USER’S MANUAL ENGINE M 21 Y
Distributed by: JPX ITALIA Via Flli. Cervi n°3 42025 Cavriago (Reggio Emilia) Italy
Phone (39) 0522-371682 Phone/Fax :(39) 0522-372875 Mob. 333-4563008 www.jpxitalia.com
INTRODUCTION Thank you for choosing our engine CORS-AIR M 21 Y. Herewith we invite you to spend some time reading this manual, which will let you discover all the featuresof your engine. Advices on maintenance and recurrence of controls will help you to have an always reliable engine and to preserve your investment. We invite you furthermore to deliver this manual together with the engine if you sell it; this will be useful to the next owner, too. The manufacturer and the resellers are ready to answer your questions and, if necessary, to solve every problem, becauseYOUR 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.
TECHNICAL FEATURES Engine M 21 Cycle 2strokes Power 21 hp at 7200 rpm Total displacement 172,5 c.c. Bore 65 mm. Stroke 52 mm. Compression ratio 11:1 Peak rpm 7.400 rpm Cooling by air Piston of light alloy with 2 piston ring of cast iron S10 chrominiumplated Cylinder of silicon light alloy with surfacing of Cermetal Head of die-casted light alloy with high percentage of silicon Crankcase molten in alloy G –Al Si 9 UNI 3051 Connecting rod ofsteel 18 Ni Cr Mo 5 forged and copperplated with rolls fit for high speed Carburettor Walbro WB 32 Feeding reed valve with 4 petals on the crankcase Electronic ignition type CDI with double spark per round with battery recharge included Generated current at 6.000 rpm 85 Watt 6,6 Amp. Regulation of spark lead 18° at 7000 rpm Spark plugs NGK B8ES (for normal or hot climate) B7ES (for cold climate)Reductor with belt Poly-V from 1 to 1.9 to 1 to 2.6 Continuous normal temperature not over 200°C Fuel mixture of premium petrol 98 octane and oil running-in and with hot climate, 2% normally 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 infront of the propeller MAIN TORQUES
NUTS TO FIX THE HEAD NUTS TO FIX HALF-CRANKCASE BOLTS TO FIX THE REDUCTOR FLANGE TO THE CRANKCASE BOLTS TO FIX THE BACK FLANGE TO THE CRANKCASE NUTS TO FIX THE FRONT PART OF THE DRIVE SHAFT TO THE PINION NUTS TO FIX BACK PART OF DRIVE SHAFT TO IGNITION HANDWHEEL
1,8 2 2 2 4 3,5
18 20 20 20 40 35
ASSEMBLY: You can fix the engine on the frameby interposing 4 rubber mounts of O 40 mm between the back flange and the engine mount. It is necessary to install also the 5th rubber mount, fixing it in the proper hole located under the reduction flange, through an angular square. This device will permit to distribute homogeneously the vibrations of the engine on every part of the frame. To fix the propeller use only bolts of class 10/8 (100Kg) 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 tightening of the bolts after the first hour of engine’s working. For the connection between the carburettor and the fuel tank use a proper linen pipe of the right section (1,2 times the max. expenditure per hour, that means sending 11 liters/hour). Thelength of the pipe must not be more than 80 cm. It is advisable to install a manual pump to let the fuel arrive before the start of the engine. This device will avoid the protraction of the switching on to let the mixture arrive to the carburettor, protecting this way the battery. IMPORTANT NOTES DO NOT try to start the engine without the propeller. DO NOT make the engine work with loose bolts,...