Cylinder -MALOSSI 136 cc MHR Alloy- Vespa PV125, ET3 125, PK125

Preview: Cylinder -MALOSSI 136 cc MHR Alloy- Vespa PV125, ET3 125, PK125

Description

With the 136cc MHR, Malossi launches a completely new version of the popular smallframe cylinder for PV, ET3, PK125, ETS. With significantly larger channels, a much more modern flushing system and made of coated aluminium, it provides good conditions for lasting top performance.

The cylinder can be operated either as a housing suction device (rotary vane or diaphragm) or, by means of an optionally available diaphragm suction port, as a direct suction device.

Aluminium cylinder with coated raceway
centred cylinder head with O-ring seal
new piston type with one piston ring
larger inlet
three-part outlet
modified overflow channels

Thanks to the now used aluminium material and hard chrome coating, the cylinder is also thermally resistant to higher performance requirements. The inlet area and the volume of the overflow channels as well as the intake area has grown significantly.

Malossi gives a geometric compression ratio of 12.5:1 for the MHR.
The combustion chamber is offset by 0.6mm from the cylinder head sealing surface. Also with the MHR a perfect sealing to the combustion chamber is guaranteed by a 1,75mm thick O-ring and centered very cleanly over the cylinder bore by 4 points. Besides the channel cross sections Malossi also did something to the control angles. With an assumed piston clearance of 1mm, the MHR with 51mm stroke offers with 124° to 179° already quite sporty steering angles.

The resulting forward exhaust of 27,5° and the larger surface by the side outlets, also appeals to performance-oriented exhaust systems. With an outlet diameter of 28mm and a stud spacing of 56mm, many common sporty exhaust systems fit.

With the press presentation Malossi advertises the new MHR for the Vespa, depending on the exhaust system, with a performance of 18-25HP. We see the MAlossi MHR 136 as the perfect entry for a sporty oriented engine. Without any further machining the cylinder already delivers good power and torque values which, due to further components and machining, still allow a lot of air to rise.

details at a glance

piston

new type with stable piston shirt
one piston ring 1mm
181,5gr

cylinder

aluminium with hard chrome coating
overflow channels "MHR"
larger inlet area
bore 57,5mm
stroke 51mm
conrod 97mm
three outlet channels
outlet Ø 28mm
stud distance outlet 56mm / M8
stud distance inlet 65mm / M6
cylinder base gasket 0,5mm
control angle 124° / 179° (41mm/ 30mm)

cylinder head

centering over 4 points
O-ring seal 1.75mm
CNC machined combustion chamber
compression ratio 12.5:1

accessories (included)

cover for direct inlet
gaskets for direct and housing inlet
stud bolts for inlet and outlet
gasket set cylinder, O-ring 1.75mm, foot seal 0.5mm

NOTES:

Due to the larger overcurrent channels, the motor housing must be adapted according to the enclosed Malossi instructions.
The stable rectangular ring should be installed with the inscription facing the piston top.

BITTEN NOTE: The frame cut-out in the area of the intake port may have to be modified/extended

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€428.00 *

incl. VAT plus shipping costs

Available immediately (delivery time 1-3 working days*)

P For this item you get fidelity point/s

General
performance class:	racing, sport
Gudgeon pins
diameter:	15 mm
Spark plugs
thread type:	M14x1,25
thread spark plug:	short
heat rating NGK:	B9HS
Cylinders
displacement:	132 cm³
bore:	57.5 mm
engine type:	2-stroke
type of cooling:	air cooled
material:	aluminium
material piston cylinder surface:	Ceramic
cylinder head inclusive:
cylinder gasket set inclusive:
number of transfers (incl.boost ports):	6
number of boost ports:	2
shape exhaust port:	triple port
exhaust mounting:	flange
flange type:	2 studs
exhaust bolt pitch:	56 mm
thread exhaust studs:	M8
Crankshafts
stroke:	51 mm
Pistons
number of piston rings:	1
production method piston:	cast
Piston rings
piston ring type:	common ring
thickness rings:	1,0mm
Circlips
circlip type:	C-type
wire size of circlip:	1,0mm
Cylinder heads
cylinder head type:	one piece
OEM numbers (for comparison purposes only)
Malossi	M3115829, 3115829

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