Technical data General Engine designation MD2010 MD2020 MD2030 M D2040 Number of cylinders 2 3 3 3 Cylinder diameter 67 mm 67 mm 75 mm 84 mm (2.637 in) (2.637 in) (2.952 in) (3.307 in) Stroke length 64 mm 64 mm 72 mm 90 mm (2.519 in) (2.519 in) (2.834 in) (3.543 in) Swept volume, total 0.45 litres (27.46 cu.in ) 0.68 litres (41.49 cu.in ) 0.95 litres (57.97 cu.in ) 1.50 litres (91.53 cu.in ) Power, see sales literature I dling speed 850 ±25 rpm 850 ±25 rpm 850 ±25 rpm 850 ±25 rpm Deregulation speed/high idling 3900 ±25 rpm 3900 ±25 rpm 3900 ±25 rpm 3900 ±25 rpm Compression ratio 23.5:1 23.5:1 23:1 22:1 Compression pressure with starter motor speed >3000 kPa >3000 kPa >3000 kPa >3000 kPa (>435 psi) (>435 psi) (>435 psi) (>435 psi) Firing order (cyl.
No. 2 and 3 closest to flywheel) 1-2 1-2-3 1-2-3 1-2-3 Direction of rotation see from front Clockwise Clockwise Clockwise Clockwise Max. permissible angle backwards during operation 20° 20 0 20 0 20° Max. side angle during operation 30° 30° 30° 30° Valve clearance, idle cold engine: i nlet and outlet 0.20 mm 0.20 mm 0.20 mm 0.20 mm (.0078 in) (.0078 in) (.0078 in) (.0078 in) Weight, engine without oil and water 98 kg 116 kg 129 kg 179 kg (215.9lb) (255.5lb) (284.2lb) (394.3 Ib) Max. permissible counter pressure in exhaust pipe..
20 kPa (2.9 psi) 20 kPa (2.9 psi) 20 kPa (2.9 psi) 20 kPa (2.9 psi) Pistons MD2010 M D2030 M D2040 M D2020 Material Height, total in mm Aluminium alloy 59.045-59.095 Aluminium alloy 65.575-65.625 Aluminium alloy 87.66-87.74 (2.324-2.326 in) (2.581-2.583 in) (3.451-3.454 in) Height from gudgeon pin centre to piston top in mm 33.045-33.095 35.575-35.625 47.66-47.74 (1.300-1.302 in) (1.400-1.402 in) (1.876-1.879 in) Piston clearance in mm: 0.048-0.082 0.0425-0.0665 0.038-0.072 (.0018-.0032 in) (.0016-.0026 in) (.0014-.0028 in) Front marking*, MD2010 , MD2020 MD2030 , MD2040 The arrow alt.
"F" mark on piston top should be turned forwards The "SHIBAURA" mark in the piston should be turned forwards * The pistons for certain engines also have an arrow in front of the gudgeon pin hole which should point forwards. Piston rings MD2010 M D2020 M D2030 M D2040 Compression rings: Number 2 2 2 Top compression ring, height in mm 1.47-1.49 1.47-1.49 1.97-1.99 (0578-.0586 in) (.0578-.0586 in) (.0775-.0783 in) 2nd compression ring, height in mm 1.47-1.49 1.97-1.99 1.47-1.49 (.0578-.0586 in) (.0775-.0783 in) (.0578-.0586 in) Oil ring: Number 1 1 1 Height in mm 2.97-2.99 3.97-3.99 3.90-3.98 (.01169-1177 in) (.01562-.1570 in) (.1535-.1566 in) 9