§ Kit 77cc Ø50mm MALOSSI MHR BIG BORE aluminum (axis of 12mm) minarelli horizontal liquid (nitro, aerox ...)

The famous big bore kit MALOSSI MHR! A monster of power and competition technicalities. This kit is provided for the original stroke (39,2mm) with an original size rod (80mm) in axis of Ø12mm piston.

With its diameter of 50mm offers 77cc real, to pass the cylinder that has a wide skirt for strength, you need to machine the motor casings as follows:

The cylinder has an insertion diameter in the crankcase 56.2 -0.1 / -0.2 mm. So it is necessary to ream the casing with a boring bar of 56,7 + 0,0 / 0,1 mm to a depth of 21 mm.

MHR pulled out all the stops, a magnificent polished tapered cylinder head stud that even aesthetically is beautiful with its brands put on the 3D plot. The alloy and the treatment used are of the highest quality, really strong, so it is ideal for the preparation / finish unlike nykasil SIMONINI that it separates easily and is rather fragile.

Its 50mm diameter piston is reinforced and made ​​of aluminum base has high silicon content, processing money, slightly prepared on the rear for better filling / scan, this piston is equipped with a reinforced cast iron segment KDN5 0.8mm of curved chrome thickness. The cylinder offers 7 transfers and enormous exhaust has bar, the finish is excellent for a price so low on this type of cylinder. The architecture is beautiful and transfers really studied the best.

The kit is obviously comes with reinforced needle cage reinforced studs, several base gaskets to adjust your squish as it should. This kit has huge diagrams, 196 ° for the exhaust which is bar, 130.5 ° for admission which is otherwise transfers 7! With a compression ratio of 1: 50.50 (squish 0.50mm) is a real missile performance.

MALOSSI MHR suite has its trials announced this stock kit (unprepared) 26cv has 13,800 rev / min. Both say that most shares of other kit has had a stand tiles. Malossi released this performance with a 28mm carburetor VHST, ignition MALOSSI MHR SELLETTRA yellow, a big bore exhaust MHR, an airbox RIDOLPHI, the MHR valves ...

A full set by professional scooter. So you can expect to achieve with complete equipment easily 24 cv real! You will understand, this kit is the most powerful of the market in normal course and its assembly / adjustment will ask you a lot of material, knowledge and a big budget. There faudrat you ask a crankshaft worthy of the name! We advise MALOSSI MHR RHQ and POLINI evolution 2.

Technical Features:

Reference: 3113036

Cooling: H2O (liquid)

Power: 13.800 rpm 26 hp

Power couple: rpm 13,500 13.5 kgm

Number of transfers: 7 T + exhaust has bar

Material: Aluminum nykasil

Diameter: 50mm

Scheduled to run: 39,2mm (original)

Scheduled for rod: 80mm (origin)

Recommended Squish: 0,50mm

Cc: 77cc

Advance has advised the ignition: 16 °

Recommended compression ratio: 1: 15.50

Recommended ignition: malossi mhr sellettra yellow

Recommended Carburetor: Dellorto 28mm VHST

Recommended plug: W34ES-ZU

Exhaust diagrams: 196 °

Admission diagrams: 130.5 °

Capacity of the combustion chamber 5.3 cm3

Description malossi MHR:

BIG BORE Ø 50

The new thermal groups BIG BORE Ø 50, stroke 39.2 - 39.3 and 44, studied for Minarelli and Piaggio engines took the form of famous thermal technology group with 7 transfers MHR Malossi Scooter Trofeo.
All drivers, enthusiasts for novelty, wanted to test them. The results are not long in coming: the increase in power and complete reliability showed, for the umpteenth time, product quality and professionalism of the Malossi.

Technical characteristics:
- Cylinder 7 transfers, H2O, gravity melted alloy hardened aluminum jacket with lining Cermetal, lévigé with diamond tools
- Bore 50
- Piston mono segment reinforced domed head
- Segment Ø 50 x 0.8 cast KDN5
- Cylinder decomposable alloy of primary aluminum, hardened, equipped with routing system cooling system calculated and oriented.

You will need to provide as a minimum: big carburetor kit 26mm minimum, extremely reinforced crankshaft ultra reinforced bearings, exhaust racing adapted to kit diagrams (MHR BIG BORE, 2 fast, CHRISOFOLINI) ignition racing internal rotor, machining housings and preparation for mandatory alignment ... We still regret that the segment junction passes in front of the rear center transfer as this create premature wear!

The pack contains:

4 studs

pack of manifold gaskets of different thicknesses to squish

yoke stud

cylinder head cover

pack complete joint

Reinforced needle cage

reinforced piston D.50mm

piston pin reinforced d.12mm

piston clips reinforced C

segment reinforced hard chrome D.50mm 0.8mm thickness

aluminum cylinder exhaust 7 bar transfers r 0, D.50mm

Cylinder head screws

maintenance booklet / assembly / manual

Spare parts:

piston

segment

complete breech

cylinder head cover

yoke stud

needle cage

piston clips

piston pin

pack attached

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!