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WHAT MAKES THE ENGINE RUN. The power of a gasoline engine is furnished by an explosion of gas inside the cylinder. This gas is made from gasoline and air drawn in through the mixing valve by the suction of the piston. To ignite this gas an electric spark is furnished by a battery or a magneto. To get the most power from the engine the explosion should take place when the piston reaches the end of the compression stroke or is in the cylinder as far as it will go, so the piston will be pushed out of the cylinder with the full force of the explosion. To get this condition, it is necessary that the electric spark takes place at just the right time. WHEN THE SPARK SHOULD TAKE PLACE. So you can tell just where the spark should take place to give the best results we have stamped the word Spark on the rim of the fly wheel. The spark in the cylinder should take place just as this word Spark on the fly wheel is opposite the top of the cam rod, as shown in Figure 5. Turn the fly wheels around slowly by hand to the right and stop instantly when you hear the igniter snap. If the top of the cam rod is directly opposite the word Spark on the fly wheel, then the spark takes place at the right time in the cylinder. If the word Spark is below the top of the cam rod, then the spark takes place too soon; if the word Spark has passed the top of the cam rod, then the spark is taking place too late. To change the time of the spark, loosen the locknut "A,"
Figure 3, page 7, changing the adjusting screw "B." To
advance the spark, turn this screw to the right; to retard the spark turn it to the left.
After you have the trip set so that it brings the spark at the right time, tighten the
locknut "A." Then turn the fly wheels around again and see if the igniter snaps
at the right time, as in tightening, down the locknut it sometimes changes the time the
spark takes place. |
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