INTRODUCTION
Thank you for choosing our engine the CORS-AIR M 25 Y. We invite
you to spend some time reading this manual, which will let you discover
all the features of your engine. Advices on maintenance and operation
will help you to have a reliable engine and to preserve your investment.
Furthermore, we invite you to deliver this manual together with the
engine if you sell it, so it can be useful for the next owner as well. The
manufacturer and the resellers are ready to answer your questions and,
if necessary, to solve every problem, because YOUR AND THE OTHER
PEOPLE’S SAFETY IS THE MOST IMPORTANT THING FOR US.
IDENTIFICATION OF THE OWNER
Owner
Address
Serial number
Reseller
Address
Owner’s signature
Reseller’s signature and stamp
Date of sale
The Company reserves the right to make technical and aesthetic changes without notice in order to improve the quality of the
product.
Cors-Air M25Y / Black Devil
TECHNICAL FEATURES
Cycle 2 strokes
Total displacement 172,5 c.c.
Bore 65 mm.
Stroke 52 mm.
Compression ratio
11:1
Peak rpm 7.500 rpm
Cooling by air
Piston of light alloy with 2 piston ring of cast iron S10 crominiumplated
Cylinder Nickasil Coated
lining
Head of die-casted light alloy with high percentage of silicon
Crankcase molten in alloy G –Al Si 9 UNI 3051
Connecting rod of steel 18 Ni Cr Mo 5 forged and
copper- plated with rolls fit for
high speed
Carburettor diaphragm
Feeding reed valve with 4 petals on the crankcase
Electronic ignition type CDI (electric version) type TCI (manual version)
Regulation of spark advance 18° at 7000
rpm
Spark plug NGK B9ES
Reduction with belt Poly-V from 1 to 2.2 to 1 to 2.6
Cylinder head temperature max 200°C
Fuel mixture of premium petrol 98 octane and oil at 2%
Oil synthetic top-quality oil for 2-strokes engines
Expenditure from 2,5 to 4,5 liter/hour depending from the load and the speed
Fixing to the frame 5 rubber antivibration mounts
Rotation counterclockwise in front of the propeller
MAIN TORQUES Kg.m (Nm)
DECOMPRESSOR (only hand start version) 2,0 20
NUTS TO FIX THE HEAD 2,2 22
NUTS TO FIX HALF-CRANKCASE 2,5 25
BOLTS TO FIX THE BACK FLANGE TO THE CRANKCASE 2,0 20
NUTS TO FIX THE PINION TO THE FRONT PART OF THE DRIVE SHAFT 4,5 45
NUTS TO FIX BACK PART OF DRIVE SHAFT TO IGNITION HANDWHEEL (manual version) 3,5 35
NUTS TO FIX BACK PART OF DRIVE SHAFT TO IGNITION HANDWHEEL (electric version) 1,2 12
GAP BETWEEN COIL AND HANDWHEEL 0.4 mm
ASSEMBLY:
You can install the engine on the frame by using 4 rubber mounts of 40 mm
between the back flange and the engine mount. It is PEREMPTORY to install also
the 5th rubber mount (20x30), fixing it in the proper hole located under the
reduction flange, through an angular square. This device will permit to evenly
distribute the vibrations of the engine on every part of the frame.
To attach the propeller use only bolts of class 10/8 (100 Kg) and make sure that
their length is enough to exit from the reductor-pulley. Tighten the 6 bolts M8 in a
cross, at 1.5 Kg.m.(15Nm). Re-check the torque of the bolts after the first hour of
engine’s working.
We suggest not to use a variable pitch carbon prop, because the big hub pushes the
prop too forward, with possible damages to pulley and bearings.
For the connection between the carburetor and the fuel tank use a proper hose of
the right diameter (1,2 times the max. expenditure per hour, that means sending 11
liters/hour). The length of the fuel line must not be more than 80 cm.
It is advisable to install a manual primer bulb to get the fuel to the carburetor
before for starting. This device will allow the fuel to arrive to the carburettor,
protecting in this way the battery.
IMPORTANT NOTES
DO NOT try to start the engine without the propeller.
DO NOT start the engine with loose bolts or parts, since this can cause the
detaching of the propeller, the ovalization of the propeller holes, the damage of the
electric start and the breakage of the rubber mounts.
IMPORTANT! BEFORE FLYING CHECK ALWAYS EVERY PART OF YOUR
CRAFT, FROM ENGINE TO FRAME.
Verify that there are no damaged electric wires, that there are no leaks from hoses,
tank, carburettor or engine’s crankcase, that the propeller is not damaged or loose,
that the exhaust-pipe has no cracks, that the frame is not bent or broken because of
falls, that rubber mounts are not cracked, that the reduction belt is not loose and
every bolt is tight. Finally you can start the engine, leaving it to warm up at a speed
of 2.200 to 2.700 rpm with head temperature at least 120 °C.
FUEL
Use for the mixture only premium gas for cars 98 octane, together with goodquality, synthetic oil for mixtures at a quantity of 2% .(DO NOT USE MIXTURE
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