
- External coating: graphite coating that guarantees a very low friction coefficient.
- Structure: reinforced to withstand the stress suffered by cylinder units used to compete at the highest levels, but at the same time light enough to reduce inertial forces.

SEGMENT

Segment spheroidal cast iron with high mechanical strength on the contact surface, wear-resistant hard chrome ground and lapped.

CYLINDER HEAD

The new Malossi modular head has been specially designed to ensure the evacuation of the immense amount of heat that develops in an engine with high specific power, for the competition.
It is composed of a cylinder head alloy hardened special aluminum and income high silicon content, attached directly to the cylinder liner which is covered over its entire outer surface by coolant, which ensures a large surface area exchange. In addition, since it is free relative to the outer wall, it can follow the expansion of the cylinder.
The combustion chamber is made ​​entirely with digital controlled machines to ensure tolerances of dimension and shape of the millimeter hundredth.
A full cover system with decomposable cylinder head, which closes the top of the cylinder, for better holding of the coolant.
The combustion chamber of this thermal group was specifically studied both from the standpoint of the geometry of the squish to use the occasion of the Trophy Scooter Speed ​​Trophy and Scooter Cross.

The pack contains:

Cylinder head stud

cylinder head cover

Pack complete joint

X4 studs

X4 clamping nuts

Cylinder exhaust has boosters aluminum

D.50mm piston mono segment

Segment

Clips C

Ø12mm piston pin

Cage needle Ø12X15X15mm

screws

full entry

Spare parts:

Piston Clips

Cylinder / piston without cylinder head

Piston

Segment

Piston Pin

pocket attached

Kit bolts + nuts

Cylinder head stud

Needle cage

head cover "valve cover"

Optional we offer a preparation course 1, this preparation is a modification of the exhaust port by increasing the charts and improvement of the duct, it increases the cylinder performance. Improved bottom skirt is also included in the amendment. Allow a little extra time for this preparation!

This high engine fits the 50cc motorcycles équpées gearboxes from Euro1 and Euro2 DERBI:

BULTACO Astro Enduro 50cc
BULTACO Lobito 50cc supermoto

Derbi GPR 50 Nude before 2004 (EBS050)
Derbi GPR 50 Racing before 2004 (EBS050)
Derbi GPR 50R Replica year 2001-2004
Derbi GPR 50cc year 1998-2001
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 DRD R enduro before 2000 (tubular frame)
Derbi Senda DRD R enduro before 2004 (perimeter frame) Euro2
Derbi Senda SM before 2000 (tubular frame)
Derbi Senda SM before 2004 (perimeter frame) Euro 2
Derbi 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 SM X-Trem before 2000 (tubular frame)
Derbi Senda SM X-Trem before 2004 (perimeter frame) Euro 2

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GILERA RCR Euduro 50cc (tubular frame)
GILERA SMT SM 50cc (tubular frame)
GILERA Sioux Enduro 50cc
GILERA Zulu Enduro 50cc

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