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A mobile observation stand assembly includes a platform that may be in a lowered position for transport and an elevated position for use in a desired location. The assembly includes a base supported by a wheel and axle assembly, with an articulated anterior frame and an articulated posterior frame a

A mobile observation stand assembly includes a platform that may be in a lowered position for transport and an elevated position for use in a desired location. The assembly includes a base supported by a wheel and axle assembly, with an articulated anterior frame and an articulated posterior frame attached to the base. The posterior and anterior frames each include a basal frame and a principal frame that are jointed by a rollover lock joint that allows for pivotal movement. A leveraging cam is attached to the posterior frame, with the cam supporting the anterior frame during repositioning of the assembly.

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A mobile observation stand assembly includes a platform that may be in a lowered position for transport and an elevated position for use in a desired location. The assembly includes a base supported by a wheel and axle assembly, with an articulated anterior frame and an articulated posterior frame a

A mobile observation stand assembly includes a platform that may be in a lowered position for transport and an elevated position for use in a desired location. The assembly includes a base supported by a wheel and axle assembly, with an articulated anterior frame and an articulated posterior frame attached to the base. The posterior and anterior frames each include a basal frame and a principal frame that are jointed by a rollover lock joint that allows for pivotal movement. A leveraging cam is attached to the posterior frame, with the cam supporting the anterior frame during repositioning of the assembly. sition detecting washer. 6. The engine of claim 1 further comprising a flywheel mounted to said crankshaft and said drive pulley being mounted between said flywheel and said engine case. 7. An engine comprising an engine case, a generally vertically extending crankshaft journalled for rotation within said engine case, a bearing supporting a portion of said crankshaft within said engine case, said crankshaft having an upper end extending beyond said engine case, said upper end of said crankshaft defining a first diameter and a second diameter, a face surface being defined at a transition between said first diameter and said second diameter, a drive pulley mounted to said crankshaft, and a plurality of fasteners, each comprising an external thread and extending into said face surface to affix said drive pulley to said face surface. 8. The engine of claim 7 further comprising a position detector mounted to said crankshaft. 9. The engine of claim 8, wherein said position detector comprises a position detecting washer. 10. The engine of claim 7 further comprising a pin that is interposed between said drive pulley and said crankshaft. 11. The engine of claim 10, wherein said pin extends into said face surface. 12. The engine of claim 7 further comprising a flywheel magneto that is disposed vertically above said drive pulley. 13. The engine of claim 12, wherein said flywheel magneto comprises a rotor and a stator, and said at least one fastener and said drive pulley are disposed generally below said stator. 14. The engine of claim 7, wherein said first diameter extends at least from said bearing to an outer edge of said face surface. 15. The engine of claim 1, wherein each one of said plurality of fasteners has a center axis that extends generally parallel to said rotational axis. 16. An engine comprising an engine case, a crankshaft being journalled for rotation within the engine case, the crankshaft having an end portion extending beyond the engine case, the end portion having a first diameter and a second diameter together defining a step area therebetween, the step area extending generally normal to a rotational axis of the crankshaft and having at least one blind hole extending generally parallel to and offset from the rotational axis of the crankshaft, a drive pulley abutting on the step area and extending coaxially with the crankshaft, and at least one threaded fastener extending downward through the drive pulley to terminate within the blind hole. 17. The engine of claim 16 additionally comprising a washer interposed between the step area and the drive pulley, and the washer defining a portion of a position detector that detects an angular position of the crankshaft. 18. The engine of claim 16 additionally comprising a flywheel magneto disposed opposite from the step area relative to the drive pulley. 19. The engine of claim 16, wherein the engine comprises a plurality of the fasteners. ector (20) of fuel jet nappe angle (a1), a cylinder (10), a cylinder head (12), a piston (18) sliding in this cylinder and connected to a crankshaft, and a combustion chamber delimited by wall (26) of the cylinder, cylinder head (12) and upper face (24) of piston (18), characterised in that it consists in: determining a lower limit position (PL) of piston (18) below which wall (26) of the cylinder is likely to be wetted by the fuel jets from the injector, determining the effective position of this piston, locating this effective position of the piston in relation to the lower limit position, adjusting the fuel injection parameters according to the effective position of the piston in relation to the lower limit position. 2. A method as claimed in claim 1, characterised in that it consists in adjusting injection parameters so as to limit the penetration of fuel jets in the combustion chamber for any position of piston (18) between its lower limit position (PL) and its furthest position from cylinder head (12). 3. A method as claimed in claim 2, characterised in that it consists in injecting a determined amount of fuel under very high pressure. 4. A method as claimed in claim 3, characterised in that it consists in injecting a determined amount of fuel under a pressure above 1000 bars. 5. A method as claimed in claim 2, characterised in that it consists in injecting a determined amount of fuel for a very short length of time. 6. A method as claimed in claim 3, characterised in that it consists in repeating the injection of a determined amount of fuel until the total amount of fuel to be injected is obtained. 7. A method as claimed in claim 3, characterised in that it consists in injecting a determined amount that does not exceed 25% of the total amount of fuel to be injected. 8. A method as claimed in claim 1, characterised in that it consists in determining the lower limit position (PL) of the piston by means of the relation D×tan(a1/2), where D is the radial distance between the point of origin O of the fuel jets and wall (26) of cylinder (10). 9. A method as claimed in claim 1, characterised in that it consists in using injection parameters to inject the fuel in a conventional way for any position of piston (18) between its lower limit position (PL) and its closest position to cylinder head (12).