The engine is then started in the usual manner and, when running, the igniter is changed to running position, and the magneto is tilted outwardly. It is not important which is changed first, the magneto or the igniter. It is easy to remember the “starting” and running “position” of the magneto, the running position always being that in which the magnetos are tilted in the direction opposite to that in which the engine runs. (99) Care of Low Tension Magnetos. (1) Avoid setting a magneto on an iron or steel plate, unless stated otherwise in the manufacturer’s directions, as in some makes the magnetism will be short circuit by iron or steel and will reduce the output. (2) Do not jar magnets or magneto unnecessarily, for this tends to weaken the magnets. (3) Never remove the magnets if it can possibly be avoided. If this must be done, mark the magnets and gears so that they may be replaced in exactly the same position. If your magneto refuses to generate after reassembling it is probable that they are reversed in position or that the magnetism has been knocked out of them while off of the magneto. (4) As soon as the magnets are removed, or better before, place a plate of iron or steel across both ends of the magnet. Don’t leave the magnets without this keeper for any length of time or they will lose their magnetism. The best plan is to leave the magnets alone. (5) Remember that the running clearance between the magnets and armature is very small, only a few thousandths of an inch, and that any error in replacing the bearings in their proper position will cause the armature to bind in the tunnel. Handle armature carefully and do not lay it in a dirty place as a bent shaft or grit in the armature tunnel will fix it permanently. (6) Most all magnetos are practically water proof, but don’t experiment with the hose. (7) Make all connections firmly and have the wire clean under the binding posts. (8) Only a few drops of oil are needed at long intervals, don’t neglect to oil them, but above all do not drown them with oil. (9) Examine the brush occasionally and clean off all oil and dirt. (10) When replacing the magneto on the engine after its removal see that the gears are meshed in the former position. Best to mark the teeth before removal. (100) High Tension Magnetos. The “true” high tension type magneto is complete in itself, requiring no jump spark coil nor timer, the high tension current being generated directly in the coils carried by the armature. This arrangement reduces the wiring problem to a minimum, as the only wires required are those leading directly to the spark plugs, and one low tension wire connecting the cutout switch used for stopping the engine. [Illustration: Fig. 105. Single Cylinder High Tension Bosch Magneto. ]